Sand mixing system for 3D printing equipment

Abstract

The utility model provides a sand mixing system for 3D printing equipment. The sand mixing system comprises a 3D printer and a rack, a vibrating screen, a sand mixer, a sand metering device and a sand bin device are sequentially mounted on the rack above the 3D printer from bottom to top; the sand bin device comprises a plurality of storage boxes; the sand metering device comprises a suspension frame, a weighing sensor and a metering hopper; the sand mixer comprises a housing, a stirring barrel and a stirrer; a hot air heating device and a stirring temperature sensor are arranged on the sand mixer, the stirring temperature sensor is arranged on the housing and extends into the stirring barrel, and the stirring temperature sensor is electrically connected with the hot air heating device so that the hot air heating device can heat materials in the stirring barrel by blowing hot air. According to the embodiment of the utility model, hot air is used for heating sand mixed in the stirring barrel, so that the sand reaches and keeps constant temperature, a part manufactured by feeding the constant-temperature sand into the 3D printer can meet the requirements of chromatic aberration, strength and precision, a constant-temperature workshop does not need to be arranged, the structure is simple, and the cost is low.

Description

Technical Field

[0001] The utility model belongs to the technical field of 3D printing, and in particular relates to a sand mixing system for 3D printing equipment. Background Art

[0002] In the existing technology, 3D printing technology faces many challenges, especially when using sand and admixtures for printing. These materials are susceptible to thermal deformation and shrinkage during the printing process, which may not only lead to printing failure, but also cause the manufactured parts to have color differences, insufficient strength and low manufacturing accuracy. In addition, the temperature of the sand and the temperature of the mixture, as well as the ratio accuracy of sand and admixtures, also have a significant impact on the quality of the final product.

[0003] To solve these problems, existing technologies have adopted technical means such as building a constant temperature workshop to reduce the impact of material temperature changes on the printing process, thereby improving product quality and the reliability of the printing process. However, these measures are too costly and it is difficult to accurately control the temperature of the material. Utility Model Content

[0004] In view of the deficiencies existing in the related technologies, the utility model provides a sand mixing system for 3D printing equipment to solve the problem that the current 3D printing equipment adopts the method of building a constant temperature workshop with high cost and difficulty in accurately controlling the material temperature.

[0005] The utility model provides a sand mixing system for 3D printing equipment, comprising a 3D printer and a frame;

[0006] The bottom of the frame is provided with a first installation space, the 3D printer is located in the first installation space, and the top of the 3D printer is provided with a printer feed port;

[0007] The frame above the 3D printer is equipped with a vibrating screen, a sand mixer, a sand metering device and a sand storage device from bottom to top;

[0008] The sand storage device is a plurality of storage boxes arranged side by side, each of which has a storage outlet at the bottom, and a storage valve is installed on the storage outlet to open or close the storage outlet;

[0009] The sand metering device includes a suspension, a weighing sensor and a metering hopper. The suspension is installed on the frame. The metering hopper is suspended on the suspension through the weighing sensor so that the weighing sensor weighs the material in the metering hopper. The top of the metering hopper is open, and the material storage outlets are located directly above the metering hopper so that the material discharged from the storage box through the material storage outlet falls into the metering hopper. A metering valve is installed on the metering outlet opened at the bottom of the metering hopper to open or close the metering outlet.

[0010] The sand mixer includes a housing, a mixing barrel and an agitator. The housing has a material guide pipe at the bottom, which is fixed on a support frame provided on the frame. The mixing barrel is installed in the housing, and a driving motor of the agitator is installed outside the housing. A stirring paddle of the agitator is located in the mixing barrel, and the stirring paddle passes through the housing upward and is connected to the driving motor. The top of the mixing barrel is open, and a feeding pipe is provided on the top of the housing. The port of the feeding pipe is located directly below the metering outlet, so that the material discharged from the metering hopper through the metering outlet enters the housing through the feeding pipe and falls into the mixing barrel. The mixing barrel is provided with a discharge door, which is used to open or close the mixing discharge port provided at the bottom of the mixing barrel.

[0011] The vibrating screen is installed on the support frame, and the top and bottom ends thereof are respectively provided with a vibrating screen feed port and a vibrating screen discharge port. The vibrating screen feed port is located directly below the bottom end port of the guide tube, and the vibrating screen discharge port is located directly above the printer feed port.

[0012] The sand mixer is equipped with a hot air heating device and a stirring temperature sensor. The stirring temperature sensor is installed on the cover and extends into the stirring barrel. The stirring temperature sensor is electrically connected to the hot air heating device so that the hot air heating device heats the material in the stirring barrel by blowing hot air.

[0013] In some of these embodiments, further comprising a liquid heater;

[0014] A heating pipe is arranged in the wall of the material storage box, and the heating pipe surrounds the inner space of the material storage box and is spiral from top to bottom;

[0015] The liquid heater comprises a liquid storage tank and a heating wire for heating the liquid in the liquid storage tank. The heat outlet of the liquid storage tank is connected to one end of a heating pipe through a circulation pump, and the other end of the heating pipe is connected to a liquid return port of the liquid storage tank.

[0016] In some of the embodiments, a heat-insulating layer is attached to the outer wall of the storage box.

[0017] In some of the embodiments, the bottom of the box wall outside the storage box is inclined so that the bottom of the internal space of the storage box is funnel-shaped.

[0018] In some of the embodiments, both the storage box and the metering hopper are equipped with vibrators.

[0019] In some embodiments, the hot air heating device includes a heating box, which has an air inlet and an air outlet at both ends. The heating box is installed on the cover, and the air outlet is connected to the heating air outlet opened on the side wall of the cover. A hot air blower is installed in the heating box.

[0020] In some of the embodiments, the top plate of the cover is attached to the opening at the top of the mixing barrel to close it.

[0021] In some of the embodiments, a pulse back-blowing dust collector is installed on the dust removal port arranged at the top of the cover shell, and the dust removal port is connected to the inner space of the mixing barrel.

[0022] In some of the embodiments, an additive adding device is further included, and the additive adding device includes an additive tank, an additive delivery pump and an additive delivery pipe;

[0023] The additive box is installed on the frame and is located below the vibrating screen;

[0024] One end of the additional delivery pipe is connected to the additive material box, and the other end is connected to the cover shell. The additional delivery pump is installed on the additional delivery pipe to deliver the additive in the additive material box to the mixing barrel in the cover shell through the additional delivery pipe.

[0025] In some of the embodiments, an electrical control cabinet is further included, and the material storage valve, the metering valve, the agitator, the discharge door and the hot air heating device are all electrically connected to the electrical control cabinet;

[0026] A material level meter and a material storage temperature sensor are installed in the material storage box, and the material level meter, the material storage temperature sensor and the weighing sensor are all electrically connected to the electrical control cabinet.

[0027] Based on the above technical scheme, in the embodiment of the utility model, different types of sand materials in each storage box are sequentially put into the metering hopper of the sand metering device, and the ratio of various sand materials is controlled by weighing, and then mixed and stirred by a sand mixer, and then sent to a vibrating screen for screening, and finally put into a 3D printer for 3D printing. In the process of mixing various sands in the sand mixer, the hot air heating device blows hot air into the cover of the sand mixer, so that the hot air heats the mixed sand in the mixing barrel, so that the sand material reaches and maintains a constant temperature. After the constant temperature sand material is put into the 3D printer, the components manufactured can meet the requirements of color difference, strength and precision, and there is no need to set up a constant temperature workshop, with a simple structure and low cost. The sand material in the barrel is directly heated by hot air, and the temperature of the sand material is monitored in real time by a discharge temperature sensor, and the hot air heating device is controlled accordingly. The heat transfer efficiency is high, the temperature of the sand material changes quickly, and the temperature of the sand material can be more accurately controlled at the required temperature, which solves the problem that the current 3D printing equipment adopts the method of building a constant temperature workshop with high cost and difficult to accurately control the material temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0029] Figure 1 This is a schematic diagram of the structure of the sand mixing system for the 3D printing equipment of the utility model;

[0030] Figure 2 This is a structural schematic diagram of a sand storage device in a sand mixing system for a 3D printing device of the utility model;

[0031] Figure 3 This is a schematic diagram of the structure of the sand metering device in the sand mixing system for 3D printing equipment of the utility model.

[0032] In the figure:

[0033] 1. 3D printer; 2. rack; 21. support frame; 3. vibrating screen; 31. vibrating screen feed port; 32. vibrating screen discharge port;

[0034] 4. Sand mixer; 41. Cover; 42. Agitator; 43. Material guide pipe; 44. Feed pipe; 45. Agitating temperature sensor;

[0035] 5. Sand metering device; 51. Suspension; 52. Weighing sensor; 53. Measuring hopper; 54. Measuring outlet; 55. Measuring valve;

[0036] 6. Sand storage device; 61. Storage box; 62. Storage outlet; 63. Storage valve; 64. Heating pipe; 65. Insulation layer; 66. Material level meter; 67. Storage temperature sensor;

[0037] 7. Hot air heating device; 8. Vibrator; 9. Pulse back-blowing dust collector;

[0038] 10. Additive adding device; 101. Additive material box; 102. Additive delivery pump; 103. Additive delivery pipe; 20. Electrical control cabinet. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] like Figures 1 to 3 As shown, in an illustrative embodiment of the sand mixing system for 3D printing equipment of the utility model, the sand mixing system for 3D printing equipment includes a 3D printer 1 and a frame 2.

[0044] The bottom of the frame 2 has a first installation space, the 3D printer 1 is located in the first installation space, and the top of the 3D printer 1 has a printer feed port.

[0045] A vibrating screen 3, a sand mixer 4, a sand metering device 5 and a sand storage device 6 are installed on the frame 2 above the 3D printer 1 in order from bottom to top.

[0046] The sand storage device 6 is a plurality of storage boxes 61 arranged side by side. The bottom of each storage box 61 has a storage outlet 62 . Each storage outlet 62 is provided with a storage valve 63 for opening or closing the storage outlet 62 .

[0047] The sand metering device 5 includes a suspension 51, a weighing sensor 52 and a weighing hopper 53. The suspension 51 is installed on the frame 2. The weighing hopper 53 is suspended on the suspension 51 through the weighing sensor 52, so that the weighing sensor 52 can weigh the material in the weighing hopper 53. The top of the weighing hopper 53 is open, and the storage outlet 62 is located directly above the metering hopper 53, so that the material discharged from the storage box 61 through the storage outlet 62 can fall into the metering hopper 53. A metering valve 55 is installed on the metering outlet 54 opened at the bottom of the metering hopper 53 to open or close the metering outlet 54.

[0048] The sand mixer 4 includes a cover shell 41, a mixing barrel and an agitator 42. A material guide pipe 43 is provided at the bottom of the cover shell 41, and the material guide pipe 43 is fixed on the support frame 21 provided on the frame 2. The mixing barrel is installed in the cover shell 41, and the driving motor of the agitator 42 is installed on the outside of the cover shell 41. The stirring paddle of the agitator 42 is located in the mixing barrel, and the stirring paddle passes through the cover shell 41 upward and is connected to the driving motor. The top of the mixing barrel is open, and a feed pipe 44 is provided at the top of the cover shell 41. The port of the feed pipe 44 is located directly below the metering outlet 54, so that the material discharged from the metering hopper 53 through the metering outlet 54 enters the cover shell 41 through the feed pipe 44 and falls into the mixing barrel. The mixing barrel is provided with a discharge door to open or close the mixing discharge port provided at the bottom of the mixing barrel.

[0049] The vibrating screen 3 is mounted on the support frame 21, and a vibrating screen feed port 31 and a vibrating screen discharge port 32 are respectively provided at the top and bottom ends thereof. The vibrating screen feed port 31 is located directly below the bottom end of the guide tube 43, and the vibrating screen discharge port 32 is located directly above the printer feed port.

[0050] The sand mixer 4 is provided with a hot air heating device 7 and a stirring temperature sensor 45. The stirring temperature sensor 45 is provided on the cover 41 and extends into the stirring barrel. The stirring temperature sensor 45 is electrically connected to the hot air heating device 7 so that the hot air heating device 7 heats the material in the stirring barrel by blowing hot air.

[0051] Various sand materials are stored in each storage box 61 in the sand storage device 6. The storage valve 63 of the first storage box 61 is opened to discharge the sand materials therein through the storage outlet 62 and drop into the metering hopper 53. The weighing sensor 52 measures the weight of the sand materials in the metering hopper 53 in real time. When the weight reaches the set value, the storage valve 63 of the first storage box 61 is closed, thereby closing its outlet to stop the discharge of sand materials. The storage valve 63 of the second storage box 61 is opened to allow the sand materials therein to drop into the metering hopper 53 until the weighing sensor 52 detects that the weight change has reached the set value, and then the storage valve 63 of the second storage box 61 is closed.

[0052] According to the above method, the sand materials in the storage box 61 are put into the measuring hopper 53 one by one, and the mixed sand materials are prepared in the measuring hopper 53. At the same time, the weight of each sand material is determined according to the change of the weight of the sand materials in the measuring hopper 53, so as to control the proportion of various sand materials in the measuring hopper 53.

[0053] The metering valve 55 is opened, thereby opening the metering outlet 54. The mixed sand in the metering hopper 53 is discharged and enters the cover 41 through the feed pipe 44 and falls into the mixing barrel. The agitator 42 starts to run, and the driving motor drives the stirring paddle to rotate so that the stirring paddle stirs the mixed sand. The airflow generated by the hot air heating device 7 blows the mixing barrel to heat the mixed sand until the stirring temperature sensor 45 measures that the temperature of the mixed sand reaches the set temperature.

[0054] After the mixed sand material is stirred and heated, the discharge door is opened, the mixed sand material is discharged from the mixing barrel, and discharged from the cover 41 through the guide pipe 43, and falls into the vibrating screen 3 through the vibrating screen feed port 31. The vibrating screen 3 screens the mixed sand material to remove lumps in the mixed sand material, and the remaining mixed sand material falls into the printer feed port through the vibrating screen discharge port 32, so that the 3D printer 1 uses the mixed sand material for 3D printing.

[0055] Since the volume of the metering hopper 53 is limited, when preparing the mixed sand material, one type of sand material can be put into the metering hopper 53 each time, and then the sand material is sent to the sand mixer 4, and then the second type of sand material is put into the metering hopper 53, and the second type of sand material is put into the sand mixer 4. Various sand materials are weighed one by one, and immediately sent to the sand mixer 4 after weighing. The various sand materials are mixed into mixed sand material in the sand mixer 4.

[0056] In the above exemplary embodiment, different types of sand materials in each storage box 61 in the sand mixing system for 3D printing equipment are sequentially put into the measuring hopper 53 of the sand metering device 5, and the proportion of various sand materials is controlled by weighing, and then mixed and stirred by the sand mixer 4, and then sent to the vibrating screen 3 for screening, and finally put into the 3D printer 1 for 3D printing. In the process of mixing various sands in the sand mixer 4, the hot air heating device 7 blows hot air into the housing 41 of the sand mixer 4, so that the hot air heats the mixed sand in the mixing barrel, so that the sand material reaches and maintains a constant temperature. After the constant temperature sand material is put into the 3D printer 1, the manufactured parts can meet the requirements of color difference, strength and precision, and there is no need to set up a constant temperature workshop. The structure is simple and the cost is low. Secondly, the sand material in the barrel is directly heated by hot air, and the temperature of the sand material is monitored in real time by the discharge temperature sensor, and the hot air heating device 7 is controlled accordingly. The heat transfer efficiency is high, the temperature of the sand material changes quickly, and the temperature of the sand material can be more accurately controlled at the required temperature. In addition, the hot air heating device 7 blows hot air into the cover shell 41, and then blows the mixing barrel to heat the sand inside it, which is subsequently discharged from the cover shell 41 through the material guide pipe 43, thereby heating the cover shell 41 and the material guide pipe 43, and providing an environment with the same temperature as the sand discharged through the unloading door and transported to the vibrating screen 3, so that the sand in transportation is kept at a constant temperature, avoiding quality problems in 3D printing caused by temperature drop during the sand transportation process, and solving the problem that the current 3D printing equipment adopts the method of building a constant temperature workshop with high cost and difficulty in accurately controlling the material temperature.

[0057] In some embodiments, a liquid heater is further included. A heating pipe 64 is provided in the wall of the storage box 61, and the heating pipe 64 surrounds the inner space of the storage box 61 and is spiral from top to bottom. The liquid heater has a liquid storage tank and a heating wire for heating the liquid in the liquid storage tank. The heat outlet of the liquid storage tank is connected to one end of the heating pipe 64 through a circulation pump, and the other end of the heating pipe 64 is connected to the liquid return port of the liquid storage tank.

[0058] The liquid storage tank contains a heat transfer liquid. After the heating wire heats the heat transfer liquid, it is pumped to the heating pipe 64 through a circulating pump. The heat transfer liquid transfers heat to the sand material in the storage box 61 in the heating pipe 64 to heat the sand material. The heat transfer liquid returns to the liquid storage tank through the return port and can be heated again and circulate. Since the heating pipe 64 is arranged in a spiral, it is fully distributed in the upper and lower directions and the circumferential direction of the storage box 61, and the sand material can be fully heated. The heating pipe 64 is arranged in the box wall, does not take up extra space, and can be closer to the sand material in the storage box 61, and the heating efficiency is high. The sand material in the storage box 61 is heated to achieve preheating of the sand material, so that it has a certain temperature when it enters the sand mixer 4, reducing the load of the hot air heating device 7, so that it does not need to heat the sand material from room temperature, and the sand material can be heated to the set temperature faster and more accurately.

[0059] In some embodiments, an insulation layer 65 is attached to the outer wall of the storage box 61. The insulation layer 65 keeps the preheated sand insulated, reducing the energy consumption of the liquid heater. In addition, the insulation layer 65 is only arranged on the outer wall of the box, so that the insulation layer 65 on each storage box 61 is located on the outer side, and the insulation layer 65 surrounds each storage box 61 on the inner side and the sand therein, so as to surround the sand, reduce the heat loss in all directions, and also reduce the amount of the insulation layer 65, thereby reducing the cost.

[0060] In some embodiments, the bottom of the box wall outside the material storage box 61 is tilted, so that the bottom of the internal space of the material storage box 61 is in the shape of a funnel that is wide at the top and narrow at the bottom. The funnel-shaped structure makes it easier for the sand in the material storage box 61 to be concentrated downward, not only to be easily discharged from the material storage outlet 62, but also to make the material storage outlets 62 of each material storage box 61 all be able to be concentrated at the center of the bottom of the sand storage device 6, and the top of the metering hopper 53 does not need to be larger in size to cover all the material storage outlets 62, thereby reducing the external dimensions of the sand metering device 5.

[0061] In some embodiments, a vibrator 8 is installed on both the storage box 61 and the metering hopper 53. The vibration generated by the vibrator 8 can accelerate the downward movement of the sand in the storage box 61 and the metering hopper 53, prevent the sand from adhering to the inner wall of the storage box 61 or the inner wall of the metering hopper 53, and make the sand discharge and empty more smoothly.

[0062] In some embodiments, the hot air heating device 7 includes a heating box, with an air inlet and an air outlet at both ends respectively. The heating box is installed on the cover 41, and the air outlet is connected to the heating air port opened on the side wall of the cover 41. A hot air blower is installed in the heating box.

[0063] When the hot air blower is running, air is sucked into the heating box through the air inlet, and after heating, it is blown into the cover 41 through the air outlet. The hot air entering the cover 41 is blown toward the outer wall of the mixing barrel, and the heat is transferred to the mixed sand material inside through the mixing barrel, thereby heating the mixed sand material. The hot air can flow along the outer wall of the mixing barrel, thereby fully covering all positions of the outer wall of the mixing barrel, heating the mixed sand material in the mixing barrel at all angles in the circumferential direction, and improving the heating efficiency. In addition, the hot air flow forms a heat layer on the outside, which heats the inside while the heat of the mixed sand material cannot be dissipated to the outside, so that the heating of the sand material is more efficient.

[0064] In some embodiments, the top plate of the cover shell 41 is attached to the opening at the top of the mixing barrel, so that the top plate of the cover shell 41 closes the opening of the mixing barrel, and the hot air flow blown in by the hot air blower will not flow into the mixing barrel, thereby avoiding blowing out the mixed sand in the barrel and causing it to fall into the vibrating screen 3 without being fully mixed.

[0065] In some embodiments, a pulse back-blowing dust collector 9 is installed on the dust removal port provided at the top of the cover 41, and the dust removal port is connected to the internal space of the mixing barrel. When the agitator 42 stirs the mixed material, the pulse back-blowing dust collector 9 collects the raised sand and sends it back to the mixing barrel by pulse back-blowing, so as to ensure that the mixed sand can be fully mixed in the mixing barrel and improve the stirring effect.

[0066] In some embodiments, an additive adding device 10 is further included, and the additive adding device 10 includes an additive tank 101 , an additive delivery pump 102 and an additive delivery pipe 103 .

[0067] The additive box 101 is installed on the frame 2 and is located below the vibrating screen 3. One end of the external delivery pipe 103 is connected to the additive box 101, and the other end is connected to the cover 41. The external delivery pump 102 is installed on the external delivery pipe 103 to deliver the additive in the additive box 101 to the mixing barrel in the cover 41 through the external delivery pipe 103.

[0068] The additive stored in the additive material box 101 is pumped by the additional delivery pump 102 and delivered to the mixing barrel in the housing 41 through the additional delivery pipe 103, and mixed into the mixed sand material for uniform mixing. The additive material box 101 is arranged below, lower than the sand mixer 4, and the additive is delivered from bottom to top, which can avoid the appearance of an empty pipe in the additional delivery pipe 103, and ensure the accurate dosage of the additive added to the mixed sand material.

[0069] In some embodiments, an electrical control cabinet 20 is further included, and the material storage valve 63 , the metering valve 55 , the agitator 42 , the discharge door and the hot air heating device 7 are all electrically connected to the electrical control cabinet 20 .

[0070] A material level meter 66 and a material storage temperature sensor 67 are installed in the material storage box 61 . The material level meter 66 , the material storage temperature sensor 67 and the weighing sensor 52 are all electrically connected to the electrical control cabinet 20 .

[0071] The electrical control cabinet 20 controls the valve and the discharge door switch, and starts and shuts down the agitator 42 and the hot air heating device 7. The electrical control cabinet 20 measures the height of the sand material in the storage box 61 through the material level meter 66, and measures the temperature of the sand material in the storage box 61 through the storage temperature sensor 67. The liquid heater is controlled to operate according to the detected temperature, and the liquid heater is turned off when the temperature reaches the set value, or the liquid heater is started when the temperature drops below the set value, so that the sand material in the storage box 61 reaches the set temperature. The electrical control cabinet 20 can control the metering valve 55 through the weighing sensor 52 to configure the mixed sand material. The electrical control cabinet 20 is connected to the hot air heating device 7 to control it and set its heating temperature.

[0072] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0073] The above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for which protection is requested in the utility model.

Claims

1. A sand mixing system for 3D printing equipment, characterized in that: Includes 3D printer and rack; The bottom of the frame has a first installation space, the 3D printer is located in the first installation space, and the top of the 3D printer has a printer feed port; A vibrating screen, a sand mixer, a sand metering device and a sand storage device are installed on the frame above the 3D printer in order from bottom to top; The sand storage device is a plurality of storage boxes arranged side by side, each of the storage boxes has a storage outlet at the bottom, and each of the storage outlets is provided with a storage valve for opening or closing the storage outlet; The sand metering device comprises a suspension, a weighing sensor and a metering hopper, wherein the suspension is mounted on the frame, and the metering hopper is suspended on the suspension through the weighing sensor, so that the weighing sensor weighs the material in the metering hopper, the top of the metering hopper is open, and the material storage outlets are all located directly above the metering hopper, so that the material discharged from the material storage box through the material storage outlets falls into the metering hopper, and a metering valve is installed on the metering outlet opened at the bottom of the metering hopper, so as to open or close the metering outlet; The sand mixer comprises a cover shell, a mixing barrel and an agitator. The bottom of the cover shell is provided with a material guide pipe, the material guide pipe is fixed on a support frame provided on the frame, the mixing barrel is installed in the cover shell, the driving motor of the agitator is installed outside the cover shell, the stirring paddle of the agitator is located in the mixing barrel, the stirring paddle passes through the cover shell upward and is connected to the driving motor, the top of the mixing barrel is open, the top of the cover shell is provided with a feeding pipe, the port of the feeding pipe is located directly below the metering outlet, so that the material discharged from the metering hopper through the metering outlet enters the cover shell through the feeding pipe and falls into the mixing barrel, and the mixing barrel is provided with a discharge door, so as to open or close the mixing discharge port provided at the bottom end of the mixing barrel; The vibrating screen is installed on the supporting frame, and a vibrating screen feed port and a vibrating screen discharge port are respectively provided at the top and bottom ends thereof, the vibrating screen feed port is located directly below the bottom end port of the guide tube, and the vibrating screen discharge port is located directly above the printer feed port; The sand mixer is equipped with a hot air heating device and a stirring temperature sensor. The stirring temperature sensor is installed on the cover shell and extends into the stirring barrel. The stirring temperature sensor is electrically connected to the hot air heating device so that the hot air heating device heats the material in the stirring barrel by blowing hot air.

2. The sand mixing system for 3D printing equipment according to claim 1, characterized in that: further comprising a liquid heater; A heating pipe is arranged in the wall of the material storage box, and the heating pipe surrounds the inner space of the material storage box and is spiral from top to bottom; The liquid heater comprises a liquid storage tank and a heating wire for heating the liquid in the liquid storage tank. The heat outlet of the liquid storage tank is connected to one end of the heating pipe through a circulation pump, and the other end of the heating pipe is connected to the liquid return port of the liquid storage tank.

3. The sand mixing system for 3D printing equipment according to claim 2, characterized in that: A heat-insulating layer is attached to the box wall outside the material storage box.

4. The sand mixing system for 3D printing equipment according to claim 1, characterized in that: The bottom of the box wall outside the material storage box is arranged to be inclined so that the bottom of the internal space of the material storage box is funnel-shaped.

5. The sand mixing system for 3D printing equipment according to claim 1, characterized in that: The material storage box and the metering hopper are both equipped with vibrators.

6. The sand mixing system for 3D printing equipment according to claim 1, characterized in that: The hot air heating device comprises a heating box, with an air inlet and an air outlet respectively provided at two ends of the heating box, the heating box is mounted on the cover shell, the air outlet is connected to the heating air outlet opened on the side wall of the cover shell, and a hot air blower is installed in the heating box.

7. The sand mixing system for 3D printing equipment according to claim 6, characterized in that: The top plate of the cover shell is attached to the opening at the top of the mixing barrel to close it.

8. The sand mixing system for 3D printing equipment according to claim 7, characterized in that: A pulse back-blowing dust collector is installed on the dust removal port arranged at the top of the cover shell, and the dust removal port is communicated with the inner space of the mixing barrel.

9. The sand mixing system for 3D printing equipment according to claim 1, characterized in that: It further comprises an additive adding device, the additive adding device comprises an additive material box, an additive delivery pump and an additive delivery pipe; The additive boxes are installed on the frame and are located below the vibrating screen; One end of the additional delivery pipe is connected to the additional agent box, and the other end is connected to the cover shell. The additional delivery pump is installed on the additional delivery pipe to deliver the additional agent in the additional agent box to the mixing barrel in the cover shell through the additional delivery pipe.

10. The sand mixing system for 3D printing equipment according to claim 1, characterized in that: It further comprises an electrical control cabinet, and the material storage valve, the metering valve, the agitator, the discharge door and the hot air heating device are all electrically connected to the electrical control cabinet; A material level meter and a material storage temperature sensor are installed in the material storage box, and the material level meter, the material storage temperature sensor and the weighing sensor are all electrically connected to the electrical control cabinet.

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