Sand cleaning device for 3D printing shell mold

Abstract

The utility model discloses a sand cleaning device for a 3D printing shell mold, and relates to the technical field of sand cleaning devices, the sand cleaning device comprises a shell, a sand storage chamber is arranged in the shell, an air outlet is formed in the front wall of the shell, a filter chamber is arranged between the corresponding air outlet and the sand storage chamber in the shell, and the sand storage chamber, the filter chamber and the air outlet are sequentially communicated to form an exhaust channel capable of filtering floating sand; the sand suction pipe assembly is connected with the shell and communicates with the sand storage chamber from the bottom wall of the shell so as to suck floating sand on the surface of the shell mold into the sand storage chamber; and the floating sand filtering assembly is mounted in the filtering chamber. According to the device, floating sand in the 3D printing shell mold can be completely discharged out of the shell mold, pollution caused by splashing and scattering of the floating sand can be avoided, and the casting quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sand cleaning device technical field, especially a kind of sand cleaning device for 3D printing shell type. BACKGROUND

[0002] With the development of 3D printing technology, casting sand mold 3D printing has been introduced by many domestic manufacturers, using 3D printing equipment can directly print the structure of casting sand mold, save the mold manufacturing cost and shorten the mold development cycle. Casting production process is made into type-pouring-cleaning-cutting-rough repair-heat treatment-fine repair, sand mold 3D printing shell process belongs to the type-making process in casting production process, is the key process in casting production.

[0003] After product shell printing, the cleaning of sand shell surface floating sand is the most critical process. Since 3D printing shell structure does not need to consider the factors such as draft and parting, many product sand shell structures are complex, especially the combined shell product. If traditional air gun blowing method is used for cleaning, it is difficult to avoid that floating sand will remain in the "dead angle" of the shell. Even if the shell is designed with a sand collecting groove, it is also difficult to ensure that the floating sand is completely removed. The floating sand remaining in the dead angle of the shell will cause sand inclusion defects in the casting, and even cause the casting to be scrapped. Moreover, the air pressure air gun blowing method will cause the floating sand in the sand mold cavity to splash and scatter, which is easy to cause pollution in the workshop. The blown floating sand will also scatter into the shell of the nearby product, causing secondary impact. Therefore, the sand removal method needs to be optimized and improved.

[0004] Therefore, how to provide a sand cleaning device for 3D printing shell, which can completely remove the floating sand in the 3D printing shell, and can avoid the pollution caused by the splashing and scattering of floating sand, and improve the quality of the casting is a problem that needs to be solved by those skilled in the art. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model provides a sand cleaning device for 3D printing shell, which aims to solve the technical problem that the traditional sand cleaning device uses blowing method to clean the shell, which is easy to cause the splashing and scattering of floating sand, and pollute the workshop and the shell of the nearby product.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] The utility model provides a sand cleaning device for 3D printing shell, which comprises:

[0008] The shell is provided with a sand storage chamber, an exhaust port is arranged on the front wall of the shell, a filter chamber is arranged between the exhaust port and the sand storage chamber in the shell, and the sand storage chamber, the filter chamber and the exhaust port are sequentially communicated to form an exhaust passage for filtering floating sand;

[0009] sand suction pipe assembly, which is connected to the shell and communicates with the sand storage chamber from the bottom wall of the shell to suck the floating sand on the surface of the shell into the sand storage chamber;

[0010] floating sand filtering assembly, which is installed in the filtering chamber.

[0011] The utility model discloses a sand suction pipe assembly is used to suck the floating sand on the outer wall and the inner cavity of shell type into the sand storage chamber by the suction mode and is concentratedly collected, can avoid the splashing and scattering of floating sand, and the gas can be smoothly discharged from the exhaust port through the exhaust passage, the floating sand is blocked by the floating sand filtering assembly and cannot be discharged, which can not pollute the workshop environment, and the floating sand can also avoid polluting the nearby product shell type. The utility model can completely discharge the floating sand in the 3D printing shell type from the shell type, can avoid the pollution caused by the splashing and scattering of floating sand, and can improve the casting quality.

[0012] As a further improvement of the above technical solution, the sand suction pipe assembly comprises a sand suction pipe, an air supply branch pipe, a hose assembly and a gas source.

[0013] The sand suction pipe is fixedly connected to the bottom wall of the shell and communicates with the sand storage chamber at the outlet end; one end of the air supply branch pipe is an air inlet connected to the external gas source, and the other end is obliquely connected to and communicates with the sand suction pipe to supply air to the outlet end of the sand suction pipe and form a negative pressure at the inlet end of the sand suction pipe; one end of the hose assembly is connected to the inlet end of the sand suction pipe, and the other end is a suction nozzle that can be close to the surface of the shell type or inserted into the inner cavity of the shell type to suck the floating sand.

[0014] The beneficial effects of the above technical solution are that the air supply branch pipe is used to connect the external gas source to provide high-speed airflow; since the air supply branch pipe is obliquely connected to the sand suction pipe and supplies air to the outlet end of the sand suction pipe, the high-speed airflow can form a negative pressure at the inlet end of the sand suction pipe when being sprayed out of the outlet of the air supply branch pipe, and the hose assembly connected to the inlet end of the sand suction pipe forms a suction pipe structure under the action of the negative pressure. The hose assembly can conveniently adjust the spatial position of the suction nozzle and can be flexibly changed in multiple directions in the sand mold cavity to smoothly clean the complex internal structure positions such as volute shells and efficiently adsorb the floating sand in dead angles.

[0015] As a further improvement of the above technical solution, the hose assembly comprises a plurality of hoses, one end of each of the plurality of hoses is detachably connected to the inlet end of the sand suction pipe, and the other end of each of the plurality of hoses is a suction nozzle.

[0016] The suction nozzles of the plurality of hoses are in any one of a circular tube shape, an elliptical tube shape, a conical tube shape and a rectangular tube shape.

[0017] The beneficial effects of the above technical solution are: different lengths and diameters of the hose can be adjusted and replaced to adapt to different shell-shaped sand cleaning, and different nozzle shapes can be selected to adapt to different shell-shaped inner and outer contour structures.

[0018] As a further improvement of the above technical solution, the outlet end of the sand cleaning suction pipe extends to the top of the sand storage chamber.

[0019] The beneficial effects of the above technical solution are: the outlet end of the sand cleaning suction pipe extends to the top of the sand storage chamber, and a concentrated sand storage area can be formed in the middle and bottom of the sand storage chamber to prevent the outlet end of the sand cleaning suction pipe from being blocked by floating sand in the sand storage chamber.

[0020] As a further improvement of the above technical solution, the floating sand filter assembly includes filter layer one, filter layer two and filter layer three, which are arranged in sequence along the air outlet direction of the exhaust passage; the filter gaps of the filter layer one, the filter layer two and the filter layer three decrease in sequence.

[0021] The beneficial effects of the above technical solution are: by setting three layers of filter layers, and the filtering capacity from low to high along the air outlet direction, the filter can effectively avoid being blocked during use, affecting the sand suction effect.

[0022] As a further improvement of the above technical solution, the filter layer one is a filter mesh layer, the filter layer two is a filter cotton layer, and the filter layer three is a filter paper layer.

[0023] The beneficial effects of the above technical solution are: the filter mesh layer is used to filter larger floating sand particles, the filter cotton layer is used to filter medium and fine particle size floating sand, and the filter paper layer is used to filter even smaller floating sand, which effectively avoids floating sand overflow and pollution of the surrounding environment while ensuring smooth air outlet.

[0024] As a further improvement of the above technical solution, the top wall of the shell body is provided with a filter layer installation and removal opening corresponding to the filter chamber; and a filter compartment cover is installed on the shell body, which can open and close the filter layer installation and removal opening.

[0025] The beneficial effects of the above technical solution are: opening the filter compartment cover, the filter layer one, the filter layer two and the filter layer three can be taken out for maintenance or replacement.

[0026] As a further improvement of the above technical solution, the top wall of the shell body is provided with a sand pouring opening corresponding to the sand storage chamber; and a sand storage compartment cover is installed on the shell body, which can open and close the sand pouring opening.

[0027] The beneficial effects of the above technical solution are: when the amount of floating sand in the sand storage chamber is large, the sand storage compartment cover can be opened to pour the floating sand in the sand storage chamber out of the sand pouring opening.

[0028] As a further improvement of the above technical solution, the rear wall of the shell is provided with an ear.

[0029] The beneficial effects of the above technical solution are: during use, the method of holding the ear can be used, or the method of hoisting the ear by a workshop trolley can be used, or the shell can be directly placed on an open space in the workshop for use, the use method is flexible, and the device can be applied in different environments.

[0030] As a further improvement of the above technical solution, the filter chamber is arranged corresponding to the middle and top of the sand storage chamber.

[0031] The beneficial effects of the above technical solution are: the filter chamber corresponds to the middle and top of the sand storage chamber, so that when the shell is vertically arranged, the floating sand accumulated at the bottom of the sand storage chamber cannot affect the filtering and aeration effects of the floating sand filtering assembly in the filter chamber.

[0032] Via the above technical solution, compared with the prior art, the sand cleaning device for the 3D printing shell has the following advantages and beneficial effects:

[0033] 1. The hose assembly can adopt silica gel hoses of various specifications, the suction nozzle can be flexibly changed in multiple directions in the sand mold cavity, and floating sand in dead corners can be efficiently adsorbed. In addition, the design increases the filtering structure, concentrates the adsorbed floating sand in the sand storage chamber, does not pollute the environment of the workshop, especially does not cause secondary influence on surrounding sand molds. The air supply branch pipe can be directly assembled and matched with the existing pressure air gun in the workshop, without the need to increase power equipment, and cost consumption is avoided.

[0034] 2. In addition to being applied to 3D printing shells, the device can also be applied to resin sand molds, clay sand molds and film-coated sand molds; has the characteristics of simple operation and stable device use process; can significantly improve work efficiency and work quality, and can obviously reduce casting sand eye and sand inclusion defects and reduce the production process cost of castings by cleaning the surface of the shell and floating sand in dead corners and adsorbing floating sand in the suction cavity after the shell is combined. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0036] Figure 1 The present application is a kind of sand cleaning device for 3D printing shell internal structure schematic diagram;

[0037] Figure 2 The present application is a kind of sand cleaning device for 3D printing shell internal structure schematic diagram;Figure 1 Structure enlarged schematic view at middle A;

[0038] Figure 3 The utility model discloses a sand cleaning device whole structure stereogram for 3D printing shell type;

[0039] In the figure: 1, shell; 11, sand storage chamber; 12, sand suction pipe assembly; 121, sand suction pipe; 122, air supply branch pipe; 123, hose assembly; 13, exhaust port; 14, filter chamber; 141, sand filtering assembly; 1411, filter layer one; 1412, filter layer two; 1413, filter layer three; 15, filter layer installation and dismounting mouth; 16, filter bin cover; 17, sand pouring mouth; 18, sand storage bin cover; 19, lifting lug; 2, hinge; 3, fastening assembly; 31, fixed column; 32, fastening plate; 33, pressure column; 34, lock washer; 35, fastening nut. DETAILED DESCRIPTION

[0040] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the utility model, and cannot be understood as a limitation of the utility model.

[0041] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation of the utility model.

[0042] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0043] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on terms should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can through intermediate medium indirectly connect, can be two element inside's intercommunication or two element's mutual action relation. For ordinary skilled person in the art, can understand the concrete meaning of above -mentioned term in the utility model according to specific circumstances.

[0044] As Figures 1 to 3 The utility model discloses a sand cleaning device for 3D printing shell type, including:

[0045] Shell 1 is equipped with sand storage chamber 11 in shell 1, and the front wall of shell 1 is equipped with exhaust port 13, and the filter chamber 14 is equipped with between sand storage chamber 11 and exhaust port 13 in shell 1, and sand storage chamber 11, filter chamber 14 and exhaust port 13 are sequentially communicated to form the exhaust passage of filterable floating sand;

[0046] Sand suction pipe assembly 12 is connected shell 1 and communicates sand storage chamber 11 from the bottom wall of shell 1 to suction floating sand on the surface of shell type into sand storage chamber 11;

[0047] Floating sand filter assembly 141 is installed in filter chamber 14 to filter and block floating sand, prevent floating sand in sand storage chamber 11 from being discharged from exhaust port 13 to the outside of shell 1.

[0048] The embodiment utilizes sand suction pipe assembly 12 to suction floating sand on the outer wall and inner cavity of shell type into sand storage chamber 11 by suction mode and concentrates collection, can avoid floating sand splashing and scattering;And gas can be smoothly discharged from exhaust port 13 along exhaust passage, and floating sand is blocked by floating sand filter assembly 141 and will not be discharged, will not pollute workshop environment, also avoids that floating sand pollutes nearby product shell type. The utility model can completely discharge floating sand in 3D printing shell type from shell type, and can avoid pollution caused by floating sand splashing and scattering, and then can improve casting quality.

[0049] Specifically, exhaust port 13 is located at the top of the front wall of shell 1.

[0050] In some embodiments, sand suction pipe assembly 12 includes sand cleaning suction pipe 121, air supply branch pipe 122, hose assembly 123 and gas source 124.

[0051] The sand suction pipe 121 is fixedly connected to the bottom wall of the shell 1 and has an outlet end communicating with the sand storage chamber 11; the air supply branch pipe 122 has an air inlet end connected to an external air source and an inclined end connected to and communicating with the sand suction pipe 121 to supply air to the outlet end of the sand suction pipe 121 and form a negative pressure at the inlet end of the sand suction pipe 121; the hose assembly 123 has one end connected to the inlet end of the sand suction pipe 121 and the other end as a suction nozzle capable of being close to the surface of the shell or inserted into the cavity to suck the floating sand.

[0052] The air supply branch pipe 122 is used to connect to an external air source to provide a high-speed air flow; since the air supply branch pipe 122 is inclinedly connected to the sand suction pipe 121 and supplies air to the outlet end of the sand suction pipe 121, the high-speed air flow sprayed out of the outlet of the air supply branch pipe 122 can form a negative pressure at the inlet end of the sand suction pipe 121, so that the hose assembly 123 connected to the inlet end of the sand suction pipe 121 forms a suction pipe structure under the action of the negative pressure. The hose assembly 123 can facilitate the adjustment of the spatial position of the suction nozzle and can be flexibly changed in multiple directions in the sand mold cavity to smoothly reach the complex internal structure position such as a volute for cleaning, thereby efficiently sucking the floating sand in the dead angle.

[0053] Specifically, the inlet end of the sand suction pipe 121 is an interface connected to the hose assembly 123; the other end of the air supply branch pipe 122 is an aerodynamic interface connected to the external air source.

[0054] In some embodiments, the hose assembly 123 includes a plurality of hoses, and one end of each of the plurality of hoses is detachably connected to the inlet end of the sand suction pipe 121, and the other end of each of the plurality of hoses is a suction nozzle.

[0055] The suction nozzle of each of the plurality of hoses is in any one of a circular tube shape, an elliptical tube shape, a conical tube shape, and a rectangular tube shape.

[0056] Different lengths and diameters of the hoses can be adjusted and replaced to adapt to different shell sand cleaning, and different shapes of the suction nozzles can be selected to adapt to different shell internal and external contour structures.

[0057] Specifically, the hose is a silica gel hose; the air pressure provided by the external air source connected to the air inlet end of the air supply branch pipe 122 through the pipeline is not less than 0.6 MPa to meet the power requirement of sand suction. The external air source can be an air compressor or an air pump. According to actual needs, a valve can be installed on the air supply branch pipe 122 to flexibly control the air supply pressure by adjusting the opening degree of the valve; of course, the air supply pressure of the air source can also be directly adjusted to adjust the suction force of the hose.

[0058] In some embodiments, the outlet end of the sand suction pipe 121 extends to the top of the sand storage chamber 11.

[0059] The outlet end of the sand suction pipe 121 extends to the top of the sand storage chamber 11, and a concentrated sand storage area can be formed in the middle and bottom of the sand storage chamber 11 to prevent the outlet end of the sand suction pipe 121 from being blocked by floating sand in the sand storage chamber 11.

[0060] In some embodiments, the floating sand filtering assembly 141 includes a filtering layer one 1411, a filtering layer two 1412, and a filtering layer three 1413, which are arranged in sequence along the air outlet direction of the exhaust passage; and the filtering gaps of the filtering layer one 1411, the filtering layer two 1412, and the filtering layer three 1413 decrease in sequence.

[0061] By arranging three filtering layers and gradually increasing the filtering capacity along the air outlet direction, the filtering assembly can effectively avoid filtering blockage during use and affect the sand suction effect.

[0062] In some embodiments, the filtering layer one 1411 is a filtering mesh layer, the filtering layer two 1412 is a filtering cotton layer, and the filtering layer three 1413 is a filtering paper layer.

[0063] The filtering mesh layer is used to filter large floating sand particles, the filtering cotton layer is used to filter medium and fine floating sand particles, and the filtering paper layer is used to filter even smaller floating sand particles, thereby effectively preventing floating sand overflow and surrounding environment pollution while ensuring smooth air outlet.

[0064] Specifically, the filtering layer one 1411, the filtering layer two 1412, and the filtering layer three 1413 are stacked in sequence to fill the filtering chamber 14, thereby improving the floating sand filtering effect; and the filtering layer one 1411, the filtering layer two 1412, and the filtering layer three 1413 can be individually taken out for maintenance or replacement.

[0065] In some embodiments, the top wall of the shell 1 is provided with a filter layer mounting and dismounting opening 15 corresponding to the filtering chamber 14; and the shell 1 is provided with a filter compartment cover 16 that can open and close the filter layer mounting and dismounting opening 15.

[0066] The filter compartment cover 16 can be opened to take out the filtering layer one 1411, the filtering layer two 1412, and the filtering layer three 1413 for maintenance or replacement.

[0067] Specifically, one end of the filter compartment cover 16 is hinged to one side of the top end of the shell 1 corresponding to the filter layer mounting and dismounting opening 15 through a hinge 2; the other side of the top end of the shell 1 corresponding to the filter layer mounting and dismounting opening 15 is provided with a fastening assembly 3; and when the filter compartment cover 16 is adapted to be tightly closed on the filter layer mounting and dismounting opening 15, the filter compartment cover 16 can be fastened to the top end of the shell 1 through the fastening assembly 3, thereby improving the sealing effect of the filter layer mounting and dismounting opening 15.

[0068] Specifically, the fastening assembly 3 comprises a fixing column 31, a fastening plate 32, a pressing column 33, a lock washer 34 and a fastening nut 35; the fixing column 31 is vertically fixed at the top end of the shell 1; the fastening plate 32 is provided with a sleeve hole at one end and a notch at the other end; the fastening plate 32 is sleeved on the fixing column 31 at one end, and the lock washer 34 is installed on both sides of the fastening plate 32; the pressing column 33 is arranged corresponding to the notch at the other end of the fastening plate 32 and is hinged on the fastening plate 32 through a hinge shaft; the pressing column 33 can rotate around the hinge shaft and can be vertically pressed on the top surface of the filter bin cover 16; the fastening nut 35 is screwed on the fixing column 31 and can fasten the fastening plate 32 on the shell 1, so that the pressing column 33 presses the top surface of the filter bin cover 16, so that the filter bin cover 16 tightly seals the filter layer access hole 15.

[0069] In some embodiments, the top wall of the shell 1 is provided with a sand pouring opening 17 corresponding to the sand storage chamber 11; the shell 1 is provided with a sand storage bin cover 18 which can open and close the sand pouring opening 17.

[0070] When the amount of floating sand in the sand storage chamber 11 is large, the sand storage bin cover 18 can be opened to pour the floating sand in the sand storage chamber 11 out of the sand pouring opening 17.

[0071] Specifically, one end of the sand storage bin cover 18 is hinged to one side of the top end of the shell 1 corresponding to the sand pouring opening 17 through a hinge 2; the other side of the top end of the shell 1 corresponding to the sand pouring opening 17 is provided with a fastening assembly 3; when the sand storage bin cover 18 is adapted to seal the sand pouring opening 17, the sand storage bin cover 18 can be fastened on the top end of the shell 1 through the fastening assembly 3 to improve the sealing effect of the sand pouring opening 17.

[0072] In some embodiments, the rear wall of the shell 1 is provided with an ear 19; the ear 19 is annular and can be used as a hand-held handle.

[0073] During use, the ear 19 can be held by hand, or the ear 19 can be lifted by a workshop crane, or the shell 1 can be directly placed on an open site in the workshop for use; the use method is flexible and can be applied in different environments.

[0074] In some embodiments, the filter chamber 14 is arranged corresponding to the middle and top of the sand storage chamber 11.

[0075] The filter chamber 14 is arranged corresponding to the middle and top of the sand storage chamber 11, so that when the shell 1 is vertically arranged, the floating sand accumulated at the bottom of the sand storage chamber 11 will not affect the filtering and aeration effect of the floating sand filtering assembly 141 in the filter chamber 14.

[0076] In some embodiments, the part of the sand cleaning suction pipe 121 located in the sand storage chamber 11 is curved and arc-shaped towards the side close to the filter chamber 14; the outlet end of the sand cleaning suction pipe 121 is arranged corresponding to the filter chamber 14; the air outlet direction of the air supply branch pipe 122 is towards the outlet end of the sand cleaning suction pipe 121.

[0077] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and integrate different embodiments or examples described in the present specification.

[0078] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A sand cleaning device for 3D printed shell molds, characterized in that, The application relates to a sand suction device for a sand casting mold. The device comprises a shell (1) with a sand storage chamber (11) arranged in the shell (1), an air outlet (13) arranged on a front wall of the shell (1), a filter chamber (14) arranged in the shell (1) and corresponding to the air outlet (13) and the sand storage chamber (11), and an exhaust passage formed by the sand storage chamber (11), the filter chamber (14) and the air outlet (13) in sequence. The device further comprises a sand suction pipe assembly (12) connected to the shell (1) and communicating with the sand storage chamber (11) through a bottom wall of the shell (1) to suck floating sand on a surface of the sand casting mold into the sand storage chamber (11). The device further comprises a floating sand filter assembly (141) arranged in the filter chamber (14).

2. A sand cleaning device for 3D printed shell molds according to claim 1, characterized in that, The sand suction pipe assembly (12) comprises a sand suction pipe (121), an air supply branch pipe (122) and a hose assembly (123). The sand suction pipe (121) is fixedly connected to the bottom wall of the shell (1) and has an outlet end communicating with the sand storage chamber (11).

3. The sand cleaning device for 3D printed shell mold according to claim 2, wherein, The air supply branch pipe (122) has an air inlet end connected to an external air source and an inclined end communicating with the sand suction pipe (121) to supply air to the outlet end of the sand suction pipe (121) and form a negative pressure at an inlet end of the sand suction pipe (121). The hose assembly (123) has one end connected to the inlet end of the sand suction pipe (121) and the other end provided with a suction nozzle capable of being close to the surface of the sand casting mold or inserted into an inner cavity of the sand casting mold to suck floating sand.

4. The sand cleaning device for 3D printed shell mold according to claim 2, wherein, The hose assembly (123) comprises a plurality of hoses, each of which has one end detachably connected to the inlet end of the sand suction pipe (121) and the other end provided with a suction nozzle.

5. The sand cleaning device for 3D printed shell mold according to claim 1, wherein, The suction nozzles of the plurality of hoses are in any one of a circular tube shape, an elliptical tube shape, a conical tube shape and a rectangular tube shape.

6. A sand cleaning device for 3D printed shell molds according to claim 5, characterized in that The outlet end of the sand suction pipe (121) extends to a top portion of the sand storage chamber (11).

7. A sand cleaning device for 3D printed shell molds according to claim 5, characterized in that, The floating sand filter assembly (141) comprises a first filter layer (1411), a second filter layer (1412) and a third filter layer (1413) arranged in the exhaust passage in sequence.

8. The sand cleaning device for 3D printed shell mold according to claim 1, wherein, The first filter layer (1411) is a filter screen layer, the second filter layer (1412) is a filter cotton layer and the third filter layer (1413) is a filter paper layer.

9. The sand cleaning device for 3D printed shell mold according to claim 1, wherein, A filter layer mounting and dismounting opening (15) is arranged in a top wall of the shell (1) and corresponding to the filter chamber (14).

10. The sand cleaning device for 3D printed shell mold according to claim 1, wherein, A sand storage chamber cover (18) is arranged on the shell (1) and capable of opening and closing the sand discharge opening (17) corresponding to the sand storage chamber (11). A lifting lug (19) is arranged on a rear wall of the shell (1). The filter chamber (14) is arranged corresponding to a middle portion and a top portion of the sand storage chamber (11).

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