Precoated sand mixing device

Abstract

A precoated sand mixing device comprises a grinding cylinder, a material mixing cylinder and an auxiliary material supply pipe, a grinding cavity is formed in the grinding cylinder, a feeding cylinder communicated with the grinding cavity is fixedly arranged on the outer wall of the grinding cylinder, the material mixing cylinder is coaxially arranged on the outer side of the grinding cylinder, the grinding cylinder is used for grinding crude sand, and the auxiliary material supply pipe is used for supplying auxiliary materials to the grinding cylinder. The grinding cylinder is used for grinding crude sand and conveying the ground crude sand into the material mixing cylinder, the auxiliary material supply pipe can quantitatively convey auxiliary materials into the material mixing cylinder through the grinding cylinder, and the ground crude sand and the auxiliary materials are mixed in the material mixing cylinder according to a set proportion range. In the grinding process, the raw sand is ground into proper granularity, screened materials fall into the material mixing barrel, in the raw sand grinding process, auxiliary materials matched with the sand amount are added into the material mixing barrel through the auxiliary material supply pipe, the raw sand and the auxiliary materials are gradually added and mixed, the energy consumption during material mixing can be reduced, and the material mixing efficiency can also be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of coated sand production, and specifically refers to a coated sand mixing device. Background Art

[0002] Coated sand is a kind of molding sand or core sand with a layer of solid resin film on the surface of sand particles, which is mainly used in the casting process. It mainly uses high-quality selected natural quartz sand as raw sand, thermoplastic phenolic resin, hexamethylenetetramine and reinforcing agent as raw materials, and is made by cold or hot coating processes. The hot method of coating sand mixing is to preheat the sand to a certain temperature, then add resin to melt it, stir it to make the resin evenly coated on the surface of the sand particles, then add hexamethylenetetramine aqueous solution and lubricant, and finally cool, crush and screen to obtain coated sand.

[0003] The process of preparing coated sand by thermal coating is to first heat the raw sand to a certain temperature (usually 140~160℃), and then mix and stir with resin, urotropine aqueous solution and calcium stearate respectively. The current sand mixing device is generally a set of grinding rollers and a set of mixing agitators set in a vertical cylinder, which can integrate grinding and mixing. However, during the mixing and stirring process, the grinding roller can only grind the raw sand at the bottom, and the weight of the raw sand in the stirring process all acts downward on the agitator. Not only is the energy consumption in the stirring process high, but the grinding and mixing speed is slow. Therefore, an efficient sand mixing device is urgently needed. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a coated sand mixing device to at least partially solve the problems raised in the above background technology.

[0005] The technical solution adopted by the present invention is as follows: a coated sand mixing device is proposed, comprising: A grinding cylinder with a horizontal axis, a grinding cavity is provided inside the grinding cylinder, and a feed cylinder connected to the grinding cavity is fixedly provided on the outer wall; A mixing cylinder, coaxially arranged outside the grinding cylinder; An auxiliary material feeding pipe, the input end of which is connected to an external feeding device, and the output end of which is connected to the grinding cylinder; A base is arranged below the mixing cylinder, the base is provided with a bracket for fixing the grinding cylinder, and the base is provided with a driving roller capable of driving the mixing cylinder to rotate, so that the base can rotate outside the grinding cylinder; The grinding cylinder is used to grind raw sand and transport the ground raw sand into the mixing cylinder, and the auxiliary material feeding pipe can quantitatively transport the auxiliary material into the mixing cylinder through the grinding cylinder.

[0006] Furthermore, the grinding cylinder includes a cylinder body and a grinding shaft rotatably installed in the cylinder body, a first motor for driving the grinding shaft to rotate is fixed to one end of the cylinder body, a plurality of groups of intermittently distributed grinding plates are fixed on the outer wall of the grinding shaft, and the plurality of groups of grinding plates are spirally arranged, so that the raw sand in the grinding chamber can be driven by the grinding shaft to be fed into the mixing cylinder.

[0007] Furthermore, the feeding direction in the grinding chamber into the mixing barrel is defined as a first direction, and the opposite direction is defined as a second direction, each group of the grinding plates includes a first grinding plate and a second grinding plate, the feeding direction of the first grinding plate is the first direction, the feeding direction of the second grinding plate is the second direction, the first grinding plates and the second grinding plates are sequentially distributed along the first direction, and the number of the first grinding plates is greater than the number of the second grinding plates.

[0008] Furthermore, the spacing between the first grinding plate or the second grinding plate in the same group and the inner wall of the cylinder along the first direction decreases step by step, and the arc of the first grinding plate or the second grinding plate in the circumferential direction is set between π and π.

[0009] Furthermore, a screen is provided on the outer wall of the cylinder, so that the raw sand can pass through the screen and enter the mixing cylinder after grinding. A material equalization bin is provided on the outer wall of the cylinder facing the base, and the material equalization bin is located on the outside of the screen. A material equalization net is fixedly provided at the bottom of the material equalization bin, and the area of ​​the material equalization net is larger than the area of ​​the screen.

[0010] Furthermore, multiple screens are arranged along the axial direction, and the multiple screens are distributed below the second grinding plate. Multiple groups of guide plates are provided in the material balancing bin for evenly diffusing the raw sand at the screens to the material balancing net, so that the sand discharged from the multiple screens is evenly dispersed to the material balancing net and discharged into the mixing barrel through the material balancing net.

[0011] Furthermore, an auxiliary material conveying cylinder is provided on the outer wall of the cylinder, and the auxiliary material conveying cylinder is arranged parallel to the cylinder in the horizontal direction. An auxiliary material conveying cavity is provided inside the auxiliary material conveying cylinder, and a plurality of equidistantly distributed discharge pipes are provided at the bottom of the auxiliary material conveying cylinder, and the discharge pipe is connected to the auxiliary material conveying cavity, and the output end of the auxiliary material feed pipe is connected to the auxiliary material conveying cavity.

[0012] Furthermore, a bearing is installed at the connection between the mixing barrel and the grinding barrel, so that the mixing barrel can rotate on the outside of the grinding barrel, and the base is provided with four driving rollers distributed on both sides below the mixing barrel, and the base is provided with a second motor for driving the driving rollers to rotate, so that the second motor can drive the driving rollers to drive the mixing barrel to rotate.

[0013] Furthermore, a plurality of mixing fins are provided on the inner wall of the mixing barrel and are centrally symmetrically distributed around the axis of the grinding barrel. The mixing fins are detachably mounted on the inner wall of the mixing barrel. The mixing barrel is constructed as an arc-shaped plate, and the mixing fins can drive the material to be fed in the axial direction.

[0014] Furthermore, more than two mixing fins are provided along the axial direction, and the feeding directions of two adjacent mixing fins are opposite.

[0015] Beneficial effects: The grinding cylinder in the present invention grinds the raw sand in advance, and during the grinding process, the sand ground to a suitable particle size is screened and dropped into the mixing cylinder. During the raw sand grinding process, auxiliary materials matching the amount of sand are added to the mixing cylinder through an auxiliary material feeding pipe, so that the raw sand and the auxiliary materials are added and mixed gradually, which can not only reduce the energy consumption during material mixing, but also improve the mixing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the three-dimensional structure of one side of a support in a coated sand mixing device proposed in an embodiment of the present invention; Figure 2 A schematic diagram of the three-dimensional structure of one side of a discharge window in a coated sand mixing device proposed in an embodiment of the present invention; Figure 3 A schematic diagram of the internal structure of a coated sand mixing device proposed in an embodiment of the present invention; Figure 4 A schematic diagram of the internal structure of a mixing barrel according to an embodiment of the present invention; Figure 5 A schematic cross-sectional structure diagram of a coated sand mixing device proposed in an embodiment of the present invention; Figure 6 A schematic diagram of the three-dimensional structure of the cross section of a coated sand mixing device proposed in an embodiment of the present invention.

[0017] Among them, 10, grinding cylinder; 100, grinding chamber; 101, feeding cylinder; 11, cylinder body; 111, screen; 12, grinding shaft; 121, first grinding plate; 122, second grinding plate; 13, material distribution bin; 131, material distribution net; 132, guide plate; 14, auxiliary material conveying cylinder; 140, auxiliary material conveying chamber; 141, heating wire; 15, discharge pipe; 20, first motor; 30, mixing cylinder; 301, discharge window; 31, mixing fins; 40, auxiliary material feeding pipe; 50, driving roller; 51, second motor; 60, base; 61, bracket.

[0018] The accompanying drawings are used to provide further understanding of the embodiments and constitute a part of the specification. They are used for explanation together with the embodiments and do not constitute a limitation of the embodiments. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection.

[0020] In the description of the embodiments, it should be understood that terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the embodiments.

[0021] In an embodiment of the present invention, a coated sand mixing device is provided, which aims to improve the mixing efficiency of the sand mixing device. The device mainly includes a grinding cylinder 10, a mixing cylinder 30 and an auxiliary material feeding pipe 40.

[0022] Among them, the axis of the grinding cylinder 10 is set horizontally, a grinding chamber 100 is provided inside the grinding cylinder 10, and a feeding cylinder 101 connected with the grinding chamber 100 is fixedly provided on the outer wall. The feeding cylinder 101 is arranged on the grinding cylinder 10 in a vertical downward direction, so that the sand introduced into the feeding cylinder 101 can directly fall into the grinding chamber 100 of the grinding cylinder 10.

[0023] Further, the mixing cylinder 30 is coaxially arranged on the outside of the grinding cylinder 10, the input end of the auxiliary material feeding pipe 40 is connected to the external feeding device, and the output end is connected to the grinding cylinder 10, and auxiliary materials including resin, urotropine aqueous solution and calcium stearate can be provided to the mixing cylinder 30. The base 60 is arranged below the mixing cylinder 30, and a bracket 61 for fixing the grinding cylinder 10 is provided on the base 60. The base 60 is provided with a driving roller 50 that can drive the mixing cylinder 30 to rotate, so that the base 60 can rotate on the outside of the grinding cylinder 10.

[0024] In this way, the grinding cylinder 10 is only used to grind raw sand, and the ground raw sand is transported to the mixing cylinder 30 through the discharge port of the grinding cylinder 10. The auxiliary material feeding pipe 40 can quantitatively transport the auxiliary material to the mixing cylinder 30 through the grinding cylinder 10, so that the ground raw sand and the auxiliary material are mixed in the mixing cylinder 30 within a set ratio range.

[0025] Compared with the current method of grinding and mixing raw sand and auxiliary materials together in a sand mixing silo, the grinding cylinder 10 in the present invention grinds the raw sand in advance, and during the grinding process, the raw sand that has been ground to a suitable particle size is screened and dropped into the mixing cylinder 30. During the raw sand grinding process, auxiliary materials that match the amount of sand are added to the mixing cylinder 30 through the auxiliary material feed pipe 40, so that the raw sand and auxiliary materials are added and mixed gradually, which can not only reduce the energy consumption during material mixing, but also improve the mixing efficiency.

[0026] like Figure 3 As shown, the grinding cylinder 10 includes a cylinder body 11 and a grinding shaft 12 rotatably installed in the cylinder body 11, and a first motor 20 for driving the grinding shaft 12 to rotate is fixed at one end of the cylinder body 11. A plurality of groups of intermittently distributed grinding plates are fixed on the outer wall of the grinding shaft 12, and the plurality of groups of grinding plates are spirally arranged, so that the raw sand in the grinding chamber 100 can be driven by the grinding shaft 12 to be fed into the mixing cylinder 30.

[0027] During operation, the raw sand entering the grinding cylinder 10 from the feed cylinder 101 is fed forward by the grinding plate on the outer side of the rotating grinding shaft 12, and in the feeding process, the grinding plate and the inner wall of the cylinder 11 grind each other, so that the particles of the raw sand are ground to the set particle size, thereby realizing the grinding and transportation of the raw sand.

[0028] The feeding direction in the grinding chamber 100 into the mixing barrel 30 is defined as the first direction, and the opposite direction is defined as the second direction. Each group of grinding plates includes a first grinding plate 121 and a second grinding plate 122. The feeding direction of the first grinding plate 121 is the first direction, and the feeding direction of the second grinding plate 122 is the second direction. The first grinding plates 121 and the second grinding plates 122 are sequentially distributed along the first direction, and the number of the first grinding plates 121 is greater than the number of the second grinding plates 122. In this way, when the raw sand in the grinding chamber 100 passes through the first grinding plate 121, it will be ground and fed forward (in the first direction) by the first grinding plate 121, and when passing through the second grinding plate 122, it will be ground and fed backward (in the second direction) by the second grinding plate 122.

[0029] In some embodiments, the ratio of the number of the first grinding plates 121 to the number of the second grinding plates 122 is set to 3:1-4:1, that is, the abrasive material passes through three or four first grinding plates 121 and then passes through one second grinding plate 122, so that the abrasive material can be fully ground.

[0030] Furthermore, the spacing between the first grinding plate 121 or the second grinding plate 122 of the same group and the inner wall of the cylinder 11 along the first direction is gradually reduced. In this way, as the sand material is gradually fed forward, the sand material can be gradually ground and crushed, prompting the raw sand to be ground and discharged into the mixing barrel 30.

[0031] In some embodiments, in order to make the grinding plate have grinding ability and a certain feeding ability, the arc of the first grinding plate 121 or the second grinding plate 122 in the circumferential direction is set between π and 2π, and the first grinding plate 121 or the second grinding plate 122 can not only grind the abrasive material when rotating, but also transport the abrasive material in a set direction (forward or backward).

[0032] like Figure 3 , Figure 5 and Figure 6 As shown, a screen 111 is provided on the outer wall of the cylinder 11, so that the raw sand can pass through the screen 111 into the mixing cylinder 30 after being ground. The screen 111 is constructed as a perforated mesh plate with the same thickness as the wall of the cylinder 11, so that the screen 111 has a high strength, so that the ground sand can be discharged outward through the screen 111.

[0033] Furthermore, a material equalizing bin 13 is provided on the outer wall of the cylinder 11 on the side facing the base 60 , and the material equalizing bin 13 is located on the outside of the screen 111 . A material equalizing net 131 is fixedly provided at the bottom of the material equalizing bin 13 , and the area of ​​the material equalizing net 131 is larger than that of the screen 111 .

[0034] In some embodiments, the cross-section of the equalizing bin 13 is fan-shaped, and the arc length of the connection between the equalizing bin 13 and the cylinder 11 is consistent with the arc length of the screen 111, so that the sand discharged from the screen 111 can be discharged into the equalizing bin 13. Correspondingly, the area of ​​the equalizing net 131 in the equalizing bin 13 is larger than the area of ​​the screen 111, so that the sand discharged from the screen 111 can be diffused over a larger area and discharged from the equalizing net 131 into the mixing barrel 30, so that the sand is more dispersed and evenly discharged into the mixing barrel 30, and is easier to be evenly mixed with the auxiliary materials.

[0035] Furthermore, multiple screens 111 are arranged along the axial direction, and the multiple screens 111 are distributed below the second grinding plate 122. Multiple groups of guide plates 132 are provided in the material equalization bin 13, which are used to evenly diffuse the raw sand at the screens 111 to the material equalization net 131, so that the sand discharged from the multiple screens 111 is evenly dispersed to the material equalization net 131, and discharged into the mixing barrel 30 through the material equalization net 131.

[0036] In some embodiments, the guide plate 132 is constructed as a plurality of fan-shaped plates, and the guiding direction of the fan-shaped plates is directed from the outlet of the screen 111 to the plate surface of the material distribution net 131. Since the guiding direction of the second grinding plate 122 is in the opposite direction, more ground sand is gathered here. The screen 111 is arranged below the second grinding plate 122, which makes it easier to discharge the ground sand from the screen 111. The guide plate 132 evenly distributes the sand discharged from the screen 111 to the material distribution net 131, and then discharges it into the mixing barrel 30, so that the sand entering the mixing barrel 30 is more dispersed in the axial direction, which is conducive to the uniform mixing of the sand and auxiliary materials.

[0037] Furthermore, an auxiliary material conveying cylinder 14 is provided on the outer wall of the cylinder body 11, and the auxiliary material conveying cylinder 14 is arranged parallel to the cylinder body 11 in the horizontal direction. An auxiliary material conveying cavity 140 is provided inside the auxiliary material conveying cylinder 14, and a plurality of equidistantly distributed discharge pipes 15 are provided at the bottom of the auxiliary material conveying cylinder 14, and the discharge pipes 15 are connected to the auxiliary material conveying cavity 140, and the output end of the auxiliary material feed pipe 40 is connected to the auxiliary material conveying cavity 140.

[0038] In some embodiments, the auxiliary material delivery cylinder 14 is located on the outer wall of the cylinder 11 and inside the mixing cylinder 30, and the auxiliary material supply pipe 40 is connected with the cylinder 11 from the outside of the mixing cylinder 30, and the auxiliary material supply pipe 40 is connected with the auxiliary material delivery cavity 140 inside the auxiliary material delivery cylinder 14 through the interlayer channel arranged on the inner wall of the cylinder 11. In this way, the rotation of the mixing cylinder 30 on the outside of the cylinder 11 is not hindered, and the auxiliary material supply pipe 40 can deliver auxiliary materials into the auxiliary material delivery cylinder 14.

[0039] Furthermore, the auxiliary material conveyed by the auxiliary material feeding pipe 40 is a mixed liquid material. After the auxiliary materials are all pre-mixed according to a certain amount ratio, they are introduced into the mixing barrel 30 through multiple discharge pipes 15 at the bottom of the auxiliary material conveying barrel 14, wherein an electric heating wire 141 is also embedded on the surface wall of the auxiliary material conveying barrel 14, and the electric heating wire 141 is used to keep the auxiliary material conveying barrel 14 warm or heat it to position the liquid state of the auxiliary material. In this way, the auxiliary material can be added at multiple points in the axial direction of the mixing barrel 30, which is beneficial for the auxiliary material to be fully mixed with the sand material, thereby improving the mixing efficiency.

[0040] Furthermore, a bearing is installed at the connection between the mixing barrel 30 and the grinding barrel 10, so that the mixing barrel 30 can rotate on the outside of the grinding barrel 10, and the base 60 is provided with four driving rollers 50 distributed on both sides below the mixing barrel 30, and the base 60 is provided with a second motor 51 for driving the driving rollers 50 to rotate, so that the second motor 51 can drive the driving rollers 50 to drive the mixing barrel 30 to rotate.

[0041] Among them, only one of the four driving rollers 50 is linked to the second motor 51, and the driving roller 50 serves as a driving wheel to drive the mixing drum 30 to rotate, and the other three driving rollers 50 serve as auxiliary wheels to ensure the stability of the mixing drum 30 during the rotation process.

[0042] Furthermore, a plurality of mixing fins 31 are provided on the inner wall of the mixing barrel 30, which are centrally symmetrically distributed around the axis of the grinding barrel 10. The mixing fins 31 are detachably installed on the inner wall of the mixing barrel 30. The mixing barrel 30 is constructed as an arc-shaped plate, and the mixing fins 31 can drive the material to be fed in the axial direction. In this way, during the rotation of the mixing barrel 30, the sand material and auxiliary material entering the mixing barrel 30 will move circumferentially or parabolically in the internal space of the mixing barrel 30, and under the action of the mixing fins 31, they will be moved and mixed in the axial direction. In this way, the material has a large movement space during the internal mixing process of the mixing barrel 30, which can further improve the mixing efficiency. Moreover, since the material is gradually added to the mixing barrel 30, the energy consumption of the material mixing process is also relatively low.

[0043] Furthermore, more than two mixing fins 31 are provided along the axial direction, and the feeding directions of two adjacent mixing fins 31 are opposite, thus increasing the diversity of the mixing directions of the materials in the mixing barrel 30 and further promoting the full mixing of the materials.

[0044] In some embodiments, the mixing fins 31 are detachably mounted on the mixing barrel 30 so that the mixing fins 31 can be removed from the outside of the mixing barrel 30 to facilitate cleaning of the mixing fins 31 and the inside of the mixing barrel 30. One or more discharge windows 301 are provided on the end surface of the mixing barrel 30. After mixing is completed, the discharge windows 301 can be opened to discharge the internal material.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0046] The above description of the implementation mode is not restrictive, and the drawings show only one of the implementation modes, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the scope of protection.

Claims

1. A coated sand mixing device, characterized in that: include: A grinding cylinder (10) with its axis arranged horizontally, a grinding chamber (100) being provided inside the grinding cylinder (10), and a feeding cylinder (101) being fixedly provided on the outer wall thereof and communicating with the grinding chamber (100); A mixing cylinder (30) coaxially arranged on the outside of the grinding cylinder (10); An auxiliary material feeding pipe (40), the output end of which is connected to the grinding cylinder (10); A base (60) is arranged below the mixing cylinder (30), and a driving roller (50) is provided on the base (60) for driving the mixing cylinder (30) to rotate, so that the base (60) can rotate outside the grinding cylinder (10); The grinding cylinder (10) is used to grind raw sand and transport the ground raw sand into the mixing cylinder (30), and the auxiliary material feeding pipe (40) can quantitatively transport the auxiliary material into the mixing cylinder (30) through the grinding cylinder (10).

2. The coated sand mixing device according to claim 1, characterized in that: The grinding cylinder (10) comprises a cylinder body (11) and a grinding shaft (12) rotatably mounted in the cylinder body (11); a first motor (20) for driving the grinding shaft (12) to rotate is fixed to one end of the cylinder body (11); a plurality of groups of intermittently distributed grinding plates are fixed to the outer wall of the grinding shaft (12); and the plurality of groups of grinding plates are arranged in a spiral shape, so that the raw sand in the grinding chamber (100) can be driven by the grinding shaft (12) to be fed into the mixing cylinder (30).

3. The coated sand mixing device according to claim 2, characterized in that: The feeding direction in the grinding chamber (100) into the mixing barrel (30) is defined as a first direction, and the opposite direction is defined as a second direction. Each group of the grinding plates comprises a first grinding plate (121) and a second grinding plate (122). The feeding direction of the first grinding plate (121) is the first direction, and the feeding direction of the second grinding plate (122) is the second direction. The first grinding plates (121) and the second grinding plates (122) are sequentially distributed along the first direction, and the number of the first grinding plates (121) is greater than the number of the second grinding plates (122).

4. The coated sand mixing device according to claim 3, characterized in that: The spacing between the first grinding plate (121) or the second grinding plate (122) in the same group and the inner wall of the cylinder (11) decreases step by step along the first direction, and the arc of the first grinding plate (121) or the second grinding plate (122) in the circumferential direction is set between π and 2π.

5. The coated sand mixing device according to claim 3, characterized in that: A screen (111) is provided on the outer wall of the cylinder (11), so that the raw sand can pass through the screen (111) after being ground and enter the mixing cylinder (30). A material balancing bin (13) is provided on the outer wall of the cylinder (11) on a side facing the base (60), the material balancing bin (13) is located on the outer side of the screen (111), and a material balancing net (131) is fixedly provided at the bottom of the material balancing bin (13), and the area of ​​the material balancing net (131) is larger than the area of ​​the screen (111).

6. The coated sand mixing device according to claim 5, characterized in that: A plurality of the screens (111) are arranged along the axial direction, and the plurality of the screens (111) are distributed below the second grinding plate (122). A plurality of guide plates (132) are arranged in the material balancing bin (13) for uniformly diffusing the raw sand at the screens (111) onto the material balancing net (131), so that the sand discharged from the plurality of the screens (111) is uniformly dispersed onto the material balancing net (131), and discharged into the mixing barrel (30) through the material balancing net (131).

7. The coated sand mixing device according to claim 2, characterized in that: An auxiliary material conveying cylinder (14) is provided on the outer wall of the cylinder (11), the auxiliary material conveying cylinder (14) is arranged parallel to the cylinder (11) in the horizontal direction, an auxiliary material conveying cavity (140) is provided inside the auxiliary material conveying cylinder (14), and a plurality of equidistantly distributed discharge pipes (15) are provided at the bottom of the auxiliary material conveying cylinder (14), the discharge pipes (15) are in communication with the auxiliary material conveying cavity (140), and the output end of the auxiliary material supply pipe (40) is in communication with the auxiliary material conveying cavity (140).

8. The coated sand mixing device according to claim 1, characterized in that: A bearing is installed at the connection between the mixing barrel (30) and the grinding barrel (10), so that the mixing barrel (30) can rotate outside the grinding barrel (10); the base (60) is provided with four driving rollers (50) distributed on both sides below the mixing barrel (30); and the base (60) is provided with a second motor (51) for driving the driving rollers (50) to rotate, so that the second motor (51) can drive the driving rollers (50) to drive the mixing barrel (30) to rotate.

9. The coated sand mixing device according to claim 1, characterized in that: The inner wall of the mixing barrel (30) is provided with a plurality of mixing fins (31) which are centrally symmetrically distributed around the axis of the grinding barrel (10); the mixing fins (31) are detachably mounted on the inner wall of the mixing barrel (30); the mixing barrel (30) is constructed as an arc-shaped plate, and the mixing fins (31) can drive the material to be fed in an axial direction.

10. The coated sand mixing device according to claim 9, characterized in that: More than two mixing fins (31) are provided along the axial direction, and the feeding directions of two adjacent mixing fins (31) are opposite.

Images