Casting molding sand screening device capable of achieving cyclic utilization

Abstract

A casting molding sand screening device capable of being recycled comprises a machine box and a screen drum rotationally arranged in the machine box, a grinding drum is rotationally installed in the screen drum, a lining ring is fixedly arranged at the position, corresponding to the grinding drum, of the inner side wall of the screen drum, and a grinding face capable of being matched with the lining ring in a mutual grinding mode is arranged on the peripheral side face of the grinding drum. According to the molding sand screening device, the rotatable grinding cylinder is arranged in the screening cylinder, meanwhile, the lining ring matched with the grinding cylinder is arranged on the inner side wall of the screening cylinder, and in the process that molding sand blocks mixed and caked in molding sand are screened in the screening cylinder, small impurity particles can be directly screened out of the screening cylinder; and under the mutual rolling of the rolling cylinder and the lining ring, the caked molding sand blocks can be rolled into molding sand particles with single particle size and capable of achieving the recycling standard, so that the problem of subsequent secondary screening is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of metal casting, and in particular relates to a recycling casting sand screening device. Background Art

[0002] Molding sand's primary function in the foundry industry is to serve as the mold material that forms the outer shape of the casting. It withstands the impact of high-temperature molten metal and maintains a stable shape. It also possesses excellent air permeability to expel internal gases, protecting the casting from external interference, and ensuring casting quality and production efficiency. It is an indispensable key material in the casting process. During the casting process, molding sand is poured and used multiple times. After each use, it needs to be screened to remove impurities such as sand agglomerates, sintered blocks, and metal particles.

[0003] At present, when screening recycled molding sand, a screening device needs to screen out impurity particles with smaller particle sizes and sand agglomerate particles with larger particle sizes. The larger sand agglomerate particles need to be crushed a second time, and then reusable molding sand particles with suitable particle sizes are screened out. The above screening process cannot screen out the required molding sand particles in one go. In order to reduce the screening process and save time, the present invention proposes a screening device that can screen out the required molding sand in one go. 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 recycling foundry sand screening 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 recycling foundry sand screening device is proposed, comprising: Chassis, fixed to the top of the rack; A screen drum is rotatably arranged inside the chassis; A rolling drum is rotatably installed inside the screen drum, a liner is fixedly provided on the inner wall of the screen drum corresponding to the rolling drum, and a rolling surface that can grind and cooperate with the liner is provided on the circumferential side of the rolling drum.

[0006] Furthermore, the screen cylinder includes a first cylinder, a second cylinder and a third cylinder distributed in sequence along the material flow direction, the sieve holes on the first cylinder, the second cylinder and the third cylinder have the same aperture, and the sieve hole density on the third cylinder is greater than the sieve hole density on the first cylinder and the second cylinder, and the axis of the screen cylinder forms an angle of 5°~10° with the horizontal plane.

[0007] Furthermore, the first cylinder body includes a first mesh cylinder portion and a first annular cylinder portion, and the first mesh cylinder portion is provided at both ends of the first annular cylinder portion; the second cylinder body includes a second mesh cylinder portion and a second annular cylinder portion, and the second mesh cylinder portion is provided at both ends of the second annular cylinder portion; the liner includes a first liner and a second liner, and the first liner and the second liner are fixedly arranged on the inner side walls of the first annular cylinder portion and the second annular cylinder portion, respectively.

[0008] Furthermore, two rolling drums are provided on the inner side of the screen drum, and the rolling surfaces on the two rolling drums are respectively distributed on the inner sides of the first liner and the second liner, and the distance between the rolling surface and the first liner is twice the distance between the rolling surface and the second liner.

[0009] Furthermore, the front and rear ends of the frame are respectively provided with a second motor and a third motor for driving the two rollers to rotate, and the driving speed of the second motor is lower than the driving speed of the third motor.

[0010] Furthermore, a guide surface is provided on the side of the rolling drum facing the feed end of the screen drum, and a guide surface is provided on the side of the rolling drum facing the discharge end of the screen drum. The rolling surface is located between the guide surface and the guide surface. A scraper plate is fixed on the outer wall of the guide surface, and the scraper plate slides in contact with the inner wall of the screen drum.

[0011] Furthermore, the first cylinder and the second cylinder include stainless steel cylinders, and the sieve holes are provided on the cylinder walls of the stainless steel cylinders, and the third cylinder includes a sieve woven from stainless steel wires.

[0012] Furthermore, the sieve holes are provided on the walls of the first mesh cylinder part and the second mesh cylinder part, the first liner and the second liner are screwed onto the first annular cylinder part and the second annular cylinder part respectively, the inner walls of the first liner and the second liner are provided with tooth grooves, and the outer wall of the rolling surface is fixed with grinding teeth that cooperate with the tooth grooves.

[0013] Furthermore, the length ratio of the first cylinder to the second cylinder is one, and the length ratio of the second cylinder to the third cylinder is less than or equal to one.

[0014] Furthermore, both ends of the sieve drum are fixed with sieve drum rings, and a driving wheel is provided on the frame corresponding to the sieve drum ring. The driving wheel and the sieve drum ring are in contact with each other, and a first motor for driving the driving wheel to rotate is fixed on the frame.

[0015] Beneficial effects: The present invention arranges a rotatable rolling drum inside the screen drum and a lining ring cooperating with the rolling drum on the inner side wall of the screen drum. When the mixed and agglomerated molding sand blocks in the molding sand are screened inside the screen drum, the smaller impurity particles therein will be directly screened out to the outside of the screen drum. The agglomerated molding sand blocks can be ground into molding sand particles of a single particle size that meets the recycling standard under the mutual rolling of the rolling drum and the lining ring, thereby avoiding the problem of subsequent secondary screening. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the internal structure of a recycling foundry sand screening device proposed in an embodiment of the present invention; Figure 2 A schematic diagram of the three-dimensional structure of a screen drum according to an embodiment of the present invention; Figure 3 A schematic diagram of a half-section structure of a screen drum according to an embodiment of the present invention; Figure 4 A schematic diagram of the internal structure of the screen drum proposed in an embodiment of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the screen drum in the chassis proposed in an embodiment of the present invention.

[0017] Among them, 01, frame; 02, driving wheel; 03, first motor; 04, screen drum ring; 05, second motor; 051, first rotating shaft; 06, third motor; 061, second rotating shaft; 07, third rotating shaft; 10, chassis; 20, chip bucket; 30, screen drum; 301, rolling channel; 31, first cylinder; 311, first mesh cylinder part; 312, first annular cylinder part; 32, second cylinder; 321, second mesh cylinder part; 322, second annular cylinder part; 33, third cylinder; 40, rolling drum; 41, guide surface; 42, rolling surface; 43, guide surface; 44, scraper plate; 50, lining; 51, first lining; 52, second lining.

[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 following will clearly and completely describe the technical solutions in the embodiments of the present invention 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 "upper", "lower", "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, and 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 cannot be understood as limitations on the embodiments.

[0021] In the foundry industry, molding sand is recycled. During the casting process, molding sand is poured and used many times. This practice of recycling molding sand helps to reduce production costs, reduce waste emissions, and improve resource utilization efficiency. However, the current recycling screening process of molding sand requires crushing large agglomerated molding sand after screening, and then screening it a second time. This method not only has cumbersome screening steps, but also wastes time. Therefore, an embodiment of the present invention provides a recycling foundry sand screening device, which aims to solve the screening process of recycling molding sand at one time, so as to achieve the purpose of reducing steps and saving time. The device mainly includes a chassis 10 and a screen drum 30.

[0022] like Figure 1 As shown, the chassis 10 is fixed to the top of the frame 01, and the screen drum 30 is rotatably arranged inside the chassis 10. Generally, the frame 01 is welded with a steel structure to form a frame that plays a supporting and stabilizing role. The chassis 10 is spliced with steel plates and profiles to form a rectangular box. At the same time, a chip discharge bucket 20 is provided at the bottom of the chassis 10, which can collect and discharge the waste residue screened by the screen drum 30. The closed space formed by the chassis 10 can prevent the dust from being dispersed into the working environment during the screening of the molding sand by the screen drum 30. The feed end of the screen drum 30 is connected to the discharge port of the conveyor, and the discharge end of the screen drum 30 is connected to the molding sand recovery device. After the screen drum 30 screens out impurities in the molding sand, it retains recyclable molding sand particles.

[0023] Furthermore, a screen drum ring 04 is fixedly provided at both ends of the screen drum 30, a driving wheel 02 is provided on the frame 01 corresponding to the screen drum ring 04, the driving wheel 02 and the screen drum ring 04 are in contact with each other, and a first motor 03 for driving the driving wheel 02 to rotate is fixedly provided on the frame 01.

[0024] Among them, the screen drum ring 04 can be made of stainless steel, and the outside can be covered with plastic or rubber material to increase friction. The two screen drum rings 04 corresponding to the front and rear ends of the screen drum 30 on the frame 01 are provided with a total of four driving wheels 02, and at least one of the driving wheels 02 is connected to the output end of the first motor 03, so that the first motor 03 can drive one of the driving wheels 02 to rotate, thereby driving the screen drum 30 to rotate, so that the screen drum 30 can screen the internal molding sand particles.

[0025] In addition, since the axis of the screen drum 30 is set at an angle of 5° to 10° with the horizontal plane, the molding sand material inside the screen drum 30 can be transported downward under the action of gravity during the rotation of the screen drum 30. In order to ensure the stability of the axial position of the screen drum 30 when it rotates, a groove is usually provided on the driving wheel 02, and a protruding limiting rib is provided on the corresponding screen drum ring 04, so that the driving wheel 02 can limit the movement of the screen drum ring 04 in the axial position while driving the screen drum 30 to rotate.

[0026] Furthermore, in order to crush the agglomerated molding sand entering the screen drum 30 into single particles of molding sand, a rolling drum 40 is rotatably installed inside the screen drum 30, and a liner 50 is fixedly provided on the inner wall of the screen drum 30 corresponding to the rolling drum 40, and the peripheral side surface of the rolling drum 40 is provided with a rolling surface 42 that can grind and cooperate with the liner 50.

[0027] In this way, when the mixed and agglomerated molding sand blocks in the molding sand are screened inside the screen drum 30, the smaller impurity particles will be directly screened out to the outside of the screen drum 30. The agglomerated molding sand blocks can be ground into single molding sand particles under the mutual rolling of the rolling drum 40 and the lining ring 50, avoiding the problem of subsequent secondary screening.

[0028] like Figure 2 and Figure 3 As shown, the screen drum 30 includes a first drum body 31, a second drum body 32 and a third drum body 33 which are sequentially distributed along the material flow direction.

[0029] Among them, the first cylinder 31 includes a first net cylinder part 311 and a first ring cylinder part 312, and the first net cylinder part 311 is provided at both ends of the first ring cylinder part 312; the second cylinder 32 includes a second net cylinder part 321 and a second ring cylinder part 322, and the second net cylinder part 321 is provided at both ends of the second ring cylinder part 322.

[0030] In some embodiments, the first cylinder 31 and the second cylinder 32 include stainless steel cylinders, and sieve holes are provided on the cylinder wall of the stainless steel cylinder at positions corresponding to the first mesh cylinder portion 311 and the second mesh cylinder portion 321, and there are no sieve holes designed at positions corresponding to the first annular cylinder portion 312 and the second annular cylinder portion 322 on the cylinder wall of the stainless steel cylinder, so that the strength of the annular cylinder portion is greater than the strength of the mesh cylinder portion, and the third cylinder 33 includes a screen woven with stainless steel wire, so that the sieve holes on the third cylinder 33 are more dense than the sieve holes on the first cylinder 31 and the second cylinder 32.

[0031] Furthermore, the liner 50 includes a first liner 51 and a second liner 52 , and the first liner 51 and the second liner 52 are fixedly disposed on the inner side walls of the first annular portion 312 and the second annular portion 322 , respectively.

[0032] Correspondingly, two rolling drums 40 are provided inside the screen drum 30 , and the rolling surfaces 42 of the two rolling drums 40 are respectively distributed on the inner sides of the first lining ring 51 and the second lining ring 52 .

[0033] In this way, when the molding sand entering the screen drum 30 is screened, the molding sand will first contact the front roller 40, wherein a rolling channel 301 for the molding sand to pass through is formed between the rolling surface 42 and the liner 50. When the molding sand passes through the rolling channel 301, the agglomerated molding sand blocks will be rolled by the rolling surface 42 and the first liner 51 to become molding sand particles. The crushed molding sand blocks will be screened in the process of flowing to the rear side, thereby achieving a one-time crushing and screening process, reducing processing steps and saving time.

[0034] In some embodiments, in order to crush the agglomerated molding sand blocks in steps to reduce the damage of the molding sand particles, the distance between the rolling surface 42 and the first liner 51 is twice the distance between the rolling surface 42 and the second liner 52, wherein the distance between the rolling surface 42 and the second liner 52 is the particle size range of the molding sand particles, generally set at about 5 mm, and the distance between the rolling surface 42 and the first liner 51 is set at about 10 mm. The molding sand blocks first pass through a 10 mm rolling channel 301 to roll large pieces of molding sand into small pieces. The rolled molding sand continues to be screened in the second cylinder 32, and then passes through a 5 mm rolling channel 301 to roll small pieces of molding sand into molding sand particles. Subsequently, it enters the third cylinder 33 for screening to screen out small metal particle impurities in the molding sand, and finally discharges recyclable molding sand particles from the discharge port side of the sieve cylinder 30.

[0035] Furthermore, the sieve holes on the first cylinder 31 , the second cylinder 32 and the third cylinder 33 have the same aperture, and the sieve hole density on the third cylinder 33 is greater than the sieve hole density on the first cylinder 31 and the second cylinder 32 .

[0036] Since there are no large pieces of molding sand in the third cylinder 33, there are only molding sand particles used in composite recycling and impurity particles smaller than the standard. The sieve hole density on the third cylinder 33 woven with stainless steel wire is relatively large, which makes it easy to screen out small-sized impurity particles mixed in the molding sand particles. In the first cylinder 31 and the second cylinder 32, firstly, in order to ensure that the first cylinder 31 and the second cylinder 32 have sufficient strength, the rolling surface 42 and the liner 50 can cooperate with each other to crush the molding sand lumps into molding sand particles.

[0037] like Figure 1 and Figure 4 As shown, the front and rear ends of the frame 01 are respectively provided with a second motor 05 and a third motor 06 for driving the two rollers 40 to rotate. The driving speed of the second motor 05 is lower than the driving speed of the third motor 06.

[0038] Among them, the output ends of the second motor 05 and the third motor 06 are both provided with a pulley transmission mechanism (a reduction mechanism composed of a conveyor belt and a transmission wheel), wherein the first rotating shaft 051 is fixedly connected to the roller 40 at the front end, and the second motor 05 drives the roller 40 to rotate at a first speed through the first rotating shaft 051, and the second rotating shaft 061 is fixedly connected to the roller 40 at the rear end, and the third motor 06 drives the roller 40 to rotate at a second speed through the second rotating shaft 061, wherein the second speed is greater than the first speed. In order to ensure the stability of the rotation of the two rollers 40, a third rotating shaft 07 is provided between the rollers 40, and one end of the third rotating shaft 07 is fixedly connected to the rear roller 40, and the other end is rotatably connected to the front roller 40. In this way, the two rollers 40 can rotate at different speeds inside the screen drum 30.

[0039] The rotation speed of the front roller 40 is relatively slow, while the rotation speed of the rear roller 40 is relatively fast. The roller 40 with a slower rotation speed is suitable for crushing large blocks of molding sand. After the volume of the molding sand blocks passes through the 10mm crushing channel 301, the size of the molding sand blocks is uniform, and the crushing efficiency is higher when the roller 40 with a subsequent rotation speed is used.

[0040] like Figure 4 and Figure 5 As shown, a guide surface 41 is provided on the side of the rolling drum 40 facing the feed end of the screen drum 30, and a guide surface 43 is provided on the side of the rolling drum 40 facing the discharge end of the screen drum 30. The rolling surface 42 is located between the guide surface 41 and the guide surface 43. A scraper plate 44 is fixed on the outer wall of the guide surface 43, and the scraper plate 44 slides in contact with the inner wall of the screen drum 30.

[0041] In this way, the molding sand entering the screen drum 30 contacts the conical guide surface 41 on the roller 40 in advance, guiding the molding sand blocks or molding sand particles of different sizes to the rolling surface 42. The rolling surface 42 is also designed as a conical surface to accommodate the molding sand blocks of different sizes. After the molding sand blocks and molding sand particles pass through the 10mm rolling channel 301, the larger molding sand blocks are rolled into molding sand blocks or molding sand particles of less than 10mm. At the same time, the small particles generated are also screened by the first mesh cylinder part 311 and the second mesh cylinder part 321. In addition, the subsequent molding sand blocks or molding sand particles below 10 mm continue to flow backward and come into contact with the roller 40 on the rear side, and are further crushed into molding sand particles with a uniform particle size of less than 5 mm. The small particle impurities generated in the crushing process are screened out by the second mesh cylinder 321 and the third cylinder 33. In this way, the screening and rolling of the molding sand can be completed in the screen cylinder 30, and the recyclable molding sand particles can be screened out at one time, which can reduce the subsequent rolling and secondary screening steps and save screening time.

[0042] Furthermore, sieve holes are provided on the walls of the first mesh tube portion 311 and the second mesh tube portion 321, and the density of the sieve holes close to the first liner 51 and the second liner 52 gradually decreases, so that the first cylinder 31 and the second cylinder 32 have sufficient strength in the stressed parts and have a certain ability to screen out small particles.

[0043] In some embodiments, the first liner 51 and the second liner 52 are screwed onto the first annular portion 312 and the second annular portion 322, respectively. Tooth grooves are provided on the inner walls of the first liner 51 and the second liner 52, and grinding teeth that cooperate with the tooth grooves are fixedly provided on the outer wall of the rolling surface 42. The rotation direction of the rolling drum 40 is opposite to the rotation direction of the screen drum 30. When the molding sand block passes through the rolling channel 301, it will be crushed into small pieces or molding sand particles by the cooperation of the grinding teeth and the tooth grooves that rotate against each other.

[0044] Furthermore, the length ratio of the first cylinder 31 and the second cylinder 32 is one. In this way, by setting two sections of cylinders and coordinating with secondary crushing, the agglomerated molding sand blocks are gradually crushed into molding sand particles. The length ratio of the second cylinder 32 and the third cylinder 33 is less than or equal to one. The length of the subsequent third cylinder 33 is set to be relatively long or the same, which can ensure that the small particle impurities produced after crushing can be screened out and the recyclable molding sand particles are retained.

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

[0046] The above description of the embodiment is non-limiting. The drawings show only one embodiment, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the invention, designs a similar structure and embodiment without inventiveness, they shall fall within the scope of protection.

Claims

1. A recycling foundry sand screening device, characterized in that: include: A chassis (10) is fixed to the top of the rack (01); A screen drum (30) is rotatably disposed inside the chassis (10); A rolling drum (40) is rotatably mounted inside the screen drum (30), a liner (50) is fixedly provided on the inner side wall of the screen drum (30) corresponding to the rolling drum (40), and a rolling surface (42) capable of grinding and cooperating with the liner (50) is provided on the circumferential side surface of the rolling drum (40).

2. The recycling foundry sand screening device according to claim 1, characterized in that: The sieve drum (30) comprises a first cylinder (31), a second cylinder (32) and a third cylinder (33) which are sequentially distributed along the material flow direction; the sieve holes on the first cylinder (31), the second cylinder (32) and the third cylinder (33) have the same aperture; the sieve hole density on the third cylinder (33) is greater than the sieve hole density on the first cylinder (31) and the second cylinder (32); and the axis of the sieve drum (30) forms an angle of 5° to 10° with the horizontal plane.

3. The recycling foundry sand screening device according to claim 2, characterized in that: The first cylinder (31) comprises a first net cylinder portion (311) and a first ring cylinder portion (312), and the first net cylinder portion (311) is provided at both ends of the first ring cylinder portion (312). The second cylinder (32) comprises a second net cylinder portion (321) and a second ring cylinder portion (322), and the second net cylinder portion (321) is provided at both ends of the second ring cylinder portion (322). The liner (50) comprises a first liner (51) and a second liner (52), and the first liner (51) and the second liner (52) are fixedly arranged on the inner side walls of the first ring cylinder portion (312) and the second ring cylinder portion (322), respectively.

4. The recycling foundry sand screening device according to claim 3, characterized in that: Two rolling drums (40) are provided inside the screen drum (30), and the rolling surfaces (42) on the two rolling drums (40) are respectively distributed on the inner sides of the first liner (51) and the second liner (52), and the distance between the rolling surface (42) and the first liner (51) is twice the distance between the rolling surface (42) and the second liner (52).

5. The recycling foundry sand screening device according to claim 4, characterized in that: The front and rear ends of the frame (01) are respectively provided with a second motor (05) and a third motor (06) for driving the two rollers (40) to rotate, and the driving speed of the second motor (05) is lower than the driving speed of the third motor (06).

6. The recycling foundry sand screening device according to claim 1, characterized in that: The roller (40) is provided with a guide surface (41) on the side facing the feed end of the screen drum (30), and a guide surface (43) on the side facing the discharge end of the screen drum (30). The rolling surface (42) is located between the guide surface (41) and the guide surface (43). A scraper plate (44) is fixedly provided on the outer wall of the guide surface (43), and the scraper plate (44) slides in contact with the inner wall of the screen drum (30).

7. The recycling foundry sand screening device according to claim 3, characterized in that: The first cylinder (31) and the second cylinder (32) comprise stainless steel cylinders, and the sieve holes are provided on the cylinder walls of the stainless steel cylinders. The third cylinder (33) comprises a sieve woven from stainless steel wire.

8. The recycling foundry sand screening device according to claim 7, characterized in that: The sieve holes are provided on the walls of the first mesh cylinder portion (311) and the second mesh cylinder portion (321); the first liner (51) and the second liner (52) are screwed onto the first annular cylinder portion (312) and the second annular cylinder portion (322), respectively; tooth grooves are provided on the inner walls of the first liner (51) and the second liner (52); and grinding teeth matching the tooth grooves are fixedly provided on the outer wall of the rolling surface (42).

9. The recycling foundry sand screening device according to claim 2, characterized in that: The length ratio of the first cylinder (31) to the second cylinder (32) is one, and the length ratio of the second cylinder (32) to the third cylinder (33) is less than or equal to one.

10. The recycling foundry sand screening device according to claim 1, characterized in that: Both ends of the sieve drum (30) are fixedly provided with sieve drum rings (04), a driving wheel (02) is provided on the frame (01) corresponding to the sieve drum ring (04), the driving wheel (02) and the sieve drum ring (04) are in contact with each other, and a first motor (03) for driving the driving wheel (02) to rotate is fixedly provided on the frame (01).

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