Waste sand recovery system

Abstract

The present application relates to a waste sand recovery system, which relates to the technical field of precision casting. It comprises a feeding assembly, a screening machine and a collecting assembly, wherein the feeding assembly comprises a first conveying track and a second elevator, the second elevator being used to convey the waste sand on the first conveying track to the screening machine; the screening machine comprises a main body, a screen drum located in the main body and a driving member for driving the screen drum to operate, a feeding port is provided on one side of the main body, and a first discharge pipe, a second discharge pipe and a third discharge pipe are provided on the lower side of the main body in sequence in a direction away from the second elevator; the sizes of the waste sand discharged by the first discharge pipe, the third discharge pipe and the second discharge pipe decrease in sequence, and the collecting assembly is arranged below the second discharge pipe and the third discharge pipe; a second grinder is provided below the first discharge pipe, and the discharge pipe of the second grinder is connected to the interior of the second elevator; the waste sand recovery efficiency of the present application is relatively high.

Description

Technical Field

[0001] The present application relates to the technical field of precision casting, and in particular to a waste sand recovery system. Background Art

[0002] Investment casting, also known as lost wax casting, includes processes such as wax pressing, wax repairing, tree assembly, slurry dipping, wax melting, pouring molten metal and post-processing.

[0003] In the related art, lost wax casting is to use wax to make a wax mold of the parts to be cast, and then the wax mold is coated with mortar through a sizing machine, and then a floating sand bucket is used to stick the sand to the outer surface of the wax mold through a sand sprinkling process, and the slurry coating and sand sprinkling processes are repeated many times to finally form the required sand mold. After the sand mold is dried, it is placed in hot water to melt the internal wax mold. The sand mold with the melted wax mold is taken out and then baked into a ceramic mold. Once baked. Generally, a pouring port is left when making a sand mold, and then molten metal is poured into the pouring port. After cooling, the required parts are made, and then the sand mold is broken and the casting is taken out, and finally the molded casting is polished. After the casting is completed, the broken sand mold is usually broken into pieces, then ground, and then the ground waste sand is recycled.

[0004] Since harder sand fragments may require longer grinding time to reach the ideal particle size, while softer sand fragments may be ground into fine powder too quickly; therefore, the waste sand fragments may still be inconsistent in coarseness and fineness after grinding, resulting in the size of most of the recycled waste sand failing to meet the use requirements, affecting the recovery efficiency of sand mold fragments. There is room for improvement. Summary of the invention

[0005] The purpose of the present application is to provide a waste sand recovery system to solve the problem of low recovery efficiency of sand mold fragments in the above-mentioned related technologies.

[0006] The waste sand recovery system provided in this application adopts the following technical solution:

[0007] A waste sand recovery system comprises a feeding assembly, a screening machine and a collecting assembly, wherein the feeding assembly comprises a first conveying track and a second elevator, the second elevator being used to convey the waste sand on the first conveying track to the screening machine; the screening machine comprises a main body, a screen drum located in the main body and a driving member for driving the screen drum to operate, a feeding port is provided on one side of the main body, and a first discharge pipe, a second discharge pipe and a third discharge pipe are provided on the lower side of the main body in sequence in a direction away from the second elevator; the sizes of the waste sand discharged from the first discharge pipe, the third discharge pipe and the second discharge pipe are reduced in sequence, and the collecting assembly is arranged below the second discharge pipe and the third discharge pipe; a second grinder is provided below the first discharge pipe, and the discharge pipe of the second grinder is connected to the interior of the second elevator.

[0008] By adopting the above technical solution, the first conveying track injects the waste sand after preliminary grinding into the filling hopper on the second elevator. At the same time, the second elevator is used to transport the waste sand on the first conveying track to the screening machine, and then the screening machine is used to classify and screen the waste sand of different sizes. Finally, the qualified waste sand is collected by the collecting component, and the unqualified waste sand is re-grinded by the second grinder, and the waste sand after the second grinding is injected into the screening machine again through the second elevator for screening, so as to improve the recycling efficiency of the waste sand.

[0009] Optionally, the screen cylinder includes a primary screen sleeve, a screen and a fixed frame for supporting the screen, the driving member can drive the fixed frame to rotate around its own axis, and the cross-sectional outer diameter of the screen increases in the direction away from the feed port; the screen includes a fine screen portion located above the second discharge pipe and a coarse screen portion located above the third discharge pipe, and the primary screen sleeve is arranged above the second discharge pipe and located at the end of the screen close to the feed port.

[0010] By adopting the above technical scheme, due to the setting of the screen drum, the screen is supported by a fixed frame, and the fixed frame is driven to rotate by a driving member; during the operation of the screening machine, the waste sand injected into the screen drum is firstly screened by the primary screen sleeve, and unqualified waste sand directly falls from the first discharge pipe into the second grinder, and qualified waste sand falls into the screen; as the screen drum rotates, the waste sand is discharged from the second discharge pipe through the fine screen part and from the third discharge pipe through the coarse screen part according to its size, thereby realizing the screening process of the waste sand and improving the recovery efficiency of the waste sand.

[0011] Optionally, the fixed frame includes an intermediate rod, a plurality of support rods, a first fixed ring located at one end of the support rod, and a second fixed ring located at the other end of the support rod; one end of the plurality of support rods close to the feed port is commonly fixedly connected to the first fixed ring, and the other ends of the plurality of support rods are commonly fixedly connected to the second fixed ring; the diameter of the first fixed ring is smaller than the diameter of the second fixed ring, the intermediate rod, the first fixed ring and the second fixed ring are coaxially fixedly connected, and the screen fixing sleeve is arranged on the common outside of the plurality of support rods.

[0012] By adopting the above technical solution, due to the relative setting of the sizes of the first fixed ring and the second fixed ring, during the rotation of the screen drum, the waste sand can move along the inclination direction of the screen toward the direction close to the coarse screen part, so that the waste sand can be screened in sequence through the fine screen part and the coarse screen part; at the same time, since the screen drum is sleeved on the common outside of a plurality of support rods, during the rotation of the screen drum, the support rods can synchronously move the waste sand inside the screen, reducing the possibility of the waste sand always accumulating at the lower part of the screen drum, thereby further improving the recovery efficiency of the waste sand.

[0013] Optionally, the primary screening sleeve is a barrier net with the same mesh number as the coarse screening part, and the barrier net is arranged inside the screen, the opening of the barrier net faces the feed port and is connected to the inner opening of the first discharge pipe, and the cross-sectional diameter of the barrier net increases in the direction close to the feed port.

[0014] By adopting the above technical solution, due to the setting of the cross-sectional size of the barrier net, unqualified waste sand can slide into the first discharge pipe along the inclined direction of the barrier net, thereby realizing automatic discharge of unqualified waste sand and improving the performance of the screening machine.

[0015] Optionally, the collecting assembly includes two collecting buckets located below the second discharge pipe and the third discharge pipe, and a plurality of casters are provided on the bottom side of the collecting buckets.

[0016] By adopting the above technical solution, due to the coordinated arrangement of the collecting bucket and the casters, it is convenient to collect the waste sand after the screening is completed, and it is also convenient for the subsequent transportation of the waste sand.

[0017] Optionally, a fine grinding assembly is provided on the side of the first conveying track, and the fine grinding assembly includes a feed hopper, a second conveying track and a Raymond mill. The feed hopper is used to receive waste sand discharged from the second discharge pipe, and the second conveying track is used to transport the waste sand in the feed hopper to the Raymond mill for further grinding. A collecting piece for collecting the waste sand after grinding is provided on the side of the Raymond mill.

[0018] By adopting the above technical solution, due to the setting of the fine grinding component, the second conveying track is used to convey the waste sand discharged from the second discharge pipe into the feed hopper to the Raymond mill for further grinding, so that the waste sand after fine grinding can meet other needs, further improving the recycling efficiency of the waste sand.

[0019] Optionally, a second control member is provided on the side of the feed hopper, and the second control member is used to adjust the size of the discharge port of the feed hopper.

[0020] By adopting the above technical scheme, due to the setting of the second control component, the size of the discharge port on the feed hopper can be adjusted, thereby adjusting the discharge efficiency of the waste sand from the discharge port on the feed hopper to the second conveying track, that is, the size of the discharge port on the feed hopper can be adjusted according to the processing efficiency of the Raymond mill.

[0021] Optionally, the collecting member includes a collecting pipe connected to the upper discharge port of the Raymond mill and a blower for blowing the waste sand after grinding into the collecting pipe. A limiting sleeve and a storage bag are arranged below the limiting sleeve at the discharge port of the collecting pipe.

[0022] By adopting the above technical solution, due to the coordinated arrangement of the blower and the storage bag, after the Raymond mill finely grinds the waste sand, it is convenient to collect the finely ground waste sand, thereby improving the collection efficiency of the waste sand.

[0023] Optionally, an adjustment component is provided on the side of the limiting sleeve, and the adjustment component includes a baffle rotatably arranged inside the limiting sleeve and a first control component for driving the baffle to rotate, and the baffle is used to adjust the size of the opening connecting the limiting sleeve and the storage bag.

[0024] By adopting the above technical scheme, due to the coordinated arrangement of the first control member and the baffle, only when the waste sand inside the limiting sleeve accumulates to a certain amount and reaches a certain weight, the control force of the first control member on the baffle can be overcome, and then the baffle can be squeezed and rotated, so that the accumulated waste sand can fall into the storage bag from the lower end opening of the limiting sleeve; since the size of the waste sand after fine grinding is smaller, the possibility of the waste sand falling into the storage bag to enter the inside of the limiting sleeve again is reduced, thereby improving the collection efficiency of the storage bag for waste sand.

[0025] Optionally, a bag dust collection assembly is provided on the side of the collecting pipe, and the bag dust collection assembly includes a dust collection body, a dust collection pipe and a return pipe arranged on the blower, and the two ends of the dust collection pipe are respectively connected to the air inlet pipe on the blower and the end of the collecting pipe away from the Raymond mill, and the two ends of the dust collection pipe are respectively connected to the air outlet pipe of the blower and the dust collection body.

[0026] By adopting the above technical scheme, unqualified waste sand (larger than 200 meshes) after fine grinding is discharged from the collection pipe under the suction action of the blower, and then passes through the reflux pipe, the blower and the dust removal pipe in sequence, and is finally injected into the dust removal body, thereby realizing the collection of unqualified waste sand (larger than 200 meshes) and increasing the possibility of reducing the mixing of unqualified waste sand (larger than 200 meshes) with qualified waste sand after fine grinding.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. Due to the setting of the screen drum, a fixed frame is used to support the screen, and the fixed frame is driven to rotate by the driving member; during the operation of the screening machine, the waste sand injected into the screen drum is first screened by the primary screening sleeve, and unqualified waste sand falls directly from the first discharge pipe into the second grinder, and qualified waste sand falls into the screen. As the screen drum rotates, the waste sand is discharged from the second discharge pipe through the fine screen part and from the third discharge pipe through the coarse screen part according to its size, thereby realizing the screening process of the waste sand and improving the recovery efficiency of the waste sand.

[0029] 2. Since the screen drum is mounted on the common outside of several support rods, the support rods can synchronously move the waste sand inside the screen during the rotation of the screen drum, reducing the possibility of waste sand always accumulating at the bottom of the screen drum, thereby further improving the recovery efficiency of waste sand.

[0030] 3. Due to the setting of the fine grinding assembly, the second conveying track is used to convey the waste sand discharged from the second discharge pipe into the feed hopper to the Raymond mill for re-grinding, so that the waste sand after fine grinding can meet other needs and further improve the recycling efficiency of the waste sand. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0033] Figure 2 It is a partial structural diagram of the embodiment of the present application showing the installation and cooperation between the driving member and the main body;

[0034] Figure 3 It is a schematic cross-sectional structure diagram of the embodiment of the present application showing the installation and matching of the screen drum and the main body;

[0035] Figure 4 It is a schematic diagram of the exploded structure of the screen drum assembly distribution in the embodiment of the present application;

[0036] Figure 5 It is a schematic cross-sectional structure diagram of the installation and matching of the screen drum in the embodiment of the present application;

[0037] Figure 6 It is a partial structural schematic diagram of the installation and matching of the fine grinding assembly in the embodiment of the present application;

[0038] Figure 7 It is a partial structural diagram of the installation and matching of the second control member in the embodiment of the present application;

[0039] Figure 8 It is a partial structural diagram of the installation and coordination of the collecting member in the embodiment of the present application;

[0040] Fig. 9 It is a partial cross-sectional structural schematic diagram of the installation and matching of the adjustment component in the embodiment of the present application;

[0041] Fig.10 It is a partial structural schematic diagram of the installation and coordination of the bag dust removal assembly according to an embodiment of the present application.

[0042] In the figure, 1, feed assembly; 11, first elevator; 12, first conveying track; 13, second elevator; 2, screening machine; 21, main body; 211, feed port; 212, first discharge pipe; 213, second discharge pipe; 214, third discharge pipe; 22, screen cylinder; 221, primary screening sleeve; 2211, barrier net; 222, fixed frame; 2221, middle rod; 2222, support rod; 2223, first fixed ring; 2224, second fixed ring; 2225, vertical rod; 223, screen; 2231, fine screen part; 2232, coarse screen part; 23, driving member; 3, collecting assembly; 31, collecting bucket; 32, foot Wheel; 4. Second grinder; 5. Fine grinding assembly; 51. Feed hopper; 52. Second conveying track; 53. Raymond mill; 54. Second control member; 541. Blocking plate; 5411. Fixing hole; 542. Pulling rod; 543. First bolt; 55. Collecting member; 551. Collecting pipe; 552. Blower; 5521. Air inlet pipe; 5522. Air outlet pipe; 553. Limiting sleeve; 554. Storage bag; 6. Bag dust removal assembly; 61. Dust removal body; 62. Dust removal pipe; 63. Return pipe; 7. Adjustment assembly; 71. Baffle; 711. Rotating shaft; 72. First control member; 721. Crank arm; 722. Counterweight. DETAILED DESCRIPTION

[0043] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0044] Example:

[0045] Reference Figure 1 and Figure 2 A waste sand recovery system includes a feeding assembly 1, a screening machine 2 and a collecting assembly 3. The feeding assembly 1 includes a first elevator 11, a first conveying track 12 and a second elevator 13. The first elevator 11 and the second elevator 13 are conventional lifting devices. The upper surface of the conveyor belt of the first conveying track 12 is concave inwardly for limiting the conveyed objects. It is a conventional conveying structure driven by a motor, which will not be described in detail here.

[0046] The waste sand after preliminary grinding is transported to the top of the first conveying track 12 through the first elevator 11, and the first conveying track 12 injects the waste sand after preliminary grinding into the filling hopper on the second elevator 13. The second elevator 13 is used to transport the waste sand on the first conveying track 12 to the screening machine 2, and the waste sand is classified and screened by the screening machine 2, and finally the screened waste sand is collected by the collecting component 3.

[0047] Reference Figure 2 and Figure 3The screening machine 2 includes a main body 21, a screen drum 22 located in the main body 21, and a driving member 23 for driving the screen drum 22 to operate. The driving member 23 is a cooperative arrangement of a motor and a transmission chain, which will not be described in detail here. A corresponding feed port 211 is arranged on the side of the main body 21 close to the second elevator 13. The second elevator 13 injects waste sand into the interior of the screening machine 2 through the feed port 211 on the main body 21 through its own discharge pipe. At the same time, a first discharge pipe 212, a second discharge pipe 213 and a third discharge pipe 214 are arranged in sequence on the lower side of the main body 21 in a direction away from the second elevator 13.

[0048] After the waste sand is screened by the screening machine 2, it is discharged from the corresponding first discharge pipe 212, the second discharge pipe 213 and the third discharge pipe 214 according to different sizes; the sizes of the waste sand discharged from the first discharge pipe 212, the third discharge pipe 214 and the second discharge pipe 213 decrease successively, the first discharge pipe 212 is used to discharge waste sand less than 10 mesh, the third discharge pipe 214 is used to discharge waste sand of 10-16 mesh, and the second discharge pipe 213 is used to discharge waste sand greater than 16 mesh.

[0049] Refer to 2 and Figure 3 The collecting assembly 3 is arranged below the second discharge pipe 213 and the third discharge pipe 214, wherein the collecting assembly 3 includes two collecting buckets 31 located below the second discharge pipe 213 and the third discharge pipe 214, and four casters 32 are rotatably arranged on the bottom side of the collecting bucket 31; the waste sand is directly injected into the corresponding collecting bucket 31 after being discharged from the second discharge pipe 213 and the third discharge pipe 214; the waste sand (10-16 mesh) discharged from the third discharge pipe 214 can be directly used in the sand sprinkling process, and the waste sand (greater than 16 mesh) discharged from the second discharge pipe 213 is subsequently finely ground and used in the slurry coating process.

[0050] Reference Figure 2 and Figure 3 A second grinder 4 is provided below the first discharge pipe 212. The second grinder 4 is a conventional small-sized grinding device and will not be described in detail herein. The discharge pipe of the second grinder 4 is connected to the interior of the second elevator 13, that is, the waste sand discharged from the first discharge pipe 212 is subjected to secondary grinding by the second grinder 4 and then injected into the screening machine 2 again through the second elevator 13 for screening.

[0051] Reference Figure 4 and Figure 5 The screen drum 22 includes a primary screening sleeve 221, a screen 223 and a fixed frame 222 for supporting the screen 223. The driving member 23 can drive the screen drum 22 to rotate around its own axis. The outer diameter of the cross section of the screen 223 is along the direction away from the feed inlet 211 (see Figure 3 ) direction increases;

[0052] The screen 223 includes a screen located at the second discharge pipe 213 (see Figure 3 ) and the fine screen portion 2231 located above the third discharge pipe 214 (see Figure 3 ) The coarse screen part 2232 above the fine screen part 2231 has a mesh number greater than 16 meshes, and the mesh number of the coarse screen part 2232 is between 10 and 16 meshes; the primary screen sleeve 221 is fixedly arranged on the second discharge pipe 213 (see Figure 3 ) and located above the screen 223 near the feed port 211 (see Figure 3 ) end.

[0053] Reference Figure 4 and Figure 5 The primary screening set 221 is a barrier net 2211 with the same mesh number as the coarse screening part 2232. The barrier net 2211 is fixedly arranged inside the screen 223, and the opening of the barrier net 2211 faces the feed inlet 211 (see Figure 3 ) and communicates with the inner opening of the first discharge pipe 212, and the cross-sectional diameter of the barrier net 2211 is along the direction close to the feed port 211 (see Figure 3 ) direction, the screen 223 will drive the barrier net 2211 to rotate synchronously when it rotates, and qualified waste sand will fall into the screen 223 through the screen holes on the barrier net 2211, and unqualified waste sand will slide along the inner inclined surface of the barrier net 2211 to the first discharge pipe 212 (see Figure 3 )Inside.

[0054] Reference Figure 4 and Figure 5 The fixed frame 222 includes an intermediate rod 2221, four support rods 2222, a first fixed ring 2223 located at one end of the support rod 2222, and a second fixed ring 2224 located at the other end of the support rod 2222; one end of the four support rods 2222 close to the feed port 211 is fixedly connected to the first fixed ring 2223, and the other ends of the four support rods 2222 are fixedly connected to the second fixed ring 2224; the diameter of the first fixed ring 2223 is smaller than the diameter of the second fixed ring 2224, the two ends of the intermediate rod 2221 are coaxially fixedly connected to the first fixed ring 2223 and the second fixed ring 2224 respectively through four vertical rods 2225, and the screen 223 is fixedly sleeved on the common outside of the plurality of support rods 2222.

[0055] Reference Figure 6 A fine grinding assembly 5 is provided on the side of the first conveying track 12, wherein the fine grinding assembly 5 includes a feed hopper 51, a second conveying track 52 and a Raymond mill 53, the second conveying track 52 is installed below the first conveying track 12, and the first conveying track 12 and the second conveying track 52 are vertically cross-arranged; the upper surface of the conveyor belt of the second conveying track 52 is concave inwardly, which is used to limit the conveyed items, which is a conventional conveyor belt structure driven by a motor, and the Raymond mill 53 is a conventional grinding equipment, which will not be described in detail here;

[0056] The feed hopper 51 is used to receive the second discharge pipe 213 (see Figure 3 ) The second conveying track 52 is used to convey the waste sand in the feed hopper 51 to the Raymond mill 53 for re-grinding. The side of the Raymond mill 53 is provided with a collecting piece 55 for collecting the ground waste sand.

[0057] Reference Figure 6 and Figure 7 A second control member 54 is provided on the side of the feed hopper 51, and the second control member 54 is used to adjust the size of the discharge port of the feed hopper 51; the second control member 54 includes a baffle plate 541 rotatably arranged on the side of the feed hopper 51 and a traction rod 542 used to drive the baffle plate 541 to rotate, the baffle plate 541 is rotatably connected to the feed hopper 51 through a first bolt 543, and the baffle plate 541 can be fixed after the first bolt 543 is tightened, and a fixing hole 5411 is provided on the outer peripheral surface of the baffle plate 541 for the traction rod 542 to be inserted; after the user inserts the traction rod 542 into the fixing hole 5411, and then loosens the first bolt 543, and then controls the traction rod 542 to drive the baffle plate 541 to rotate around the axis of the first bolt 543, thereby adjusting the opening size of the discharge port on the feed hopper 51.

[0058] Reference Figure 8 and Fig. 9 The collecting member 55 includes a collecting pipe 551 connected to the upper discharge port of the Raymond mill 53 and a blower 552 for blowing the ground waste sand into the collecting pipe 551. At the same time, a limiting sleeve 553 and a storage bag 554 are fixedly arranged at the lower discharge port of the collecting pipe 551. After the waste sand is finely ground by the Raymond mill 53, under the action of the blower 552, qualified waste sand (200 mesh) is injected into the storage bag 554 after passing through the collecting pipe 551, and the qualified waste sand after fine grinding can be used again in the slurry coating process.

[0059] Reference Fig.10 A bag dust removal assembly 6 is provided on the side of the collection pipe 551. The bag dust removal assembly 6 includes a dust removal body 61, a dust removal pipe 62, and a return pipe 63 provided on the blower 552. The dust removal body 61 is a conventional bag dust removal structure, which will not be described in detail here.

[0060] The two ends of the return pipe 63 are respectively connected to the air inlet pipe 5521 on the blower 552 and the end of the collection pipe 551 away from the Raymond mill 53, and the two ends of the dust removal pipe 62 are respectively connected to the air outlet pipe 5522 of the blower 552 and the dust removal body 61. Unqualified waste sand (greater than 200 mesh) is discharged from the collection pipe 551 under the suction of the blower 552, and then passes through the return pipe 63, the blower 552 and the dust removal pipe 62 in sequence, and finally injected into the dust removal body 61.

[0061] Reference Figure 8 and Fig. 9 The side of the limiting sleeve 553 is provided with an adjustment component 7, wherein the adjustment component 7 includes a baffle 71 rotatably arranged inside the limiting sleeve 553 and a first control member 72 for driving the baffle 71 to rotate, and the baffle 71 is used to adjust the size of the opening connecting the limiting sleeve 553 and the storage bag 554;

[0062] The first control member 72 includes a crank arm 721 and a counterweight 722, wherein the baffle 71 is rotatably connected to the inner wall of the limiting sleeve 553 through the rotating shaft 711, and one end of the rotating shaft 711 passes through the limiting sleeve 553 and extends to the outside of the limiting sleeve 553, the crank arm 721 is fixedly connected to the outer end of the rotating shaft 711, and the counterweight 722 is arranged at the end of the crank arm 721 away from the rotating shaft 711;

[0063] Only when the waste sand inside the limiting sleeve 553 accumulates to a certain amount and reaches a certain weight can it overcome the gravity of the counterweight block 722, press down the baffle 71 and rotate it around the axis of the rotating shaft 711, so that the waste sand accumulated on the baffle 71 can fall into the storage bag 554 from the lower end opening of the limiting sleeve 553.

[0064] The implementation principle of the embodiment of the present application is:

[0065] The waste sand after preliminary grinding is transported to the top of the first conveying track 12 through the first elevator 11, and the first conveying track 12 injects the waste sand after preliminary grinding into the injection hopper on the second elevator 13. The second elevator 13 is used to transport the waste sand on the first conveying track 12 to the screening machine 2, and the waste sand is classified and screened by the screening machine 2;

[0066] The waste sand discharged from the first discharge pipe 212 is ground twice by the second grinder 4, and then injected into the screening machine 2 again for screening through the second elevator 13; the waste sand (10-16 mesh) discharged from the third discharge pipe 214 can be directly used in the sand sprinkling process, and the waste sand (greater than 16 mesh) discharged from the second discharge pipe 213 is subsequently finely ground by the Raymond mill 53 and used in the slurry coating process.

[0067] Unless otherwise defined, the terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The "first", "second", "third" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and other similar words do not indicate a quantitative limit, but indicate that there is at least one. "Including" or "comprising" and other similar words mean that the elements or objects appearing in front of "including" or "comprising" cover the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0068] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A waste sand recovery system, comprising a feeding assembly (1), a screening machine (2) and a collecting assembly (3), wherein the feeding assembly (1) comprises a first conveying track (12) and a second elevator (13), wherein the second elevator (13) is used to convey the waste sand on the first conveying track (12) to the screening machine (2); It is characterized in that The screening machine (2) comprises a main body (21), a screen drum (22) located in the main body (21), and a driving member (23) for driving the screen drum (22) to operate; a feed port (211) is provided on one side of the main body (21); a first discharge pipe (212), a second discharge pipe (213) and a third discharge pipe (214) are provided on the lower side of the main body (21) in a direction away from the second elevator (13); the sizes of waste sand discharged by the first discharge pipe (212), the third discharge pipe (214) and the second discharge pipe (213) are reduced in sequence; the collecting assembly (3) is arranged below the second discharge pipe (213) and the third discharge pipe (214); a second grinder (4) is provided below the first discharge pipe (212), and the discharge pipe of the second grinder (4) is connected to the inside of the second elevator (13); The screen drum (22) comprises a primary screening sleeve (221), a screen (223) and a fixed frame (222) for supporting the screen (223); the driving member (23) can drive the fixed frame (222) to rotate around its own axis; the cross-sectional outer diameter of the screen (223) increases in a direction away from the feed inlet (211); the screen (223) comprises a fine screen portion (2231) located above the second discharge pipe (213) and a coarse screen portion (2232) located above the third discharge pipe (214); the primary screening sleeve (221) is arranged above the second discharge pipe (213) and is located inside the end of the screen (223) close to the feed inlet (211); The fixing frame (222) comprises an intermediate rod (2221), a plurality of support rods (2222), a first fixing ring (2223) located at one end of the support rod (2222), and a second fixing ring (2224) located at the other end of the support rod (2222); one end of the plurality of support rods (2222) close to the feed port (211) is fixedly connected to the first fixing ring (2223), and the other ends of the plurality of support rods (2222) are fixedly connected to the second fixing ring (2224); the diameter of the first fixing ring (2223) is smaller than the diameter of the second fixing ring (2224); the intermediate rod (2221), the first fixing ring (2223) and the second fixing ring (2224) are coaxially fixedly connected, and the screen (223) is fixedly sleeved on the common exterior of the plurality of support rods (2222); The primary screening sleeve (221) is a barrier net (2211) having the same mesh number as the coarse screening portion (2232); the barrier net (2211) is arranged inside the screen (223); the opening of the barrier net (2211) faces the feed port (211) and is connected to the inner opening of the first discharge pipe (212); the cross-sectional diameter of the barrier net (2211) increases gradually in a direction approaching the feed port (211); A fine grinding assembly (5) is provided on the side of the first conveying track (12), and the fine grinding assembly (5) comprises a feed hopper (51), a second conveying track (52) and a Raymond mill (53), wherein the feed hopper (51) is used to receive waste sand discharged from the second discharge pipe (213), and the second conveying track (52) is used to transport the waste sand in the feed hopper (51) to the Raymond mill (53) for re-grinding, and a collecting member (55) for collecting the waste sand after grinding is provided on the side of the Raymond mill (53); The collecting member (55) comprises a collecting pipe (551) connected to the discharge port of the Raymond mill (53) and a blower (552) for blowing the waste sand after grinding into the collecting pipe (551); a limiting sleeve (553) and a storage bag (554) arranged below the limiting sleeve (553) are arranged at the discharge port of the collecting pipe (551); A bag dust removal assembly (6) is provided on the side of the collecting pipe (551), and the bag dust removal assembly (6) comprises a dust removal body (61), a dust removal pipe (62) and a return pipe (63) arranged on the blower (552), the two ends of the return pipe (63) are respectively connected to the air inlet pipe (5521) on the blower (552) and the end of the collecting pipe (551) away from the Raymond mill (53), and the two ends of the dust removal pipe (62) are respectively connected to the air outlet pipe (5522) of the blower (552) and the dust removal body (61).

2. A waste sand recovery system according to claim 1, characterized in that: The collecting assembly (3) comprises two collecting buckets (31) located below the second discharge pipe (213) and the third discharge pipe (214), and a plurality of casters (32) are provided on the bottom side of the collecting bucket (31).

3. A waste sand recovery system according to claim 1, characterized in that: A second control member (54) is provided on the side of the feed hopper (51), and the second control member (54) is used to adjust the size of the discharge port of the feed hopper (51).

4. A waste sand recovery system according to claim 1, characterized in that: An adjustment component (7) is provided on the side of the limiting sleeve (553), and the adjustment component (7) comprises a baffle (71) rotatably arranged inside the limiting sleeve (553) and a first control member (72) for driving the baffle (71) to rotate, and the baffle (71) is used to adjust the size of the opening connecting the limiting sleeve (553) and the storage bag (554).

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