A magnetic separator for recycling foundry waste sand

Abstract

This utility model provides a magnetic separator for recycling foundry waste sand, including a feeding unit, a main casing, a spreading unit, and a magnetic separation unit. The feeding unit includes a feeding hopper and a double-roll crushing mechanism. The double-roll crushing mechanism includes a shell connected to the feeding end and the discharge end of the feeding hopper, and two counter-rotating rollers symmetrically arranged inside the shell. Multiple crushing teeth are distributed on the outer walls of both rollers, and the crushing teeth of the two rollers are staggered. The spreading unit is installed inside the main casing and includes a vibrating, inclined vibrating plate, with the higher side being the feeding end and the lower side being the discharge end. The discharge end of the double-roll crushing mechanism is located above the feeding end of the vibrating plate. The magnetic separation unit is installed inside the main casing and below the spreading unit. The bottom of the main casing is provided with a sand discharge hopper and an iron filings discharge hopper. The magnetic separator for recycling foundry waste sand described in this utility model can break up clumps and spread the material evenly, ensuring a loose and uniform feeding, effectively improving magnetic separation efficiency and optimizing the magnetic separation effect.

Description

Technical Field

[0001] This utility model belongs to the field of foundry waste sand recycling equipment, and in particular relates to a magnetic separator for foundry waste sand recycling. Background Technology

[0002] The foundry industry generates over 100 million tons of waste sand annually, of which ferromagnetic impurities (such as riser and gating debris, burrs, and iron oxide scale) account for 3-8%. These ferromagnetic impurities need to be removed during the foundry sand regeneration process. Currently, various magnetic separators with different structures are used to process the waste sand, separating ferrous and non-ferrous substances. However, due to the presence of residual resin and a certain degree of moisture in the foundry waste sand, the feed material clumps, and some iron filings cannot be magnetically separated due to the clumping. Furthermore, the waste sand layer is relatively thick during transport, resulting in incomplete removal of iron filings from the waste sand. Utility Model Content

[0003] In view of this, in order to solve the above-mentioned technical problems, this utility model proposes a magnetic separator for recycling foundry waste sand that can break up clumps, spread materials evenly, ensure loose and uniform feeding, and effectively improve magnetic separation efficiency and optimize magnetic separation effect.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] A magnetic separator for recycling foundry waste sand includes a feeding unit, a main casing, a spreading unit, and a magnetic separation unit.

[0006] The feeding unit includes a feeding hopper and a double-roll crushing mechanism; the double-roll crushing mechanism includes a shell connected to the feeding end of the feeding hopper and a double roller symmetrically arranged in the inner cavity of the shell and driven to rotate in opposite directions by a driving component; the outer walls of the double rollers are each distributed with a plurality of crushing teeth, and the crushing teeth of the two rollers are staggered.

[0007] The flattening unit is installed inside the main housing and includes a spring mounting seat installed on the inner wall of the main housing, a frame connected to the spring mounting seat, a vibrating plate installed on the frame, and a vibrating motor installed on the frame. The vibrating plate is inclined, with the higher side being the feed end and the lower side being the discharge end. The discharge end of the double-roll crushing mechanism extends into the main housing and is located above the feed end of the vibrating plate.

[0008] The magnetic separation unit is installed inside the main housing and located below the flattening unit. It includes a magnetic head wheel and a magnetic tail wheel that are driven to rotate in the same direction by a drive device, and a conveyor belt sleeved on the magnetic head wheel and the magnetic tail wheel. The discharge end of the vibrating plate is located above the conveyor belt near the magnetic tail wheel. The bottom of the main housing is provided with a sand discharge hopper below the magnetic head wheel, and the remaining part of the bottom of the main housing is provided with an iron filings discharge hopper.

[0009] The feed hopper receives waste sand conveyed from upstream; the two rollers of the double-roll crusher rotate in opposite directions at different speeds, with the crushing teeth arranged in an alternating pattern to shear the incoming clumps into loose particles; in the spreading unit, a vibrating motor drives a vibrating plate to vibrate, so that the loosened material is evenly spread into a thin layer under the combined action of gravity and inertia, and then fed into the magnetic separation unit below; in the magnetic separation unit, the magnetic head wheel and tail wheel rotate in the same direction, and the conveyor belt drives the material. When the material enters the magnetic head wheel, the non-magnetic material is thrown off the conveyor belt and falls into the sand discharge hopper below, while the magnetic material is attracted by the magnetic force and adheres to the conveyor belt. As the conveyor belt moves, the magnetic field strength weakens and falls into the iron filings discharge hopper below.

[0010] Furthermore, the feed hopper is equipped with an anti-bridging device, which includes a support frame located at the upper end of the inner cavity of the feed hopper, a rotating shaft vertically mounted on the support frame and rotatable, and a plurality of anti-bridging teeth on the rotating shaft; the lower end of the rotating shaft extends into the feed end of the outer shell.

[0011] The rotating shaft drives the arch-breaking teeth to continuously or intermittently agitate within the feed hopper, breaking up the "arch bridge" and ensuring continuous feeding.

[0012] Furthermore, the top of the rotating shaft is provided with a manual rotating handle or a drive motor for driving the rotating shaft to rotate.

[0013] The shaft can be rotated manually with a gap, or it can be driven by a drive motor.

[0014] Furthermore, it also includes a hot air drying unit, which includes an air inlet pipe installed on the main body housing, a horizontally longitudinally arranged main air supply pipe located above the vibrating plate and connected to the outlet of the air inlet pipe, and a plurality of hot air nozzles distributed on the main air supply pipe; the hot air delivered by the hot air nozzles is blown against the direction of sand flow.

[0015] The air inlet pipe is connected to an external industrial waste heat or electric heater. Multiple hot air nozzles blow air downwards against the direction of sand flow, forming an "air wall" that causes the moisture on the surface of the particles to evaporate rapidly. At the same time, it further disperses the slight agglomeration, achieving secondary loosening and preventing wet sand clumps and sticking to the rollers.

[0016] Furthermore, the hot air nozzles are positioned above one-third to two-thirds of the vibrating plate; the angle between the hot air nozzles and the vibrating plate is between 15 and 60°.

[0017] Furthermore, the magnetic separation unit also includes a scraper assembly, which is installed on the side wall of the main housing at a position corresponding to the magnetic separation tail wheel; the scraper assembly includes a spring base installed on the side wall of the main housing and a scraper installed on the spring base, and the scraper head end of the scraper scrapes the surface of the conveyor belt sleeved on the magnetic separation tail wheel.

[0018] The scraper makes elastic contact with the conveyor belt through a spring base, cleaning up fine iron filings adhering to the surface of the conveyor belt in real time and preventing secondary entrapment.

[0019] Compared with existing technologies, the magnetic separator for recycling foundry waste sand described in this utility model has the following advantages:

[0020] (1) The magnetic separator for recycling foundry waste sand described in this utility model has two processing steps before the magnetic separation unit: double roller crushing and vibrating spreading. This ensures that the agglomerated waste sand is fully crushed and evenly spread before entering the magnetic field, thus ensuring that the feed is loose and uniform, effectively improving the subsequent magnetic separation efficiency and optimizing the magnetic separation effect.

[0021] (2) The magnetic separator for recycling foundry waste sand described in this utility model adopts a hot air-vibration coordinated drying treatment method. Multiple hot air nozzles blow downwards at an angle against the sand flow direction to form a "wind wall" so that the surface moisture of the particles evaporates quickly. At the same time, it further disperses the slight agglomeration, achieves secondary loosening, and eliminates wet sand lumps and sticking to the rollers. Attached Figure Description

[0022] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0023] Figure 1 This is a schematic diagram of the internal structure of the magnetic separator for recycling foundry waste sand according to an embodiment of the present invention;

[0024] Figure 2 This is a top view of the internal structure of the feed hopper according to an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1-Feeding unit, 2-Main casing, 3-Laying unit, 4-Hot air drying unit, 5-Magnetic separation unit, 6-Feeding hopper, 7-Double roller crushing mechanism, 8-Outer casing, 9-Double rollers, 10-Crushing teeth, 11-Anti-bridging device, 12-Support frame, 13-Rotating shaft, 14-Arch breaking teeth, 15-Manual rotating handle, 16-Spring mounting seat, 17-Frame, 18-Vibrating plate, 19-Vibrating motor, 20-Air inlet pipe, 21-Main air supply pipe, 22-Hot air nozzle, 23-Magnetic separator head wheel, 24-Magnetic separator tail wheel, 25-Conveyor belt, 26-Scraper assembly, 27-Spring base, 28-Scraper, 29-Sand discharge hopper, 30-Iron scrap discharge hopper. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0028] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] like Figure 1 and 2 As shown, a magnetic separator for recycling foundry waste sand includes a feeding unit 1, a main casing 2, a spreading unit 3, a hot air drying unit 4, and a magnetic separation unit 5.

[0032] The feeding unit 1 includes a feeding hopper 6 and a double-roll crushing mechanism 7; the double-roll crushing mechanism 7 includes a housing 8 connected to the feeding end of the feeding hopper 6 and two rollers 9 symmetrically arranged in the inner cavity of the housing 8 and driven to rotate in opposite directions by a drive assembly; the outer walls of the two rollers 9 are each distributed with multiple crushing teeth 10, and the crushing teeth 10 of the two rollers are staggered; the feeding hopper 6 is provided with an anti-bridging device 11, which includes a support frame 12 located at the upper end of the inner cavity of the feeding hopper 6, a rotating shaft 13 vertically arranged on the support frame 12 and rotatable, and multiple anti-bridging teeth 14 on the rotating shaft 13; the lower end of the rotating shaft extends into the feeding end of the housing 8, and the top of the rotating shaft 13 is provided with a manual rotating handle 15;

[0033] The flat-laying unit 3 is installed inside the main body housing 2, including a spring mounting seat 16 installed on the inner wall of the main body housing 2, a frame 17 connected to the spring mounting seat 16, a vibrating plate 18 installed on the frame 17, and a vibrating motor 19 installed on the frame 17; the vibrating plate 18 is inclined, with the higher side being the feed end and the lower side being the discharge end, and the discharge end of the double-roll crushing mechanism 7 extends into the main body housing 2 and is located above the feed end of the vibrating plate 18;

[0034] The hot air drying unit 4 includes an air inlet pipe 20 installed on the main housing 2, a horizontally longitudinally arranged main air supply pipe 21 located above the vibrating plate 18 and connected to the outlet of the air inlet pipe 20, and multiple hot air nozzles 22 distributed on the main air supply pipe 21; the hot air nozzles 22 are distributed above one-third to two-thirds of the vibrating plate 18; the angle between the hot air nozzles 22 and the vibrating plate 18 is between 15° and 60°, and the hot air delivered by the hot air nozzles 22 is blown against the direction of sand flow;

[0035] The magnetic separation unit 5 is installed inside the main housing 2 and located below the flattening unit 3. It includes a magnetic head wheel 23 and a magnetic tail wheel 24 driven to rotate in the same direction by a drive device, a conveyor belt 25 sleeved on the magnetic head wheel 23 and the magnetic tail wheel 24, and a scraper assembly 26 installed on the side wall of the main housing 2 at the position corresponding to the magnetic tail wheel 24. The discharge end of the vibrating plate 18 is located above the conveyor belt 25 near the magnetic tail wheel 24. The scraper assembly 26 includes a spring base 27 installed on the side wall of the main housing 2 and a scraper 28 installed on the spring base 27. The scraper head end of the scraper 28 scrapes the surface of the conveyor belt 25 sleeved on the magnetic tail wheel 24. A sand discharge hopper 29 is provided at the bottom of the main housing 2 below the magnetic head wheel 23, and an iron filings discharge hopper 30 is provided in the remaining part of the bottom of the main housing 2.

[0036] The working process of the magnetic separator for recycling foundry waste sand described in this utility model is as follows:

[0037] Waste sand is poured into the feed hopper 6 by a belt conveyor. The rotating shaft 13 drives the arch-breaking teeth 14 to continuously or intermittently agitate within the feed hopper 6, breaking up the "arch bridge". The material enters the double-roll crushing mechanism 7, where the clumps are sheared into loose particles by the crushing teeth 10. The material falls onto the vibrating plate 18, which vibrates, causing the loosened material to spread evenly into a thin layer under the combined action of gravity and inertia. At the same time, the hot air nozzle 22 blows hot air in the opposite direction, forming a "wind wall" that evaporates the moisture on the particle surface, disperses slight agglomerations, and achieves secondary loosening. Subsequently, the material falls onto the conveyor belt 25. When the material enters the magnetic separator head wheel 23, non-magnetic materials are thrown off the conveyor belt 25 and fall into the sand discharge hopper 29 below, while magnetic materials are attracted by magnetism and adhere to the conveyor belt 25. As the conveyor belt 25 moves, the magnetic field strength weakens, and the material falls into the iron filings discharge hopper 30 below.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A magnetic separator for recycling foundry waste sand, characterized in that, Includes feeding unit, main housing, spreading unit, and magnetic separation unit; The feeding unit includes a feeding hopper and a double-roll crushing mechanism; the double-roll crushing mechanism includes a shell connected to the feeding end of the feeding hopper and a double roller symmetrically arranged in the inner cavity of the shell and driven to rotate in opposite directions by a driving component; the outer walls of the double rollers are each distributed with a plurality of crushing teeth, and the crushing teeth of the two rollers are staggered. The flattening unit is installed inside the main housing and includes a spring mounting seat installed on the inner wall of the main housing, a frame connected to the spring mounting seat, a vibrating plate installed on the frame, and a vibrating motor installed on the frame. The vibrating plate is inclined, with the higher side being the feed end and the lower side being the discharge end. The discharge end of the double-roll crushing mechanism extends into the main housing and is located above the feed end of the vibrating plate. The magnetic separation unit is installed inside the main housing and located below the flattening unit. It includes a magnetic head wheel and a magnetic tail wheel that are driven to rotate in the same direction by a drive device, and a conveyor belt sleeved on the magnetic head wheel and the magnetic tail wheel. The discharge end of the vibrating plate is located above the conveyor belt near the magnetic tail wheel. The bottom of the main housing is provided with a sand discharge hopper below the magnetic head wheel, and the remaining part of the bottom of the main housing is provided with an iron filings discharge hopper.

2. The magnetic separator for recycling foundry waste sand according to claim 1, characterized in that: The feed hopper is equipped with an anti-bridging device, which includes a support frame located at the upper end of the inner cavity of the feed hopper, a rotating shaft vertically mounted on the support frame and rotatable, and multiple anti-bridging teeth on the rotating shaft; the lower end of the rotating shaft extends into the feed end of the outer shell.

3. The magnetic separator for recycling foundry waste sand according to claim 2, characterized in that: The top of the rotating shaft is equipped with a manual rotation handle or a drive motor to drive the rotating shaft to rotate.

4. The magnetic separator for recycling foundry waste sand according to claim 1, characterized in that: It also includes a hot air drying unit, which includes an air inlet pipe installed on the main body housing, a horizontally longitudinally arranged main air supply pipe located above the vibrating plate and connected to the outlet of the air inlet pipe, and a plurality of hot air nozzles distributed on the main air supply pipe; the hot air delivered by the hot air nozzles is blown against the direction of sand flow.

5. The magnetic separator for recycling foundry waste sand according to claim 4, characterized in that: The hot air nozzles are located above one-third to two-thirds of the vibrating plate; the angle between the hot air nozzles and the vibrating plate is between 15° and 60°.

6. The magnetic separator for recycling foundry waste sand according to claim 1, characterized in that: The magnetic separation unit further includes a scraper assembly, which is installed on the side wall of the main housing at a position corresponding to the magnetic separation tail wheel. The scraper assembly includes a spring base installed on the side wall of the main housing and a scraper installed on the spring base. The scraper head end of the scraper scrapes the surface of the conveyor belt sleeved on the magnetic separation tail wheel.

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