Treatment device for treating old sand

Abstract

The present disclosure relates to a treatment apparatus for treating old sand, including a mechanical regeneration unit including a conveying device for conveying old sand and a plurality of impact elements for impacting the old sand to mechanically regenerate the old sand, the impact elements being arranged in a predetermined pattern in an old sand treatment module; a fluidization unit conveying pressurized air from below the mechanical regeneration unit to the old sand treatment module to blow up the old sand to fluidize the old sand; a dust removal unit drawing dust generated in the mechanical regeneration unit from above the mechanical regeneration unit via negative pressure; and a buffer filtration unit including a buffer container directly connected to an outlet of the mechanical regeneration unit, the buffer container receiving and storing regenerated sand treated by the mechanical regeneration unit, and a filtration unit arranged in the buffer container for filtering the regenerated sand before the regenerated sand is stored in the buffer container. The treatment apparatus can obtain regenerated sand of desired quality with a simplified process and high treatment efficiency.

Description

Technical Field

[0001] This disclosure generally relates to the technical field of recycling used foundry sand. More particularly, this disclosure relates to a processing apparatus for treating used sand. Background Technology

[0002] When using molding sand for component casting, a large amount of waste sand is generated. This waste sand contains residual resin and binders, and is therefore classified as hazardous waste that cannot be disposed of arbitrarily. Recycling and reusing this waste sand can not only significantly reduce pollution caused by it, but also lower production costs and improve the economic efficiency of enterprises.

[0003] However, existing used sand processing facilities generally suffer from problems such as complex processes, numerous procedures, large amounts of equipment, high energy consumption, and low production efficiency. This leads not only to high equipment purchase costs but also to high production costs. In some cases, the cost of regenerating used sand using existing facilities is even higher than the cost of purchasing new sand directly. This has led some companies to simply abandon their expensively purchased used sand processing facilities, resulting in serious waste and contradicting the current advocacy of energy conservation and environmental protection.

[0004] Therefore, there is a need to improve existing old sand processing equipment. Utility Model Content

[0005] The purpose of this disclosure is to solve one or more of the problems described above and others, or to achieve other additional advantages.

[0006] This disclosure provides a processing apparatus for treating used sand. The processing apparatus includes: a mechanical regeneration unit comprising a first conveying device for conveying used sand and a plurality of impact elements for impacting the used sand to mechanically regenerate it, the plurality of impact elements being arranged in a predetermined pattern within a used sand processing module; a fluidization unit that delivers pressurized air from below the mechanical regeneration unit into the used sand processing module to agitate and fluidize the used sand; a dust removal unit that extracts dust generated in the mechanical regeneration unit from above the mechanical regeneration unit via negative pressure; and a buffer filtration unit comprising: a buffer container directly connected to the outlet of the mechanical regeneration unit, the buffer container being configured to receive and store regenerated sand treated by the mechanical regeneration unit; and a filtration unit disposed within the buffer container for filtering the regenerated sand before it is stored in the buffer container.

[0007] By using the processing apparatus for treating old sand according to the present disclosure, at least one of the following requirements can be achieved: simplified processing procedures, improved processing efficiency, and reduced production costs.

[0008] According to some embodiments of this disclosure, the fluidization unit includes a blower.

[0009] According to some embodiments of this disclosure, the rotational speed of the blower is less than or equal to 2750 rpm.

[0010] According to some embodiments of this disclosure, the first conveying device includes a screw conveyor.

[0011] According to some embodiments of this disclosure, the rotational speed of the screw conveyor of the first conveying device is less than or equal to 350 revolutions per hour.

[0012] According to some embodiments of this disclosure, the dust removal unit includes an exhaust device that is in fluid communication with the mechanical regeneration unit via a suction pipe, wherein the exhaust device generates negative pressure in the suction pipe by suction.

[0013] According to some embodiments of this disclosure, the buffer container is configured as a buffer tank, and the filtration unit includes a filter screen disposed at an angle relative to the vertical direction within the buffer tank.

[0014] According to some embodiments of this disclosure, the filter screen is disposed at an angle between 30 and 60 degrees in the buffer tank.

[0015] According to some embodiments of this disclosure, the filter screen includes: a screen body having apertures through which regenerated sand falls into the buffer tank; two side plates perpendicular to the screen body, the two side plates being spaced apart from each other along the width direction of the screen body and extending parallel to each other along the length direction of the screen body; and a plurality of baffles discretely disposed on the screen body, the plurality of baffles being perpendicular to the screen body and angled relative to the two side plates, such that waste remaining on the screen body can flow along the plurality of baffles in a tortuous path from the upper end to the lower end of the screen body.

[0016] According to some embodiments of this disclosure, at least a portion of the plurality of baffles are at different angles relative to the two side plates.

[0017] According to some embodiments of this disclosure, at least a portion of the plurality of baffles are arranged discretely in a Z-shape, zigzag shape, or S-shape.

[0018] According to some embodiments of this disclosure, the downstream ends of the two side plates include inclined portions, and the inclined portions of the two side plates are inclined toward each other at a predetermined angle.

[0019] According to some embodiments of this disclosure, a waste pipe for discharging waste is provided on the outside of the buffer tank. The first end of the waste pipe leads to or is in fluid communication with the lower end of the filter screen, and the second end of the waste pipe, opposite to the first end, leads to or is in fluid communication with a waste bin.

[0020] According to some embodiments of this disclosure, the buffer container includes a sampling port for sampling the recycled sand in the buffer container for testing.

[0021] According to some embodiments of this disclosure, the sampling port is connected to a sampling tube, and a valve is provided between the sampling port and the sampling tube.

[0022] According to some embodiments of this disclosure, a sand-shooting tank is further provided at the lower part of the buffer tank, and the sand-shooting tank uses compressed air to transport the regenerated sand in the buffer tank to another storage container.

[0023] According to some embodiments of this disclosure, the mechanical regeneration unit further includes a mixing module disposed downstream of the used sand processing module for mixing used sand output from the used sand processing module with newly input sand.

[0024] According to some embodiments of this disclosure, the mechanical regeneration unit further includes a second conveying device for conveying new sand, the second conveying device including a screw conveyor.

[0025] According to some embodiments of this disclosure, the rotational speed of the screw conveyor of the second conveying device is less than or equal to 55 revolutions per hour.

[0026] According to some embodiments of this disclosure, the fluidization unit also delivers pressurized air from below the mechanical regeneration unit to the mixing module.

[0027] According to some embodiments of this disclosure, the plurality of impact elements includes four impact elements arranged in a two-row, two-column configuration, with fluidized old sand flowing along an S-shaped path through the four impact elements.

[0028] It should be noted that aspects of this disclosure described with respect to one embodiment can be included in other different embodiments, although these other different embodiments are not specifically described. In other words, features of all embodiments and / or any embodiments can be combined in any manner and / or combination, as long as they do not contradict each other. Attached Figure Description

[0029] Several aspects of this disclosure will be better understood after reading the following detailed description in conjunction with the accompanying drawings, in which:

[0030] Figure 1 This is a front view of a processing apparatus for processing old sand according to an embodiment of the present disclosure;

[0031] Figure 2 yes Figure 1 Top view of the processing device shown;

[0032] Figure 3 yes Figure 1 Side view of the processing device shown;

[0033] Figure 4a This is a perspective view of the waste sand treatment module and the mixing module of a waste sand treatment apparatus according to an embodiment of the present disclosure;

[0034] Figure 4b It's old sand. Figure 4a A schematic diagram showing fluidization in the old sand treatment module;

[0035] Figure 5 This is a perspective view of the buffer filtering unit of a processing apparatus according to an embodiment of the present disclosure;

[0036] Figure 6 This is a perspective view of the buffer filtering unit of a processing apparatus according to another embodiment of the present disclosure;

[0037] Figure 7a This is a perspective view of a filter screen according to an embodiment of the present disclosure;

[0038] Figure 7b yes Figure 7a A schematic diagram of the filter screen body shown;

[0039] Figure 7c yes Figure 7a A top view of the filter screen shown;

[0040] Figure 7d yes Figure 7a The diagram shows the arrangement of the filter screens in the buffer container.

[0041] It should be understood that the same reference numerals denote the same elements in all the accompanying drawings. For clarity, the dimensions of some features may be altered and they may not be drawn to scale. Detailed Implementation

[0042] The present disclosure will now be described with reference to the accompanying drawings, which illustrate several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure more complete and to fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments.

[0043] It should be understood that the terminology used in this specification is for describing specific embodiments only and is not intended to limit this disclosure. All terms used in this specification (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. For the sake of brevity and / or clarity, well-known functions or structures may not be described in detail.

[0044] Unless otherwise specified, the singular forms “a,” “the,” and “the” used in this specification include the plural forms. The terms “comprising,” “including,” and “containing” used in this specification indicate the presence of the claimed feature but do not exclude the presence of one or more other features. The term “and / or” used in this specification includes any and all combinations of one or more of the relevant listed items.

[0045] When a component is described in the specification as being "on", "attached" to, "connected" to, "joined" to, or "in contact" with another component, the component may be directly located on, attached to, connected to, joined to, or in contact with the other component, or there may be an intermediate component present.

[0046] In this specification, the terms "first," "second," "third," etc., are used for ease of explanation only and are not intended to be limiting. Any technical feature represented by "first," "second," "third," etc., is interchangeable.

[0047] In the specification, spatial relation terms such as "above," "below," "front," "back," "top," and "bottom" describe the relationship between one feature and another in the accompanying drawings. It should be understood that spatial relation terms include not only the orientation shown in the drawings but also the different orientations of the device during use or operation. For example, when the device in the drawings is inverted, a feature previously described as "below" other features can now be described as "above" other features. The device can also be oriented in other ways (rotated 90 degrees or in other orientations), in which case the relative spatial relationships will be explained accordingly.

[0048] Reference Figures 1 to 3The present invention illustrates a processing apparatus 1 for processing used sand according to an embodiment of the present disclosure. The used sand may be used sand generated during the casting process or used sand generated during other production processes.

[0049] The processing device 1 may include a mechanical regeneration unit 10, a fluidization unit 20, a dust removal unit 30, and a buffer filtration unit 40.

[0050] The mechanical recycling unit 10 may include a first conveying device for conveying the used sand to be processed and a plurality of impact elements 11 for impacting the used sand to mechanically recycle it. The first conveying device for conveying the used sand to be processed may be a screw conveyor (not shown). In some embodiments, the first conveying device for conveying the used sand to be processed may also include a weighing component or have a weighing function to weigh the used sand before conveying it. The impact elements 11 may be impact shields, such as... Figure 4a As shown. The mechanical regeneration unit 10 may include a used sand processing module 12. The plurality of impact elements 11 may be arranged in a predetermined pattern within the used sand processing module 12. For example, in Figure 4a In the illustrated embodiment, the plurality of impact elements 11 are four impact elements arranged in a two-row, two-column configuration in the waste sand treatment module 12. However, this disclosure is not limited to this. The mechanical regeneration unit 10 may include fewer or more impact elements 11, such as two, three, five, six, etc.

[0051] exist Figure 4a In the illustrated embodiment, the mechanical regeneration unit 10 further includes a mixing module 13 for mixing the old sand output from the old sand processing module 12 with a small proportion (e.g., less than or equal to 10%) of newly input new sand. The mixing module 13 may be located downstream of the old sand processing module 12 (along the sand flow direction) and may be in fluid communication with the old sand processing module 12. For the input of new sand, the mechanical regeneration unit 10 may also include a second conveying device (not shown) for conveying the new sand. The second conveying device for conveying the new sand may be a screw conveyor. In some embodiments, the second conveying device for conveying the new sand may also include a weighing component or have a weighing function to weigh the new sand before conveying it. By mixing the old sand processed by the old sand processing module 12 with a small proportion of newly input new sand, the quality of the processed regenerated sand can be improved. Of course, this disclosure is not limited to this. In some embodiments, the mechanical regeneration unit 10 may also not include the mixing module 13.

[0052] The fluidization unit 20 is configured to deliver pressurized air from below the mechanical regeneration unit 10 to the used sand treatment module 12 and optional mixing module 13 within the mechanical regeneration unit 10. The fluidization unit 20 can be used to blow up the used sand in the used sand treatment module 12, fluidizing it and causing it to impact the plurality of impact elements 11, such as... Figure 4b As shown. When old sand impacts the plurality of impact elements 11, the agglomerated old sand can be broken up, and the binders and other substances on the old sand can be broken into dust and separated from the sand particles. The old sand can flow from upstream to downstream of the old sand processing module 12 around the plurality of impact elements 11 in a tortuous flow path (e.g., a roughly S-shaped flow path). The fluidization unit 20 can also be used to blow up the old sand and new sand in the mixing module 13 to promote the mixing of the old sand and new sand.

[0053] like Figure 1 As shown, the fluidization unit 20 may include a blower 21. The blower 21 may be in fluid communication with the lower part of the used sand treatment module 12 and optional mixing module 13 of the mechanical regeneration unit 10 via a blower duct 22, thereby delivering pressurized air to the used sand treatment module 12 and optional mixing module 13.

[0054] The dust removal unit 30 is configured to draw dust generated in the mechanical regeneration unit 10 from above the mechanical regeneration unit 10 via negative pressure. The dust removal unit 30 may include an exhaust fan (not shown). The exhaust fan may be in fluid communication with the mechanical regeneration unit 10 (including its used sand treatment module 12 and optional mixing module 13) via a suction pipe 31. The exhaust fan generates negative pressure in the suction pipe 31 by suction. At least a portion of the suction pipe 31 may extend above the mechanical regeneration unit 10 to facilitate the suction of dust floating above the sand particles from above the mechanical regeneration unit 10.

[0055] Reference Figures 5 to 7d The buffer filtration unit 40 may include a buffer container 41 directly connected to the mechanical regeneration unit 10 and a filtration unit disposed in the buffer container (see...). Figure 7a The buffer container 41 can be configured as a buffer tank for receiving and storing (specifically, temporarily storing) the regenerated sand processed by the mechanical regeneration unit 10. The buffer tank can have any suitable shape, such as cylindrical, funnel-shaped, polyhedral, etc. A filtration unit is used to filter the regenerated sand before it is stored in the buffer container 41 to improve the quality of the regenerated sand.

[0056] The filtration unit may include a filter screen 42. (See reference...) Figures 7a to 7d The filter screen 42 may include a screen body 421. The screen body 421 may be flat and may include a length direction along its main extending direction and a width direction perpendicular to the length direction. For example... Figure 7bAs shown, the screen body 421 has apertures 422. The size of the apertures 422 is chosen such that regenerated sand can fall through the apertures 422 into the buffer tank, while waste particles larger than the regenerated sand are retained above the screen body 421. The apertures 422 can have various different shapes. Figure 7b In the diagram, eyelet 422 is shown as a square, but the shape of the eyelet can be circular, elliptical, rectangular, rhomboid, pentagonal, hexagonal, etc.

[0057] The filter screen 42 may also include two side plates 423 perpendicular to the screen body 421. The two side plates 423 are spaced apart from each other along the width direction of the screen body 421 and extend parallel to each other along the length direction of the screen body 421. The two side plates 423 have a certain height in a direction perpendicular to the screen body 421 (i.e., the height direction perpendicular to both the length and width directions of the screen body 421). The downstream ends of the two side plates 423 may include inclined portions 424. The inclined portions 424 of the two side plates 423 may be inclined at a predetermined angle to each other, so that the waste outlet between the downstream ends of the two side plates 423 has a reduced size. This increases the residence time of regenerated sand and waste on the screen body 421 of the filter screen 42, thereby achieving more efficient filtration and reducing the loss of regenerated sand. The inclination angle of the inclined portion 424 of each side plate 423 relative to the side plate may be, for example, between 10 degrees and 30 degrees, preferably 20 degrees.

[0058] The filter screen 42 may also include a plurality of baffles 425 discretely disposed on the screen body 421. In this disclosure, "discretely" is used to describe multiple components that are not connected to each other but are spaced apart by a certain distance. Figure 7a and Figure 7c As shown, the plurality of baffles 425 have a certain height in a direction perpendicular to the screen body 421 (i.e., the height direction perpendicular to both the length and width directions of the screen body 421). The height of the baffles 425 can be higher than the height of the two side plates 423. The plurality of baffles 425 can form the same or different angles relative to the two side plates 423. For example, in Figure 7c One baffle 425 is at a 90-degree angle relative to the two side plates 423 (i.e., perpendicular to the two side plates 423), and the other baffles 425 are at a 45-degree angle relative to the corresponding side plates 423. Of course, this disclosure is not limited to this, and the baffles 425 may have other suitable angles relative to the two side plates 423, such as angles between 30 and 60 degrees.

[0059] exist Figure 7a and Figure 7cIn the example shown, at least a portion of the plurality of baffles 425 are arranged discretely in a predetermined pattern. For example, the plurality of baffles 425 may be arranged discretely in a generally Z-shaped, zigzag, S-shaped, or other suitable shape. As mentioned above, "discretely" means that the plurality of baffles 425 are not connected to each other, but are spaced apart from each other by a certain distance, such as... Figure 7c As shown. Waste remaining on the screen body can flow from the upper end to the lower end of the screen body 421 along a tortuous path, either along the multiple baffles 425, through the gaps between the baffles 425, or by crossing some of the baffles 425 in the height direction. The tortuous path can increase the residence time of regenerated sand and waste on the screen body 421 of the filter screen 42, thereby achieving more efficient filtration and reducing the loss of regenerated sand.

[0060] Reference Figure 7d In embodiments of this disclosure, the filter screen 42 is disposed at an angle relative to the vertical direction within the buffer container 41, so that regenerated sand and waste on the screen body 421 flow from upstream to downstream of the filter screen 42 by gravity. Figure 7d In the illustrated embodiment, the filter screen 42 is inclined at a 45-degree angle within the buffer container 41. However, this disclosure is not limited to this. Depending on the filtration effect, the filter screen 42 may have other suitable angles; for example, the filter screen 42 may be inclined within the buffer container 41 at an angle between 30 and 60 degrees. The filter screen 42 may also be inclined within the buffer container 41 at a greater (e.g., greater than 60 degrees) or a smaller (e.g., less than 30 degrees) angle.

[0061] return Figure 5 In some embodiments, a waste conduit 411 for discharging waste may be provided on the outside of the buffer container 41, which is configured as a buffer tank. The first end (upper end) of the waste conduit 411 may lead to or be in fluid communication with the lower end of the filter screen 42 to facilitate the entry of waste into the waste conduit 411; and the second end (lower end) of the waste conduit 411 opposite to the first end leads to or is in fluid communication with a waste bin 412 to facilitate the discharge of waste in the waste conduit 43 into the waste bin 412.

[0062] Reference Figure 6In some embodiments, the buffer container 41 may include a sampling port 413. The recycled sand in the buffer container 41 can be sampled through the sampling port 413 to test the recycled sand, for example, to see if the recycled sand meets desired quality standards. A sampling tube 414 may be connected to the sampling port 413. A valve 415 may be provided between the sampling port 413 and the sampling tube 414 to control the opening and closing of the sampling port 413. In one embodiment, the valve 415 may be a knife valve. The valve 415 may be controlled by a rotary wheel 416. The valve can be opened or closed by manually rotating the rotary wheel 416.

[0063] In some embodiments, a sand-shooting tank 43 may also be provided at the lower part of the buffer container 41, which is configured as a buffer tank. The sand-shooting tank 43 can use compressed air to transport the regenerated sand in the buffer container 41 to another storage container 44 (e.g., Figures 1 to 3 (As shown), for long-term storage or subsequent use of recycled sand.

[0064] By means of the processing apparatus according to this disclosure, recycled sand of desired quality can be obtained with simplified procedures, higher processing efficiency, and therefore lower cost. Specifically, in the processing apparatus of this disclosure, the used sand, after being processed by the mechanical regeneration unit, is directly conveyed to the buffer filtration unit (i.e., the buffer container of the buffer filtration unit is directly connected to the outlet of the mechanical regeneration unit) for further filtration without any other intermediate processes, thus significantly improving processing efficiency and reducing processing costs. It has been verified that the recycled sand obtained after such processing of the used sand meets the requirements for reuse. In some cases, the obtained recycled sand and new sand can be mixed in a predetermined ratio and used in a new casting process.

[0065] In some embodiments, the rotational speed of the screw conveyor of the first conveying device for transporting used sand can be less than or equal to 350 rpm, preferably less than or equal to 330 rpm, and particularly, 315 rpm or less; the rotational speed of the blower of the fluidization unit can be less than or equal to 2750 rpm, preferably less than or equal to 2700 rpm. Compared with the prior art, the rotational speeds of both the screw conveyor and the blower are reduced. The inventors unexpectedly discovered that with such rotational speeds or combinations thereof, the quality of the recycled sand can be further improved. Experiments have shown that setting the rotational speeds of the screw conveyor and the blower within the aforementioned ranges can reduce the electrical conductivity of the recycled sand from 1886 μS / cm to 1226 μS / cm. The reduction in the electrical conductivity of the recycled sand means that the obtained recycled sand is processed cleaner and therefore has a higher processing quality. In an embodiment that includes a second conveying device for conveying new sand, the rotational speed of the screw conveyor of the second conveying device can be less than or equal to 55 rpm, preferably less than or equal to 50 rpm, and particularly, can be 49 rpm, which can also improve the processing quality of old sand.

[0066] Exemplary embodiments according to this disclosure have been described above with reference to the accompanying drawings. However, those skilled in the art will understand that various changes and modifications can be made to the exemplary embodiments of this disclosure without departing from the spirit and scope of this disclosure. All changes and modifications are included within the scope of protection of this disclosure as defined by the claims. This disclosure is defined by the appended claims, and equivalents of those claims are also included.

Claims

1. A processing apparatus (1) for processing old sand, characterized in that, The processing device includes: Mechanical regeneration unit (10), the mechanical regeneration unit includes a first conveying device for conveying old sand and a plurality of impact elements (11) for impacting the old sand to mechanically regenerate the old sand, the plurality of impact elements being arranged in a predetermined pattern in the old sand processing module (12); A fluidization unit (20) delivers pressurized air from below the mechanical regeneration unit to the old sand treatment module to blow up the old sand and fluidize it; Dust removal unit (30), which extracts dust generated in the mechanical regeneration unit from above the mechanical regeneration unit via negative pressure; and A buffer filtration unit (40) includes: a buffer container (41) directly connected to the outlet of the mechanical regeneration unit, the buffer container being configured to receive and store regenerated sand processed by the mechanical regeneration unit; and a filtration unit disposed in the buffer container for filtering the regenerated sand before it is stored in the buffer container.

2. The processing apparatus according to claim 1, characterized in that, The fluidization unit includes a blower (21).

3. The processing apparatus according to claim 2, characterized in that, The speed of the blower (21) is less than or equal to 2750 rpm.

4. The processing apparatus according to any one of claims 1 to 3, characterized in that, The first conveying device includes a screw conveyor.

5. The processing apparatus according to claim 4, characterized in that, The rotational speed of the screw conveyor of the first conveying device is less than or equal to 350 revolutions per hour.

6. The processing apparatus according to any one of claims 1 to 3, characterized in that, The dust removal unit includes an exhaust device, which is in fluid communication with the mechanical regeneration unit via a suction pipe (31), wherein the exhaust device generates negative pressure in the suction pipe by suction.

7. The processing apparatus according to any one of claims 1 to 3, characterized in that, The buffer container (41) is configured as a buffer tank, and the filtration unit includes a filter screen (42) which is disposed in the buffer tank at an angle relative to the vertical direction.

8. The processing apparatus according to claim 7, characterized in that, The filter screen (42) is inclined in the buffer tank at an angle between 30 and 60 degrees.

9. The processing apparatus according to claim 7, characterized in that, The filter screen includes: a screen body (421) having holes (422) through which regenerated sand falls into the buffer tank; two side plates (423) perpendicular to the screen body, the two side plates being spaced apart from each other along the width direction of the screen body and extending parallel to each other along the length direction of the screen body; and a plurality of baffles (425) discretely disposed on the screen body, the plurality of baffles being perpendicular to the screen body and at an angle relative to the two side plates, such that waste remaining on the screen body can flow along the plurality of baffles in a tortuous path from the upper end to the lower end of the screen body.

10. The processing apparatus according to claim 9, characterized in that, At least a portion of the baffles are at different angles relative to the two side plates.

11. The processing apparatus according to claim 9, characterized in that, At least a portion of the baffles are arranged discretely in a Z-shape, zigzag shape, or S-shape.

12. The processing apparatus according to claim 9, characterized in that, The downstream ends of the two side plates include inclined portions (424), which are inclined toward each other at a predetermined angle.

13. The processing apparatus according to claim 9, characterized in that, The buffer tank is provided with a waste pipe (411) for discharging waste. The first end of the waste pipe is connected to the lower end of the filter screen or is in fluid communication with it, and the second end of the waste pipe opposite to the first end is connected to a waste bin (412) or is in fluid communication with it.

14. The processing apparatus according to claim 7, characterized in that, The buffer container includes a sampling port (413) for sampling the recycled sand in the buffer container for testing.

15. The processing apparatus according to claim 14, characterized in that, The sampling port is connected to a sampling tube (414), and a valve (415) is provided between the sampling port and the sampling tube.

16. The processing apparatus according to claim 7, characterized in that, The lower part of the buffer tank is also provided with a sand-shooting tank (43), which uses compressed air to transport the regenerated sand in the buffer tank to another storage container (44).

17. The processing apparatus according to any one of claims 1 to 3, characterized in that, The mechanical regeneration unit also includes a mixing module (13), which is located downstream of the old sand processing module (12) and is used to mix the old sand output from the old sand processing module with the newly input new sand.

18. The processing apparatus according to claim 17, characterized in that, The mechanical regeneration unit also includes a second conveying device for conveying new sand, the second conveying device including a screw conveyor.

19. The processing apparatus according to claim 18, characterized in that, The rotational speed of the screw conveyor of the second conveying device is less than or equal to 55 revolutions per hour.

20. The processing apparatus according to claim 17, characterized in that, The fluidization unit also supplies pressurized air from below the mechanical regeneration unit to the mixing module.

21. The processing apparatus according to any one of claims 1 to 3, characterized in that, The plurality of impact elements includes four impact elements arranged in a two-row, two-column configuration, with the fluidized old sand flowing along an S-shaped path through the four impact elements.

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