Foundry waste sand recycling system and method

Abstract

The invention provides a foundry waste sand recycling system and method.The foundry waste sand recycling system comprises a first-stage crushing device, a second-stage crushing device and a sand mixing device, and a finished product old sand warehouse is used for storing old sand; the second-stage crushing device comprises a second crushing mechanism, a second lifting machine and a finished product old sand bin, the second lifting machine is used for lifting old sand in the second crushing mechanism to the finished product old sand bin in the vertical direction, and the finished product old sand bin is used for storing the old sand; and the sand mixing device comprises a new sand mechanism and a sand mixing machine, the finished product old sand warehouse is located above the sand mixing machine and used for conveying old sand to the sand mixing mechanism, and the new sand mechanism is used for conveying new sand to the sand mixing machine. Through cooperation of the first-stage crushing device, the second-stage crushing device and the sand mixing device, waste sand can be conveniently recycled to the maximum extent, the effects of resource recycling and pollution-free treatment of the casting waste sand are achieved, the situation that the waste sand occupies land resources is avoided, meanwhile, the situation that the environment is polluted by old sand can be avoided, and the environment protection effect is achieved. And the method is worthy of ecological and environment-friendly popularization and application in solid waste resource recycling and reusing.

Description

Technical Field

[0001] The present invention relates to the technical field of waste sand regeneration and treatment, and in particular to a system and method for recycling foundry waste sand. Background Art

[0002] The foundry industry is one of my country's basic industries. In recent years, my country's foundry industry has developed rapidly, with an annual cumulative output of tens of millions of tons of various castings, making it a major casting producer. The characteristics of my country's foundry industry are small scale, many foundry companies, backward process equipment, especially imperfect environmental protection equipment, and a large amount of foundry waste sand is inevitably produced during the casting production process.

[0003] At present, the discharge of foundry waste sand is increasing day by day. The existing storage and treatment not only occupies a large amount of land, but also exposes many serious environmental pollution problems:

[0004] 1. The long-term storage of foundry waste sand occupies a large amount of land resources, resulting in heavy land burden and lack of management planning by enterprises;

[0005] 2. The harmful components remaining in the waste sand of foundry enter the soil and water bodies through rainwater erosion and soaking, which will cause serious land pollution;

[0006] 3. Some fine particles contained in the foundry waste sand will spread into the atmosphere with the wind to form dust, becoming an important source of PM2.5;

[0007] 4. A considerable amount of organic pollutants such as coal powder and binders remain in the waste foundry sand, which will release a large amount of air pollutants such as SO2, VOX, NOX, etc. under the influence of the natural environment.

[0008] Summary of the invention / Summary of the invention

[0009] The main purpose of the present invention is to provide a system and method for recycling foundry waste sand, aiming to solve the technical problems in the prior art that foundry waste sand occupies land resources and easily pollutes the environment.

[0010] In order to solve the above technical problems, an embodiment of the present invention provides a foundry waste sand recycling system, the foundry waste sand recycling system comprising:

[0011] The primary crushing device comprises a first crushing mechanism, a first elevator and a used sand storage bin which are sequentially arranged in a transverse direction, wherein the first crushing mechanism is arranged near the bottom of the first elevator, the first elevator is used to vertically lift the used sand to the used sand storage bin, and the finished used sand storage bin is used to store the used sand;

[0012] The secondary crushing device comprises a second crushing mechanism, a second elevator and a finished product used sand storage, wherein the second crushing mechanism is connected to the bottom of the used sand storage, the second elevator is located between the second crushing mechanism and the finished product used sand storage in the horizontal direction, the second elevator is used to vertically lift the used sand in the second crushing mechanism to the finished product used sand storage, and the finished product used sand storage is used to store the used sand;

[0013] The sand mixing device comprises a new sand mechanism and a sand mixer, wherein the finished product old sand storehouse is located above the sand mixer and is used to transport old sand to the sand mixing mechanism, and the new sand mechanism is used to transport new sand to the sand mixer.

[0014] In an embodiment of the present invention, the first crushing mechanism includes a shakeout machine, a first feeder and a primary crusher which are connected in sequence vertically, the first feeder extends laterally, and one end of the first feeder is arranged corresponding to the bottom of the shakeout machine, and the other end is arranged corresponding to the top of the primary crusher, and the primary crusher is located above the bottom of the first elevator and is close to the first elevator laterally.

[0015] In an embodiment of the present invention, the second crushing mechanism includes a second feeder and a secondary crusher which are connected in sequence along the vertical direction, the second feeder extends laterally, and one end of the second feeder is arranged corresponding to the bottom of the finished used sand storage, and the other end is arranged corresponding to the top of the secondary crusher, and the secondary crusher is located above the bottom of the second body elevator.

[0016] In an embodiment of the present invention, the primary crusher is a jaw crusher;

[0017] and / or,

[0018] The secondary crusher is a four-roll hammer crusher.

[0019] In an embodiment of the present invention, the primary crushing device also includes a screening machine, which is installed on the top of the old sand storage tank and located below the top of the first elevator, and is used to screen the old sand transported by the first elevator to the old sand storage tank.

[0020] In an embodiment of the present invention, a recovery pipeline is connected between the screening machine and the sand shakeout machine, and the recovery pipeline is used to recover old sand from the sand shakeout machine.

[0021] In an embodiment of the present invention, the new sand mechanism includes a new sand hopper, a new sand feeder and a third elevator. The new sand feeder extends laterally, and one end of the new sand feeder is arranged corresponding to the bottom of the new sand hopper, and the other end is arranged corresponding to the bottom of the third elevator. The third elevator is located laterally between the sand mixer and the new sand feeder. The third elevator is used to vertically transport the new sand conveyed by the new sand feeder to the sand mixer.

[0022] In an embodiment of the present invention, the new sand mechanism further includes a new sand storage bin located on the top of the sand mixer, and the new sand storage bin is connected to the top of the third elevator and is used to store new sand.

[0023] The present invention also provides a method for recycling foundry waste sand, characterized in that the method for recycling foundry waste sand comprises:

[0024] The primary crushing device is used to perform primary crushing on the sand casting to obtain primary crushed old sand;

[0025] The primary crushed used sand is transported to the used sand storage tank by the first elevator;

[0026] Transporting the primary crushed used sand in the used sand storage to the second crushing mechanism;

[0027] The second crushing mechanism is used to perform secondary crushing on the primary crushed used sand to obtain finished used sand;

[0028] The finished used sand is transported to the finished used sand storage by the second lifting mechanism;

[0029] According to the old sand recovery ratio, the finished old sand in the finished old sand storage and the new sand in the new sand mechanism are transported to the sand mixing device and mixed.

[0030] In the embodiment of the present invention, the sand diameter of the primary crushed old sand is R, R≤25mm;

[0031] and / or,

[0032] The sand diameter size r of the finished used sand is r≤3mm.

[0033] Through the above technical scheme, the hood provided by the embodiment of the present invention has the following beneficial effects: the casting waste sand recycling system is arranged sequentially from back to front, and at the same time, in conjunction with the vertical layout of the first hoist and the second hoist, it can provide vertical and horizontal large storage space for the old sand storage and the finished product old sand storage, which can facilitate the subsequent use of old sand and realize the resource recycling of old sand for use as needed. The cooperation of the primary crushing device and the secondary crushing device can perform secondary crushing on the old sand, ensure the uniformity of the old sand crushing, so that the old sand can be reused to the maximum extent. At the same time, the sand mixing device can mix the old sand and the new sand in a certain proportion, which can ensure the quantitative production of the final casting product, and can avoid the situation where only the old sand is used to cause a high product defect rate. The present invention can facilitate the maximum recycling of waste sand through the cooperation of the primary crushing device, the secondary crushing device and the sand mixing device, so as to achieve the effect of resource recycling and pollution-free treatment of casting waste sand, avoid the waste sand from occupying land resources, and avoid the situation of environmental pollution of old sand, which is worthy of promotion and application in the recycling and reuse of solid waste resources and ecological environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 is a schematic structural diagram of a system for recycling waste foundry sand according to an embodiment of the present invention;

[0036] Figure 2 1 is a partial structural schematic diagram of a system for recycling waste foundry sand according to an embodiment of the present invention.

[0037] Description of Reference Numerals

[0038] Label Name Label Name

[0039] 100 Waste Foundry Sand Recycling System 9 Second Elevator

[0040] 1 Sand shakeout machine 10 Finished product old sand storage

[0041] 2 First feeder 11 Sand mixer

[0042] 3 Primary Crusher 111 Weighing Machine

[0043] 4 First elevator 12 New sand storage

[0044] 5 Screening machine 13 Third elevator

[0045] 6 Old sand storage 14 New sand feeder

[0046] 7 Second feeder 15 New sand hopper

[0047] 8 Secondary Crusher 200 with Sand Casting DETAILED DESCRIPTION

[0048] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0049] The present invention provides these embodiments to make the present invention thorough and complete, and fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of materials, numerical expressions and numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, rather than as limiting.

[0050] It should be noted that, in the description of the present invention, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0051] In addition, the words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" is not strictly perpendicular, but is within the tolerance range. "Parallel" is not strictly parallel, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0052] It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0053] All terms used in the present invention have the same meanings as those understood by ordinary technicians in the field to which the present invention belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0054] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0055] The hood according to the present invention will be described below with reference to the accompanying drawings.

[0056] like Figure 1 and Figure 2 As shown, in the embodiment of the present invention, the foundry waste sand recycling system 100 includes a primary crushing device, a secondary crushing device and a sand mixing device; the primary crushing device includes a first crushing mechanism, a first elevator 4 and a used sand storage 6 which are arranged in sequence in the horizontal direction, the first crushing mechanism is arranged near the bottom of the first elevator 4 and is used to perform primary crushing on the used sand, the first elevator 4 is used to lift the used sand to the used sand storage 6 vertically, and the finished product used sand storage 10 is used to store the used sand; the secondary crushing device includes a second crushing mechanism, a second elevator 9 and a finished product used sand storage 10, the second crushing mechanism includes a second crushing mechanism, a second elevator 9 and a finished product used sand storage 10, The mechanism is connected to the bottom of the old sand storage tank 6 and is used for secondary crushing of the old sand. The second hoist 9 is located laterally between the second crushing mechanism and the finished old sand storage tank 10. The second hoist 9 is used to vertically lift the old sand in the second crushing mechanism to the finished old sand storage tank 10. The finished old sand storage tank 10 is used to store old sand; the sand mixing device includes a new sand mechanism and a sand mixer 11. The finished old sand storage tank 10 is located above the sand mixer 11 and is used to transport old sand to the sand mixer 11. The new sand mechanism is used to transport the new sand to the sand mixer 11. The sand mixer 11 is used to mix the old sand and the new sand.

[0057] It can be understood that the foundry waste sand recycling system 100 in this embodiment is mainly used for the recycling of clay sand. The first elevator 4 can be a chain bucket elevator, which is suitable for conveying high-temperature old sand blocks. The first elevator 4 is provided with an anti-reversal device and a stall detection switch to detect the operation of the first elevator 4. The old sand storage 6 can be welded by a steel structure and a plate, and is mainly used to store the old sand screened by the vibrating screening machine 5. The second elevator 9 can be a chain bucket elevator, which is mainly used to lift the finished old sand crushed by the four-roll hammer crusher to the finished old sand storage 10. The finished old sand storage 10 can be welded by a steel structure and a plate, and is mainly used to store the finished old sand crushed by the four-roll hammer crusher after screening. The sand mixer 11 can adopt new structures and new materials such as a spring pressure device, a water adding device, collective lubrication, and a diabase cast stone guard plate, which play an important role in the quality of the molding sand, improving productivity, and increasing the service life.

[0058] In one embodiment, a weighing device 111 is provided at the bottom of the sand mixer 11. During the process of adding and mixing old sand and new sand, the mixing ratio can be controlled by the weighing device 111. In addition, after the weighing device 111 measures that the adding of materials into the sand mixer 11 is completed, water can be automatically added in a quantitative manner through a water adding device.

[0059] The foundry waste sand recycling system 100 in this embodiment is arranged sequentially from back to front, and cooperates with the vertical layout of the first hoist 4 and the second hoist 9, which can provide vertical and horizontal large storage space for the old sand storage 6 and the finished product old sand storage 10, which can facilitate the subsequent use of old sand and realize the resource reuse of old sand for use. The cooperation of the primary crushing device and the secondary crushing device can perform secondary crushing on the old sand, ensure the uniformity of the crushing of the old sand, so that the old sand can be reused to the maximum extent. At the same time, the sand mixing device can mix the old sand and the new sand in a certain proportion, which can ensure the quantitative production of the final casting product, and avoid the situation where the product defect rate is high due to the use of only old sand. In this embodiment, through the cooperation of the primary crushing device, the secondary crushing device and the sand mixing device, it is convenient to maximize the reuse of waste sand, achieve the effect of resource recycling and pollution-free treatment of foundry waste sand, avoid waste sand occupying land resources, and avoid the situation of environmental pollution of old sand, which is worthy of promotion and application in the recycling and reuse of solid waste resources and ecological environmental protection.

[0060] It should be noted that, in this embodiment, the top of the first elevator 4 can be higher than the top of the old sand storage 6, and the bottom of the first elevator 4 can be lower than the bottom of the first crushing mechanism. The top of the second elevator 9 can be higher than the top of the finished product old sand storage 10, and the bottom of the second elevator 9 can be lower than the bottom of the second crushing mechanism. It can facilitate the collection and transportation of materials from the first elevator 4 and the second elevator 9.

[0061] Specifically, the first crushing mechanism includes a shakeout machine 1, a first feeder 2 and a primary crusher 3 which are connected in sequence vertically. The first feeder 2 extends horizontally, and one end of the first feeder 2 is arranged corresponding to the bottom of the shakeout machine 1, and the other end is arranged corresponding to the top of the primary crusher 3. The primary crusher 3 is located above the bottom of the first elevator 4 and is close to the first elevator 4 in the horizontal direction. The shakeout machine 1 in this embodiment can be a vibrating shakeout machine 1, which can be composed of a vibrating body, a base, a resonance spring, a vibration motor and an electrical control. Two vibration motors are symmetrically installed on both sides of the vibrating body, and synchronous starting and braking are adopted. Under the action of the exciting force, the sand casting 200 on the vibrating body is constantly thrown up and dropped, and collides with the grid bed repeatedly, so that the sand mold is separated from the casting and the sand box. The first feeder 2 can be a clay sand feeder, which is installed below the vibrating shakeout machine 1 and supported by a bracket. It is mainly composed of a vibrating body, a base, a rubber spring, a vibration motor and the like. Under the action of the force generated by two vibration motors symmetrically installed at a certain angle, the sand blocks falling on the vibration body jump forward, thereby realizing the sand block transportation of the vibration sand shakeout machine 1, and the primary crusher 3 is used to perform primary crushing of the old sand.

[0062] The sand shaker 1 in this embodiment can preliminarily screen and crush the old sand through the grid by vibrating and shaking the sand from top to bottom. By sequentially arranging from top to bottom, the old sand can be vibrated forward and fall with its own gravity, which can ensure the transmission efficiency of the old sand. The primary crusher 3 in this embodiment is located above the bottom of the first hoist 4, which can facilitate the first hoist 4 to collect and transport the old sand.

[0063] In one embodiment, the second crushing mechanism includes a second feeder 7 and a secondary crusher 8 connected in sequence vertically, the second feeder 7 extends in the horizontal direction, and one end of the second feeder 7 is arranged corresponding to the bottom of the finished used sand warehouse 10, and the other end is arranged corresponding to the top of the secondary crusher 8, and the secondary crusher 8 is located above the bottom of the second body elevator. The second feeder 7 in this embodiment can be a vibrating feeder, which is installed under the used sand storage 6 and supported by a bracket. Under the action of the force generated by two symmetrically installed vibration motors at a certain angle, the sand blocks falling on the vibration body jump forward, thereby realizing the material transportation in the vibration sand shaker 1. The used sand storage 6, the second feeder 7 and the secondary crusher 8 in this embodiment are arranged in sequence in the up and down direction, which can facilitate the falling and transmission of the used sand, and the secondary crusher 8 is used to perform secondary crushing of the used sand.

[0064] Optionally, the primary crusher 3 is a jaw crusher; and the secondary crusher 8 is a four-roller hammer crusher. The jaw crusher in this embodiment is located below the clay sand feeder, and the belt and pulley are driven by an electric motor to move the movable jaw up and down through the eccentric shaft. When the movable jaw rises, the angle between the toggle plate and the movable jaw becomes larger, thereby pushing the jaw plate to approach the fixed jaw plate, and at the same time, the material is crushed or split to achieve the purpose of crushing. It is mainly used to crush sand molds in which large pieces of clay sand are adhered together. Among them, the four-roller hammer crusher can be installed below the old sand storage 6, and the high extrusion force and shear force generated by the relative rotation of four high-strength wear-resistant crushing rollers are used to crush the material, and the old sand screened in the old sand storage 6 is crushed again. In this embodiment, the primary crushing can be achieved by the jaw crusher, and the secondary crushing can be achieved by the four-roller hammer crusher, ensuring that the old sand has a minimized particle size after being crushed twice, which can improve the resource utilization of the old sand.

[0065] It should be noted that the primary crushing device also includes a screening machine 5, which is installed on the top of the old sand storage 6 and located below the top of the first elevator 4. The screening machine 5 is used to screen the old sand transported by the first elevator 4 to the old sand storage 6. The screening machine 5 in this embodiment can be a vibrating screening machine, which can be provided with a screen box, a vibration motor, a vibration reduction system and a chassis. The exciting force generated by the vibrator is transmitted to the screen surface in the screen box through the screen box by external dragging of a vibration motor or an ordinary motor or self-vibration source drive. Since the exciting force generated by the vibrator is a longitudinal force, the screen box is forced to drive the screen surface to move forward and backward longitudinally, so that the old sand on the screen surface is thrown forward due to the exciting force. When falling, the old sand smaller than the screen hole passes through the screen and falls to the lower layer. The movement trajectory of the old sand on the screen surface is a parabolic motion. In this way, the old sand movement is repeated. After the old sand falls into the screen box from the discharge end of the first elevator 4, it can quickly move forward, loosen, and pass through the screen to complete the screening operation. The screening machine in this embodiment is located between the primary crusher 3 and the secondary crusher 8, which can avoid the situation where large particles of old sand clog the secondary crusher 8 and increase the service life of the foundry waste sand recycling system 100.

[0066] In one embodiment, a recovery pipe is connected between the screening machine 5 and the sand shakeout machine 1, and the recovery pipe is used to recover old sand from the sand shakeout machine 1. The screening machine 5 in this embodiment can also recover large particles of old sand, and recover them to the sand shakeout machine 1 through the recovery pipe, which can improve the recovery effect of old sand.

[0067] Specifically, the new sand mechanism includes a new sand hopper 15, a new sand feeder 14 and a third elevator 13. The new sand feeder 14 extends in the horizontal direction, and one end of the new sand feeder 14 is arranged corresponding to the bottom of the new sand hopper 15, and the other end is arranged corresponding to the bottom of the third elevator 13. The third elevator 13 is located between the sand mixer 11 and the new sand feeder 14 in the horizontal direction. The third elevator 13 is used to vertically transport the new sand transported by the new sand feeder 14 to the sand mixer 11. The new sand hopper 15 in this embodiment can be welded by a steel structure and a plate, and is mainly used to buffer the new sand material, and then transmit it to the third elevator 13 through the new sand feeder 14. The third elevator 13 can be a belt elevator, which is mainly used to lift the new sand material to the new sand storage 12. The new sand feeder 14 is installed below the new sand hopper 15 and supported by a bracket. Under the action of the force generated by the vibration motor, the new sand material falling on the vibration body jumps forward, thereby realizing the transportation of the new sand material. In this embodiment, the new sand hopper 15, the new sand feeder 14 and the third elevator 13 cooperate to make the new sand hopper 15 and the new sand feeder 14 at a lower height, which is convenient for the subsequent new sand adding operation and there is no need to lift the new sand too high during the adding operation.

[0068] It should be noted that the new sand mechanism also includes a new sand storage 12 located at the top of the sand mixer 11, and the new sand storage 12 is connected to the top of the third hoist 13 and is used to store new sand. The new sand storage 12 in this embodiment can be welded by a steel structure and a plate, and is mainly used to store new sand materials. The new sand storage 12 in this embodiment extends in the up and down direction and is located above the sand mixer 11. By installing the new sand storage 12 to store new sand, new sand can be taken and used at any time, and new sand can be reserved in advance when the new sand is running out. The top of the third hoist 13 can be higher than the top of the new sand storage 12, and the bottom of the new sand storage 12 can be lower than the bottom of the new sand feeder 14, which can facilitate the addition and transportation of new sand.

[0069] The present invention also provides a method for recycling foundry waste sand, characterized in that the method for recycling foundry waste sand comprises:

[0070] A primary crushing device is used to perform primary crushing on the sand casting 200 to obtain primary crushed old sand;

[0071] The primary crushed old sand is transported to the old sand storage 6 by the first elevator 4;

[0072] The primary crushed old sand in the old sand storage 6 is transported to the second crushing mechanism;

[0073] The second crushing mechanism is used to perform secondary crushing on the primary crushed used sand to obtain finished used sand;

[0074] The finished used sand is transported to the finished used sand storage 10 by the second elevator 9;

[0075] According to the old sand recovery ratio, the finished old sand in the finished old sand storage 10 and the new sand in the new sand mechanism are transported to the sand mixing device and mixed.

[0076] In one embodiment, the proportion of new sand can be 10% to 20%. The method for recycling foundry waste sand and realizing the resource utilization of foundry waste sand is specifically implemented as follows:

[0077] The sand casting 200 is broken into sand blocks of ≤60 mm by the sand shakeout machine 1;

[0078] Then it is sent to the primary crusher 3 through the first feeder 2;

[0079] The primary crusher 3 crushes the sand into pieces ≤ 25 mm to obtain primary crushed old sand;

[0080] Lifted by the first hoist 4 to the screening machine 5;

[0081] After being screened by the screening machine 5, it enters the old sand storage 6 for storage;

[0082] The primary crushed old sand in the old sand storage 6 is uniformly transported by the second feeder 7 hung at the sand outlet of the sand storage through the magnetic separator to the secondary crusher 8, where the waste sand blocks are crushed into sand particles less than 3 mm to obtain finished old sand;

[0083] The finished used sand then enters the finished used sand storage 10 through the second elevator 9;

[0084] New sand is poured into the new sand hopper 15 to buffer the material, and then transported to the third elevator 13 through the new sand feeder 14;

[0085] The third elevator 13 lifts new sand to the new sand storage 12;

[0086] Finished old sand and new sand are transported to the sand mixer 11 for mixing;

[0087] Then the sand mixer 11 discharges it to the sand box. After being compacted by the inertial vibrating table, the sand box is transferred by the driving equipment for pouring, completing the recycling of foundry waste sand, solving the problems of land resource occupation and lack of management planning, residual harmful components in the old sand invading the soil and water, fine particles in the foundry waste sand spreading into the atmosphere with the wind to form dust, and organic pollutants releasing a large amount of harmful gases, thereby achieving the effect of resource recycling and pollution-free treatment of foundry waste sand, which is worthy of promotion and application in the recycling and reuse of solid waste resources and ecological environmental protection. Specifically, the sand diameter size of the primary crushed old sand is R, R≤25mm; and the sand diameter size of the finished used sand is r, r≤3mm.

[0088] So far, various embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0089] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A foundry waste sand recycling system, characterized in that: The foundry waste sand recycling system (100) comprises: The primary crushing device comprises a first crushing mechanism, a first elevator (4) and a used sand storage bin (6) which are sequentially arranged in a transverse direction, wherein the first crushing mechanism is arranged near the bottom of the first elevator (4), the first elevator (4) is used to vertically lift the used sand to the used sand storage bin (6), and the finished used sand storage bin (10) is used to store the used sand; A secondary crushing device comprises a second crushing mechanism, a second elevator (9) and a finished product used sand storage (10), wherein the second crushing mechanism is connected to the bottom of the used sand storage storage (6), the second elevator (9) is located between the second crushing mechanism and the finished product used sand storage (10) in the horizontal direction, the second elevator (9) is used to vertically lift the used sand in the second crushing mechanism to the finished product used sand storage (10), and the finished product used sand storage (10) is used to store the used sand; The sand mixing device comprises a new sand mechanism and a sand mixer (11), wherein the finished product old sand storehouse (10) is located above the sand mixer (11) and is used to convey old sand to the sand mixer (11), and the new sand mechanism is used to convey new sand to the sand mixer (11).

2. The foundry waste sand recycling system according to claim 1, characterized in that: The first crushing mechanism comprises a shakeout machine (1), a first feeder (2) and a primary crusher (3) which are connected in sequence vertically, the first feeder (2) extending in the transverse direction, and one end of the first feeder (2) is arranged corresponding to the bottom of the shakeout machine (1), and the other end is arranged corresponding to the top of the primary crusher (3), and the primary crusher (3) is located above the bottom of the first elevator (4) and close to the first elevator (4) in the transverse direction.

3. The foundry waste sand recycling system according to claim 2, characterized in that: The second crushing mechanism comprises a second feeder (7) and a secondary crusher (8) which are connected in sequence along the vertical direction. The second feeder (7) extends in the horizontal direction, and one end of the second feeder (7) is arranged corresponding to the bottom of the finished used sand storage (10), and the other end is arranged corresponding to the top of the secondary crusher (8). The secondary crusher (8) is located above the bottom of the second body elevator.

4. The foundry waste sand recycling system according to claim 3, characterized in that: The primary crusher (3) is a jaw crusher; and / or, The secondary crusher (8) is a four-roller hammer crusher.

5. The foundry waste sand recycling system according to claim 2, characterized in that: The primary crushing device further comprises a screening machine (5), which is installed on the top of the old sand storage tank (6) and is located below the top of the first elevator (4), and is used to screen the old sand transported by the first elevator (4) to the old sand storage tank (6).

6. The foundry waste sand recycling system according to claim 5, characterized in that: A recovery pipe is connected between the screening machine (5) and the sand shakeout machine (1), and the recovery pipe is used to recover old sand from the sand shakeout machine (1).

7. The foundry waste sand recycling system according to any one of claims 1 to 6, characterized in that: The new sand mechanism comprises a new sand hopper (15), a new sand feeder (14) and a third elevator (13). The new sand feeder (14) extends in the transverse direction, and one end of the new sand feeder (14) is arranged corresponding to the bottom of the new sand hopper (15), and the other end is arranged corresponding to the bottom of the third elevator (13). The third elevator (13) is located between the sand mixer (11) and the new sand feeder (14) in the transverse direction. The third elevator (13) is used to vertically transport the new sand transported by the new sand feeder (14) to the sand mixer (11).

8. The foundry waste sand recycling system according to claim 5, characterized in that: The new sand mechanism also includes a new sand storage bin (12) located on the top of the sand mixer (11); the new sand storage bin (12) is connected to the top of the third elevator (13) and is used to store new sand.

9. A method for recycling foundry waste sand, characterized in that: The method for recycling waste foundry sand comprises: The primary crushing device is used to perform primary crushing on the sand casting (200) to obtain primary crushed old sand; The primary crushed old sand is transported to the old sand storage tank (6) by means of a first elevator (4); transporting the primary crushed old sand in the old sand storage (6) to the second crushing mechanism; The second crushing mechanism is used to perform secondary crushing on the primary crushed used sand to obtain finished used sand; The finished used sand is transported to the finished used sand storage (10) by means of a second elevator (9); According to the old sand recovery ratio, the finished old sand in the finished old sand storage (10) and the new sand in the new sand mechanism are transported to the sand mixing device and mixed.

10. The method for recycling waste foundry sand according to claim 1, characterized in that: The sand diameter of the primary crushed old sand is R, R≤25mm; and / or, The sand diameter size r of the finished used sand is r≤3mm.

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