Molding sand renovation system

Abstract

Relates to a molding sand renovating system in the technical field of old molding sand renovating and recycling, the molding sand renovating system comprises crushing equipment, continuous cleaning equipment, solid-liquid separation equipment and sand drying equipment, old molding sand is crushed into particles through the crushing equipment, then the particles are fed into the continuous cleaning equipment to be subjected to water washing, acid pickling neutralization and re-water washing in sequence, and then the particles are fed into the solid-liquid separation equipment; the separated water is returned to the water for pickling and neutralizing, and the separated molding sand particles are dried by the sand drying equipment to form a new sand finished product; concentrating and drying the alkali liquor obtained after the molding sand is washed and the salt liquor obtained after the molding sand is subjected to acid washing and neutralization, and then collecting solid particles; according to the molding sand renovating system, the continuity and high efficiency of cleaning and renovating can be guaranteed, and the environment-friendly requirement can be met.

Description

Technical Field

[0001] The invention relates to the technical field of renovation and reuse of old molding sand, in particular to a molding sand renovation system. Background Art

[0002] Sand molds are usually made of natural or synthetic materials (such as quartz sand) and one or more binders (such as water glass or chemical binders). After casting, the sand mold will be destroyed to remove the casting, so this is a consumable mold technology. Sand refurbishment is an important process in the foundry industry that aims to reprocess and reuse used sand to reduce costs and environmental impact. If broken molding sand is to be refurbished, the binder and some auxiliary agents on the old molding sand must be cleaned off. This requires facing two difficult problems. The first is how to design the cleaning and renovation process to ensure the continuity and efficiency of the cleaning and renovation. The second is the pollution and environmental protection problems faced during the cleaning process. With the development of smart equipment and the improvement of environmental protection requirements, the renovation technology of traditional molding sand can no longer meet the industrial requirements of the new era. Summary of the Invention

[0003] In order to overcome the deficiencies in the background technology and solve the existing technical problems, the present invention discloses a molding sand renovation system, which can ensure the continuity and efficiency of cleaning and renovation and meet environmental protection requirements.

[0004] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions: A molding sand renovation system includes a crushing device, a continuous cleaning device, a solid-liquid separation device and a sand drying device. After the old molding sand is crushed into particles by the crushing device, it is sent to the continuous cleaning device for water washing, acid washing and neutralization, and water washing again. Thereafter, it is sent to the solid-liquid separation device. The separated water is returned to the acid washing and neutralization water. The separated molding sand particles are then dried by the sand drying device to become new sand products. The alkali solution after washing the molding sand and the salt solution after acid washing and neutralization of the molding sand are concentrated and dried to collect solid particles.

[0005] Furthermore, the crushing equipment is set to three-stage crushing, with crushing specifications of 15 cm, 3 cm and below 6 mm respectively; the solid-liquid separation equipment adopts a vibrating screen, a cyclone separator or a filter press; the sand drying equipment adopts a rotary dryer or a belt dryer.

[0006] Furthermore, the continuous cleaning equipment includes a plurality of roller devices arranged side by side, and the roller devices include roller bodies with a material water inlet and a material water outlet respectively provided at the head and tail ends, and all the roller bodies are tilted so that the material water inlet of each roller body is higher than the material water outlet, and the adjacent two roller bodies are staggered head to tail so that the material water inlet of the rear roller body is lower than the material water outlet of the front roller body; a permeable material conveying inclined plate is mounted at the tail end of each roller body, and the high end plate surface of the material conveying inclined plate is correspondingly located below the material water outlet of the corresponding roller body, and the low end plate surface of the material conveying inclined plate extends to above the material water inlet of the adjacent roller body.

[0007] Furthermore, a screw feeder is mounted at the head end of the drum body, the lower end surface of the corresponding feed inclined plate extends to the feed port of the screw feeder, and the discharge end of the screw feeder corresponds to the material and water inlet of the drum body.

[0008] Furthermore, baffles are provided on the high end edge and both side edges of the upper surface of the conveying inclined plate, and the conveying inclined plate is composed of an upper layer of permeable cloth and a lower layer of metal mesh.

[0009] Furthermore, a liquid collecting tank is provided below the feed inclined plate.

[0010] Furthermore, a plurality of baffle groups are provided in the drum body at axial intervals, each baffle group comprises two annular baffles spaced side by side, and a plurality of grinding bodies are provided between the corresponding two annular baffles, and the outer edges of the annular baffles are sealed and fixed to the inner wall of the drum body; a plurality of lifting plates are provided between two adjacent baffle groups, and between the end face of the drum body and the corresponding baffle group. The inner wall of the drum body is evenly distributed along the circumference of the drum body, and the plate surface of the lifting plate is fixed vertically to the inner wall of the drum body.

[0011] Furthermore, the alkali liquid drying equipment includes a drying device, a mixing device, a primary belt conveyor mechanism and a secondary belt conveyor mechanism; the mixing device includes a mixing tank body and a screw conveyor mechanism, the mixing tank body is equipped with a mechanical stirring mechanism, the top of the mixing tank body is provided with an alkali liquid inlet and an alkali material inlet, the bottom of the mixing tank body is provided with a mixing outlet corresponding to the feed inlet of the screw conveyor mechanism, and the water content of the wet alkali at the mixing outlet of the mixing tank body is not higher than 10%; the drying device includes a rolling drum with a wet material inlet and a dry material outlet respectively provided at both ends, and the rolling drum is tilted so that the wet material inlet is higher than the dry material outlet; An annular partition is provided in the rolling drum, the outer edge of which is fixed to the inner wall of the rolling drum. A plurality of crushed material balls are provided in the inner cavity of the rolling drum between the annular partition and the dry material outlet, and a heating component is provided on the outer wall of the rolling drum between the annular partition and the wet material inlet; the conveying head end of the first-level belt conveyor mechanism is located below the dry material outlet, and a unloading station is provided on one side of the first-level belt conveyor mechanism, the conveying tail end of the first-level belt conveyor mechanism is correspondingly located above the alkali material inlet, the conveying head end of the second-level belt conveyor mechanism is located below the discharge port of the spiral conveying mechanism, and the conveying tail end of the second-level belt conveyor mechanism is correspondingly close to above the wet material inlet.

[0012] Furthermore, an inclined feed pipe is installed near the high end of the rolling drum, the low end gap of the feed pipe is inserted into the wet material inlet, the high end surface of the feed pipe is closed, and the upper outer wall of the high end of the feed pipe is provided with a bell mouth, and the transmission tail end of the secondary belt conveyor mechanism is correspondingly located above the bell mouth.

[0013] Furthermore, the heating component is configured to correspond to a combustion chamber located below the rolling drum, and the top surface of the groove wall of the combustion chamber is in sealed friction contact with the outer wall surface of the rolling drum.

[0014] Due to the adoption of the above-mentioned technical solution, the present invention has the following beneficial effects: The molding sand renovation system disclosed in the present invention adopts the processes of crushing, cleaning, solid-liquid separation and sand drying to complete the renovation of old molding sand into new sand products. In particular, during cleaning, water washing, acid washing and neutralization and then water washing are adopted to ensure that the binder and auxiliary agent in the old molding sand can be cleaned safely. The alkaline solution and salt solution generated after cleaning can also be concentrated and dried for recycling and reuse. The entire renovation system can ensure the continuity and efficiency of cleaning and renovation, and can meet environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the implementation structure of the present invention; Figure 2 is a schematic diagram of the top view layout of the continuous cleaning equipment; Figure 3 is a schematic diagram of the layout of the continuous cleaning equipment from an end view; Figure 4 is a structural schematic diagram of the roller device; Figure 5 yes Figure 4 AA-direction cross-sectional structural diagram; Figure 6 It is a structural schematic diagram of the alkali solution drying equipment; Figure 7 is a structural schematic diagram of the drying device; Figure 8 Schematic diagram of the structure of the mixing device.

[0016] Figure: 1. Roller assembly; 101. Roller body; 102. Material and water inlet; 103. Material and water outlet; 104. Annular baffle; 105. Grinding body; 106. Material lifting plate; 107. Roller drive assembly; 108. Roller support assembly; 2. Material feed ramp; 3. Screw feeder; 4. Liquid collecting tank; 5. Drying device; 501. Roller; 502. Dry material outlet; 503. Wet material inlet; 504. Annular baffle; 505. Crushed material balls; 506. Heating assembly. 507. Power source component; 508. Support roller component; 5081. Positioning ring; 5082. Support roller; 5083. Support frame; 6. Mixing device; 601. Mixing tank; 602. Alkali solution inlet; 603. Alkali material inlet; 604. Mechanical stirring mechanism; 605. Screw conveying mechanism; 7. Primary belt conveyor mechanism; 8. Secondary belt conveyor mechanism; 9. Unloading station; 10. Feeding pipe; 1001. Bell mouth; 1002. Exhaust hole. DETAILED DESCRIPTION

[0017] The technical solutions of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" and the like indicating directions or positional relationships, these are merely for the purpose of corresponding to the drawings of the present invention and for the convenience of describing the present invention. They do not indicate or imply that the devices or components referred to must have a specific direction. Example 1:

[0018] Combined with attachment Figure 1The molding sand renovation system includes a crushing device, a continuous cleaning device, a solid-liquid separation device and a sand drying device. The old molding sand is first crushed into particles by the crushing device. According to the needs, the crushing device is set to a three-stage crushing, and the crushing specifications are 15 cm, 3 cm and less than 6 mm respectively, and generally can reach 6-30 mesh in the end; then it is sent to the continuous cleaning device for water washing, acid washing and neutralization and water washing again. The acid washing and neutralization generally use dilute sulfuric acid, and then it is sent to the solid-liquid separation device. The solid-liquid separation device can use conventional vibrating screens, cyclone separators or filter presses. The separated water is returned to the acid washing and neutralization water for reuse to save water resources. The separated molding sand particles are then dried by the sand drying equipment to become new sand products. The sand drying equipment generally adopts conventional equipment such as rotary dryer or belt dryer. The alkali liquid after washing the molding sand is usually mainly soda ash, and the salt liquid after acid washing and neutralization of the molding sand is usually mainly sodium sulfate. After concentration and drying, the solid particles are collected for reuse to prevent direct discharge and pollution of the environment. The concentration equipment adopts existing technical equipment to ensure that the water content is concentrated to about 70%. Example 2:

[0019] There are many types of existing drum cleaning mixers, but most of them are single-task mixing. However, the cleaning process of this application requires water washing, pickling and re-water washing of the molding sand, etc., with multiple different continuous task requirements. In order to ensure the continuity, convenience and automation of cleaning, it is necessary to develop and manufacture new continuous cleaning equipment based on drum mixing; Therefore, as attached Figure 2-5 As shown, based on the first embodiment, a continuous cleaning device is designed to include a plurality of roller devices 1 arranged side by side and used for stirring and cleaning sand mold fragments. The roller devices 1 can be provided with three, which are used for water washing, pickling and re-water washing in sequence. The number can also be adjusted according to actual cleaning needs. For example, five roller devices 1 are provided, two for water washing, two for pickling and one for re-water washing. The drum device 1 includes a drum body 101 with a material water inlet 102 and a material water outlet 103 at both ends respectively. The old molding sand and the cleaning liquid both enter from the material water inlet 102 of the drum body 101. All the drum bodies 101 are tilted so that the material water inlet 102 of each drum body 101 is higher than the material water outlet 103, ensuring that the old molding sand and the cleaning liquid can move continuously along the axial direction of the drum body 101 for cleaning operations; according to needs, a plurality of baffle groups are arranged at intervals along the axial direction in the drum body 101, each baffle group includes two annular baffles 104 spaced apart and arranged side by side, and a plurality of grinding bodies 105 are provided between the corresponding two annular baffles 104, the annular baffles 104 can block the grinding bodies 105, prevent the grinding bodies 105 from running to other grinding processes when the drum body 101 rotates, and prevent them from leaking from the material water outlet 103. The grinding bodies 105 are set as metal spheres, generally iron balls, which pass through the grinding bodies 10 5. The grinding of the molding sand can complete the more thorough and complete cleaning of the stubborn adhesive, greatly improving the cleaning efficiency; the outer edge of the annular baffle 104 is sealed and fixed to the inner wall of the drum body 101, and when the inclination angle of the drum body 101 is small, the plate surface of the annular baffle 104 can also be set as a mesh surface, which is convenient for running water and gravel to pass directly without large inclination accumulation and overflow; the inner wall of the drum body 101 between two adjacent baffle groups, and between the end face of the drum body 101 and the corresponding baffle group are provided with a plurality of lifting plates 106 evenly distributed along the circumference of the drum body 101, and the plate surface of the lifting plate 106 is vertically fixed to the inner wall of the drum body 101. When the lifting plate 106 rotates with the drum body 101, it can fully clean the molding sand by lifting it; in addition, the drum device 1 also includes a roller support assembly 108 for rolling support of the drum body 101, and a roller drive assembly 107 for driving the drum body 101 to roll; The two adjacent roller bodies 101 are staggered head to tail so that the material water inlet 102 of the rear roller body 101 is lower than the material water outlet 103 of the front roller body 101; a permeable feeding ramp 2 is mounted at the tail end of each roller body 101; as needed, the high-end edge and both side edges of the upper plate surface of the feeding ramp 2 are provided with baffles to prevent the leakage of molding sand, and the feeding ramp 2 is composed of an upper layer of permeable cloth and a lower layer of metal mesh, which facilitates the downward penetration and outflow of cleaning waste liquid in the process of carrying and conveying molding sand; in addition, a liquid collecting tank 4 is provided under the feeding ramp 2 for collecting the outflowing cleaning waste liquid for subsequent environmental protection treatment; in addition, a vibration motor is installed on the high-end lower plate surface of the feeding ramp 2, which vibrates through the vibration motor to ensure smooth feeding of the feeding ramp 2; the high-end plate surface of the feeding ramp 2 is correspondingly located below the material water outlet 103 of the corresponding roller body 101, and the low-end plate surface of the feeding ramp 2 is located below the material water outlet 103 of the corresponding roller body 101. The end plate surface extends to above the material and water inlet 102 of the adjacent drum body 101. The high and low inclination design of the drum body 101 and the feeding inclined plate 2 is used to realize the automatic continuity of the winding feeding of the molding sand; according to needs, a screw feeder 3 is set at the head end of the drum body 101, and the lower end plate surface of the corresponding feeding inclined plate 2 extends to the feeding port of the screw feeder 3, and the discharge end of the screw feeder 3 corresponds to the material and water inlet 102 of the drum body 101. The use of the screw feeder 3 for transition feeding can ensure complete feeding without material accumulation, and is convenient for controlling the feeding amount. The discharge end of the screw feeder 3 can be inserted into the material and water inlet of the drum body 101 without contact, mainly to ensure that the screw feeder 3 will not be affected by the movement when the drum body 101 rolls, or the discharge end of the screw feeder 3 is rotatably connected to the material and water inlet of the drum body 101 through a rotary bearing, which can also achieve a similar effect.

[0020] When the continuous cleaning equipment is working, it is only necessary to start the roller drive assembly 107 of each roller device 1 to drive the roller body 101 to rotate, and then add molding sand to the material water inlet 102 of the roller body 101 at the highest point. At the same time, corresponding water or acid liquid is continuously added to the material water inlet 102 of the roller body 101 that needs water washing or pickling. After the molding sand is cleaned by multiple grinding processes and material lifting processes of each roller device 1, it is discharged from the material water outlet 103 together with the waste liquid. When the waste liquid passes through the feed inclined plate 2, it seeps downward and flows out, and the molding sand is transferred to the next roller device 1 until it is discharged after cleaning is completed. Example 3:

[0021] Most existing concentrated alkali liquor drying equipment uses stirring drying, which involves placing concentrated, highly concentrated alkali liquor into a container and heating it while stirring to produce relatively dry sodium carbonate particles. It is well known that the viscosity of a solution is related to temperature and solute concentration. During the high-temperature drying process, as the temperature increases and the amount of water decreases, the sodium carbonate solution gradually becomes viscous and difficult to stir. This means that it has a viscosity limit (for soda ash, this is generally when the water content is close to 10% at high temperature). When the water content is almost gone with continued heating, the viscosity of the granular sodium carbonate decreases significantly. However, due to lack of continuous stirring, the granular sodium carbonate will also clump on the container wall, making it difficult to clean. This characteristic does not have a significant impact on laboratory or small-scale manual stirring industrial alkali drying. However, for large-scale industrial continuous alkali drying operations, the conflict between the viscosity limit and the difficulty of stirring is a technical problem that needs to be solved. Therefore, as attached Figure 6-8 As shown, based on the first embodiment, a drying device for concentrated alkali solution is designed, comprising a drying device 5, a mixing device 6, a primary belt conveyor mechanism 7, and a secondary belt conveyor mechanism 8. As needed, the primary belt conveyor mechanism 7 and the secondary belt conveyor mechanism 8 are both provided with control devices for controlling start and stop and conveying speed, so as to facilitate conveying control according to production needs. In order to prevent leakage of materials during the conveying process, baffles can also be provided on both sides of the conveying belts of the primary belt conveyor mechanism 7 and the secondary belt conveyor mechanism 8. The mixing device 6 includes a mixing tank body 601 and a screw conveying mechanism 605. The mixing tank body 601 is equipped with a mechanical stirring mechanism 604. The mechanical stirring mechanism 604 includes a stirring motor, a stirring shaft and a stirrer. An alkali solution inlet 602 and an alkali material inlet 603 are provided on the top of the mixing tank body 601. The concentrated alkali solution to be dried enters from the alkali solution inlet 602, and the dried alkali material enters from the alkali material inlet 603. A mixing outlet corresponding to the feeding port of the screw conveying mechanism 605 is provided at the bottom of the mixing tank body 601. The mixed wet material is sent out through the screw conveying mechanism 605. As needed, the water content of the wet alkali at the mixing outlet of the mixing tank body 601 is not higher than 10%, specifically generally 8%. When the wet alkali with this water content is dried at high temperature, the viscosity is relatively low; The drying device 5 includes a rolling drum 501 with a wet material inlet 503 and a dry material outlet 502 at both ends respectively. The rolling drum 501 is generally driven to rotate by a power source 507, and the existing one is generally controlled to rotate by a motor through a gear transmission; the rolling drum 501 is tilted so that the wet material inlet 503 is higher than the dry material outlet 502. The tilted rolling drum 501 can allow the material to continuously enter from the wet material inlet 503 and be discharged from the dry material outlet 502, thereby realizing industrial continuous and large-scale drying operations; as needed, support rollers 508 are provided at both ends of the rolling drum 501, and the support rollers 508 include a support frame and two support rollers rotatably mounted on the support frame and arranged side by side. The support rollers are coaxial with the rolling drum 501, and the outer drum wall of the rolling drum 501 corresponding to the support rollers 508 is fixed with The positioning ring and the supporting roller are provided with a groove which is adapted to fit the outer edge of the corresponding positioning ring. The supporting roller is used to support the rolling drum 501 in a rolling manner. At the same time, the supporting roller is always rolling and clamping the positioning ring, which can prevent the rolling drum 501 from being separated from the support. The rolling drum 501 is provided with an annular partition 504 which is fixed to the outer edge and the inner wall of the rolling drum 501. The inner cavity of the rolling drum 501 between the annular partition 504 and the dry material outlet 502 is provided with a plurality of crushing balls 505. The crushing balls 505 can further crush and granulate the material moved to the front of the dry material outlet 502. The outer wall of the rolling drum 501 between the annular partition 504 and the wet material inlet 503 is provided with a heating component 506. By heating the rolling drum 501, heat is transferred to the rolling drum 501 to dry the material. As needed, as attached Figure 7 As shown, the heating assembly 506 is configured to correspond to the combustion chamber located below the rolling drum 501. The top surface of the groove wall of the combustion chamber is in sealed friction contact with the outer wall of the rolling drum 501. The combustion chamber can be directly fed with hydrogen and oxygen through pipelines for combustion heating, or it can be circulated with high-temperature flue gas for heating. Of course, the top surface of the groove wall of the combustion chamber can be sealed or open, but the open surface has better heat transfer effect. The conveying head end of the primary belt conveyor mechanism 7 is located below the dry material outlet 502, and a discharge station 9 is provided on one side of the primary belt conveyor mechanism 7. The conveying tail end of the primary belt conveyor mechanism 7 is correspondingly located above the alkali material inlet 603. The dried material falls onto the primary belt conveyor mechanism 7 from the dry material outlet 502, a part of it is taken away from the discharge station 9, and the other part is conveyed to the mixing tank body 601 after cooling; the conveying head end of the secondary belt conveyor mechanism 8 is located below the discharge port of the spiral conveying mechanism 605, and the conveying tail end of the secondary belt conveyor mechanism 8 is correspondingly close to the top of the wet material inlet 503. The secondary belt conveyor mechanism 8 is used to convey the mixed wet material into the rolling drum 501 is subjected to final drying. According to the actual path requirements, the secondary belt conveyor mechanism 8 can be set as multiple serial conveyors; according to the needs, an inclined feed pipe 10 is set near the high end of the rolling drum 501, and the lower end gap of the feed pipe 10 is inserted into the wet material inlet 503 to ensure that the fixed feed pipe 10 does not affect the rolling of the rolling drum 501. The high end surface of the feed pipe 10 is closed, and the upper outer wall of the high end of the feed pipe 10 is provided with a bell mouth 1001. The transmission tail end of the secondary belt conveyor mechanism 8 is located above the bell mouth 1001, which is convenient for unloading and preventing leakage; in addition, an exhaust hole 1002 is provided on the top of the high end surface of the feed pipe 10 for exhausting drying gas.

[0022] When the concentrated alkali solution drying equipment is working, after the mechanical stirring mechanism of the mixing device is turned on, soda ash particles are first added to the mixing tank body 601, and then the concentrated sodium carbonate alkali solution with a water content of 72% is added to the mixing tank body 601 for stirring and mixing. The ratio of soda ash particles and sodium carbonate alkali solution must meet the requirement that the water content of the mixed wet alkali is about 8%. The mixed wet alkali is conveyed to the secondary belt conveyor mechanism 8 by the spiral conveying mechanism 605, and then conveyed into the rolling drum 501 by the secondary belt conveyor mechanism 8, and heated and dried by the heating component 506. That is, it can prevent the material from sticking by continuous rolling and stirring, and can also ensure uniform drying and improve drying efficiency. In addition, the inclined rolling drum 501 can make the material continuously enter from the wet material inlet 503 and be discharged from the dry material outlet 502. When the material moves to the dry material outlet 502, it can be further crushed and granulated by the crushing ball 505. The completely dried material is sent to the primary belt conveyor 7, a part of the finished material is taken away at the unloading station 9, and the other part of the soda ash particles are cooled to room temperature and then sent to the mixing device 6 for mixing; in view of the technical difficulty of continuous stirring due to the high temperature and high concentration viscosity limit during traditional alkali solution stirring and drying, the method of increasing the concentration at room temperature and finishing with high temperature is adopted to overcome it, that is, for the alkali solution to be dried, the soda ash particles are first mixed in to increase the concentration at room temperature to exceed the high temperature viscosity limit to become a wet material, and then the wet material is heated, stirred and dried.

[0023] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the above-mentioned embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure marks in the claims should not be regarded as limiting the content of the claims involved.

Claims

1. A molding sand renovation system, characterized by: It includes crushing equipment, continuous cleaning equipment, solid-liquid separation equipment and sand drying equipment. The old molding sand is crushed into particles by the crushing equipment, and then sent to the continuous cleaning equipment for water washing, pickling and neutralization, and water washing again. After that, it is sent to the solid-liquid separation equipment. The separated water is returned to the pickling and neutralization water. The separated molding sand particles are then dried in the sand drying equipment to become new sand products. The alkali solution after washing the molding sand and the salt solution after acid washing and neutralizing the molding sand are concentrated and dried to collect the solid particles.

2. The molding sand renovation system according to claim 1, characterized in that: The crushing equipment is set to three-stage crushing, with crushing specifications of 15 cm, 3 cm and below 6 mm respectively; the solid-liquid separation equipment adopts a vibrating screen, a cyclone separator or a filter press; the sand drying equipment adopts a rotary dryer or a belt dryer.

3. The molding sand renovation system according to claim 1, characterized in that: The continuous cleaning equipment comprises a plurality of roller devices (1) arranged side by side, wherein the roller device (1) comprises a roller body (101) provided with a material water inlet (102) and a material water outlet (103) at both ends, all the roller bodies (101) are arranged at an angle so that the material water inlet (102) of each roller body (101) is higher than the material water outlet (103), and two adjacent roller bodies (101) are arranged head to tail in a staggered manner so that the material water inlet (102) of the latter roller body (101) is lower than the material water outlet (103) of the former roller body (101); a water-permeable material conveying inclined plate (2) is mounted at the rear end of each roller body (101), the upper end plate surface of the material conveying inclined plate (2) is correspondingly located below the material water outlet (103) of the corresponding roller body (101), and the lower end plate surface of the material conveying inclined plate (2) extends to above the material water inlet (102) of the adjacent roller body (101).

4. The molding sand renovation system according to claim 3, characterized in that: A screw feeder (3) is mounted at the head end of the drum body (101), the lower end surface of the corresponding feed inclined plate (2) extends to the feed inlet of the screw feeder (3), and the discharge end of the screw feeder (3) corresponds to the material water inlet (102) of the drum body (101).

5. The molding sand renovation system according to claim 3, characterized in that: The upper edge and both side edges of the upper plate surface of the conveying inclined plate (2) are both provided with baffles, and the conveying inclined plate (2) is composed of an upper layer of water-permeable cloth and a lower layer of metal mesh.

6. The molding sand renovation system according to claim 3, characterized in that: A liquid collecting trough (4) is provided below the conveying inclined plate (2).

7. The molding sand renovation system according to claim 3, characterized in that: A plurality of baffle groups are arranged at intervals along the axial direction in the drum body (101), each baffle group comprises two annular baffles (104) spaced apart and arranged side by side, and a plurality of grinding bodies (105) are arranged between the two corresponding annular baffles (104), and the outer edges of the annular baffles (104) are correspondingly sealed and fixed to the inner wall of the drum body (101); a plurality of lifting plates (106) uniformly distributed along the circumference of the drum body (101) are provided between two adjacent baffle groups, and between the end face of the drum body (101) and the corresponding baffle group on the inner wall of the drum body (101), and the plate surface of the lifting plate (106) is fixed vertically to the inner wall of the drum body (101).

8. The molding sand renovation system according to claim 1, characterized in that: The alkali liquid drying equipment comprises a drying device (5), a mixing device (6), a primary belt conveyor mechanism (7) and a secondary belt conveyor mechanism (8); the mixing device (6) comprises a mixing tank body (601) and a screw conveying mechanism (605); the mixing tank body (601) is equipped with a mechanical stirring mechanism (604); the top of the mixing tank body (601) is provided with an alkali liquid inlet (602) and an alkali material inlet (603); the bottom of the mixing tank body (601) is provided with a mixing outlet corresponding to the feed inlet of the screw conveying mechanism (605); the water content of the wet alkali at the mixing outlet of the mixing tank body (601) is not higher than 10%; the drying device (5) comprises a rolling drum (501) with a wet material inlet (503) and a dry material outlet (502) respectively provided at two ends; the rolling drum (501) is tilted so that the wet material inlet (503) is higher than the dry material outlet (502); An annular partition (504) whose outer edge is fixed to the inner wall of the rolling drum (501) is provided in the rolling drum (501); a plurality of crushed material balls (505) are provided in the inner cavity of the rolling drum (501) between the annular partition (504) and the dry material outlet (502); a heating component (506) is provided on the outer wall of the rolling drum (501) between the annular partition (504) and the wet material inlet (503); the conveying head end of the primary belt conveyor mechanism (7) is located below the dry material outlet (502), and a material unloading station (9) is provided on one side of the primary belt conveyor mechanism (7); the conveying tail end of the primary belt conveyor mechanism (7) is correspondingly located above the alkali material inlet (603); the conveying head end of the secondary belt conveyor mechanism (8) is located below the discharge port of the spiral conveying mechanism (605), and the conveying tail end of the secondary belt conveyor mechanism (8) is correspondingly located close to above the wet material inlet (503).

9. The molding sand renovation system according to claim 8, characterized in that: An inclined feeding pipe (10) is mounted near the high end of the rolling drum (501), and the low end gap of the feeding pipe (10) is inserted into the wet material inlet (503). The high end surface of the feeding pipe (5) is closed, and the upper outer wall of the high end of the feeding pipe (10) is provided with a bell mouth (401), and the transmission tail end of the secondary belt transmission mechanism (8) is located correspondingly above the bell mouth (401).

10. The molding sand renovation system according to claim 8, characterized in that: The heating component (506) is configured to correspond to a combustion chamber located below the rolling cylinder (501), and the top surface of the combustion chamber wall is in sealed friction contact with the outer wall surface of the rolling cylinder (501).

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