Waste sand recovery device for casting processing

Abstract

The invention relates to a waste sand recovery device for casting processing, which is applied to the field of casting technology, and comprises a crushing cage, inner and outer filter cylinders, a confluence cylinder, a coil group, a dust removal discharge pipe, a liquid discharge pipe and a spray pipe and other components. The crushing cage is composed of a stainless steel cylinder and grinding balls, and the waste sand is fully crushed and ground. The inner and outer filter cylinders are made of non-magnetic materials, and filter holes evenly distributed are provided on the surface to achieve accurate screening. The coil group is surrounded by multiple sections, and the inner filter cylinder is subjected to zoned induction heating to achieve uniform thermal regeneration. Screws are provided in the dust removal discharge pipe and the liquid discharge pipe, and the dust and waste liquid are discharged in time in coordination with the pipeline opening design. The spray pipe adopts a bottom multi-hole design, and water or chemical reagents can be evenly sprayed into it to achieve wet regeneration. The invention integrates multiple functions such as crushing, dry regeneration, magnetic separation, thermal regeneration, dust removal, wet regeneration, centrifugal dehydration, drying and the like, and has good treatment effect and high quality of regenerated sand.

Description

Technical Field

[0001] The invention relates to a waste sand recovery device for casting processing, and in particular to a waste sand recovery device for casting processing applied in the field of casting technology. Background Art

[0002] The foundry industry produces a large amount of waste sand during the production process. If these waste sands are not effectively treated and recycled, it will not only cause a waste of resources, but also pollute the environment. Currently, waste sand recycling has become an important issue in the foundry industry.

[0003] Chinese invention patent CN112846070B discloses a process and equipment for recovering and regenerating coated sand. This process removes impurities on the surface of waste sand through crushing and screening, acidification and roasting, rubbing and air separation, etc., to form a new active surface, improve the morphology of silica sand particles, and improve its casting process performance. The patent also designs a matching circulating rubbing and air separation equipment with a simple structure and easy operation. However, this process requires multiple material transfers, a long processing flow, high energy consumption, and high costs. In addition, acidification and roasting can easily cause corrosion to the equipment, affecting its service life.

[0004] Chinese invention patent CN111001756B discloses an automatic separation, grinding and recovery device for foundry waste sand. The device uses an electromagnet to separate the magnetic metal in the waste sand, and uses a grinding wheel to separate the waste sand from the binder coating. After sufficient screening by a vibrating screen, the magnetic metal, recovered sand and coating are automatically classified and discharged from different ports, which is conducive to subsequent secondary utilization. However, the device is mainly for coated sand, and has limited effect on other types of foundry waste sand such as clay sand, water glass sand, etc. In addition, the screening process relies on mechanical vibration, the grading effect is not ideal, and fine powder is prone to cause dust.

[0005] The above patent processes waste sand through mechanical force and chemical methods, and realizes the recycling of waste sand to a certain extent, but there are still limitations such as long process flow, high energy consumption, high cost, and insufficient applicability. With the rapid development of the foundry industry, there is an urgent need for a new process and device for recycling waste sand with good treatment effect, high efficiency, low energy consumption, and strong applicability, so as to improve the comprehensive utilization level of waste sand, reduce production costs, and reduce environmental pollution. This is of great significance to promoting clean production and sustainable development of the foundry industry. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention provides a waste sand recovery device for casting processing and a working method thereof, so as to solve the problems existing in the waste sand recovery and reuse process, such as long process flow, high energy consumption, high cost, poor applicability, etc.

[0007] In order to solve the above problems, the present invention provides a waste sand recovery device for casting processing, including a crushing cage, the outer wall of the crushing cage is rotatably connected to an inner filter cartridge, the outer wall of the inner filter cartridge is rotatably connected to an outer filter cartridge, a collector cartridge is rotatably provided on the outer side of the outer filter cartridge, the outer wall of the collector cartridge is fixedly connected to a coil group, the coil group is electrically connected to a controller, both ends of the crushing cage are fixedly connected to end covers, the outer wall of the end cover is detachably connected to the inner wall of the inner filter cartridge, a processing chamber is formed between the inner wall of the inner filter cartridge and the two end covers, a collecting chamber is formed between the outer wall of the outer filter cartridge and the inner wall of the collector cartridge, a dust removal discharge pipe is rotatably connected between the two end covers, the bottom end of the outer wall of the collector cartridge is fixedly connected to a drain pipe, the bottom end of the outer wall of the dust removal discharge pipe is fixedly connected to a spray pipe, a plurality of grinding balls are filled in the processing chamber, the coil group is composed of multiple sections of coils, and each section of the coil is electrically connected to the controller.

[0008] In the above-mentioned waste sand recovery device for casting processing, multiple functions such as crushing, screening, dry regeneration, magnetic separation, thermal regeneration, dust removal, wet regeneration, dehydration and drying are integrated, and the waste sand is thoroughly purified and regenerated by various means such as mechanical force, magnetic force, thermal force, chemical reaction, etc., so that it can be directly reused in casting production. The invention has a short process flow, compact connection, high processing efficiency, low comprehensive energy consumption, stable quality of regenerated sand, wide application range, and good application prospects.

[0009] As a further improvement of the present application, a dust removal discharge pipe and a liquid discharge screw are coaxially rotatably connected in the dust removal discharge pipe and the liquid discharge pipe respectively, one end of the dust removal discharge screw and the liquid discharge screw respectively penetrate the dust removal discharge pipe and the liquid discharge pipe, and the penetrating parts are respectively fixedly connected with a driven gear and a driving gear.

[0010] As a further improvement of the present application, the driven gear and the driving gear are meshed and connected, the driven gear is fixedly connected to the inner filter cartridge at one end close to the dust removal and discharge screw, a motor is provided at the end of the driving gear away from the discharge screw, and the motor power shaft is fixedly connected to the driving gear through a coupling, and the motor is electrically connected to the controller.

[0011] As a further improvement of the present application, a feed port and a discharge port are provided on the end cover away from the driven gear, and baffles are clamped in the feed port and the discharge port, and an adjustment handle is fixedly connected to one end of the inner filter cartridge and the outer filter cartridge away from the driven gear.

[0012] As another improvement of the present application, the crushing cage is composed of multiple stainless steel cylinders, and the axial directions of the multiple stainless steel cylinders are parallel to the axial direction of the crushing cage. The multiple stainless steel cylinders are distributed in a circular array around the axis of the inner filter barrel, and the distance between the outer ends of two adjacent stainless steel cylinders is less than one-third of the diameter of the grinding balls. The diameters of the multiple stainless steel cylinders are equal to the diameter of the grinding balls, and the grinding balls are made of magnetic materials.

[0013] As another improvement supplement of the present application, feed grooves are provided at the top of the dust removal discharge pipe and the discharge pipe along their axial direction, a through groove is provided at the bottom of the manifold corresponding to the feed groove on the discharge pipe, and a plurality of spray holes are provided at the bottom of the spray pipe.

[0014] As another improvement supplement of the present application, multiple filter holes are provided on the inner filter cartridge and the outer filter cartridge along their radial direction, and the multiple filter holes are distributed in a circular array around the axis of the inner filter cartridge, and the filter holes on the inner filter cartridge correspond one to one with the filter holes on the outer filter cartridge.

[0015] As another improvement of the present application, a plurality of scrapers are fixedly connected to the outer end of the outer filter cylinder, and the plurality of scrapers are distributed in a circular array around the axis of the outer filter cylinder. The scrapers are made of flexible material, and the plurality of scrapers are arranged in contact with the inner wall of the collector cylinder away from one end of the outer filter cylinder. Both the outer filter cylinder and the collector cylinder are made of non-magnetic material, a cooling channel is provided in the coil group, the inner filter cylinder is made of non-magnetic conductive material, a bracket is fixedly connected to the outer end of the collector cylinder, and the bracket is fixedly connected to the motor.

[0016] A working method of a waste sand recovery device for casting processing comprises the following steps;

[0017] S1. Add the waste sand to be processed into the processing chamber through the feed port, load an appropriate amount of grinding balls, and close the baffles on the feed port and the discharge port;

[0018] S2. Start the motor and coil group through the controller. The motor drives the crushing cage, the inner filter cylinder and the outer filter cylinder to rotate through the driving gear and the driven gear. The impact and grinding of the crushing cage, the inner filter cylinder and the grinding balls are used to crush and dry-regenerate the waste sand, and the dust impurities are discharged through the dust removal discharge pipe.

[0019] S3, the coil group is energized to generate a magnetic field, which absorbs the magnetic impurities in the waste sand to the inner wall of the inner filter cylinder, and then the coil at the top of the inner filter cylinder is closed, so that the magnetic impurities are separated from the inner filter cylinder and discharged through the dust removal discharge pipe, thus realizing magnetic separation treatment;

[0020] S4, through the control coil group, the inner filter cartridge is subjected to high-frequency induction heating to the set temperature and maintained for a certain period of time, the heat is used to destroy the organic binder in the waste sand, and the thermal regeneration treatment is completed, and the generated gas and dust are continuously discharged through the dust removal discharge pipe;

[0021] S5. Add water or chemical reagents into the treatment chamber through the spray pipe, and stir and mix by rotating the crushing cage and the inner filter cylinder, remove pollutants on the surface of the waste sand by water washing and chemical reaction, and complete the wet regeneration treatment;

[0022] S6. Turn the adjustment handle to make the filter holes on the inner filter cylinder and the outer filter cylinder reach an appropriate opening, then rotate the crushing cage, the inner filter cylinder and the outer filter cylinder at high speed, use centrifugal force to dry the water and chemical reagents in the waste sand, and discharge the waste liquid through the drain pipe;

[0023] S7, start the coil group again to heat the inner filter cylinder to the set temperature and keep it for a period of time to dry the waste sand. At this point, the waste sand regeneration process is completed, open the discharge port to discharge the regenerated sand, and complete a cycle.

[0024] In summary, this application has the following beneficial effects:

[0025] 1. Good crushing effect, using stainless steel crushing cage and matching size grinding balls, can fully crush and grind the waste sand. The cylinder in the crushing cage matches the diameter of the grinding balls, and the spacing is reasonable, which can not only prevent the grinding balls from damaging the filter structure, but also play the best crushing role, crushing evenly and thoroughly, and the fineness is controllable.

[0026] 2. Dry regeneration is highly efficient, using the impact and grinding effect of the crushing cage, internal filter cartridge and grinding balls to remove residues on the surface of sand particles through mechanical force and air power, and then through double-stage screening of internal and external filter cartridges to effectively remove impurities and improve the quality of regenerated sand.

[0027] 3. Thorough magnetic separation. The coil group generates a magnetic field to absorb magnetic impurities such as iron filings in the waste sand. The impurities are collected centrally as the inner filter drum rotates. After the coil is closed, the impurities are discharged under the action of the dust removal device and the screw, and the removal effect is good.

[0028] 4. The thermal regeneration process is uniform in temperature. The coil group performs induction heating on the inner filter cartridge in different zones. The temperature can be precisely controlled and the thermal regeneration process is uniform and thorough. The high temperature can effectively decompose the organic binder such as phenolic resin in the waste sand, causing the carbonized residue to fall off and restore the sand to its original state.

[0029] 5. The dust removal is efficient and environmentally friendly. The dust and smoke generated during the crushing and thermal regeneration process are discharged in time through the dust removal discharge pipe. The pipeline is optimized and combined with the screw conveyor, the dust removal efficiency is high, the accumulation of pollutants is prevented, and the exhaust gas emissions meet environmental protection requirements.

[0030] 6. Wet regeneration chemical synergy, water or alkali solution is evenly sprayed through the spray pipe to fully mix with the waste sand. The water washes and dissolves the residual binder, and the alkali solution reacts with some binders to saponify, further removing the surface pollution of the sand particles, and the regeneration effect is good.

[0031] 7. Centrifugal dehydration is high-speed and efficient. By adjusting the filter hole opening of the inner and outer filter cylinders, the water and chemical reagents in the waste sand can be quickly and effectively dried under the strong centrifugal force generated by high-speed rotation. At the same time, the scraper is used to remove water stains on the inner wall of the confluence cylinder to prevent secondary pollution.

[0032] 8. Drying is energy-saving and thorough. The coil group moderately heats the inner filter again, and with centrifugal dehydration, the residual water in the waste sand can be evaporated at a lower temperature, saving energy. The cooling channel prevents the coil group from overheating, ensuring safe and efficient drying, and the quality of the regenerated sand after drying is guaranteed.

[0033] 9. Function integration: the present invention integrates various waste sand treatment processes such as crushing, dry regeneration, magnetic separation, thermal regeneration, dust removal, wet regeneration, centrifugal dehydration, and drying into one, with compact connection, linkage and coordination, high regeneration efficiency, and one machine with multiple functions, thus realizing all-round comprehensive recycling of waste sand.

[0034] 10. Intelligent automation, through the reasonable configuration of frequency conversion control motor, zone temperature control coil group, adjustment handle and other components, the intelligent and automatic operation of the equipment is realized. The process parameters can be flexibly adjusted to adapt to different waste sand properties and processing requirements to achieve optimized control.

[0035] 11. Economical and environmentally friendly, the equipment operates in a closed manner, the materials are completely separated, and the pollutant emissions are low. The comprehensive utilization rate of waste sand is high, saving resources. The equipment is highly versatile and can be used not only in the foundry industry, but also in other fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is the overall structure diagram of this application;

[0037] Figure 2 This is the front view of the application;

[0038] Figure 3 For this application Figure 2 Middle AA section view;

[0039] Figure 4 For this application Figure 3 Middle BB section view;

[0040] Figure 5 This is an overall exploded view of this application;

[0041] Figure 6 Partial explosion for this application Figure 1 ;

[0042] Figure 7 Partial explosion for this application Figure 2 ;

[0043] Figure 8 Partial explosion for this application Figure 3 ;

[0044] Fig. 9 Partial explosion for this application Figure 4 ;

[0045] Fig.10The appearance structure of this application Figure 1 ;

[0046] Fig.11 The appearance structure of this application Figure 2 .

[0047] Description of the numbers in the figure:

[0048] 1. Crushing cage; 2. Inner filter cartridge; 3. Outer filter cartridge; 4. Converging cartridge; 5. Coil assembly; 6. End cover; 7. Processing chamber; 8. Converging chamber; 9. Dust removal and discharge pipe; 10. Drain pipe; 11. Spray pipe; 12. Grinding balls; 13. Dust removal and discharge screw; 14. Drain screw; 15. Driven gear; 16. Driving gear; 17. Feed trough; 18. Scraper. DETAILED DESCRIPTION

[0049] Three implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0050] Example 1

[0051] This embodiment provides a waste sand recovery device for casting processing, such as Figure 1 As shown, it includes a crushing cage 1, the outer wall of the crushing cage 1 is rotatably connected to an inner filter cartridge 2, the outer wall of the inner filter cartridge 2 is rotatably connected to an outer filter cartridge 3, and a collector cartridge 4 is rotatably provided on the outer side of the outer filter cartridge 3. A coil group 5 is fixedly connected to the outer wall of the collector cartridge 4, and the coil group 5 is electrically connected to a controller. End caps 6 are fixedly connected to both ends of the crushing cage 1, and the outer wall of the end caps 6 is detachably connected to the inner wall of the inner filter cartridge 2. A processing chamber 7 is formed between the inner wall of the inner filter cartridge 2 and the two end caps 6, and a collector chamber 8 is formed between the outer wall of the outer filter cartridge 3 and the inner wall of the collector cartridge 4. A dust removal discharge pipe 9 is rotatably connected between the two end caps 6, a liquid discharge pipe 10 is fixedly connected to the bottom end of the outer wall of the collector cartridge 4, and a spray pipe 11 is fixedly connected to the bottom end of the outer wall of the dust removal discharge pipe 9. The processing chamber 7 is filled with a plurality of grinding balls 12, and the grinding balls 12 are made of magnetic material. The coil group 5 is composed of multiple coil segments, and each coil segment is electrically connected to the controller.

[0052] like Figure 4 and Figure 8 As shown, the crushing cage 1 is composed of multiple stainless steel cylinders, and the axis direction of the multiple stainless steel cylinders is parallel to the axis direction of the crushing cage 1. Multiple stainless steel cylinders are distributed in a circular array around the axis of the inner filter barrel 2, and the distance between the outer ends of two adjacent stainless steel cylinders is less than one-third of the diameter of the grinding ball 12, and the diameter of the multiple stainless steel cylinders is equal to the diameter of the grinding ball 12.

[0053] like Figure 1 , Figure 4 and Figure 7As shown, the inner filter cartridge 2 and the outer filter cartridge 3 are provided with a plurality of filter holes along their radial directions, the plurality of filter holes are distributed in a circular array around the axis of the inner filter cartridge 2, and the filter holes on the inner filter cartridge 2 correspond to the filter holes on the outer filter cartridge 3 one by one.

[0054] The outer filter cylinder 3 and the busbar cylinder 4 are both made of non-magnetic materials, and the inner filter cylinder 2 is made of non-magnetic conductive materials. A cooling channel is provided in the coil group 5, and a bracket is fixedly connected to the outer end of the busbar cylinder 4, and the motor is fixedly connected to the bracket.

[0055] During the rotation process, the crushing cage 1 and the inner filter cylinder 2 stir and grind the waste sand, so that the waste sand is fully broken and crushed, which is beneficial to the subsequent screening and regeneration.

[0056] The crushing cage 1 is composed of multiple stainless steel cylinders, which can evenly crush the waste sand. The stainless steel material is wear-resistant and corrosion-resistant, and has a long service life. The size of the stainless steel cylinder matches the grinding ball 12, which can prevent the grinding ball 12 from entering the inner filter cylinder 2 to damage the filter structure, and can also enable the grinding ball 12 to play the best crushing role.

[0057] Multiple filter holes are provided on the inner filter cartridge 2 and the outer filter cartridge 3 along their radial direction. The multiple filter holes are distributed in a circular array around the axis of the inner filter cartridge 2, and the filter holes on the inner filter cartridge 2 correspond to the filter holes on the outer filter cartridge 3 one by one. The filter holes on the inner and outer filter cartridges are arranged one by one, mainly to facilitate the adjustment of the opening of the filter holes, and then adjust the diameter of the smaller particles discharged. Specifically, by rotating the adjustment handles on the inner filter cartridge 2 and the outer filter cartridge 3, the filter holes on the two can be angularly displaced relative to each other, thereby changing the effective opening of the filter holes. The larger the opening, the larger the diameter of the particles allowed to pass; conversely, the smaller the opening, the smaller the diameter of the particles allowed to pass. By controlling the opening of the filter holes, the fineness of the regenerated sand can be adjusted in a targeted manner according to the waste sand particle size distribution and the recycling requirements, thereby improving the controllability of the quality of the regenerated sand. At the same time, the adjustability of the filter hole opening is also conducive to dealing with waste sand of different types and finenesses, and improving the applicability and versatility of the equipment.

[0058] The inner filter cartridge 2 is made of non-magnetic conductive material, which is conducive to induction heating by the coil group 5 and improves the thermal regeneration efficiency. The outer filter cartridge 3 and the confluence cartridge 4 are made of non-magnetic material to avoid interference with the magnetic separation process.

[0059] The coil group 5 is divided into multiple sections, which can heat different parts of the inner filter cartridge 2 in different sections, flexibly control and improve the uniformity of thermal regeneration. At the same time, a cooling channel is provided inside the coil group 5, which can effectively prevent the coil group 5 from overheating and ensure safe and stable operation.

[0060] When in use, the waste sand to be processed is added into the processing chamber 7 through the feed port on the end cover 6, and a proper amount of grinding balls 12 are loaded, and the feed port is closed. The motor is started by the controller to drive the crushing cage 1 and the inner filter cylinder 2 to rotate, and under the action of the crushing cage 1 and the grinding balls 12, the waste sand is fully crushed and ground.

[0061] The crushed sand and impurities enter between the inner and outer filter cylinders through the filter holes on the inner filter cylinder 2, achieving the first level of screening. The second level of screening is further achieved through the filter holes on the outer filter cylinder 3. The fine impurities enter the confluence chamber 8 through the outer filter cylinder 3 and are discharged through the drain pipe 10, while the preliminarily purified sand remains in the outer filter cylinder 3.

[0062] Next, the inner filter cartridge 2 is inductively heated by the coil group 5. The coil group 5 is powered in sections, and different parts of the inner filter cartridge 2 can be heated in sections, so that the waste sand is evenly thermally regenerated and organic impurities are removed. The dust and gas generated during the heating process are collected and discharged by the dust removal discharge pipe 9.

[0063] After the thermal regeneration, the sand is further purified by screening through the filter holes on the inner and outer filter cartridges. As needed, water or chemical reagents can be sprayed into the treatment chamber 7 through the spray pipe 11 to fully mix with the sand to achieve the effect of wet regeneration.

[0064] Finally, the discharge port is opened, and under the action of centrifugal force, the regenerated sand is discharged from the outer filter cylinder 3, completing the regeneration process of the waste sand.

[0065] The waste sand recovery device provided in this embodiment integrates multiple functions such as crushing, screening, thermal regeneration, wet regeneration, etc., has a complete processing process, good regeneration effect, and a wide range of applications.

[0066] The crushing cage 1 adopts a stainless steel cylindrical structure and is matched with grinding balls 12 of special size, so the crushing is uniform and thorough, and the equipment is durable and reliable with low maintenance cost.

[0067] The double-stage filtering structure of the inner filter cartridge 2 and the outer filter cartridge 3 can achieve fine classification of sand, effectively remove impurities, and improve the quality of regenerated sand.

[0068] The segmented heating method of the coil group 5 can achieve uniform thermal regeneration of the waste sand, with a high removal rate and guaranteed quality of the regenerated sand. At the same time, the cooling device can ensure the safe operation of the coil group 5.

[0069] The wet regeneration process can further remove the chemical impurities remaining on the sand surface, making the regenerated sand reach a higher degree of cleanliness and directly return it to foundry production.

[0070] The device has a compact structure, reasonable layout, closed treatment throughout the process, no pollution, low energy consumption, and meets environmental protection requirements. It has a high degree of automation, is easy to operate, and is economical and practical.

[0071] Example 2

[0072] On the basis of Example 1, this embodiment is further preferably, as Figure 1 , Figure 3 , Figure 4 , Figure 6 and Fig. 9 As shown, the dust removal discharge pipe 9 and the liquid discharge pipe 10 are coaxially connected with a dust removal discharge screw 13 and a liquid discharge screw 14. One end of the dust removal discharge screw 13 and the liquid discharge screw 14 penetrates the dust removal discharge pipe 9 and the liquid discharge pipe 10 respectively, and the penetration parts are fixedly connected with a driven gear 15 and a driving gear 16 respectively.

[0073] like Figure 1 , Figure 2 , Figure 3 , Figure 6 and Fig.10 As shown, the driven gear 15 and the driving gear 16 are meshed and connected, and the driven gear 15 is fixedly connected to the inner filter cartridge 2 at one end close to the dust removal and discharge screw 13. A motor is provided at the end of the driving gear 16 away from the discharge screw 14, and the motor power shaft is fixedly connected to the driving gear 16 through a coupling, and the motor is electrically connected to the controller.

[0074] Furthermore, a feed port and a discharge port are provided on the end cover 6 away from the driven gear 15, and baffles are clamped in the feed port and the discharge port. An adjustment handle is fixedly connected to one end of the inner filter cartridge 2 and the outer filter cartridge 3 away from the driven gear 15.

[0075] like Figure 1 and Figure 4 As shown, the top of the dust removal discharge pipe 9 and the discharge pipe 10 are provided with a feed slot 17 along the axial direction thereof, and the bottom of the manifold 4 is provided with a through slot corresponding to the feed slot 17 on the discharge pipe 10. The bottom of the spray pipe 11 is provided with a plurality of spray holes.

[0076] The dust removal and discharge screw 13 and the liquid discharge screw 14 are respectively arranged in the dust removal and discharge pipe 9 and the liquid discharge pipe 10, which can provide continuous conveying power during the dust removal and liquid discharge process, so that dust impurities and waste liquid can be discharged in time, the dust removal and liquid discharge efficiency can be improved, and the pipeline blockage can be prevented.

[0077] The driven gear 15 is meshed with the driving gear 16 to drive the dust removal and discharge screw 13 and the liquid discharge screw 14 to rotate, and can also synchronously drive the inner filter cylinder 2 to rotate, so that the waste sand regeneration process proceeds in a coordinated manner. The motor is connected to the driving gear 16 as a power source, and the speed is adjusted by the controller, which is convenient for flexible control according to working conditions.

[0078] The feed port and discharge port provided on the end cover 6 are convenient for loading waste sand and collecting regenerated sand, and the baffle can effectively seal to prevent waste sand from overflowing. The adjustment handles on the inner and outer filter cylinders 2 and 3 can conveniently adjust the opening and closing of the filter holes to control the filtering accuracy.

[0079] The feed slots 17 provided on the dust removal discharge pipe 9 and the liquid discharge pipe 10 cooperate with the through slots on the manifold 4, so that the dust and waste liquid collected in the manifold chamber 8 directly enter the dust removal discharge pipe 9 and the liquid discharge pipe 10, shortening the discharge path. The multiple spray holes at the bottom of the spray pipe 11 can evenly spray water or chemical reagents on the waste sand to increase the contact area.

[0080] On the basis of the working of Example 1, in this embodiment, when the waste sand begins to be processed, the motor is started. The motor drives the dust removal and discharge screw 13 and the liquid discharge screw 14 to rotate through the meshing transmission of the driving gear 16 and the driven gear 15. On the other hand, the motor drives the inner filter cylinder 2 to rotate through the driven gear 15, thereby driving the crushing cage 1 and the outer filter cylinder 3 to rotate synchronously.

[0081] After the waste sand is fully crushed and ground in the crushing cage 1, it is screened through the filter holes on the inner and outer filter cylinders 2 and 3. The dust impurities are collected in the confluence chamber 8, enter the drain pipe 10 through the through groove at the bottom of the confluence cylinder 4 that communicates with the drain pipe 10, and are discharged through the drain pipe 10 under the push of the drain screw 14.

[0082] At the same time, the dust and smoke generated during the thermal regeneration process enter the dust removal and discharge pipe 9 from the upper part of the confluence chamber 8 through the feed trough 17 and are discharged under the transportation of the dust removal and discharge screw 13.

[0083] When the waste sand needs to be wet-regenerated, the spray pipe 11 is started, and water or chemical reagents are sprayed into the treatment chamber 7 through the spray holes at the bottom of the spray pipe 11 to mix with the waste sand. After wet regeneration, the adjustment handles on the inner and outer filter cartridges 2 and 3 are opened to dry the water in the waste sand under the action of high-speed centrifugation, and the regenerated sand is discharged from the discharge port, and the waste liquid is discharged through the discharge pipe 10.

[0084] The arrangement of the dust removal and discharge screw 13 and the liquid discharge screw 14 greatly improves the dust and waste liquid discharge efficiency, enables the dust removal and liquid discharge process to proceed continuously, does not affect the waste sand processing capacity due to pipeline blockage, and ensures the normal operation of the equipment.

[0085] The meshing transmission mode of the driving gear 16 and the driven gear 15 can realize multiple processes such as dust removal, material discharge, liquid discharge and screening synchronously, making the equipment run in a coordinated and efficient manner and saving energy. The motor speed regulation is flexible and the operating parameters can be optimized according to the processing requirements.

[0086] The end cover 6 is provided with an inlet and outlet port and a baffle, which makes it easy to load and unload the waste sand and has good sealing performance, which can not only feed quantitatively but also prevent the waste sand from leaking out. The inner and outer filter cartridges 2 and 3 use adjustment handles to control the filtration accuracy, and the filtration scheme can be optimized according to the characteristics of the waste sand to ensure the quality of the regenerated sand.

[0087] The connection design between the manifold 4, the drain pipe 10 and the dust removal discharge pipe 9 shortens the discharge path of dust and waste liquid, making the dust removal and liquid discharge more direct and efficient. The spray pipe 11 adopts a multi-hole design, which makes the spraying more uniform and the wet regeneration effect better.

[0088] This embodiment optimizes the design of dust removal, material discharge and liquid discharge components to make the various processes of waste sand regeneration treatment more compact and smoother. While improving the treatment efficiency, it also improves the environmental performance of the equipment and achieves high-value utilization of waste sand resources.

[0089] Example 3

[0090] like Figures 1 to 11 As shown, based on Example 1 and Example 2, this embodiment provides a working method of a waste sand recovery device for casting processing, comprising the following steps:

[0091] S1. Add the waste sand to be processed into the processing chamber 7 through the feed port on the end cover 6, load an appropriate amount of grinding balls 12, and close the baffles on the feed port and the discharge port.

[0092] S2. Start the motor and coil group 5 through the controller. The motor drives the crushing cage 1, the inner filter cylinder 2 and the outer filter cylinder 3 to rotate through the driving gear 16 and the driven gear 15. The waste sand is crushed and dry-regenerated by the impact and grinding effect of the crushing cage 1, the inner filter cylinder 2 and the grinding balls 12, and the dust impurities are discharged through the dust removal discharge pipe 9.

[0093] S3, the coil group 5 is energized to generate a magnetic field, which absorbs the magnetic impurities in the waste sand to the inner wall of the inner filter cylinder 2, and then the coil at the top of the inner filter cylinder 2 is closed, so that the magnetic impurities are separated from the inner filter cylinder 2 and discharged through the feed slot 17 on the dust removal discharge pipe 9 under the action of the dust removal discharge screw 13, thereby realizing magnetic separation treatment.

[0094] S4, by controlling the coil group 5, the inner filter cartridge 2 is subjected to high-frequency induction heating to 300-500°C and maintained for 10-30 minutes, and the heat is used to destroy the organic binders such as phenolic resin and furan resin in the waste sand, decompose or burn them, and complete the thermal regeneration treatment, while continuously discharging the generated gas and dust through the dust removal discharge pipe 9.

[0095] S5. Water or alkaline reagents such as NaOH, KOH, etc. are added into the treatment chamber 7 through the spray pipe 11 to form a slurry with the waste sand, and stirring and mixing are achieved through the rotation of the crushing cage 1 and the inner filter cartridge 2. The binder and other pollutants remaining on the surface of the sand particles are dissolved by water washing and chemical reaction to complete the wet regeneration treatment.

[0096] S6. Turn the adjustment handle to stagger the filter holes on the inner filter cartridge 2 and the outer filter cartridge 3 to an appropriate opening, then rotate the crushing cage 1, the inner filter cartridge 2 and the outer filter cartridge 3 at high speed, use centrifugal force to dry the water and chemical reagents in the waste sand, and discharge the waste liquid through the drain pipe 10.

[0097] S7, start the coil group 5 again to heat the inner filter cartridge 2 to 100-200°C and keep it for 5-10 minutes to dry the waste sand. At this point, the waste sand regeneration process is completed, and the discharge port is opened to discharge the regenerated sand, completing a cycle.

[0098] In the dry regeneration stage, the crushing cage 1 and the inner filter cartridge 2 drive the grinding balls 12 to impact and crush the waste sand, breaking up the waste sand agglomerates. At the same time, the residues on the surface of the sand particles are removed under the action of mechanical force and aerodynamic force, and then the dust and other light impurities are screened through the inner and outer filter cartridges 2, 3 and discharged through the dust removal discharge pipe 9.

[0099] During the magnetic separation stage, the coil group 5 generates a magnetic field, which absorbs magnetic impurities such as iron filings in the waste sand to the inner wall of the inner filter cylinder 2 and rotates with it. After the top coil is closed, the impurities fall into the dust removal discharge pipe 9 under the action of gravity and are transported and discharged by the dust removal discharge screw 13.

[0100] In the thermal regeneration stage, the coil group 5 performs high-frequency induction heating on the inner filter cartridge 2, and the waste sand temperature is raised to 300-500°C through heat conduction, so that the organic matter such as phenolic resin in the waste sand is decomposed or burned. The high-temperature flue gas is discharged from the dust removal discharge pipe 9, and the carbonized residue of the thermally decomposed binder falls off with the surface of the sand particles.

[0101] In the wet regeneration stage, the spray pipe 11 sprays water or alkali solution into the treatment chamber 7, and utilizes the stirring effect of the crushing cage 1 and the inner filter cartridge 2 to fully mix it with the waste sand, and the residual binder is dissolved by water washing. The alkali solution reacts with certain binders such as furan resin to undergo saponification reaction, further decomposing and removing pollutants on the surface of the sand particles.

[0102] During the centrifugal dehydration stage, the handle is adjusted to control the opening of the filter holes of the inner filter cylinder 2 and the outer filter cylinder 3. The high-speed rotation generates a strong centrifugal force to dry the water and reagents in the waste sand and discharge them through the drain pipe 10. The scraper 18 removes water stains on the inner wall of the confluence cylinder 4 to prevent secondary pollution.

[0103] In the drying stage, the coil group 5 heats the inner filter cartridge 2 again to 100-200°C to evaporate the residual moisture in the waste sand and complete the regeneration process. The cooling channel prevents the coil group 5 from overheating. Finally, the discharge port is opened to discharge the dry regenerated sand under the action of centrifugal force.

[0104] The working method of the waste sand recovery device provided in this embodiment integrates multiple regeneration treatments such as dry method, magnetic separation, thermal method, wet method and drying method, and can perform combined cleaning according to the properties of the waste sand, with good removal effect and high quality of regenerated sand, which can be directly reused in casting production.

[0105] Dry regeneration uses mechanical force and air power to remove impurities on the surface of sand particles, magnetic separation removes magnetic foreign matter, thermal regeneration decomposes organic binders, and wet regeneration dissolves residual pollution. Multiple methods are combined to ensure thorough treatment and restore the sand particles to their original state.

[0106] The thermal regeneration temperature is 300-500℃, and the wet regeneration uses alkali solution, which are the most suitable treatment process conditions, energy saving and efficiency improvement. The coil group is heated in 5 sections, the temperature is controllable, and the drying temperature is reduced to 100-200℃, which saves energy and dries the sand evenly.

[0107] Waste sand, dust and waste liquid are collected and discharged through special devices, and the materials are separated thoroughly, with good dust and slag removal effects. The discharge path is short and the discharge is timely, which will not cause equipment blockage and secondary pollution.

[0108] It has high automation, compact process connection, high processing efficiency, and can process 1-10 tons of waste sand per hour. With modular design, the processing capacity can be flexibly set according to needs. The equipment runs stably and reliably, is easy to maintain, and has low use cost.

[0109] The whole process is closed, which reduces the escape of dust, collects waste liquid in a centralized manner, has low noise and meets environmental protection requirements. The quality of regenerated sand is stable and the comprehensive utilization rate is high.

[0110] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A waste sand recovery device for casting processing, characterized in that: The invention comprises a pulverizing cage (1), wherein the outer wall of the pulverizing cage (1) is rotatably connected to an inner filter cartridge (2), the outer wall of the inner filter cartridge (2) is rotatably connected to an outer filter cartridge (3), a collector cartridge (4) is rotatably provided on the outer side of the outer filter cartridge (3), the outer wall of the collector cartridge (4) is fixedly connected to a coil group (5), the coil group (5) is electrically connected to a controller, and both ends of the pulverizing cage (1) are fixedly connected to end covers (6), the outer wall of the end covers (6) is detachably connected to the inner wall of the inner filter cartridge (2), and the inner wall of the inner filter cartridge (2) is connected to the inner wall of the inner filter cartridge (2). A processing chamber (7) is formed between the two end covers (6), a confluence chamber (8) is formed between the outer wall of the outer filter cylinder (3) and the inner wall of the confluence cylinder (4), a dust removal discharge pipe (9) is rotatably connected between the two end covers (6), a liquid discharge pipe (10) is fixedly connected to the bottom end of the outer wall of the confluence cylinder (4), and a spray pipe (11) is fixedly connected to the bottom end of the outer wall of the dust removal discharge pipe (9), a plurality of grinding balls (12) are filled in the processing chamber (7), and the coil group (5) is composed of a plurality of coil sections, each of which is electrically connected to a controller.

2. The waste sand recovery device for casting processing according to claim 1 is characterized in that: The dust removal discharge pipe (9) and the liquid discharge pipe (10) are respectively coaxially rotatably connected with a dust removal discharge screw (13) and a liquid discharge screw (14); one end of the dust removal discharge screw (13) and the liquid discharge screw (14) respectively penetrates the dust removal discharge pipe (9) and the liquid discharge pipe (10), and the penetrated portions are respectively fixedly connected with a driven gear (15) and a driving gear (16).

3. The waste sand recovery device for casting processing according to claim 2 is characterized in that: The driven gear (15) and the driving gear (16) are meshingly connected; the driven gear (15) is fixedly connected to the inner filter cartridge (2) at one end close to the dust removal and discharge screw (13); a motor is provided at one end of the driving gear (16) away from the liquid discharge screw (14); and a power shaft of the motor is fixedly connected to the driving gear (16) via a coupling; the motor is electrically connected to the controller.

4. The waste sand recovery device for casting processing according to claim 2 is characterized in that: A feed port and a discharge port are provided on the end cover (6) away from the driven gear (15), and baffles are clamped in the feed port and the discharge port. An adjustment handle is fixedly connected to one end of the inner filter cartridge (2) and the outer filter cartridge (3) away from the driven gear (15).

5. The waste sand recovery device for casting processing according to claim 1 is characterized in that: The pulverizing cage (1) is composed of a plurality of stainless steel cylinders, and the axis directions of the plurality of stainless steel cylinders are parallel to the axis direction of the pulverizing cage (1). The plurality of stainless steel cylinders are distributed in a circular array around the axis of the inner filter cartridge (2), and the distance between the outer ends of two adjacent stainless steel cylinders is less than one third of the diameter of the grinding balls (12). The diameters of the plurality of stainless steel cylinders are equal to the diameter of the grinding balls (12), and the grinding balls (12) are made of magnetic material.

6. The waste sand recovery device for casting processing according to claim 1 is characterized in that: The top ends of the dust removal discharge pipe (9) and the liquid discharge pipe (10) are provided with feed grooves (17) along their axial directions, the bottom end of the manifold (4) is provided with a through groove at a position corresponding to the feed groove (17) on the liquid discharge pipe (10), and the bottom end of the spray pipe (11) is provided with a plurality of spray holes.

7. The waste sand recovery device for casting processing according to claim 1 is characterized in that: The inner filter cartridge (2) and the outer filter cartridge (3) are both provided with a plurality of filter holes along their radial directions, and the plurality of filter holes are distributed in a circular array around the axis of the inner filter cartridge (2), and the filter holes on the inner filter cartridge (2) correspond to the filter holes on the outer filter cartridge (3) one by one.

8. The waste sand recovery device for casting processing according to claim 4 is characterized in that: A plurality of scrapers (18) are fixedly connected to the outer end of the outer filter cylinder (3), and the plurality of scrapers (18) are distributed in a circular array around the axis of the outer filter cylinder (3). The scrapers (18) are made of a flexible material, and the plurality of scrapers (18) are arranged to contact the inner wall of the confluence cylinder (4) at one end away from the outer filter cylinder (3).

9. The waste sand recovery device for casting processing according to claim 3 is characterized in that: The outer filter cylinder (3) and the collector cylinder (4) are both made of non-magnetic materials, a cooling channel is provided in the coil group (5), the inner filter cylinder (2) is made of non-magnetic conductive material, the outer end of the collector cylinder (4) is fixedly connected to a bracket, and the bracket is fixedly connected to the motor.

10. A working method of a waste sand recovery device for casting processing according to any one of claims 1 to 9, characterized in that: The steps include: S1, adding the waste sand to be processed into the processing chamber (7) through the feed port, loading an appropriate amount of grinding balls (12), and closing the baffles on the feed port and the discharge port; S2, starting the motor and the coil group (5) through the controller, the motor drives the crushing cage (1), the inner filter cylinder (2) and the outer filter cylinder (3) to rotate through the driving gear (16) and the driven gear (15), and the waste sand is crushed and dry-regenerated by the impact and grinding action of the crushing cage (1), the inner filter cylinder (2) and the grinding balls (12), and the dust impurities are discharged through the dust removal discharge pipe (9); S3, the coil group (5) is energized to generate a magnetic field, which attracts magnetic impurities in the waste sand to the inner wall of the inner filter cylinder (2), and then the coil at the top of the inner filter cylinder (2) is closed, so that the magnetic impurities are separated from the inner filter cylinder (2) and discharged through the dust removal discharge pipe (9), thereby achieving magnetic separation treatment; S4, high-frequency induction heating is performed on the inner filter cartridge (2) to a set temperature through the control coil group (5), and the temperature is maintained for a certain period of time, so that the heat is used to destroy the organic binder in the waste sand, thereby completing the thermal regeneration treatment, and at the same time, the generated gas and dust are continuously discharged through the dust removal discharge pipe (9); S5, adding water or chemical reagents into the treatment chamber (7) through the spray pipe (11), and stirring and mixing by rotating the crushing cage (1) and the inner filter cartridge (2), removing pollutants on the surface of the waste sand by water washing and chemical reaction, and completing the wet regeneration treatment; S6, turning the adjustment handle to make the filter holes on the inner filter cartridge (2) and the outer filter cartridge (3) reach an appropriate opening, then rotating the crushing cage (1), the inner filter cartridge (2) and the outer filter cartridge (3) at a high speed, using centrifugal force to remove moisture and chemical reagents in the waste sand, and at the same time discharging the waste liquid through the drain pipe (10); S7, the coil group (5) is started again to heat the inner filter cartridge (2) to a set temperature and maintain the temperature for a period of time to dry the waste sand. At this point, the waste sand regeneration process is completed, and the discharge port is opened to discharge the regenerated sand, completing a cycle.

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