CN216912007U

CN216912007U - Multistage regeneration processing device of molding sand is retrieved to combined type

Info

Publication number: CN216912007U
Application number: CN202123028549.6U
Authority: CN
Inventors: 马兴荣
Original assignee: Yunnan Yuantai Precision Machinery Co ltd
Current assignee: Yunnan Yuantai Precision Machinery Co ltd
Priority date: 2021-12-06
Filing date: 2021-12-06
Publication date: 2022-07-08
Anticipated expiration: 2031-12-06

Abstract

The utility model discloses a combined type multistage regeneration treatment device for recycled molding sand, and relates to the technical field of casting molding. Mainly solves the defects of the pure mechanical method and the pure roasting method for sand recovery, provides a composite regeneration mode, and has better cost and efficiency than the regeneration device in the prior art. The device mainly comprises three mechanisms, namely a waste sand pretreatment mechanism, a waste sand mechanical treatment mechanism and a waste sand thermal treatment mechanism, wherein the three mechanisms can operate independently or in series; through a proper multistage waste sand treatment device, the regenerated molding sand with lower production cost is prepared, the problem of environmental pollution is fundamentally solved, the consumption of natural sand is reduced, and the healthy development of the casting molding material industry is promoted.

Description

Multistage regeneration processing device of molding sand is retrieved to combined type

Technical Field

The utility model relates to the technical field of casting and modeling, in particular to a combined type multistage regeneration treatment device for recycled molding sand.

Background

The casting industry is a basic industry in the manufacturing industry, and the development of all industries can not leave castings. As a large casting country in China for a long time, the consumption of the sand for casting is huge. According to statistics, the waste sand is discharged by about 1 ton per ton of casting production in China, thousands of tons of the waste sand are discharged every year, and the resource consumption and the environmental pollution are very remarkable. While a large amount of waste foundry sand is discharged, enterprises need to supplement an equal amount of new sand to the production line to maintain the operation of the production line, and the purchase cost and the transportation cost of the new sand caused by the waste foundry sand are huge every year nationwide, so that huge economic burden is brought to the enterprises, and huge pressure is brought to resources and environments in China. Therefore, the treatment and recycling of the waste foundry sand become problems which need to be solved urgently at present, and the method has great practical significance for the green sustainable development of the foundry industry in China.

The used sand produced by casting can be divided into three parts: the resin sand comprises resin sand for core making, wet clay sand and used sand after molding, and the used sand comprises the resin sand and the clay sand. For single resin sand, directly adopting 'thermal roasting + screening', but the used sand with the largest dosage is mixed sand, namely clay sand and resin sand, while the simple mechanical method regeneration has the defects of low efficiency, large abrasion to sand grains, more dust in the regenerated sand and the like, and is not completely used, while the simple roasting method has no obvious effect on clay sand regeneration; therefore, the regeneration mode, cost and efficiency of the mixed sand are the key points of the current research.

Disclosure of Invention

In order to solve the above problems, the present invention provides a multi-stage reclamation apparatus for reclaiming molding sand.

The utility model adopts the following technical scheme: the utility model provides a multistage regeneration processing apparatus of molding sand is retrieved to combined type, mainly includes triplex mechanism, and one is the pretreatment mechanism of useless sand, and two is the mechanical processing mechanism of useless sand, and three are useless sand thermal method processing mechanism, its characterized in that: the three mechanisms can operate independently or in series;

the pretreatment mechanism comprises a clay waste sand collecting tank 1 and a resin waste sand collecting tank 2, the two are connected with a conveyor and connected to a waste sand mixing bin 3 through a pipeline, wherein a one-level crushing mechanism 4 is arranged between the resin waste sand collecting tank 2 and the waste sand mixing bin 3, and massive resin waste sand is subjected to primary crushing.

The mechanical treatment mechanism for the waste sand is arranged behind the pretreatment mechanism and comprises a magnetic separation mechanism and a grinding mechanism;

the bottom of the waste sand mixing bin 3 is provided with a vibrating motor 5, a spiral feeder 6 is arranged below an outlet, the spiral feeder is connected with a magnetic separator which is used for lifting the mixed waste sand to a high position through a lifting pipeline 7, the outlet of the lifting pipeline 7 is opposite to a first-stage conveying belt 8, a first-stage magnetic separator is arranged on the first-stage conveying belt 8 and comprises a first-stage magnetic roller 9, a scraping plate 10 arranged below the first-stage magnetic roller and a selection slag hopper 11, and the selection slag hopper 11 is externally connected with a slag discharging pipeline 12; a semi-sealed conveying groove 13 is arranged at the blanking end of the first-level magnetic roller 9, the outlet of the conveying groove 13 is over against a second-level conveying belt 14, the second-level conveying belt 14 is provided with a second-level magnetic separator, and the structure of the second-level conveying belt is consistent with that of the first-level magnetic separator.

A spiral feeder 6 is arranged at an outlet of the magnetic separator and is connected with a used sand roasting mechanism, and the used sand roasting mechanism comprises a conveying pipe 15, a gas pipeline 16, a hot blast stove 17, a drum-type roasting furnace 18, a discharge port 19 and a dust removal mechanism 20;

the conveying groove 13 of the secondary magnetic separator is connected with the temporary storage bin 21 and then enters the drum-type roasting furnace 18 through the conveying pipe 15; meanwhile, a hot air pipe of a hot air furnace 17 is also connected to the drum-type roasting furnace 18 and is positioned below the conveying pipe 15, the recovered sand is added from a high position, and hot air enters from a low position and is in countercurrent contact with the recovered sand; the gas pipeline 16 extends into the roller roasting furnace 18 from the discharge port 19 and is connected with combustion nozzles 161 which are uniformly distributed in the furnace body; the recovered sand moves towards the discharge port 19 under the action of gravity along with the rotation of the roller type roasting furnace 18, and is directly heated by high-temperature combustion gas sprayed by the combustion nozzle 161 in the process of moving forwards in the cylinder, so that organic matters contained in the recovered sand and adhered substances on the surface of sand grains are burned, and a mechanical treatment mechanism can conveniently remove the recovered sand; the burned recovered sand moves to a discharge port 19, is discharged at regular time and is sent out by a belt conveyor or a spiral conveyor; the hot air and the waste gas generated by combustion fed into the furnace are treated by a dust removing mechanism 20 arranged at the tail end of the roller type roasting furnace 18 and then discharged.

A discharge port 19 of the roller type roasting furnace 18 is connected to a cooling tower 22, and the recovered sand is cooled to a proper temperature and then enters a mechanical treatment mechanism, namely a used sand grinding machine, through a pipeline;

the used sand grinder includes a grinding box 23 and a grinding shaft 24 which are installed together but independently rotate in opposite directions, and other auxiliary members including a bracket 25, a supporting shaft 26, and a driving motor 27; the two ends of the bracket 25 are respectively fixed with the grinding box 23 and a driving motor 27 and a protective cover 28 of the grinding shaft 24; the grinding box 23 and the grinding shaft 24 are both installed in a protective cover 28, wherein the grinding box 23 is supported by a left supporting shaft 26 and connected to a left driving motor 27, while the grinding shaft 24 is installed integrally inside the grinding box 23, but the front end thereof is not in contact with the left end portion of the grinding box 23, and the rear end of the grinding shaft 24 passes through the right end plate of the grinding box 23 and then is connected to a right supporting shaft 26 and then is connected to the right driving motor 27; a sand inlet 281 is formed in the top of the protective cover 28, the upper end of the protective cover is connected with an outlet of the cooling tower 22, the lower end of the protective cover is opposite to a lower sand port 231 arranged on the grinding box 23, a valve capable of being opened and closed is arranged on the lower sand port 231, and the valve is opened during blanking or discharging and closed during grinding; a sand collecting hopper 282 is provided below the grinding box 23, a screw feeder is provided below an opening of the sand collecting hopper 282, and the screw feeder feeds the processed recovered sand into the reclaimed sand silo 29 for storage.

Preferably, a spiral sand-making plate is mounted on the inner wall of the drum roasting furnace 18, and the recovered sand is continuously lifted and turned over along with the rotation of the drum roasting furnace 18 to increase the contact surface, so as to improve the burning effect.

Preferably, stirring shafts 241 are uniformly distributed on the grinding shaft 24 in a staggered manner, and the length of each stirring shaft 241 does not exceed the distance from the grinding shaft 24 to the inner wall of the grinding box 23.

Preferably, a polishing layer formed by bonding diamond grains is arranged on the inner wall of the polishing box 23, and the surface of used sand entering the polishing layer is polished.

Preferably, an emptying pipeline 30 is arranged on the side of the magnetic separator, the emptying pipeline 30 is connected with a trumpet-shaped space below the magnetic separator, a plurality of layers of dust removing nets 31 are arranged in the space, an ash depositing bucket is arranged below the dust removing nets, an air inlet 32 is arranged at the other end of the trumpet-shaped space, air is filled into the trumpet-shaped space, an easily-raised ash layer in the cleaned waste residues is blown, isolated by the dust removing nets 31 and then separated out for collection.

The utility model follows the following steps in operation:

firstly, respectively putting the clay waste sand and the resin waste sand into corresponding collecting tanks, and conveying the clay waste sand and the resin waste sand to a waste sand mixing bin 3 through pipelines, wherein the resin waste sand needs to pass through a primary crushing mechanism 4 before entering the waste sand mixing bin 3, and the blocky resin waste sand is conveyed continuously after being primarily crushed; after being uniformly mixed in the mixing bin, the waste sand enters two-stage magnetic rollers of a magnetic separation separator through a screw feeder 6 and a conveying belt for magnetic separation, and iron impurities mixed in the waste sand and left by pouring are removed; then the waste sand enters a used sand roasting mechanism, wherein the waste sand directly enters the higher end of the drum-type roasting furnace 18 through a material conveying pipe 15, meanwhile, a hot air pipe of a hot air furnace 17 is also connected to the drum-type roasting furnace 18, the recovered sand is added from the high position, and hot air enters from the low position and is in countercurrent contact with the recovered sand; burning through the combustion nozzles 161 which are uniformly distributed in the furnace body, burning organic matters contained in the furnace body and adhered matters on the surface of sand grains, and facilitating the removal of a mechanical treatment mechanism; the burned recovered sand moves to a discharge port 19 and enters a used sand grinder, under the driving of the reverse motion of a grinding box 23 and a grinding shaft 24, the waste sand continuously rubs and collides on a grinding layer formed by bonding carborundum on the inner surface of the grinding box 23 to complete the removal of surface impurities, and finally enters a regenerated sand bin 29 for storage.

Has the advantages that:

the utility model uses the appropriate multistage waste sand treatment device to recycle the casting waste sand, changes waste into valuable, prepares the regenerated molding sand with lower production cost, fundamentally solves the problem of environmental pollution caused by stacking and burying the casting waste sand, reduces the consumption of the regenerated molding sand on natural sand by adopting solid waste as the main raw material, saves natural resources, makes the waste become the profit point of green manufacturing of enterprises from the economic and environment-friendly burden of the original casting industry, and promotes the healthy development of the casting molding material industry.

Drawings

Fig. 1 is a schematic structural view of the present invention.

FIG. 2 is a schematic structural view of example 2.

In the figure: the device comprises a clay waste sand collecting tank 1, a resin waste sand collecting tank 2, a waste sand mixing bin 3, a primary crushing mechanism 4, a vibration motor 5, a screw feeder 6, a lifting pipeline 7, a primary conveying belt 8, a primary magnetic roller 9, a scraper 10, a primary slag collecting hopper 11, a slag discharge pipeline 12, a conveying tank 13, a secondary conveying belt 14, a conveying pipe 15, a gas pipeline 16, a burner nozzle 161, a hot blast stove 17, a roller type roasting furnace 18, a discharge port 19, a dust removing mechanism 20, a temporary storage bin 21, a cooling tower 22, a grinding box 23, a lower sand port 231, a grinding shaft 24, a stirring shaft 241, a support 25, a support shaft 26, a driving motor 27, a protective cover 28, a sand inlet 281, a sand collecting hopper 282, a regenerated sand bin 29, an emptying pipeline 30, a dust removing net 31 and an air inlet 32.

Detailed Description

The utility model is further illustrated with reference to the following figures and examples.

As shown in fig. 1, the multistage regeneration treatment device for composite recycled molding sand in this embodiment mainly includes three mechanisms, namely, a pretreatment mechanism for waste sand, a mechanical treatment mechanism for waste sand, and a thermal treatment mechanism for waste sand, wherein the three mechanisms can operate independently or in series;

The mechanical treatment mechanism for the waste sand is arranged behind the pretreatment mechanism and comprises a magnetic separation mechanism and a grinding mechanism; the bottom of the waste sand mixing bin 3 is provided with a vibrating motor 5, a spiral feeder 6 is arranged below an outlet, the spiral feeder is connected with a magnetic separator which is used for lifting the mixed waste sand to a high position through a lifting pipeline 7, the outlet of the lifting pipeline 7 is opposite to a first-stage conveying belt 8, a first-stage magnetic separator is arranged on the first-stage conveying belt 8 and comprises a first-stage magnetic roller 9, a scraping plate 10 arranged below the first-stage magnetic roller and a selection slag hopper 11, and the selection slag hopper 11 is externally connected with a slag discharging pipeline 12; a semi-sealed conveying groove 13 is arranged at the blanking end of the first-level magnetic roller 9, the outlet of the conveying groove 13 is over against a second-level conveying belt 14, the second-level conveying belt 14 is provided with a second-level magnetic separator, and the structure of the second-level conveying belt is consistent with that of the first-level magnetic separator.

A spiral feeder 6 is arranged at an outlet of the magnetic separator and is connected with a used sand roasting mechanism, and the used sand roasting mechanism comprises a conveying pipe 15, a gas pipeline 16, a hot blast stove 17, a drum-type roasting furnace 18, a discharge port 19 and a dust removal mechanism 20; the conveying groove 13 of the secondary magnetic separator is connected with the temporary storage bin 21 and then enters the drum-type roasting furnace 18 through the conveying pipe 15; meanwhile, a hot air pipe of a hot air furnace 17 is also connected to the drum-type roasting furnace 18 and is positioned below the conveying pipe 15, the recovered sand is added from a high position, and hot air enters from a low position and is in countercurrent contact with the recovered sand; the gas pipeline 16 extends into the roller roasting furnace 18 from the discharge port 19 and is connected with combustion nozzles 161 which are uniformly distributed in the furnace body, and a spiral sand-making plate is arranged on the inner wall of the roller roasting furnace 18 and is used for turning the recovered sand continuously along with the rotation of the roller roasting furnace 18 to increase the contact surface; the recovered sand moves towards the discharge port 19 under the action of gravity along with the rotation of the roller type roasting furnace 18, and is directly heated by high-temperature combustion gas sprayed by the combustion nozzle 161 in the process of moving forwards in the cylinder, so that organic matters contained in the recovered sand and adhered substances on the surface of sand grains are burned, and a mechanical treatment mechanism can conveniently remove the recovered sand; the burned recovered sand moves to a discharge port 19, is discharged at regular time and is sent out by a belt conveyor or a spiral conveyor; the hot air and the waste gas generated by combustion fed into the furnace are treated by a dust removing mechanism 20 arranged at the tail end of the roller type roasting furnace 18 and then discharged.

A discharge port 19 of the roller type roasting furnace 18 is connected to a cooling tower 22, and the recovered sand is cooled to a proper temperature and then enters a mechanical treatment mechanism, namely a used sand grinding machine, through a pipeline; the used sand grinder includes a grinding box 23 and a grinding shaft 24 which are installed together but independently rotate in opposite directions, and other auxiliary members including a bracket 25, a supporting shaft 26, and a driving motor 27; the two ends of the bracket 25 are respectively fixed with the grinding box 23 and a driving motor 27 and a protective cover 28 of the grinding shaft 24; the grinding box 23 and the grinding shaft 24 are both arranged in a protective cover 28, wherein the grinding box 23 is supported by a left supporting shaft 26 and connected to a left driving motor 27, and a grinding layer formed by bonding carborundum is arranged on the inner wall of the grinding box 23 to grind the surface of used sand entering the grinding box; the grinding shaft 24 is integrally installed inside the grinding box 23, but the front end of the grinding shaft 24 is not contacted with the left end part of the grinding box 23, the rear end of the grinding shaft 24 passes through the right end plate of the grinding box 23 and then is connected with the right supporting shaft 26 and then is connected to the right driving motor 27, stirring shafts 241 are uniformly distributed on the grinding shaft 24 in a staggered manner, and the length of each stirring shaft 241 does not exceed the distance from the grinding shaft 24 to the inner wall of the grinding box 23; a sand inlet 281 is formed in the top of the protective cover 28, the upper end of the protective cover is connected with an outlet of the cooling tower 22, the lower end of the protective cover is opposite to a lower sand port 231 arranged on the grinding box 23, a valve capable of being opened and closed is arranged on the lower sand port 231, and the valve is opened during blanking or discharging and closed during grinding; a sand collecting hopper 282 is provided below the grinding box 23, a screw feeder is provided below an opening of the sand collecting hopper 282, and the screw feeder feeds the processed recovered sand into the reclaimed sand silo 29 for storage.

Example 2

As shown in fig. 2, this embodiment a multistage regeneration processing apparatus of molding sand is retrieved to combined type, its structure is consistent with embodiment 1 basically, the difference lies in, evacuation pipeline 30 is seted up to magnetic separation ware's side, and evacuation pipeline 30 links to each other with the space that the magnetic separation ware below is loudspeaker form, sets up a plurality of layers of dust removal net 31 in this space, and its below sets up the deposition bucket, and the other end in this loudspeaker form space sets up air inlet 32, fills air, blows the easy ash layer that raises in the waste residue of clearing up and separates out after dust removal net 31 keeps apart and collect.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the utility model. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. The utility model provides a multistage regeneration processing apparatus of molding sand is retrieved to combined type, mainly includes triplex mechanism, and one is the pretreatment mechanism of useless sand, and two is the mechanical processing mechanism of useless sand, and three are useless sand thermal method processing mechanism, its characterized in that: the three mechanisms can operate independently or in series;

the pretreatment mechanism comprises a clay waste sand collecting tank (1) and a resin waste sand collecting tank (2), the clay waste sand collecting tank and the resin waste sand collecting tank are connected with a conveyor and are connected to a waste sand mixing bin (3) through pipelines, wherein a primary crushing mechanism (4) is arranged between the resin waste sand collecting tank (2) and the waste sand mixing bin (3) and is used for primarily crushing blocky resin waste sand;

the bottom of the waste sand mixing bin (3) is provided with a vibrating motor (5), a spiral feeder (6) is arranged below an outlet, the spiral feeder is connected with a magnetic separation separator which lifts mixed waste sand to a high position through a lifting pipeline (7), the outlet of the lifting pipeline (7) is right opposite to a first-stage conveying belt (8), a first-stage magnetic separator is arranged on the first-stage conveying belt (8) and comprises a first-stage magnetic roller (9), a scraping plate (10) and a selected slag hopper (11) which are arranged below the first-stage magnetic roller, and the selected slag hopper (11) is externally connected with a slag discharging pipeline (12); a semi-sealed conveying groove (13) is arranged at the blanking end of the primary magnetic roller (9), the outlet of the conveying groove (13) is over against the secondary conveying belt (14), the secondary conveying belt (14) is provided with a secondary magnetic separator, and the structure of the secondary magnetic separator is consistent with that of the primary magnetic separator;

a spiral feeder (6) is arranged at an outlet of the magnetic separator and is connected with a used sand roasting mechanism, and the used sand roasting mechanism comprises a conveying pipe (15), a gas pipeline (16), a hot blast stove (17), a drum-type roasting furnace (18), a discharge hole (19) and a dust removal mechanism (20);

a conveying groove (13) of the secondary magnetic separator is connected with a temporary storage bin (21) and then enters a roller type roasting furnace (18) through a conveying pipe (15); meanwhile, a hot air pipe of a hot air furnace (17) is also connected to the drum-type roasting furnace (18) and is positioned below the material conveying pipe (15), the recovered sand is added from a high position, and hot air enters from a low position and is in countercurrent contact with the recovered sand; the gas pipeline (16) extends into the roller-type roasting furnace (18) from the discharge hole (19) and is connected with combustion nozzles (161) uniformly distributed in the furnace body; the recovered sand moves towards the discharge port (19) under the action of gravity along with the rotation of the roller type roasting furnace (18), and is directly heated by high-temperature combustion gas sprayed by the combustion nozzle (161) in the process of moving forwards in the cylinder, so that organic matters contained in the recovered sand and adhered substances on the surface of sand grains are burned, and a mechanical treatment mechanism can conveniently remove the recovered sand; the burned recovered sand moves to a discharge port (19), is discharged at regular time and is sent out by a belt conveyor or a spiral conveyor; the hot air sent into the furnace and the waste gas generated by combustion are discharged after being processed by a dust removal mechanism (20) arranged at the tail end of the roller type roasting furnace (18);

a discharge port (19) of the roller type roasting furnace (18) is connected to a cooling tower (22), and the recovered sand is cooled to a proper temperature and then enters a mechanical treatment mechanism, namely a used sand grinder;

the used sand grinder comprises a grinding box (23) and a grinding shaft (24) which are installed together but independently rotate in opposite directions, and other auxiliary components comprising a bracket (25), a supporting shaft (26) and a driving motor (27); two ends of the bracket (25) are respectively fixed with a grinding box (23), a driving motor (27) of a grinding shaft (24) and a protective cover (28); the grinding box (23) and the grinding shaft (24) are both arranged in a protective cover (28), wherein the grinding box (23) is supported by a left supporting shaft (26) and connected to a left driving motor (27), the grinding shaft (24) is integrally arranged in the grinding box (23), but the front end of the grinding shaft is not contacted with the left end part of the grinding box (23), and the rear end of the grinding shaft (24) passes through a right end plate of the grinding box (23) and then is connected with a right supporting shaft (26) and then is connected to a right driving motor (27); a sand inlet (281) is formed in the top of the protective cover (28), the upper end of the protective cover is connected with an outlet of the cooling tower (22), the lower end of the protective cover is opposite to a lower sand port (231) arranged on the grinding box (23), a valve capable of being opened and closed is arranged on the lower sand port (231), and the valve is opened during blanking or discharging and closed during grinding; a sand collecting hopper (282) is arranged below the grinding box (23), a spiral conveyor is arranged below an opening of the sand collecting hopper (282), and the spiral conveyor conveys the treated recovered sand into a regenerated sand bin (29) for storage.

2. The apparatus for multi-stage reclamation of composite reclaimed molding sand according to claim 1, wherein the drum roaster (18) has a spiral shoveling plate mounted on an inner wall thereof, and the reclaimed sand is turned over to increase a contact surface as the drum roaster (18) rotates.

3. The apparatus for the multi-stage reclamation of the composite reclaimed molding sand according to claim 1, wherein the stirring shafts (241) are uniformly distributed on the grinding shaft (24) in a staggered manner, and the length of the stirring shafts (241) does not exceed the distance from the grinding shaft (24) to the inner wall of the grinding box (23).

4. The apparatus for the multi-stage reclamation of the composite reclaimed molding sand according to claim 1, wherein the grinding box (23) is provided on the inner wall thereof with a grinding layer bonded with diamond grains for grinding the surface of used sand introduced thereinto.

5. The multistage regeneration treatment device for the composite recovered molding sand according to claim 1, wherein an emptying pipeline (30) is arranged on the side of the magnetic separator, the emptying pipeline (30) is connected with a trumpet-shaped space below the magnetic separator, a plurality of layers of dust removing nets (31) are arranged in the space, an ash depositing hopper is arranged below the space, an air inlet (32) is arranged at the other end of the trumpet-shaped space, air is filled into the trumpet-shaped space, an easily-raised ash layer in the cleaned waste residue is blown and separated out through the dust removing nets (31) for collection.