A fly ash recycling pretreatment device

Abstract

The utility model relates to the technical field of fly ash, and specifically proposes a fly ash recycling pretreatment device, including a drying box, a first conveying box, a screening box, and a second conveying box. The screening box is vertically arranged, and a drying box and a first conveying box are arranged above the screening box. The second conveying box is vertically arranged on the side of the screening box. The drying box, the first conveying box, and the screening box are connected in sequence. The screening box is provided with a first crushing chamber, a second crushing chamber, and a screening chamber. The lower part of the first crushing chamber and the lower part of the second crushing chamber are both connected with the screening chamber. The second crushing chamber is connected with the upper end of the second conveying box, and the screening chamber is connected with the lower end of the second conveying box. A screening assembly is obliquely arranged in the screening chamber, and a heat conducting pipe is arranged around the drying interlayer of the drying box, and an electric heating wire is arranged around the box interlayer of the first conveying box. In this device, the three processes of drying, crushing, and screening are integrated, which reduces the long-distance transportation of fly ash, reduces the cost of fly ash pretreatment, and improves the efficiency of fly ash pretreatment.

Description

Technical Field

[0001] The utility model relates to the technical field of fly ash, and specifically proposes a fly ash recycling pretreatment device. Background Art

[0002] Fly ash is the fine ash collected from the flue gas after coal combustion. It is the main solid waste discharged by coal-fired power plants. However, fly ash can be used as a resource, such as as an admixture for concrete and made into fly ash bricks.

[0003] Fly ash needs to be pretreated before it can be put into use again. The pretreatment of fly ash includes drying, crushing, screening and other pretreatment steps. At the same time, these steps need to be completed using a variety of pretreatment devices. Since most of these pretreatment devices are independently set up, the product processed by each device needs to be transferred to the next processing device. Fly ash needs to be transferred multiple times to complete the pretreatment, which increases the process and cost of fly ash pretreatment and reduces the efficiency of fly ash pretreatment. Utility Model Content

[0004] The utility model aims to provide a fly ash recycling pretreatment device to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A fly ash recycling pretreatment device comprises a drying box, a first conveying box, a screening box and a second conveying box. The screening box is vertically arranged, the drying box and the first conveying box are arranged above the screening box, the second conveying box is vertically arranged on the side of the screening box, the drying box, the first conveying box and the screening box are connected in sequence, a first crushing chamber, a second crushing chamber and a screening chamber are arranged inside the screening box, the lower part of the first crushing chamber and the lower part of the second crushing chamber are both connected to the screening chamber, the second crushing chamber is connected to the upper end of the second conveying box, the screening chamber is connected to the lower end of the second conveying box, a screening assembly is obliquely arranged in the screening chamber, the drying box is provided with a drying interlayer, a heat conducting pipe is arranged around the drying interlayer, the first conveying box is provided with a box body interlayer, and an electric heating wire is arranged around the box body interlayer.

[0007] Furthermore, the drying box includes a drying box body, a stirring shaft, and a drying motor. The drying box body is provided with a drying interlayer. The heat conduction pipe is spirally arranged in the drying interlayer along the circumferential direction. The stirring shaft is arranged in parallel inside the drying box. Both ends of the stirring shaft are rotatably connected to both ends of the drying box. A plurality of stirring rods are evenly spaced on the side of the stirring shaft. A drying motor is installed on one end above the drying box body close to the stirring driven wheel. The drying motor is transmission-connected to the stirring shaft by a belt drive.

[0008] Furthermore, a drying inlet is provided in the middle of the upper part of the drying box, a drying outlet is provided on the right side of the lower part of the drying box, an exhaust port is provided at one end of the upper part of the drying box away from the drying motor, and the exhaust port is provided to penetrate into the interior of the drying box. The drying box also includes an air valve and a material valve. The air valve is arranged at the exhaust port, and the material valve is arranged at the drying outlet.

[0009] Furthermore, the first conveying box includes a first conveying box body, a spiral shaft, and a first conveying motor. A conveying inlet is provided at the upper part of one end of the first conveying box body, and the conveying inlet is connected to the drying outlet. A conveying outlet is provided at the lower part of the other end of the first conveying box. The first conveying box body is provided with a box body interlayer. The heating wire is spirally arranged in the box body interlayer along the circumferential direction. The spiral shaft is horizontally arranged inside the first conveying box body. Both ends of the spiral shaft are rotatably connected to both ends of the first conveying box body. A spiral blade is arranged on the spiral shaft. The first conveying motor is installed at one end of the top of the screening box away from the dryer. The first conveying motor is transmission-connected to the spiral shaft through a belt drive.

[0010] Furthermore, the screening box includes a screening box body, a crushing roller, and a pulverizing roller. The first pulverizing chamber is arranged on the upper part of the screening box away from the drying box, the second pulverizing chamber is arranged on the upper part of the screening box close to the drying box, the crushing roller is arranged in the first pulverizing chamber, the crushing roller is rotatably connected to the screening box body, and the pulverizing roller is arranged in the second pulverizing chamber, the pulverizing roller is rotatably connected to the screening box body.

[0011] Furthermore, a crushing inlet is opened on the side of the top of the screening box away from the drying box, a crushing inlet is opened on the upper part of the side of the screening box close to the drying box, a large particle outlet is opened on the middle part of the side of the screening box close to the drying box, a secondary outlet is opened on the lower part of the side of the screening box close to the drying box, and a primary outlet is opened at the bottom of the screening box. The screening box also includes a guide plate, which is obliquely arranged below the crushing inlet and extends to the middle of a pair of crushing rollers.

[0012] Furthermore, the screening assembly includes a first screening plate and a second screening plate, the first screening plate is tiltedly arranged in the middle of the screening box, the lower end of the first screening plate is located below the large particle outlet, the second screening plate is tiltedly arranged in the lower part of the screening box, the lower end of the second screening plate is located below the secondary outlet, buffer springs are arranged at the four corners above the first screening plate, the buffer springs above the first screening plate are fixedly connected to the inner wall of the middle part of the screening box, buffer springs are arranged at the four corners above the second screening plate, the buffer springs above the second screening plate are fixedly connected to the inner wall of the lower part of the screening box, a first vibrator is arranged below the higher end of the first screening plate, and a second vibrator is arranged below the higher end of the second screening plate.

[0013] Furthermore, the angle between the horizontal planes of the first screen plate is 15° to 30°, the sieve holes of the second screen plate are smaller than the sieve holes of the first screen plate, the angle between the second screen plate and the horizontal plane is 15° to 30°, and the second screen plate is arranged parallel to the first screen plate.

[0014] Furthermore, the second conveying box includes a second conveying box body, a conveying shaft, a movable switch, and a second conveying motor. The conveying shaft is vertically arranged inside the second conveying box body, and both ends of the conveying shaft are rotatably connected to both ends of the second conveying box body. Two spiral blades are arranged on the conveying shaft. A second conveying motor is installed on the upper part of the side of the second conveying box body away from the screening box, and the second conveying motor is connected to the conveying shaft through belt drive.

[0015] Furthermore, a hard object outlet is opened at the lower part of the side of the second conveying box away from the screening box, and a movable switch is arranged at the hard object outlet. The movable switch includes a baffle, a piston rod, and a cylinder. The cylinder is installed above the hard object outlet. The baffle is fixedly connected to the piston rod, and the baffle is inserted into the groove outside the hard object outlet.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The utility model provides a fly ash recycling pretreatment device, in which the three processes of drying, crushing and screening are integrated and performed in sequence, making the process compact, the various devices are integrated and the structure is compact, which reduces the long-distance transportation of fly ash between various processes during the pretreatment process, reduces the fly ash pretreatment cost, and improves the fly ash pretreatment efficiency.

[0018] 2. The utility model provides a fly ash recycling pretreatment device, in which the heat-conducting pipes in the interlayer of the drying box are arranged in a spiral shape along the circumferential direction, so that the fly ash in the drying box is heated evenly and the dehumidification effect is good. The stirring shaft stirs the input raw materials to reduce agglomeration, so that the fly ash can be dried evenly. The electric heating wire in the first conveying box is arranged in a spiral shape along the circumferential direction to assist in further drying of the fly ash. The spiral shaft stirs the fly ash while conveying it, further increasing the dehumidification effect.

[0019] 3. The utility model provides a fly ash recycling pretreatment device, in which the second conveying box conveys the large particles of fly ash that have not passed the first screening plate to the crushing roller for secondary crushing. The crushed product is screened by the first screening plate again, and the large particles of fly ash that have not passed the first screening plate are recycled through the above operation, so that the fly ash dry material is crushed more thoroughly and the material utilization rate is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the external structure of an embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of an embodiment of the utility model;

[0022] Figure 3 for Figure 2 Schematic diagram of the local cross-section structure in the AA direction;

[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of the drying part of an embodiment of the utility model;

[0024] Figure 5 It is a schematic diagram of the cross-sectional structure of the secondary crushing part of an embodiment of the utility model.

[0025] In the figure: 1. drying box; 11. drying box body; 111. drying inlet; 112. drying interlayer; 113. heat pipe; 114. drying outlet; 115. exhaust port; 12. stirring shaft; 121. stirring driven wheel; 122. stirring rod; 13. air valve; 14. drying motor; 141. stirring driving wheel; 142. first belt; 15. material valve; 2. first conveying box; 21. first conveying box body; 211. conveying inlet; 212. box body interlayer; 213. heating wire; 214. conveying outlet; 22. spiral shaft; 221. first driven wheel; 23. first conveying motor; 231. first driving wheel; 232. second belt; 3. screening box; 301. first crushing chamber; 302. second crushing chamber; 303. screening chamber; 3 1. Screening box; 311. Crushing inlet; 312. Crushing inlet; 313. Large particle outlet; 314. Secondary outlet; 315. Primary outlet; 316. First support plate; 317. Second support plate; 318. Guide plate; 32. Crushing roller; 33. Crushing roller; 34. Screening assembly; 341. First screening plate; 342. Second screening plate; 343. Buffer spring; 344. First vibrator; 345. Second vibrator; 35. Support foot; 4. Second conveying box; 41. Second conveying box; 411. Hard object outlet; 42. Conveying shaft; 421. Second driven wheel; 43. Movable switch; 431. Baffle; 432. Piston rod; 433. Cylinder; 44. Second conveying motor; 441. Second driving wheel; 442. Third belt. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In the following description of the utility model, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. The term "connection" only indicates the connection between devices and has no special meaning.

[0028] In addition, the technical fields and installation methods involved in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] Specific implementation: Please refer to Figure 1-Figure 5 A fly ash recycling pretreatment device comprises a drying box 1, a first conveying box 2, a screening box 3, and a second conveying box 4. The screening box 3 is vertically arranged, the drying box 1 and the first conveying box 2 are arranged above the screening box 3, the second conveying box 4 is vertically arranged on the side of the screening box 3, the drying box 1, the first conveying box 2 and the screening box 3 are connected in sequence, the screening box 3 is provided with a first crushing chamber 301, a second crushing chamber 302 and a screening chamber 303, the first crushing chamber 301 is lower than the first crushing chamber 301, and the second crushing chamber 302 is lower than the first crushing chamber 303. The first conveying box 2 is provided with a box body interlayer 212, and the second conveying box 2 is provided with a box body interlayer 212. The electric heating wire 213 is arranged around the box body interlayer 212.

[0030] Furthermore, the drying box 1 includes a drying box body 11, a stirring shaft 12, an air valve 13, a drying motor 14, and a material valve 15. A drying inlet 111 is provided in the middle of the upper part of the drying box body 11, and a drying outlet 114 is provided on the right side of the lower part of the drying box body 11. A drying interlayer 112 is provided in the drying box body 11. A heat conducting pipe 113 is spirally provided in the drying interlayer 112 along the circumferential direction. Hot air or hot water, heat conducting oil and other media are passed through the heat conducting pipe 113 to uniformly heat the inside of the drying box 1. The stirring shaft 12 is horizontally provided in the drying box 1, and both ends of the stirring shaft 12 are rotatably connected to both ends of the drying box body 11. One end of the stirring shaft 12 passes through the drying box body 11 and is fixedly provided with a stirring driven wheel 121. A plurality of stirring rods 122 are evenly spaced along the axial direction of the stirring shaft 12. A drying motor is installed at one end of the upper outer surface of the drying box body 11 close to the stirring driven wheel 121. The drying machine 14 is provided with a stirring driving wheel 141 fixedly arranged on the output shaft of the drying motor 14. The stirring driving wheel 141 is connected to the stirring driven wheel 121 through a first belt 142. An exhaust port 115 is provided at one end of the upper part of the drying box body 11 away from the drying motor 14, which passes through the interior of the drying box body 11. The air valve 13 is arranged at the exhaust port 115. The water vapor generated by drying enters the exhaust port 115 and leaves through the air valve 13. The material valve 15 is arranged at the drying outlet 114 to control the connection between the drying box 1 and the first conveying box 2. The drying motor 14 is started, and the stirring driving wheel 141 drives the stirring driven wheel 121 to rotate through the first belt 142. The stirring shaft 12 rotates following the stirring driven wheel 121. The stirring rod 122 stirs the fly ash. At the same time, hot air or hot water, heat transfer oil and other media are introduced into the heat pipe 113 to heat the interior of the drying box 1.

[0031] Furthermore, the first conveying box 2 includes a first conveying box body 21, a spiral shaft 22, and a first conveying motor 23. A conveying inlet 211 is provided at the upper portion of one end of the first conveying box body 21. The conveying inlet 211 is connected to the drying outlet 114. The preliminarily dried fly ash enters the first conveying box 2 through the conveying inlet 211. A conveying outlet 214 is provided at the lower portion of the other end of the first conveying box body 21. The first conveying box body 21 is provided with a box body interlayer 212. The heating wire 213 is spirally arranged in the box body interlayer 212 along the circumferential direction. The heating wire 213 is energized to release heat to heat the inside of the first conveying box 2. The spiral shaft 22 is horizontally arranged inside the first conveying box body 21. Both ends of the spiral shaft 22 are rotatably connected to both ends of the first conveying box body 21. One end of the spiral shaft 22 A first driven wheel 221 is fixedly arranged on the first conveying box body 21, a spiral blade 1 is arranged on the spiral shaft 22, and the edge of the spiral blade contacts the inner wall of the first conveying box body 21, a first conveying motor 23 is installed on the top end of the screening box 3 away from the drying box 1, a first driving wheel 231 is fixedly arranged on the output shaft of the first conveying motor 23, the first driving wheel 231 and the first driven wheel 221 are connected through a second belt 232, the first conveying motor 23 is started, the first driving wheel 231 drives the first driven wheel 221 to rotate through the second belt 232, the spiral shaft 22 rotates with the first driven wheel 221, and the fly ash is transported to the conveying outlet 214 while stirring the fly ash, and the heating wire 213 heats the inside of the first conveying box 2 after being energized.

[0032] Furthermore, the screening box 3 includes a screening box body 31, a crushing roller 32, a crushing roller 33, a screening assembly 34, and a support leg 35. Four support legs 35 are provided at the bottom of the screening box body 31 to support the entire device. The first crushing chamber 301 is provided at the upper part of the screening box 3 away from the drying box 1, and the second crushing chamber 302 is provided at the upper part of the screening box 3 close to the drying box 1. A crushing inlet 311 is provided at the side of the top of the screening box body 31 away from the drying box 1. The crushing inlet 311 is connected to the conveying outlet 214 at the top and connected to the first crushing chamber 301 at the bottom. The fly ash dried for the second time enters the crushing chamber 301 through the crushing inlet 311. The fly ash is first crushed into the first crushing chamber 301, and a pair of crushing rollers 32 are arranged below the crushing entrance 311 in the first crushing chamber 301. The crushing rollers 32 are rotatably connected to the screening box 31, and the crushing rollers 32 perform initial crushing on the secondary dried fly ash. A crushing entrance 312 is provided on the upper part of one side of the screening box 31 close to the drying box 1. One side of the crushing entrance 312 is connected to the upper end of the second conveying box 4, and the other side is connected to the upper end of the second crushing chamber 302. A pair of crushing rollers 33 are arranged in the second crushing chamber 302, and the crushing rollers 33 are rotatably connected to the screening box 31, and the crushing rollers 33 perform secondary crushing on large-particle fly ash.

[0033] Furthermore, a large particle outlet 313 is provided at the middle of one side of the screening box 31 close to the drying box 1, one side of the large particle outlet 313 is connected to the lower end of the second conveying box 4, and the other side is connected to the screening chamber 303, a secondary outlet 314 is provided at the lower part of one side of the screening box 31 close to the drying box 1, and a primary outlet 315 is provided at the bottom of the screening box 31, and the secondary outlet 314 and the primary outlet 315 are used to discharge fly ash of different levels of fineness, and a first outlet 315 is provided at the top of the screening box 3 away from the first conveying motor 23. A support plate 316, the upper end of the first support plate 316 is fixedly connected to the drying box 1, and is used to support the drying box 1. A second support plate 317 is provided on the top of the screening box 3 near the first support plate 316. The upper end of the second support plate 317 is fixedly connected to the first conveying box 2, and is used to support the first conveying box 2. The screening box body 31 also includes a guide plate 318, which is obliquely arranged below the crushing inlet 312 and extends to the middle of a pair of crushing rollers 33 to guide large particles of fly ash to fall to the middle of the crushing rollers 33.

[0034] Furthermore, the screening assembly 34 includes a first screening plate 341, a second screening plate 342, a buffer spring 343, a first vibrator 344, and a second vibrator 345. The first screening plate 341 is tiltedly arranged in the middle of the screening box 31, and the lower end of the first screening plate 341 is located below the large particle outlet 313. The second screening plate 342 is tiltedly arranged in the lower part of the screening box 31, and the lower end of the second screening plate 342 is located below the secondary outlet 314. There are eight buffer springs 343, and the four corners above the first screening plate 341 are all arranged. There is a buffer spring 343, the buffer spring 343 above the first screening plate 341 is fixedly connected to the middle inner wall of the screening box 31, the four corners above the second screening plate 342 are provided with buffer springs 343, the buffer spring 343 above the second screening plate 342 is fixedly connected to the lower inner wall of the screening box 31, the first vibrator 344 is arranged below the higher end of the first screening plate 341 and is installed on the inner side of the screening box 31, and the second vibrator 345 is arranged below the higher end of the second screening plate 342 and is installed on the inner side of the screening box 31.

[0035] Furthermore, the angle between the first screening plate 341 and the horizontal plane is 15° to 30°, and the first vibrator 344 is started to control the first screening plate 341 to vibrate up and down along the buffer spring 343 to screen large particles of fly ash and small particles of fly ash. While the first screening plate 341 is vibrating, the large particles of fly ash move along the first screening plate 341 and enter the large particle outlet 313, and the small particles of fly ash pass through the first screening plate 341 and fall onto the second screening plate 342.

[0036] Furthermore, the sieve holes of the second sieve plate 342 are smaller than the sieve holes of the first sieve plate 341, the angle between the second sieve plate 342 and the horizontal plane is 15° to 30°, the second sieve plate 342 is arranged parallel to the first sieve plate 341, the second vibrator 345 is started to control the second sieve plate 342 to vibrate up and down along the buffer spring 343, and the small-particle fly ash is screened into fly ash of different levels of fineness, and the fly ash of different levels of fineness is discharged from the secondary outlet 314 and the primary outlet 315 respectively.

[0037] Furthermore, the second conveying box 4 includes a second conveying box body 41, a conveying shaft 42, an active switch 43, and a second conveying motor 44. A hard object outlet 411 is provided at the lower part of the side of the second conveying box body 41 away from the screening box 3, and large particles of fly ash that cannot be crushed leave from the hard object outlet 411. The conveying shaft 42 is vertically arranged inside the second conveying box body 41, and both ends of the conveying shaft 42 are rotatably connected to both ends of the second conveying box body 41. One end of the conveying shaft 42 passes through the second conveying box body 41 and is fixedly provided with a second driven wheel 421. A spiral blade 2 is provided on the conveying shaft 42, and the edge of the spiral blade is in contact with the inner wall of the second conveying box body 41. A second conveying motor 44 is installed at the upper part of the side of the second conveying box body 41 away from the screening box 3. A second driving wheel 441 is fixedly provided on the output shaft of the second conveying motor 44, and the second driving wheel 441 is connected to the second driven wheel 421 is connected through the third belt 442 for transmission, the second conveying motor 44 is started, the second driving wheel 441 drives the second driven wheel 421 to rotate through the third belt 442, the conveying shaft 42 rotates following the second driven wheel 421, and the large-particle fly ash is conveyed from the large-particle outlet 313 to the crushing inlet 312, and the large-particle fly ash enters the second crushing chamber 302, and the movable switch 43 is arranged at the hard object outlet 411. The movable switch 43 includes a baffle 431, a piston rod 432, and a cylinder 433. The cylinder 433 is installed above the hard object outlet 411. The baffle 431 is fixedly connected to the piston rod 432 to control the lifting and lowering of the baffle 431. The baffle 431 is inserted into the groove on the outside of the hard object outlet 411. When the movable switch 43 is started, the piston rod 432 drives the baffle 431 to rise, opens the hard object outlet 411, and discharges the large-particle fly ash that cannot be crushed.

[0038] Working principle of a fly ash recycling pretreatment device:

[0039] The collected fly ash enters the drying box 1 through the drying inlet 111, and hot air or hot water, heat transfer oil and other media are introduced into the heat pipe 113 to heat the drying box 1. The drying motor 14 drives the stirring shaft 12 to stir the fly ash, so that the fly ash in the drying box 1 is evenly heated and the drying is accelerated. After drying, the evaporated water vapor leaves through the air valve 13 along the exhaust port 115, and the material valve 15 is opened. The fly ash after preliminary drying enters the first conveying box 2, and the first conveying motor 23 drives the spiral shaft 22 to convey the preliminary dried fly ash and stir the preliminary dried fly ash at the same time. The electric heating wire 213 heats the first conveying box 2, and the preliminary dried fly ash is dried for a second time. The secondary dried fly ash leaves the first conveying box 2, enters the screening box 3 from the crushing inlet 311, is crushed by the crushing roller 32, and falls onto the first screening plate 341 for large particles. The large-particle fly ash and small-particle fly ash are screened, and the large-particle fly ash enters the second conveying box 4 through the large-particle outlet 313 along the first screening plate 341. The second conveying motor 44 drives the conveying shaft 42 to convey the large-particle fly ash into the crushing inlet 312. The large-particle fly ash falls to the crushing roller 33 along the guide plate 318 for secondary crushing, and the crushed product falls to the first screening plate 341 and is screened again. The large particles undergo the above cycle, and the movable switch 43 is started to control the baffle 431 to rise, opening the hard object outlet 411. The large-particle fly ash that cannot be crushed leaves through the hard object outlet 411, and the small-particle fly ash passes through the first screening plate 341 and falls to the second screening plate 342, and the fly ash of different fineness levels is screened. The fly ash of different fineness levels is discharged from the secondary outlet 314 and the primary outlet 315 respectively, completing the pretreatment of fly ash reuse.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fly ash recycling pretreatment device, characterized in that: The invention comprises a drying box (1), a first conveying box (2), a screening box (3), and a second conveying box (4); the screening box (3) is arranged vertically; the drying box (1) and the first conveying box (2) are arranged above the screening box (3); the second conveying box (4) is arranged vertically on the side of the screening box (3); the drying box (1), the first conveying box (2) and the screening box (3) are connected in sequence; a first crushing chamber (301), a second crushing chamber (302) and a screening chamber (303) are arranged inside the screening box (3); the lower part of the first crushing chamber (301) and the lower part of the second crushing chamber (302) are arranged on the inside of the screening box (3); The lower part of the cavity (302) is communicated with the screening cavity (303), the second crushing cavity (302) is communicated with the upper end of the second conveying box (4), the screening cavity (303) is communicated with the lower end of the second conveying box (4), a screening assembly (34) is obliquely arranged in the screening cavity (303), the drying box (1) is provided with a drying interlayer (112), a heat conducting pipe (113) is arranged around the drying interlayer (112), and the first conveying box (2) is provided with a box body interlayer (212), and an electric heating wire (213) is arranged around the box body interlayer (212).

2. A fly ash recycling pretreatment device according to claim 1, characterized in that; The drying box (1) comprises a drying box body (11), a stirring shaft (12), and a drying motor (14); the drying box body (11) is provided with a drying interlayer (112); a heat conduction pipe (113) is arranged in a spiral shape in the drying interlayer (112) along the circumferential direction; the stirring shaft (12) is arranged horizontally inside the drying box (1); both ends of the stirring shaft (12) are rotatably connected to both ends of the drying box body (11); a plurality of stirring rods (122) are evenly spaced on the side of the stirring shaft (12); a drying motor (14) is installed on one end of the upper outer surface of the drying box body (11); and the drying motor (14) is transmission-connected to the stirring shaft (12) by means of a belt drive.

3. A fly ash recycling pretreatment device according to claim 2, characterized in that; A drying inlet (111) is provided in the middle of the upper part of the drying box (11), a drying outlet (114) is provided on the right side of the lower part of the drying box (11), an exhaust port (115) is provided at one end of the upper part of the drying box (11) away from the drying motor (14), and the exhaust port (115) is connected to the interior of the drying box (11). The drying box (1) also comprises an air valve (13) and a material valve (15), wherein the air valve (13) is arranged at the exhaust port (115), and the material valve (15) is arranged at the drying outlet (114).

4. A fly ash recycling pretreatment device according to claim 1, characterized in that: The first conveying box (2) comprises a first conveying box body (21), a spiral rotating shaft (22), and a first conveying motor (23). A conveying inlet (211) is provided at the upper part of one end of the first conveying box body (21), and the conveying inlet (211) is communicated with a drying outlet (114). A conveying outlet (214) is provided at the lower part of the other end of the first conveying box body (21). The first conveying box body (21) is provided with a box body interlayer (212). The electric heating wire (213) is circumferentially spirally arranged in the box body interlayer (212). The spiral rotating shaft (22) is horizontally arranged inside the first conveying box body (21). Both ends of the spiral rotating shaft (22) are rotatably connected to both ends of the first conveying box body (21). A spiral blade (1) is arranged on the spiral rotating shaft (22). The first conveying motor (23) is installed at one end of the top of the screening box (3) away from the drying box (1). The first conveying motor (23) is transmission-connected to the spiral rotating shaft (22) by means of a belt transmission.

5. The fly ash recycling pretreatment device according to claim 1, characterized in that: The screening box (3) comprises a screening box body (31), a crushing roller (32), and a pulverizing roller (33); a first pulverizing chamber (301) is arranged on a side of the upper part of the screening box (3) away from the drying box (1); a second pulverizing chamber (302) is arranged on a side of the upper part of the screening box (3) close to the drying box (1); the crushing roller (32) is arranged in the first pulverizing chamber (301); the crushing roller (32) is rotatably connected to the screening box body (31); the pulverizing roller (33) is arranged in the second pulverizing chamber (302); the pulverizing roller (33) is rotatably connected to the screening box body (31).

6. A fly ash recycling pretreatment device according to claim 5, characterized in that: A crushing inlet (311) is provided at a side of the top of the screening box (31) away from the drying box (1); a pulverizing inlet (312) is provided at an upper portion of a side of the screening box (31) close to the drying box (1); a large particle outlet (313) is provided at a middle portion of a side of the screening box (31) close to the drying box (1); a secondary outlet (314) is provided at a lower portion of a side of the screening box (31) close to the drying box (1); and a primary outlet (315) is provided at the bottom of the screening box (31). The screening box (31) further comprises a guide plate (318), which is obliquely arranged below the pulverizing inlet (312) and extends toward the middle of the pair of pulverizing rollers (33).

7. The fly ash recycling pretreatment device according to claim 1, characterized in that: The screening assembly (34) comprises a first screening plate (341) and a second screening plate (342). The first screening plate (341) is arranged obliquely in the middle of the screening box (31). The lower end of the first screening plate (341) is located below the large particle outlet (313). The second screening plate (342) is arranged obliquely in the lower part of the screening box (31). The lower end of the second screening plate (342) is located below the secondary outlet (314). Buffer springs (343) are arranged at the four corners above the first screening plate (341). Buffer springs (343) are arranged at the four corners above the second screening plate (342). The buffer springs (343) are fixedly connected to the screening box (31). A first vibrator (344) is arranged below the higher end of the first screening plate (341). A second vibrator (345) is arranged below the higher end of the second screening plate (342).

8. A fly ash recycling pretreatment device according to claim 7, characterized in that: The angle between the first sieve plate (341) and the horizontal plane is 15° to 30°, the sieve holes of the second sieve plate (342) are smaller than the sieve holes of the first sieve plate (341), the angle between the second sieve plate (342) and the horizontal plane is 15° to 30°, and the second sieve plate (342) is arranged parallel to the first sieve plate (341).

9. The fly ash recycling pretreatment device according to claim 1, characterized in that: The second conveying box (4) comprises a second conveying box body (41), a conveying rotating shaft (42), a movable switch (43), and a second conveying motor (44); the conveying rotating shaft (42) is vertically arranged inside the second conveying box body (41); both ends of the conveying rotating shaft (42) are rotatably connected to both ends of the second conveying box body (41); two spiral blades are arranged on the conveying rotating shaft (42); a second conveying motor (44) is installed on the upper part of the second conveying box body (41) away from the screening box (3); and the second conveying motor (44) is transmission-connected to the conveying rotating shaft (42) by means of a belt drive.

10. A fly ash recycling pretreatment device according to claim 9, characterized in that: A hard object outlet (411) is provided at a lower portion of a side of the second conveying box (41) away from the screening box (3); a movable switch (43) is arranged at the hard object outlet (411); the movable switch (43) comprises a baffle (431), a piston rod (432), and a cylinder (433); the cylinder (433) is installed above the hard object outlet (411); the baffle (431) is fixedly connected to the piston rod (432); and the baffle (431) is inserted into a groove on the outer side of the hard object outlet (411).

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