CN108855466B

CN108855466B - Sand making machine and sand making method

Info

Publication number: CN108855466B
Application number: CN201810572246.4A
Authority: CN
Inventors: 曹瑞东; 朱翔; 马晓东; 刘宏; 陈旭; 刘洋键
Original assignee: Shanxi University
Current assignee: Shanxi University
Priority date: 2018-06-06
Filing date: 2018-06-06
Publication date: 2020-04-17
Anticipated expiration: 2038-06-06
Also published as: CN108855466A

Abstract

A sand making machine belongs to the field of building materials and comprises a crushing device, a screening device and a sand washing device, wherein the screening device is arranged below the crushing device; a sand washing device is arranged beside the screening device, the crushing device consists of a motor, a transmission belt and crushing blades, and the screening device consists of a screen, a vibration motor, a damping spring, a vibration adsorption block and a refining device; the sand washing device comprises a water inlet pipe, an upper motor, a lower motor and a rotary drum. The content of impurities such as stone powder in the produced machine-made sand is very little, the action effect of the machine-made sand can be fully exerted, and the negative influence of the impurities on the use effect of the building is avoided. Water resources used in the sand preparation process can be filtered inside the machine to achieve secondary use, so that energy is saved as much as possible, and the production cost is reduced.

Description

Sand making machine and sand making method

Technical Field

The invention belongs to the field of building materials, and particularly relates to a sand making machine and a sand making method.

Background

At present, the sand is widely applied, and plays an important role in the aspects of building, beautifying, decoration and the like. With the acceleration of the development process, the demand of the sand is rapidly increased, the requirement on the quality of the sand is severer, but the existing natural sand obviously cannot meet the supply, and the national regulations forbid the exploitation of the natural sand without permission (except for clearing the river channel), so that the gap can be made up by the occurrence of the manufactured sand.

The invention content is as follows:

in order to protect the safety of a river channel and reduce the exploitation amount of river sand, the invention aims to provide a sand making machine which can effectively remove and collect byproduct stone powder so as to produce higher-standard sand to meet the requirements of various fields

The technical scheme of the invention is as follows: a sand making machine comprises a crushing device, a screening device and a sand washing device, wherein the screening device is arranged below the crushing device; the crushing device is characterized by comprising a motor, a transmission belt and crushing blades, wherein the motor is connected with the crushing blades through the transmission belt;

the crushing blade comprises two triangle steel blocks, wherein one triangle steel block is installed in the pivot (for rotating blade), and another triangle steel block is installed in the frame (for fixed blade). The rotating blades and the fixed blades are both triangular steel blocks with triangular cross sections.

The screening device consists of a screen, a vibration motor, a damping spring, a vibration adsorption block and a refining device, wherein the periphery of the screen is provided with a screen protective edge, the damping spring is arranged between the vibration adsorption block and the screen, and the vibration adsorption block is provided with the vibration motor through a bearing; the vibration is fixed on a flat plate connected with a damping spring; a temporary storage is arranged below the screen, and a blower is arranged on the right side of the lower part of a discharge port of the temporary storage and fixed on a support welded with the shell; the air-blower sets up the collecting plate face to face, sets up the storage case below the collecting plate, and the collecting plate welds with the shell.

A conveyor belt of the refining device is arranged below the material storage box;

the refining device comprises a cam, a rotating wheel, a conveyor belt, an electrostatic transmitter and an insulating storage box, wherein the insulating storage box is provided with an observation port, the cam is connected with the rotating wheel through a belt, the upper left part of the insulating storage box is provided with the rotating wheel, the lower part of the insulating storage box is also provided with the rotating wheel, the right part of the insulating storage box is provided with the cam, the cam and the rotating wheel are connected through the conveyor belt, and an electrostatic generator is arranged near the rotating wheel; the diameter of the cam is larger than that of the rotating wheel;

the electrostatic transmitter consists of an electrostatic generating rod and a box body, the box body is provided with an adjusting knob and a display panel, and the electrostatic generating rod is connected with the adjusting knob and the display panel through wires;

the sand washing device comprises an upper motor, a lower motor and a rotary drum, wherein the upper motor is connected with a rotary shaft, and the rotary shaft is provided with a blunt knife; the lower motor shaft is welded with the cross, the cross is welded with the rotary drum, the rotary drum is provided with 4 sand outlets and a plurality of water drainage holes, and the sand outlets are provided with doors; the door is hinged with the rotating barrel framework,

the drain hole is arranged at the lower part of the rotary drum and is positioned below two thirds of the height of the rotary drum; the periphery of the wall of the rotary drum is provided with a water blocking sleeve, the water blocking sleeve can move up and down along the wall of the rotary drum, and the height of the water blocking sleeve is two thirds of that of the rotary drum; one end of the water retaining sleeve is connected with the hydraulic cylinder; the hydraulic cylinder is arranged on the bracket.

The good building stones of smashing fall to the screen cloth that has vibrating device from reducing mechanism, the screen cloth passes through four high strength spring coupling with vibrating device, shock dynamo fixes on spring coupling's flat board, drive the screen cloth vibrations with this, the net can be changed different apertures and the safe edge lower part of net leaves the breach according to different demands, a building stones for the particle diameter is greater than the aperture flows to the discharging pipe from this, collect and carry out the fine grinding once more, the building stones that are less than the aperture get into in the temporary storage storehouse, the storehouse wholly presents the inverted triangle-shaped, cross wholly by two steel sheets and enclose, lower part export in the storehouse is the slit, play the current-limiting effect, prevent that the too big influence efficiency of flow. The air blower is arranged on the right of the lower portion of the outlet, the air blower is fixed on a support welded with the shell, the wind speed is adjusted to enable too small stone powder to be blown to a collecting plate opposite to the air blower, the collecting plate is welded with the shell, and the lower storage box can collect the blown stone powder. The larger particles can fall on a conveyor belt at the lower part to carry out the next step of more refined powder removal. Refine device monolithic stationary on the support good with the shell welding, the fine mountain flour on the conveyer belt is fallen in the static absorption, lower part runner is far away from electrostatic generator electric charge quantity not enough, the mountain flour receives the power less can drop to the insulating storage case here, the runner rotates and makes the conveyer belt vibration, on this makes the mechanism sand that meets the requirements standard fall to the conveyer belt, there is the baffle conveyer belt right part, those mechanism sand that meet the requirements fall into the conveyer belt of lower part, and send it into on the special steel band. The special steel belt is composed of a plurality of sections of rectangular angle steels, the special steel belt is hinged to enable the special steel belt to rotate more conveniently, and the upper end of the special steel belt is directly inserted into the rotary drum.

The invention has the beneficial effects that: the content of impurities such as stone powder in the produced machine-made sand is very little, the action effect of the machine-made sand can be fully exerted, and the negative influence of the impurities on the use effect of the building is avoided. Water resources used in the sand preparation process can be filtered inside the machine to achieve secondary use, so that energy is saved as much as possible, and the production cost is reduced.

The wheel-mounted type large-scale machine avoids the defects of fixed position and inconvenient movement of a large-scale machine.

Description of the drawings:

fig. 1 is an external view of the present invention.

Fig. 2 is a block diagram of the present invention.

FIG. 3 is a structural view of the cleaning apparatus of the present invention.

FIG. 4 is a view showing a structure of a refining apparatus in the present invention.

Fig. 5 is a structural view of the vibrating screen of the present invention.

Fig. 6 is a structural view of a water filtering tank in the present invention.

Fig. 7 is a structural view of a blower in the present invention.

Fig. 8 is a structural view of a water flow switch in the present invention.

FIG. 9 is a structural view of the static electricity generating apparatus according to the present invention.

Fig. 10 is a structural view of the hydraulic cylinder in the present invention.

FIG. 11 is a view showing the construction of the drum and the water blocking sleeve according to the present invention.

In the figure, 1 is a water inlet, 2 is a crushing motor, 3 is a crushing device, 4 is a discharge pipe, 5 is a wheel, 6 is a door panel, 7 is a shell, 8 is a V-belt, 9 is a screening device, 10 is a baffle, 11 is a blower, 12 is a fixing buckle, 13 is a refining device, 14 is a conveyor belt, 15 is a conveyor steel belt, 16 is a discharge port, 17 is a rotary drum, 18 is an upper motor, 19 is a storage box, 20 is a rotary drum framework, 21 is a cross, 22 is a discharge door, 23 is a lower motor, 24 is a drainage groove, 25 is a sand bank, 26 is a water retaining sleeve, 27 is a motor bracket, 28 is a blunt knife, 29 is a spiral rotary shaft, 30 is a steel pipe, 31 is a backflow prevention valve, 32 is a cam, 33 is an observation port, 34 is a rotary wheel, 35 is a center bolt, 36 is a water filtering groove, 37 is a vibration absorption block, 38 is a damping spring, 39 is a vibration motor, 40 is a connecting bearing, 41 is a protective edge, 42 is a screen, 43 is a water outlet, 44 is a water filtering layer, 45 is a fan blade, 46 is a fan shell, 47 is a bracket, 48 is an air outlet, 49 is a driving wheel disc, 50 is a driven wheel disc, 51 is a stone powder collecting plate, 52 is a sand conveying plate, 53 is a rotating shaft bracket, 54 is a blade, 55 is a rotating shaft and blade meshing port, 56 is an inlet pipe, 57 is a control motor, 58 is a motor shaft, 59 is a motor limit column, 60 is an electrostatic generating rod, 61 is an electric wire, 62 is a box body, 63 is an adjusting knob, 64 is a data display panel, 65 is a water discharging hole, 66 is a hydraulic cylinder, 67 is a moving hoop, 68 is a piston rod, 69 is a contact head, 70 is a rotating blade and 71 is a fixed blade.

Detailed Description

The present invention will be described in more detail below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the sand making machine comprises a shell 7, a crushing device 3, a screening device 13 and a sand washing device, wherein wheels 5 are installed at the bottom of the shell 7, and the screening device is arranged below the crushing device; a sand washing device is arranged beside the screening device; the screening device 13 and the sand washing device are both arranged in the shell 7.

The crushing device consists of a crushing motor 2, a V-belt 8 and crushing blades; the crushing motor 2 is embedded in the shell 7 in half, so that better stability can be achieved.

A belt pulley is arranged on the shaft of the crushing motor 2; the belt pulley is connected with the belt pulley at the end of the rotating blade through a V-belt 8; the crushing blades are composed of two triangular steel blocks, wherein one triangular steel block is arranged on the rotating shaft (serving as a rotating blade 70), and the other triangular steel block is arranged on the rack (serving as a fixed blade 71);

the surfaces of the two crushing blades are provided with convex teeth, so that the drainage and crushing effects are achieved, the sharp convex teeth can have larger destructive power under the action of the same force, the rotating blades 70 and the fixed blades 71 are in relative displacement, the rotating blades 70 are connected with one end of a rotating shaft, and the other end of the rotating shaft is connected with a belt pulley.

The rotating shaft drives the rotating blades to move, so that an ideal crushing effect is achieved.

As shown in fig. 4 and 5, the screening device consists of a screen 42, a vibrating motor 39, a damping spring 38, a vibration adsorption block 37 and a refining device 13, wherein a screen protective edge 41 is arranged on the periphery of the screen 9, and a notch is reserved at the lower part of the protective edge 41 and used for enabling stones with particle sizes larger than the aperture diameter to flow to a discharge pipe from the screen, and the stones are collected for fine grinding again; the stone material with the aperture smaller than the aperture enters the temporary storage, the temporary storage is surrounded by two baffles to form an inverted triangle, and the outlet at the lower part of the temporary storage is a slit, so that the flow limiting effect is realized, and the efficiency is prevented from being influenced by overlarge flow.

A damping spring 38 is arranged between the vibration adsorption block 37 and the screen 9, and the vibration adsorption block is provided with a vibration motor through a bearing; the screen mesh is connected with the vibration device through a spring, and the vibration motor 39 is fixed on a flat plate connected with the spring; a temporary storage warehouse consisting of two baffles 10 is arranged below the screen 42; the right lower edge of a discharge port of the temporary storage is provided with an air blower 11, and the air blower 11 is fixed on a bracket 47 welded with the shell; the air blower 11 sets up the collecting plate to the face, sets up the storage case below the collecting plate, and the collecting plate welds with the shell.

The wind speed of the blower 11 is adjusted to make the small stone powder blown to the collecting plate opposite to the blower, the collecting plate is welded with the shell, and the lower storage box can collect the blown stone powder. The larger particles can fall on a conveyor belt at the lower part to carry out the next step of more refined powder removal.

A conveyor belt 14 of the thinning device is arranged below the material storage box; the thinning device is fixed on a bracket welded with the shell.

As shown in fig. 4, the refining device 13 comprises a cam 32, a rotating wheel 34, a conveyor belt 14, an electrostatic transmitter, and a storage tank 19, wherein the storage tank 19 is provided with a viewing port 33, the cam 32 is connected with the rotating wheel 34 through the conveyor belt 14, the upper left part of the storage tank 19 is provided with the rotating wheel 34, the lower part of the storage tank 19 is provided with the rotating wheel 34, the right part of the storage tank is provided with the cam 32, the two rotating wheels 34 and the cam 32 are connected through the conveyor belt 14, and the electrostatic generator is arranged near the two rotating wheels at the upper part.

The diameter of the cam 32 is greater than the diameter of the runner 34.

As shown in fig. 9, the electrostatic transmitter is composed of an electrostatic generating rod 60 and a box 62, the box 62 is provided with an adjusting knob 63 and a display panel 64, and the electrostatic generating rod 60 is connected with the adjusting knob 63 and the display panel 64 through a wire 61;

static adsorbs the slight mountain flour of falling on the conveyer belt, and the lower part runner is far away from electrostatic generator electric charge volume not enough, and the mountain flour has received to do all can less here and drops to insulating storage box, and the runner rotates and makes the conveyer belt vibration to this makes the mechanism sand that meets the requirements standard drop to the conveyer belt on, and there is the baffle conveyer belt right part, and those mechanism sands that meet the requirements fall into the conveyer belt of lower part, and send it into on the conveying steel band 15. The conveying steel belt 15 is composed of a plurality of sections of rectangular angle steel, the sections are hinged to enable the conveying steel belt to rotate more conveniently, and the upper end of the conveying steel belt 15 is directly inserted into the rotary drum.

As shown in fig. 3, the sand washing device comprises an upper motor 18, a lower motor 23 and a rotary drum 17, wherein the upper motor 18 is connected with a spiral rotary shaft 29, a blunt knife 28 is installed on the spiral rotary shaft 29, a cross 21 is welded on a shaft of the lower motor 23, the rotary drum 17 is welded on the cross 21, a rotary drum framework 26 is arranged on the inner wall of the rotary drum 17, the rotary drum framework 20 is made of steel pipes, the rotary drum framework 20 is provided with a water spraying hole, and the rotary drum framework 20 is not only used for reinforcing the rotary drum 17 and preventing the rotary drum 17 from deforming greatly during rotation, but also has a water. The rotating drum framework 20 is formed by vertically and horizontally welding four metal tubes and is fixed with the rotating drum 17, and the rotating drum 17 and the rotating drum framework 20 are connected into a firm whole.

The wall of the rotating drum is made of high-strength steel, drain holes are uniformly distributed at the lower part of the wall of the rotating drum and below two thirds of the height of the wall of the rotating drum, a water retaining sleeve 26 is arranged outside the wall of the rotating drum, and the water retaining sleeve 26 can move up and down along the wall of the rotating drum. The water inlet at the same height as the rotary drum is provided with four water flow valves which are electrically controlled.

The lower motor 23 is fixedly arranged on a motor bracket 27, and the motor bracket 27 is a quadrilateral frame; the motor bracket 27 is welded with the sand-binding storehouse 25; the bottom of the sand-bundling storehouse 25 is provided with a discharge opening 16,

a water inlet pipe is arranged above the rotary drum 17; four discharge doors 22 are arranged at the lower part of the rotary drum at equal intervals and used for discharging washed sand, the discharge doors are opened when the water retaining sleeve rises, when the water retaining sleeve falls, the four discharge doors 22 are just tied, and the water retaining sleeve is connected with the hydraulic cylinder and controls the up-and-down movement of the water retaining sleeve through the stretching of the hydraulic cylinder.

The bottom of the water retaining sleeve is provided with a rubber ring for sealing when the water retaining sleeve falls to a specified position, the water loss at the initial stage of water adding of the rotary drum is prevented, and the rubber ring and the groove are cleaned by high-pressure water flow after the work is finished every time.

The outlet of the discharge opening 16 is provided with a blade. And a drainage groove 24 is formed below the discharge opening 16, and the drainage groove 24 is connected with a drainage groove 36.

The water filtering layer 44 is arranged in the water filtering tank 36 shown in fig. 6, the water outlet 43 is arranged at the lower part of the water filtering tank, the roughly filtered water can be collected for secondary use, the loss of water resources is greatly reduced, and the water filtering tank is tightly welded at the lower part of a special steel belt and is connected with the shell into a whole.

As shown in fig. 8, the water flow valve comprises a rotating shaft bracket 53, a blade 54, a line inlet pipe 56, a control motor 57, a motor shaft 58 and a motor limiting column 59, wherein the motor shaft 58 is connected with the blade 54, and the blade 54 is driven by the control motor 57 to deflect to determine the size of water flow in the pipe.

The working principle of the invention is as follows: as shown in figure 1, the stone is poured into the crushing device 3, the motor 2 starts to operate, the crushing device 3 starts to operate, the crushing grain size of the machine can be set, the crushed stone enters the screen 9 with the vibrating motor 39, the vibrating motor 39 vibrates to assist the falling of the stone, the stone with the grain size smaller than that of the screen directly falls onto the baffle 10 of the temporary storage bin, and if the stone with the grain size larger than that of the screen, the stone flows out of the lower part of the screen into the discharging pipe 4 and is collected for secondary crushing. The stone falling into the baffle 10 flows out from the lowest slit, the air speed of the blower 11 is controlled to blow the fine stone powder in the crushed stone to the opposite stone powder collecting plate 51, the stone powder collecting plate 51 is provided with a storage box 19 capable of collecting the stone powder, the side surface of the storage box 19 is provided with an observation port 33 which can judge whether the stone powder needs to be cleaned in real time, the stone powder which is not blown, namely the machine-made sand falls onto the lowest conveyor belt 14 and is conveyed to the refining treatment device 13, the machine-made sand falls onto the conveyor belt 14, because the static generator 60 is arranged, the tiny stone powder can be adsorbed on the conveyor belt 14, the stone powder at the farthest position of the lower part of the conveyor belt 14 is difficult to be adsorbed due to insufficient electric charge amount, the stone powder can fall into the storage box 19, the stone powder with slightly large particle size can flow onto the conveyor belt 14 and is conveyed to the conveyor belt 15, the machine-made sand falls into, at the same time, water begins to be added, the water retaining sleeve 26 outside the rotary drum falls to the lowest part, machine-made sand and water enter the rotary drum 17 at the same time, the motor 18 starts to rotate, the sand amount is one third of the rotary drum 17, and the water level is added to two thirds of the position. The water pipe is inserted into the water inlet 1, water flows into the position right above the rotary drum 17 along the steel pipe, water is added under normal water pressure, and the interior of the rotary drum is cleaned by pressurized water flow. After the machine-made sand is cleaned, the water retaining sleeve 26 is lifted to half of the height of the discharge port 22 for allowing dirty water to flow out of the vertical rotary drum framework 20, the blade in the lower discharge port 16 is opened by rotating 90 degrees, meanwhile, the drainage groove 40 in the lower portion is lifted up to bring water flow into the water filtering groove 36, and the bottom of the water filtering groove 36 is provided with a water outlet. After all the water flows out, the sand conveying plate 52 on the lower portion of the discharge port 16 rises, the drainage groove 40 falls, the water retaining sleeve 26 rises again, the discharge door 22 completely loses the restraint of the water retaining sleeve 26 and is jacked open by the sand in the rotary drum 17, at the moment, the lower motor starts to work to drive the rotary drum 17 to rotate, all the sand in the rotary drum is thrown out, and the sand flows to the outside from the discharge port 16 through the sand conveying plate 52 to be naturally dried. For cleaning after the cleaning part is used, pressurized water flow is injected from the water inlet 1, the blades 54 at the same height as the rotary drum 17 are opened, the water flow is sprayed out from four vertical support pipes at the top of the rotary drum (the four vertical support pipes are connected with water pipes), water outlet holes are chiseled on the inner sides of the four support pipes, the water pipes are connected in the later cleaning process, the high-pressure water flow is used for cleaning the outside of the barrel, at the moment, the rotary drum rotates, and the water retaining sleeve 26 moves up and down to clean the outside of the rotary drum. The cleaned water is collected into the water filtering groove 36 through the drainage groove 24 for secondary utilization of resources. The cleaning of the interior is carried out directly from the top by a pressurized water flow, while the rotating drum is stationary.

The invention is not limited to the preparation of machine-made sand, and can also be used for cleaning other materials.

Claims

1. A sand making method is characterized in that stones are poured into a crushing device (3) of a sand making machine, a motor (2) starts to operate, the crushing device (3) starts to work, the crushing grain size of the machine is set, the crushed stones enter a screen (9) with a vibration motor, the vibration motor (39) vibrates to assist the stones to fall down, the stones with the grain sizes smaller than that of the screen directly fall onto a temporary storage baffle (10), the stones with the grain sizes larger than that of the screen flow out of a launder at the lower part of the screen into a discharge pipe (4), and the stones are collected to be crushed again; the stone falling into the baffle plate (10) flows out from the lowest slit, and the blower motor (11) blows the fine stone powder in the crushed stone to the opposite stone powder collecting plate (51) and the storage box (19); the machine-made sand which is not blown falls onto a lowest conveyor belt (14) and is conveyed into a refining device (13), the machine-made sand falls onto the conveyor belt (14), tiny stone dust is adsorbed onto the conveyor belt (14), stone dust is difficult to adsorb due to the fact that the electric charge quantity is insufficient at the farthest position of the lower portion of the conveyor belt (14), the machine-made sand falls into a storage box (19), the stone dust with a slightly larger particle size flows onto the conveyor belt (14), the stone dust is conveyed onto an inclined conveyor steel belt (15), the machine-made sand falls into a rotary drum (21) from the top end of the conveyor steel belt (15), water is added at the same time, a water retaining sleeve (26) outside the rotary drum falls onto the lowest portion, the machine-made sand and the water simultaneously enter the rotary drum (21), the motor (18) starts to rotate, the sand quantity is one third of the rotary drum (21), and the water level; inserting a water pipe into the water inlet (1), leading water flow to flow into the position right above the rotary drum (21) along the steel pipe, adding water under normal water pressure, and pressurizing the water flow to clean the interior of the rotary drum; after the machine-made sand is cleaned, the water retaining sleeve (26) is lifted to half of the height of the discharge port (22) for allowing dirty water to flow out of the vertical rotary drum framework (20), the blade in the lower discharge port (16) is rotated by 90 degrees and opened, meanwhile, the drainage groove (40) in the lower part is lifted, water flow is brought into the water filtering groove (36), and the bottom of the water filtering groove (36) is provided with a water outlet; after all the water flows out, a sand conveying plate (52) at the lower part of the discharge port (16) rises, the drainage groove (40) falls down, the water retaining sleeve (26) rises again, the discharge door (22) loses the constraint of the water retaining sleeve (26) completely and is pushed open by sand in the rotary drum (21), at the moment, a lower motor starts to work to drive the rotary drum (21) to rotate, all the sand in the rotary drum is thrown out, and the sand flows to the outside of the machine from the discharge port (16) through the sand conveying plate (52) to be naturally dried; for the cleaning after the cleaning part is used, pressurized water flow is injected from a water inlet (1), blades (54) at the same height as the rotary drum (21) are opened, the water flow is sprayed out from small holes of a bracket pipe above the rotary drum, the rotary drum (21) rotates, a water blocking sleeve (26) moves up and down to clean the whole body, and the cleaned water is collected into a water filtering groove (36) through a drainage groove (24) for secondary utilization of resources; the sand making machine comprises a crushing device, a screening device and a sand washing device, wherein the screening device is arranged below the crushing device; the crushing device consists of a motor, a transmission belt and crushing blades, wherein the motor is connected with the crushing blades through the transmission belt; the crushing blades consist of rotating blades and fixed blades, the rotating blades are connected with a motor through a transmission belt, and the fixed blades are fixedly arranged on a bracket of the crushing device;

the screening device consists of a screen, a vibration motor, a damping spring, a vibration adsorption block and a refining device, wherein the periphery of the screen is provided with a screen protective edge, the damping spring is arranged between the vibration adsorption block and the screen, and the vibration adsorption block is provided with the vibration motor through a bearing; the vibration motor is fixed on the flat plate connected with the damping spring; a temporary storage warehouse is arranged below the screen, an air blower is arranged below the temporary storage warehouse, a collecting plate is arranged opposite to the air blower, and a storage box is arranged below the collecting plate;

the refining device consists of a gap rotating wheel, rotating wheels, a conveying belt, an electrostatic transmitter and a storage box, wherein the gap rotating wheel is connected with the rotating wheels through a belt, and the electrostatic transmitter is arranged near the two rotating wheels;

the sand washing device comprises a water inlet pipe, an upper motor, a lower motor and a rotary drum, wherein the upper motor is connected with a rotary shaft, and the rotary shaft is provided with a blunt knife; the lower motor shaft is welded with the cross, the cross is welded with the rotary drum, and the rotary drum is provided with a sand outlet and a water drain hole; the drain hole is arranged at the lower part of the rotary drum and is positioned below two thirds of the height of the rotary drum; the periphery of the wall of the rotary drum is provided with a water retaining sleeve, the water retaining sleeve is driven by the hydraulic cylinder to move up and down along the wall of the rotary drum, and the height of the water retaining sleeve is two thirds of that of the rotary drum.