CN115625027A

CN115625027A - Circulating quartz sand dust removal screening plant

Info

Publication number: CN115625027A
Application number: CN202211188096.XA
Authority: CN
Inventors: 闫颖红
Original assignee: Chongqing Longguan Machinery Manufacturing Co ltd
Current assignee: Chongqing Longguan Machinery Manufacturing Co ltd
Priority date: 2022-09-28
Filing date: 2022-09-28
Publication date: 2023-01-20

Abstract

The invention belongs to the field of quartz sand processing, and particularly relates to a circulating quartz sand dust removal screening device which comprises a screening box, a crushing box, a feed hopper, an end cover, a screening mechanism, a circulating mechanism, a sealing frame, a screening net cage and a material guide plate, wherein the screening box is fixedly connected with the crushing box, the crushing box is fixedly connected with the feed hopper, and the screening box is connected with the end cover through threads. According to the invention, the connecting rod, the spring, the cam and other structures are additionally arranged in the screening box, so that when materials are screened, the screening net box can be repeatedly pushed to move through the rotation of the cam, and the spring is repeatedly compressed, so that the screening net box can vibrate, the screening efficiency can be improved, and the raw materials passing through the screening net box can be newly fed into the crushing box to be secondarily crushed through the rotation of the reamer, so that the raw materials can be more thoroughly screened.

Description

Circulating quartz sand dust removal screening plant

Technical Field

The invention belongs to the field of quartz sand processing, and particularly relates to a circulating quartz sand dedusting and screening device.

Background

Silica sand is a hard, wear-resistant, chemically stable silicate mineral and is therefore often used in glass manufacturing, ceramic manufacturing, metallurgical industry, electronics and aerospace, among others. In the process of processing the quartz sand, the quartz sand agglomerates need to be crushed, and dust in the quartz sand needs to be screened after crushing.

According to the technical scheme provided by the invention patent with the patent application publication number of CN 106862068A, the invention relates to a circulating type quartz sand dust removal screening device which comprises a vibration screening machine body, wherein a muddy water tank and a clean water tank are arranged below the vibration screening machine body, a first high-pressure water pump, a centrifuge and a second high-pressure water pump are arranged on a rack, the centrifuge comprises a centrifuge outer cylinder and a centrifuge inner cylinder, a centrifuge motor is arranged at the top of the centrifuge, the centrifuge motor is connected to the top end of the centrifuge inner cylinder through a rotating shaft and an opening on the centrifuge outer cylinder, a soil discharge channel is formed above the inside of the centrifuge inner cylinder, a filter hole and filter cloth are formed in the centrifuge inner cylinder, a lifting mechanism is further arranged in the centrifuge, the lifting mechanism is connected with a lifting rod, the lifting rod is connected with a scraper, a water outlet and a water outlet pipe are arranged at the bottom of the centrifuge, the water outlet pipe is connected to the clean water tank, and the water outlet of the second high-pressure water pump is connected to a first spray nozzle and a second spray nozzle.

The invention solves the problems that impurities such as mud enter the circulating system again to cause equipment blockage and the muddy water has poor dust removal effect. However, when the quartz sand dedusting and screening device is used, part of sand bodies may agglomerate and are not completely crushed, so that the sand bodies cannot pass through the filter plate, the filter plate is easy to block, and the screening efficiency of the quartz sand is influenced. Accordingly, there is a need for improvements in the art.

Disclosure of Invention

The invention aims to provide a circulating quartz sand dedusting and screening device, which solves the problems that the existing sand body is poor in crushing effect and a screening net cage is easy to block.

In order to achieve the purpose, the invention provides a circulating quartz sand dust removal screening device which comprises a screening box, a crushing box, a feeding hopper, an end cover, a screening mechanism, a circulating mechanism, a sealing frame, a screening net box and a material guide plate, wherein the screening box is fixedly connected with the crushing box, the feeding hopper is fixedly connected with the crushing box, the screening box is connected with the end cover through threads, the screening mechanism is arranged inside the screening box, the circulating mechanism is arranged outside the screening box, the sealing frame is connected inside the screening box in a sliding mode, the screening net box is fixedly connected inside the sealing frame, and the material guide plate is fixedly connected with the screening net box.

The principle of the invention is as follows: when the quartz sand is screened, the raw material quartz sand is placed into the feeding hopper, the quartz sand falls on the screening net cage after being crushed in the crushing box, then the speed reducing motor drives the rotating rod to rotate, the rotating rod drives the cam to rotate in the rotating process, the cam repeatedly contacts with the circular arc block in the rotating process, the screening net cage is pushed to move downwards, the spring is extruded, the screening net cage can vibrate after being extruded, the vibration of the raw material inside can be realized, the crushed raw material is screened, the raw material which cannot pass through the screening net cage falls into the material box through the guide plate, then the servo motor is started, the servo motor drives the reamer outside the driving rod to rotate, the reamer can lift the material in the rotating process, the material is discharged into the feeding hopper along the circulating pipe and the connecting pipe to be secondarily crushed, and the material can be screened more thoroughly.

The invention has the beneficial effects that: according to the invention, the connecting rod, the spring, the cam and other structures are additionally arranged in the screening box, so that when materials are screened, the screening net box can be repeatedly pushed to move through the rotation of the cam, and the spring is repeatedly compressed, so that the screening net box can vibrate, the screening efficiency can be improved, and the raw materials passing through the screening net box can be newly fed into the crushing box to be secondarily crushed through the rotation of the reamer, so that the raw materials can be more thoroughly screened.

Further, screening mechanism includes connecting plate, connecting rod, spring, circular arc piece, dwang, cam, gear motor, the connecting plate of two symmetric distributions of inside fixedly connected with of screening case, the inside sliding connection of connecting plate has the connecting rod, the outside of connecting rod is provided with the spring, the circular arc piece of two symmetric distributions of fixedly connected with on the screening net case, install the dwang through the bearing on the screening case, fixedly connected with cam on the dwang, the outside fixed mounting of screening case has gear motor, and the dwang can drive the cam and rotate.

Further, gear motor's output with dwang fixed connection, the cam with the contact of circular arc piece, the connecting rod with screening box with a net fixed connection, the cam can promote the circular arc piece repeatedly through rotating.

Furthermore, one end of the spring is fixedly connected with the connecting plate, the other end of the spring is fixedly connected with the screening net box, and the spring can drive the screening net box to vibrate through elasticity.

Further, circulation mechanism includes material case, circulating pipe, actuating lever, reamer, servo motor, connecting pipe, the outside fixedly connected with material case of screening case, fixedly connected with circulating pipe on the material case, the actuating lever is installed through the bearing in the inside of circulating pipe, the outside fixedly connected with reamer of actuating lever, fixed mounting has servo motor on the circulating pipe, and the material case can carry out brief accepting to the material.

Further, fixedly connected with connecting pipe on the circulating pipe, the connecting pipe with feeder hopper fixed connection, the connecting pipe can carry out the feed to the feeder hopper.

Further, the reamer is in contact with the circulating pipe, an output shaft of the servo motor is connected with the driving rod through a bolt, and the reamer can lift materials through rotation.

Further, still be fixed with magnet on the crushing case lateral wall, still be equipped with controller, filter, coil on the screening box with a net and be used for attracting the fixed plate that has magnetic force quartz sand, the filter is fixed in the bottom of screening box with a net, it has a plurality of rows of filtration pores to open on the filter, the inside of filter is opened at one side of every adjacent filtration pore has the cavity, the inner structure of cavity is cuboid shape cavity, every cavity and the intercommunication of corresponding filtration pore, be fixed with the guide rail in the cavity, the track of guide rail towards the filtration pore, still be equipped with dog and pneumatic cylinder on the guide rail, the dog with guide rail sliding connection, the pneumatic cylinder is fixed on the guide rail, be equipped with the hydraulic stem on the pneumatic cylinder, the hydraulic stem with dog fixed connection, the fixed plate is fixed in the both sides of screening, the coil sets up in by the filtration pore, the controller is used for judging whether the electric current through the coil changes, when the controller judges that the electric current that the coil passes through changes, then the hydraulic stem of controller control pneumatic cylinder promotes the dog slides to filter pore direction, when the controller judges that the coil keeps stable, then the hydraulic stem of return control hydraulic cylinder slides to second fixed plate and pull the second guide plate and second guide plate, the second guide plate and second guide plate that the second guide plate is connected to the second guide plate.

The silica sand is used for manufacturing glass, high-purity silicon metal, silicide, and the like in daily life, and thus the purity of the silica sand used for manufacturing the above products must reach a high level. However, after the existing quartz sand is crushed, only the physical form size of the quartz sand is changed, and the obtained crushed quartz sand still contains some impurities, such as: contains mechanical iron, hematite, and impurities such as aluminum and titanium. Magnet setting in this scheme is at the lateral wall of smashing the case, and when the quartz sand after smashing drops along the lateral wall, thereby can carry out mechanical friction with the quartz sand that contains impurity such as mechanical iron or hematite and make these quartz sand magnetism incidentally.

When the crushed fine quartz sand enters the screening net cage after being opened, the magnetic field is generated by electrifying the coil on the screening net cage, so that when the quartz sand with magnetism moves in the magnetic field, the current of the coil is generated by cutting the magnetic induction wire. The controller can easily judge the specific position of the quartz sand containing impurities on the screening net cage by judging the current change of the coil on the screening net cage. When the controller identifies the position of the impurity quartz sand, the hydraulic cylinder at the position is controlled, so that the hydraulic rod of the hydraulic cylinder pushes the stop block positioned on the slide rail to slide towards the direction of the filter holes (because the inside of the filter plate is provided with a cavity at one side of each adjacent filter hole, and a guide rail is fixed in the cavity). The dog can shelter from the partial space of filtering the hole at the in-process that removes to the size of filtering the hole is crossed in dynamic adjustment, lets impurity quartz sand unable through filtering the hole. When the controller judges that the current passed through by the coil is kept stable, the controller controls the hydraulic rod pull-back check block of the hydraulic cylinder to slide to the original position, so that the size of the filter hole is restored to the original state, and the screening of the quartz sand is continued.

When the quartz sand containing impurities cannot enter the end cover through the filtering holes, the impurity quartz sand is attracted by the fixing plates on the two sides of the screening net cage (the fixing plates are provided with magnetic force) and slides along the side walls from the screening net cage into the first material guide plate due to the magnetism of the impurity quartz sand, and the quartz sand without the impurities enters the second material guide plate, so that the impurity quartz sand and the high-purity quartz sand are screened finally.

Although the magnet arranged on the crushing box in the scheme also has magnetic force, the magnet does not fall into the screening net box from the crushing box and carries out magnetic induction line cutting with the magnetic field of the coil, so that the current of the coil is changed, and the current passing through the coil cannot be interfered. Meanwhile, although the magnets also generate part of weak magnetic fields, the magnetic field directions of the magnets and the magnetic fields of the coils are on different horizontal lines, and the magnetic field interference of the positions of the coils cannot be caused. Therefore, the current change of the coil recognized by the controller can be ensured, and is certainly the current change caused by the impurity quartz sand.

In conclusion, the controller, the filter plate, the coil and the fixing plate for attracting the quartz sand with magnetic force are arranged on the screening net cage, so that the quartz sand screening efficiency can be improved, meanwhile, the quartz sand containing impurities such as hematite, mechanical iron and the like in the quartz sand is screened out and guided into the first material guide plate, the impurity quartz sand is removed, and the screened raw material quartz sand is the quartz sand with higher purity (namely, the main mineral component is SiO 2).

Drawings

FIG. 1 is a schematic view of a circulating quartz sand dust removal screening device according to an embodiment of the invention;

FIG. 2 is an enlarged view of the structure A of FIG. 1 of the circulating quartz sand dust-removing and screening device according to the embodiment of the present invention;

FIG. 3 is an enlarged view of the structure B of FIG. 1 of the circulating quartz sand dust-removing screening device according to the embodiment of the present invention;

FIG. 4 is a cross-sectional view of a filter plate in the circulating quartz sand dust removal screening apparatus of an embodiment of the present invention;

FIG. 5 is a top view of a material guide plate of the circulating quartz sand dust removing and screening apparatus according to the embodiment of the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: screening case 1, crushing case 2, feeder hopper 3, end cover 4, screening mechanism 5, circulating mechanism 6, sealing frame 7, screening box with a net 8, stock guide 9, electro-magnet 10, connecting plate 51, connecting rod 52, spring 53, circular arc piece 54, dwang 55, cam 56, gear motor 57, material case 61, circulating pipe 62, actuating lever 63, reamer 64, servo motor 65, connecting pipe 66, filter 81, filter hole 811, first stock guide 91, second stock guide 92, dog 10, guide rail 11, pneumatic cylinder 12, hydraulic stem 121.

As shown in fig. 1, the embodiment provides a circulating quartz sand dust removal screening plant, including screening case 1, crushing case 2, feeder hopper 3, end cover 4, screening mechanism 5, circulation mechanism 6, sealing frame 7, screening box 8, stock guide 9, fixedly connected with crushing case 2 on the screening case 1, fixedly connected with feeder hopper 3 on the crushing case 2, there is end cover 4 through threaded connection on the screening case 1, the inside of screening case 1 is provided with screening mechanism 5, the outside of screening case 1 is provided with circulation mechanism 6, the inside sliding connection of screening case 1 has sealing frame 7, the inside fixedly connected with screening box 8 of sealing frame 7, fixedly connected with stock guide 9 on the screening box 8.

As shown in fig. 1 and 2, the screening mechanism 5 includes a connecting plate 51, a connecting rod 52, a spring 53, an arc block 54, a rotating rod 55, a cam 56, a speed reduction motor 57, two symmetrically distributed connecting plates 51 are fixedly connected to the inside of the screening box 1, the connecting rod 52 is slidably connected to the inside of the connecting plate 51, the spring 53 is disposed on the outer side of the connecting rod 52, two symmetrically distributed arc blocks 54 are fixedly connected to the screening box 8, the rotating rod 55 is mounted on the screening box 1 through a bearing, the cam 56 is fixedly connected to the rotating rod 55, the speed reduction motor 57 is fixedly mounted on the outer side of the screening box 1, the rotating rod 55 can drive the cam 56 to rotate, the output end of the speed reduction motor 57 is fixedly connected to the rotating rod 55, the cam 56 contacts with the arc block 54, the connecting rod 52 is fixedly connected to the screening box 8, the cam 56 can repeatedly push the arc block 54 through rotation, one end of the spring 53 is fixedly connected to the connecting plate 51, the other end of the spring 53 is fixedly connected to the screening box 8, and the spring 53 can drive the screening box 8 to vibrate through elasticity.

As shown in fig. 1 and 3, the circulating mechanism 6 includes a material tank 61, a circulating pipe 62, a driving rod 63, a reamer 64, a servo motor 65, a connecting pipe 66, the material tank 61 is fixedly connected to the outer side of the screening tank 1, the circulating pipe 62 is fixedly connected to the material tank 61, the driving rod 63 is installed inside the circulating pipe 62 through a bearing, the reamer 64 is fixedly connected to the outer side of the driving rod 63, the servo motor 65 is fixedly installed on the circulating pipe 62, the material tank 61 can temporarily receive the material, the connecting pipe 66 is fixedly connected to the circulating pipe 62, the connecting pipe 66 is fixedly connected to the feeding hopper 3, the feeding hopper 3 can be fed through the connecting pipe 66, the reamer 64 contacts with the circulating pipe 62, the output shaft of the servo motor 65 is connected to the driving rod 63 through a bolt, and the reamer 64 can lift the material through rotation.

The specific implementation process of the invention is as follows: when the quartz sand is screened, the raw material quartz sand is placed into the feed hopper 3, the quartz sand falls on the screening net cage 8 after being crushed inside the crushing box 2, then the speed reduction motor 57 drives the rotating rod 55 to rotate, the rotating rod 55 drives the cam 56 to rotate in the rotating process, the cam 56 repeatedly contacts with the arc block 54 in the rotating process and pushes the screening net cage 8 to move downwards, the spring 53 is extruded, the spring 53 can vibrate the screening net cage 8 after being extruded, so that the internal raw material can vibrate, the crushed raw material is screened, the raw material which cannot pass through the screening net cage 8 falls into the material box 61 through the guide plate 9, then the servo motor 65 is started, the servo motor 65 drives the reamer 64 outside the driving rod 63 to rotate, the reamer 64 can lift the material in the rotating process, the material is secondarily crushed along the circulating pipe 62 and the connecting pipe 66 to the inside of the feed hopper 3, and the material can be screened more thoroughly.

According to the invention, the connecting rod 52, the spring 53, the cam 56 and other structures are additionally arranged in the screening box 1, when materials are screened, the screening net box 8 can be repeatedly pushed to move through the rotation of the cam 56, and the spring 53 is repeatedly compressed, so that the screening net box 8 can vibrate, the screening efficiency can be improved, and the raw materials passing through the screening net box 8 can be newly sent into the crushing box 2 for secondary crushing through the rotation of the reamer 64, so that the raw materials can be screened more thoroughly.

Example 2

The present embodiment is different from the first embodiment in that, as shown in fig. 4 and 5, magnets are further fixed to the side wall of the crushing box 2, and the magnets can be attached with magnetism by rubbing against the sand containing iron ore impurities. The screening net cage 8 is also provided with a controller, a coil and a fixing plate for attracting the quartz sand with magnetic force. The controller chooses the singlechip for use to control, and the bottom of screening net case 8 is fixed with filter 81, and it has a plurality of rows of filtration hole 811 to open on the filter 81, and the inside of filter 81 is opened in one side of every adjacent filtration hole 811 has the cavity, and the inner structure of cavity is the cavity of cuboid shape, and every cavity communicates each other with the filtration hole 811 that corresponds, and the cavity is inside still to be fixed with guide rail 11, and guide rail 11's track orientation filters hole 811. The guide rail 11 is further provided with a stop block 10 and a hydraulic cylinder 12, the stop block 10 is in sliding connection with the guide rail 11, the hydraulic cylinder 12 is fixed on the guide rail 11, the hydraulic cylinder 12 is provided with a hydraulic rod 121, and the hydraulic rod 121 is fixedly connected with the stop block 10. The stopper 10 is used for sliding on the guide rail 11 toward the filter hole 811 under the pushing of the hydraulic rod 121 of the hydraulic cylinder 12 until a part of the hollow space of the filter hole 811 is shielded, thereby changing the size of the filter hole 811.

The coil sets up by filtering hole 811, and the coil also is equipped with a plurality ofly. When the dedusting and screening device works, the coil is electrified, the controller on the screening net cage 8 starts to judge whether the current passing through the coil changes, and when the controller judges that the current passing through the coil changes, the hydraulic rod 121 of the controller control hydraulic cylinder 12 pushes the stop block 10 to slide towards the direction of the filtering hole 811, so that the size of the filtering hole 811 is changed, sand containing impurities is prevented from rolling off from the filtering hole 811, and the screening of the impurity quartz sand and the high-purity quartz sand is realized. When the controller judges that the current passing through the coil is stable, the controller controls the hydraulic rod 121 of the hydraulic cylinder 12 to pull back the stopper 10 to slide to the original position, so that the size of the filter hole 811 is restored to the original state, and the screening of the quartz sand is continued.

The fixed plates are fixed on two sides of the screening net cage 8, the material guide plate 9 comprises a first material guide plate 91 and a second material guide plate 92, the first material guide plate 91 is welded with the second material guide plate 92, and the first material guide plate 91 is arranged on two sides of one end of the screening net cage 8. Because the fixed plate has magnetic force, the fixed plate can attract sand containing impurities to approach, and gradually slide down to enter the first material guide plate 91 (the discharge port end of the screening net cage 8 is obliquely arranged downwards as shown in the attached drawing 1), and sand without impurities enters the second material guide plate 92 for subsequent secondary crushing and screening.

The specific implementation process is as follows: when the quartz sand is screened, the raw material quartz sand is placed into the feed hopper 3, after the quartz sand is crushed in the crushing box 2, the quartz sand drops into the screening net cage 8 from the crushing box 2, and the raw material quartz sand containing impurities such as iron ore and the like can rub with the magnet on the side wall of the crushing box 2, so that the magnetic property is brought. When the raw material quartz sand falls into the screening net cage 8, the magnetic raw material quartz sand and the coil in the screening net cage 8 generate an electromagnetic induction effect (namely, the coil has a magnetic field after being electrified, and the magnetic impurity raw material quartz sand cuts a magnetic induction line when falling into the screening net cage 8), so that the current passing through the coil changes. At this time, after the controller recognizes the current change of the coil, the hydraulic rod 121 of the hydraulic cylinder 12 is controlled to push the stopper 10 to slide towards the direction of the filter hole 811, so that the size of the filter hole 811 is changed, sand containing impurities is prevented from rolling off from the filter hole 811, and the screening of the impurity quartz sand and the high-purity quartz sand is realized. The raw material quartz sand containing impurities is not introduced into the inlet end cover 4 from the filtering holes 811, and is attracted by the fixing plate on the screening net cage 8 and gradually falls into the first material guide plate 91, so that the raw material quartz sand containing impurities is removed, and secondary screening of the raw material quartz sand is avoided. When the controller judges that the current passing through the coil is stable, the controller controls the hydraulic rod 121 of the hydraulic cylinder 12 to pull back the stopper 10 to slide to the original position, so that the size of the filter hole 811 is restored to the original state, and the quartz sand screening of the original program is continued.

The above are only examples of the present invention, and the present invention is not limited to the field related to the embodiments, the general knowledge of the specific structures and characteristics of the embodiments is not described herein, and those skilled in the art can know all the common technical knowledge in the technical field before the application date or the priority date, can know all the prior art in the field, and have the capability of applying the conventional experimental means before the application date, and those skilled in the art can combine the capabilities of themselves to complete and implement the present invention, and some typical known structures or known methods should not become obstacles for those skilled in the art to implement the present application. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be defined by the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. The utility model provides a circulating quartz sand dust removal screening plant, includes screening case, crushing case, feeder hopper, end cover, screening mechanism, circulation mechanism, sealed frame, screening box with a net, stock guide, its characterized in that: the screening box is fixedly connected with a crushing box, the crushing box is fixedly connected with a feeding hopper, the screening box is connected with an end cover through threads, a screening mechanism is arranged inside the screening box, a circulating mechanism is arranged outside the screening box, a sealing frame is slidably connected inside the screening box, a screening net box is fixedly connected inside the sealing frame, and a material guide plate is fixedly connected to the screening net box.

2. The circulating quartz sand dedusting and screening device of claim 1, characterized in that: screening mechanism includes connecting plate, connecting rod, spring, circular arc piece, dwang, cam, gear motor, the connecting plate of two symmetric distributions of inside fixedly connected with of screening case, the inside sliding connection of connecting plate has the connecting rod, the outside of connecting rod is provided with the spring, the circular arc piece of two symmetric distributions of fixedly connected with on the screening net cage, install the dwang through the bearing on the screening case, fixedly connected with cam on the dwang, the outside fixed mounting of screening case has gear motor.

3. The circulating quartz sand dedusting and screening device of claim 2, characterized in that: the output of gear motor with dwang fixed connection, the cam with the circular arc piece contact, the connecting rod with screening box with a net fixed connection.

4. The circulating quartz sand dedusting and screening device of claim 2, characterized in that: one end of the spring is fixedly connected with the connecting plate, and the other end of the spring is fixedly connected with the screening net cage.

5. The circulating quartz sand dedusting and screening device of claim 1, characterized in that: the circulation mechanism includes material case, circulating pipe, actuating lever, reamer, servo motor, connecting pipe, the outside fixedly connected with material case of screening case, fixedly connected with circulating pipe on the material case, the actuating lever is installed through the bearing in the inside of circulating pipe, the outside fixedly connected with reamer of actuating lever, fixed mounting has servo motor on the circulating pipe.

6. The circulating quartz sand dedusting and screening device of claim 5, characterized in that: the circulating pipe is fixedly connected with a connecting pipe, and the connecting pipe is fixedly connected with the feeding hopper.

7. The circulating quartz sand dedusting and screening device of claim 5, characterized in that: the reamer is in contact with the circulating pipe, and an output shaft of the servo motor is connected with the driving rod through a bolt.

8. The circulating quartz sand dedusting and screening device of claim 1, characterized in that: the crushing box is characterized in that magnets are further fixed on the side wall of the crushing box, a controller, a filter plate, a coil and a fixing plate used for attracting magnetic quartz sand are further arranged on the screening net box, the filter plate is fixed at the bottom of the screening net box, a plurality of rows of filter holes are formed in the filter plate, a cavity is formed in one side of each adjacent filter hole in the filter plate, the internal structure of each cavity is a cavity in a cuboid shape, each cavity is communicated with the corresponding filter hole, a guide rail is fixed in each cavity, the track of the guide rail faces the filter holes, a stop block and a hydraulic cylinder are further arranged on the guide rail, the stop block is in sliding connection with the guide rail, the hydraulic cylinder is fixed on the guide rail, a hydraulic rod is arranged on the hydraulic cylinder and is fixedly connected with the stop block, the fixing plate is fixed on two sides of the screening net box, the coil is arranged beside the filter holes, the controller is used for judging whether the current passing through the coil changes, when the controller judges that the current passing through the coil changes, the controller controls the hydraulic rod of the hydraulic cylinder to push the stop block to slide towards the direction of the filter holes, when the controller judges that the current passing through the coil keeps stable, the second guide plate is connected with the second guide plate, and the second guide plate is connected with the second guide plate.