Round vibrating screen capable of preventing dust from flying

Abstract

The invention discloses a circular vibrating screen capable of preventing dust from flying, and relates to the technical field of circular vibrating screens, the circular vibrating screen comprises a vibrating screen body, a vibration excitation motor, a protective outer cover and two filter sieves, the protective outer cover sleeves the top end of the vibrating screen body, and the two filter sieves are obliquely arranged in the vibrating screen body; the shock excitation motor is arranged on one side of the vibrating screen body; dust can be prevented from overflowing from the interior of the vibrating screen when the vibrating screen works through the lifting dustproof plate, dust overflowing is further avoided through soft connection of a rubber pad, dust on the upper surface of the isolation plate can be conveniently discharged in time, air flow is used for blowing the dust on the surface of the isolation plate, and dust removal is facilitated. Under the condition that equipment vibration and airflow blowing are combined, dust on the surface of the isolation plate can be cleared away more easily, scraping strips can scrape the dust on the surface of the isolation plate, and the dust scraped by the scraping strips is more easily blown by an air spraying head.

Description

Technical Field

[0001] This invention relates to the field of circular vibrating screen technology, specifically to a circular vibrating screen that can prevent dust from flying. Background Technology

[0002] A circular vibrating screen is a screening device powered by a vibrating motor. The unbalanced weight of the vibrating motor generates vibration, causing the material to be separated on the screen. The vibrating motor drives the screen box to vibrate in an approximately circular trajectory. After the material enters the screen box, under the action of vibration, materials of different particle sizes are separated. Fine materials are discharged through the screen, while coarse materials remain on the screen. Circular vibrating screens have advantages such as high screening efficiency, easy screen replacement, wide applicability, and low noise. They are widely used in industries such as chemical, food, pharmaceutical, ceramics, and mining.

[0003] In existing technologies, circular vibrating screens generate dust when screening certain materials. This dust drifts to the outside of the screen, making the working environment dirty and messy. Even if some circular vibrating screens are equipped with protective covers, dust still overflows from the feed point after material is fed, further contributing to a dirty and messy working environment. For vibrating screens with protective covers, dust accumulates or adheres to the inside of the cover, preventing timely removal and making subsequent cleaning of the cover difficult. Summary of the Invention

[0004] The purpose of this invention is to provide a circular vibrating screen that can prevent dust from flying, so as to solve the problems mentioned in the background art.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A circular vibrating screen designed to prevent dust from flying includes a vibrating screen body, an excitation motor, a protective cover, and two filter screens. The protective cover is fitted over the top of the vibrating screen body. The two filter screens are inclinedly disposed inside the vibrating screen body. The excitation motor is disposed on one side of the vibrating screen body and is used to vibrate the filter screens. A dustproof structure is provided between the top of the vibrating screen body and one end of the protective cover. The dustproof structure includes two first guide grooves, which are respectively formed on both sides of the inner wall of the protective cover. A second guide groove is formed at the bottom of each of the two first guide grooves. The first and second guide grooves are connected. A dustproof plate is mounted between the two first guide grooves, and guide wheels are provided at the four corners of the dustproof plate. The four guide wheels are located inside the first and second guide grooves and are slidably connected to the inside of the first and second guide grooves. A rubber pad is installed at the bottom of the dustproof plate, and the dustproof plate and the rubber pad are in contact to prevent dust from overflowing from inside the vibrating screen body.

[0007] As a preferred technical solution of the present invention, the protective cover has reserved holes on both sides and at the intersection of the first guide groove and the second guide groove. The diameter of the reserved holes is larger than the diameter of the guide wheel. The reserved holes are used to install the guide wheel on both sides of the dustproof plate.

[0008] As a preferred embodiment of the present invention, the top of the protective cover is equipped with two pins, and the edge of the dustproof plate is provided with insertion holes. The two pins of the protective cover are aligned with the insertion holes of the dustproof plate, and the pins are used to restrict the dustproof plate from sliding downward.

[0009] As a preferred embodiment of the present invention, a dust removal structure is provided in the space between the top of the vibrating screen body and the inside of the protective cover. The dust removal structure includes an isolation plate arranged parallel to the protective cover. The isolation plate is disposed between the vibrating screen body and the protective cover and is welded to the inner wall of the protective cover. Several sets of first fixing strips are installed on the surface of the isolation plate. The first fixing strips are arranged obliquely on the surface of the isolation plate. A dust collection port is opened inside the first fixing strip and connects the upper surface and the lower surface of the isolation plate. A sealing strip is installed on the side wall of the first fixing strip. The obliquely arranged first fixing strips and the obliquely arranged isolation plate are used to accumulate dust at the corner of the isolation plate. A dust discharge port for discharging dust is provided at the corner of the protective cover.

[0010] As a preferred embodiment of the present invention, the surface of the isolation plate is provided with an inclined fixing groove, the first fixing strip is installed inside the fixing groove, and the sealing strip covers the upper outlet of the dust collection port. The sealing strip is used to prevent dust from flowing back to the bottom of the isolation plate.

[0011] As a preferred embodiment of the present invention, a fixed frame is provided at the corner of the surface of the isolation plate and on one side of the dust discharge port. Inside the fixed frame, from top to bottom, an airbag, a lifting plate, and several telescopic springs are arranged sequentially. The lifting plate is connected to the fixed frame through the telescopic springs. The top and bottom of the airbag are glued to the lifting plate and the protective cover. The telescopic springs expand or contract the airbag under the action of the excitation motor. A one-way air outlet connecting pipe is connected to one side of the airbag. The cylindrical surface of the connecting pipe is provided with a jet nozzle, which is used to blow away the dust on the surface of the isolation plate.

[0012] As a preferred embodiment of the present invention, one side of the airbag is connected to a one-way air inlet, and the end of the air inlet is located outside the protective cover. The number of the jet nozzles is adapted to the number of the first fixing strips.

[0013] As a preferred technical solution of the present invention, the end of the air inlet is provided with an end cap, and the end cap is used to control the airflow inside the airbag. When the lifting plate and the protective cover are close to each other, the airbag is compressed, or when the lifting plate and the protective cover are far apart, the airbag expands.

[0014] As a preferred embodiment of the present invention, a scraping structure is provided at the surface edge of the isolation plate. The scraping structure includes several sliding blocks. The sliding blocks are welded to one edge of the surface of the isolation plate. A second fixing strip is slidably connected inside the sliding block. A scraping strip is provided on one side of the second fixing strip and between each of the first fixing strips. A fixing end is welded to the top of the second fixing strip. A fixing block is welded to the surface of the dustproof plate at a position corresponding to the position of the connecting rod. A connecting rod is connected between the fixing end and the fixing block.

[0015] As a preferred embodiment of the present invention, both ends of the connecting rod are provided with connecting pins, and the two ends of the connecting rod are movably connected to the fixed end and the fixed block respectively through the connecting pins. The scraping strip is slidably connected to the surface of the isolation plate, and the connecting rod is used to push the second fixed strip and the scraping strip to move.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] It is equipped with a dustproof structure. The lifting dustproof plate can prevent dust from overflowing from the inside of the vibrating screen when it is working. The top of the vibrating screen can be sealed with a rubber pad, so that the rubber pad and the top of the vibrating screen are always in contact when the screen vibrates. The soft connection of the rubber pad further prevents dust from overflowing.

[0018] Equipped with a dust removal structure, the inclined isolation plate and the inclined first fixing strip can accumulate dust at a corner of the isolation plate when the equipment shakes, thus facilitating the timely discharge of dust on the upper surface of the isolation plate. The sealing strip can also prevent dust from flowing back from the dust collection port into the vibrating screen.

[0019] Equipped with an airbag, a lifting plate, and several telescopic springs, the vibration of the equipment can cause the telescopic springs to float, thereby compressing or expanding the internal volume of the airbag. The airflow blows away the dust on the surface of the isolation plate. The combination of equipment vibration and airflow makes it more effective to clean the dust on the surface of the isolation plate.

[0020] Equipped with a dust scraping structure, the fixed end and the second fixed strip move when the dustproof plate is closed or opened. The scraping strip can scrape the dust on the surface of the isolation plate, and the dust scraped by the scraping strip is more easily blown away by the air jet head. Attached Figure Description

[0021] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the main structure of a circular vibrating screen that can prevent dust from flying, according to the present invention.

[0023] Figure 2 This is a schematic diagram of a protective cover and filter screen for a circular vibrating screen that can prevent dust from flying, according to the present invention.

[0024] Figure 3 This is a schematic diagram of the dustproof structure of a circular vibrating screen that can prevent dust from flying, according to the present invention.

[0025] Figure 4 This is a schematic diagram of the dustproof plate and rubber pad of a circular vibrating screen that can prevent dust from flying, according to the present invention.

[0026] Figure 5 This is a schematic diagram of the dust removal structure of a circular vibrating screen that can prevent dust from flying, according to the present invention.

[0027] Figure 6 This is a schematic diagram of the connecting pipe and air jet head of a circular vibrating screen that can prevent dust from flying, according to the present invention.

[0028] Figure 7 This is a schematic diagram of the dust collection port and sealing strip of a circular vibrating screen that can prevent dust from flying, according to the present invention;

[0029] Figure 8 This is a schematic diagram of the airbag in a circular vibrating screen that can prevent dust from flying, according to the present invention.

[0030] Figure 9 This is a schematic diagram of the dust scraping structure of a circular vibrating screen that can prevent dust from flying, according to the present invention.

[0031] In the diagram: 1. Vibrating screen body; 2. Excitation motor; 3. Protective cover; 4. Filter screen; 5. Dustproof structure; 6. Dust removal structure; 7. Dust scraping structure; 51. First guide groove; 52. Second guide groove; 53. Dustproof plate; 54. Guide wheel; 55. Reserved hole; 56. Rubber pad; 61. Isolation plate; 62. Fixing groove; 63. First fixing strip; 64. Dust discharge port; 65. Airbag; 66. Connecting pipe; 67. Air jet head; 68. Dust collection port; 69. Sealing strip; 610. Lifting plate; 611. Telescopic spring; 612. Air inlet; 613. Fixing frame; 71. Second fixing strip; 72. Sliding block; 73. Fixed end; 74. Connecting rod; 75. Fixing block; 76. Connecting pin; 77. Scraper strip. Detailed Implementation

[0032] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1:

[0034] Please see Figure 1 - Figure 4As shown, a circular vibrating screen designed to prevent dust from flying includes a vibrating screen body 1, an excitation motor 2, a protective cover 3, and two filter screens 4. The protective cover 3 is fitted over the top of the vibrating screen body 1, allowing material to be conveyed to the top of the vibrating screen body 1. This allows the vibrating screen to shake the material during vibration, preventing it from spilling out from the edges. The two filter screens 4 are inclinedly arranged inside the vibrating screen body 1. The upper filter screen 4 filters larger materials, while smaller materials fall through. Similarly, the lower filter screen 4... The material in the middle is filtered, and smaller materials can fall from the bottom filter screen 4. The inclined filter screen 4 helps to shake the material from top to bottom. The excitation motor 2 is set on one side of the vibrating screen body 1. The excitation motor 2 is used to vibrate the filter screen 4. The excitation motor 2 of the vibrating screen body 1 shakes the filter screen 4, thereby shaking the material on the filter screen 4. After being screened, the material is separated from materials of different sizes. A dustproof structure 5 is provided between the top of the vibrating screen body 1 and one end of the protective cover 3. The dustproof structure 5 includes two first guide grooves 51. The two first guide grooves 51 are divided into two sections. The dustproof plate 53 is installed on both sides of the inner wall of the protective cover 3. A second guide groove 52 is provided at the bottom end of each of the two first guide grooves 51. The first guide grooves 51 and the second guide grooves 52 are connected. The two first guide grooves 51 and the two second guide grooves 52 are parallel to each other. A dustproof plate 53 is installed between the two first guide grooves 51, and guide wheels 54 are provided at each of the four corners of the dustproof plate 53. The four guide wheels 54 are located inside the first guide grooves 51 and the second guide grooves 52, and are slidably connected to the inside of the first guide grooves 51 and the second guide grooves 52 respectively. The dustproof plate 53 can move along the two sets of first guide grooves 51. The dustproof plate 53 slides between the two second guide grooves 52 and is located between the first guide grooves 51 to feed the material at the feed point into the filter screen 4. The dustproof plate 53 is located between the second guide grooves 52 to isolate the material at the feed point. A rubber pad 56 is installed at the bottom of the dustproof plate 53. The dustproof plate 53 and the rubber pad 56 are in contact to prevent dust from overflowing from inside the vibrating screen body 1. The two second guide grooves 52 are arranged at an angle so that the rubber pad 56 is in contact with the top of the vibrating screen body 1. The dust generated by the vibration inside the vibrating screen is isolated by the rubber pad 56 to prevent dust from being discharged from the feed point and discharge port of the vibrating screen body 1.

[0035] Please see Figure 3As shown, reserved holes 55 are provided on both sides of the protective cover 3 at the intersection of the first guide groove 51 and the second guide groove 52. The two reserved holes 55 are located on both sides of the protective cover 3. The diameter of the reserved holes 55 is larger than the diameter of the guide wheel 54. The reserved holes 55 are used to install the guide wheel 54 on both sides of the dustproof plate 53. The dustproof plate 53 is slid along the inside of the first guide groove 51 and the second guide groove 52. The guide wheels 54 on both sides of the dustproof plate 53 are aligned with the reserved holes 55 on both sides, so that the guide wheels 54 can be installed on both sides of the dustproof plate 53 from the reserved holes 55.

[0036] Please see Figure 3 As shown, the top of the protective cover 3 is equipped with two pins, and the edge of the dustproof plate 53 is provided with insertion holes. The two pins of the protective cover 3 are aligned with the insertion holes of the dustproof plate 53. The two pins on the protective cover 3 can be adjusted. One pin of the protective cover 3 can be inserted into the insertion hole of the dustproof plate 53 to lock the dustproof plate 53 in the position of the first guide groove 51. The pin is used to restrict the downward sliding of the dustproof plate 53. The other pin of the protective cover 3 can be inserted into the insertion hole of the dustproof plate 53 to lock the dustproof plate 53 in the position of the second guide groove 52.

[0037] It should be noted that when the material is fed into the top of the vibrating screen body 1, in order to prevent dust from spilling out of the vibrating screen during the vibrating screening of the material, a protective cover 3 can be installed on the top of the vibrating screen. The protective cover 3 can reduce dust spillage. However, some dust will spill out from the feed inlet at one end and the discharge outlet at the other end of the vibrating screen. A curtain can be sealed at the discharge outlet of the vibrating screen. A dustproof structure 5 can be installed at the feed inlet of the vibrating screen. When feeding, the dustproof plate 53 can be lifted along the second guide groove 52 and the first guide groove 51, and fixed by one of the pins. The material can enter the top of the vibrating screen body 1. When screening the material, the dustproof plate 53 can be pressed down to the second guide groove 52. The rubber pad 56 at the bottom of the dustproof plate 53 can contact the top of the vibrating screen body 1. When the vibrating screen is running, the dust will not spill out from the top of the vibrating screen body 1.

[0038] Example 2:

[0039] Please see Figure 2 , Figure 5 - Figure 8As shown, a dust removal structure 6 is provided in the space between the top of the vibrating screen body 1 and the inside of the protective cover 3. The dust removal structure 6 includes an isolation plate 61 arranged parallel to the protective cover 3. The isolation plate 61 is located between the vibrating screen body 1 and the protective cover 3 and is welded to the inner wall of the protective cover 3. The material moves along the inclined isolation plate 61. The inclined isolation plate 61 does not affect the sliding of the material. Several sets of first fixing strips 63 are installed on the surface of the isolation plate 61. The first fixing strips 63 are evenly spaced on the surface of the isolation plate 61 and are inclined on the surface of the isolation plate 61. Due to the inclined arrangement of the isolation plate 61 and the first fixing strips 63, dust enters the upper surface of the isolation plate 61 and falls along the first fixing strips 63, allowing the dust to enter the corner of the isolation plate 61 and the vibrating screen body 1. Under the action of the vibrating motor 2, the vibrating screen facilitates the entry of dust into the dust discharge port 64. The first fixing strip 63 has a dust collection port 68 inside, which connects the upper and lower surfaces of the isolation plate 61. The side wall of the first fixing strip 63 is equipped with a sealing strip 69. When the material vibrates at the top of the vibrating screen body 1, the dust will enter the dust collection port 68. Due to the up and down shaking of the vibrating screen body 1, the airflow in the protective cover 3 will be squeezed, which can push the sealing strip 69, so that the dust enters the upper surface of the isolation plate 61 with the dust collection port 68. The sealing strip 69 is used to prevent the dust from flowing back to the lower surface of the isolation plate 61. The inclined first fixing strip 63 and the inclined isolation plate 61 are used to accumulate dust at the corner of the isolation plate 61. The corner of the protective cover 3 is provided with a dust discharge port 64 for discharging dust.

[0040] Please see Figure 7 As shown, the surface of the isolation plate 61 is provided with an inclined fixing groove 62. The first fixing strip 63 is installed inside the fixing groove 62. The sealing strip 69 covers the upper outlet of the dust collection port 68. The sealing strip 69 is used to prevent dust from flowing back to the bottom of the isolation plate 61. The vibration of the vibrating screen causes the air inside the protective cover 3 to be slightly compressed, so that the airflow enters the dust collection port 68 and pushes the sealing strip 69. The airflow on the upper surface of the isolation plate 61 cannot push the sealing strip 69 into the dust collection port 68.

[0041] Please see Figure 6 and Figure 8As shown, a fixed frame 613 is provided at the corner of the surface of the isolation plate 61 and on one side of the dust discharge port 64. Inside the fixed frame 613, from top to bottom, are arranged an airbag 65, a lifting plate 610, and several telescopic springs 611. The lifting plate 610 is connected to the fixed frame 613 through the telescopic springs 611. The top and bottom of the airbag 65 are glued to the lifting plate 610 and the protective cover 3. The lifting plate 610 is located above the telescopic springs 611. When the vibrating screen vibrates, it can extend and retract the telescopic springs 611. 610 and airbag 65 rise and fall simultaneously. Airbag 65 is expanded or contracted by lifting plate 610 and protective cover 3. Extension spring 611 expands or contracts airbag 65 under the action of excitation motor 2. One side of airbag 65 is connected to a one-way air outlet connecting pipe 66. The cylindrical surface of connecting pipe 66 is provided with air jet head 67. Air jet head 67 is used to blow dust on the surface of isolation plate 61. When airbag 65 is compressed, airflow is blown from connecting pipe 66 to the surface of isolation plate 61, thereby blowing dust on the surface of isolation plate 61.

[0042] Please see Figure 8 As shown, one side of the airbag 65 is connected to a one-way air inlet 612, and the end of the air inlet 612 is located outside the protective cover 3. The number of jet nozzles 67 is matched with the number of the first fixing strips 63. When the airbag 65 is compressed, the airflow in the airbag 65 and the connecting pipe 66 can only blow onto the surface of the isolation plate 61. When the airbag 65 is pulled down by the lifting plate 610, the airflow outside the equipment can only enter the airbag 65 from the air inlet 612.

[0043] Please see Figure 8 As shown, an end cap is provided at the end of the air inlet 612, and the end cap is used to control the flow of air inside the airbag 65. When the lifting plate 610 and the protective cover 3 are close to each other, the airbag 65 is compressed, or when the lifting plate 610 and the protective cover 3 are far apart, the airbag 65 expands. When it is not necessary for the air inside the airbag 65 to change, the end cap of the air inlet 612 can be placed on the end of the air inlet 612 to avoid changes in the air inside the airbag 65.

[0044] It should be noted that the dust inside the vibrating screen body 1 can enter the upper surface of the isolation plate 61 through the dust collection port 68. The dust remains on the upper surface of the isolation plate 61. Due to the vibration of the vibrating screen, the extension spring 611 drives the lifting plate 610 and the air bag 65 to rise and fall, so the air bag 65 can expand or compress. When the air bag 65 changes from compression to expansion, the air inlet 612 can draw air into the air bag 65. When the air bag 65 is compressed, the air inside the air bag 65 can enter the surface of the isolation plate 61 through the connecting pipe 66 and the jet nozzle 67. The jet nozzle 67 blows the dust on the surface of the isolation plate 61. The dust is affected by the inclined isolation plate 61 and the inclined first fixing strip 63. Thus, under the action of the vibration of the vibrating screen and the blowing of the jet nozzle 67, the dust is transported to the dust discharge port 64. The dust can be collected at the dust discharge port 64. There is a plate at the bottom of the dust discharge port 64. The plate at the bottom of the dust discharge port 64 can be removed periodically to discharge the dust.

[0045] Example 3:

[0046] Please see Figure 2 and Figure 9 As shown, a scraping structure 7 is provided at the surface edge of the isolation plate 61. The scraping structure 7 includes several sliding blocks 72, which are welded to one edge of the surface of the isolation plate 61. A second fixing strip 71 is slidably connected inside the sliding block 72. The sliding blocks 72 are linearly installed at one edge of the surface of the isolation plate 61, and the second fixing strip 71 is installed inside the sliding block 72. The second fixing strip 71 can slide along the inside of the sliding block 72. A scraping strip 77 is provided on one side of the second fixing strip 71 and between each of the first fixing strips 63. The scraping strips 77 are evenly spaced on the surface of the isolation plate 61 and scrape... The distance between the strips 77 is adapted to the distance between the first fixing strips 63. The second fixing strip 71 slides along the inside of the sliding block 72, thereby the second fixing strip 71 drives the scraping strip 77 to move, scraping away some of the dust adhering to the surface of the isolation plate 61, thus preventing the accumulation of too much dust on the surface of the isolation plate 61. A fixing end 73 is welded to the top of the second fixing strip 71. A fixing block 75 is welded to the surface of the dustproof plate 53 at a position corresponding to the position of the connecting rod 74. A connecting rod 74 is connected between the fixing end 73 and the fixing block 75. The dustproof plate 53 is fixed by the pin on the protective cover 3, thereby fixing the extended connecting rod 74.

[0047] Please see Figure 9As shown, both ends of the connecting rod 74 are provided with connecting pins 76. The two ends of the connecting rod 74 are movably connected to the fixed end 73 and the fixed block 75 respectively through the connecting pins 76. The scraping strip 77 is slidably connected to the surface of the isolation plate 61. The connecting rod 74 is used to push the second fixed strip 71 and the scraping strip 77 to move. When the dustproof plate 53 is moved downward along the first guide groove 51 and the second guide groove 52, the connecting rod 74 can be pushed, so that the second fixed strip 71 moves along the inside of the sliding block 72. The scraping strip 77 can scrape the dust on the surface of the isolation plate 61.

[0048] It should be noted that when the dustproof plate 53 is raised or lowered along the first guide groove 51 and the second guide groove 52, it can drive the connecting rod 74 and the fixed end 73 to move. As a result, the second fixed bar 71 will drive each scraping bar 77 to move, so that the dust on the surface of the isolation plate 61 is scraped by the scraping bar 77. The vibration of the vibrating screen and the blowing of the air jet head 67 can make the scraped dust enter the dust discharge port 64, thus preventing the dust from adhering to the surface of the isolation plate 61.

[0049] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A circular vibrating screen for preventing dust from flying, comprising a vibrating screen body (1), an exciter motor (2), a protective cover (3), and two filter screens (4), wherein the protective cover (3) is fitted over the top of the vibrating screen body (1), the two filter screens (4) are inclinedly arranged inside the vibrating screen body (1), and the exciter motor (2) is arranged on one side of the vibrating screen body (1), the exciter motor (2) being used to vibrate the filter screens (4), characterized in that, A dustproof structure (5) is provided between the top of the vibrating screen body (1) and one end of the protective cover (3). The dustproof structure (5) includes two first guide grooves (51), which are respectively opened on both sides of the inner wall of the protective cover (3). A second guide groove (52) is opened at the bottom of each of the two first guide grooves (51). The first guide grooves (51) and the second guide grooves (52) are connected. A dustproof plate is installed between the two first guide grooves (51). (53), and guide wheels (54) are provided at the four corners of the dustproof plate (53). The four guide wheels (54) are located inside the first guide groove (51) and the second guide groove (52). The four guide wheels (54) are slidably connected to the inside of the first guide groove (51) and the second guide groove (52) respectively. A rubber pad (56) is installed at the bottom of the dustproof plate (53). The dustproof plate (53) and the rubber pad (56) are in contact to prevent dust from overflowing from the inside of the vibrating screen body (1).

2. The circular vibrating screen for preventing dust from flying as described in claim 1, characterized in that, The protective cover (3) has reserved holes (55) on both sides and at the intersection of the first guide groove (51) and the second guide groove (52). The diameter of the reserved holes (55) is larger than the diameter of the guide wheel (54). The reserved holes (55) are used to install the guide wheel (54) on both sides of the dustproof plate (53).

3. A circular vibrating screen for preventing dust from flying as described in claim 2, characterized in that, The top of the protective cover (3) is equipped with two pins, and the edge of the dustproof plate (53) is provided with insertion holes. The two pins of the protective cover (3) are aligned with the insertion holes of the dustproof plate (53). The pins are used to restrict the dustproof plate (53) from sliding downward.

4. A circular vibrating screen for preventing dust from flying as described in claim 3, characterized in that, A dust removal structure (6) is provided in the space between the top of the vibrating screen body (1) and the inside of the protective cover (3). The dust removal structure (6) includes an isolation plate (61) arranged parallel to the protective cover (3). The isolation plate (61) is located between the vibrating screen body (1) and the protective cover (3). The isolation plate (61) is welded to the inner wall of the protective cover (3). Several sets of first fixing strips (63) are installed on the surface of the isolation plate (61). The first fixing strips (63) are arranged at an angle. The first fixing strip (63) is placed on the surface of the isolation plate (61). A dust collection port (68) is provided inside the first fixing strip (63). The dust collection port (68) connects the upper surface and the lower surface of the isolation plate (61). A sealing strip (69) is installed on the side wall of the first fixing strip (63). The inclined first fixing strip (63) and the inclined isolation plate (61) are used to collect dust at the corner of the isolation plate (61). A dust discharge port (64) is provided at the corner of the protective cover (3) to discharge dust.

5. A circular vibrating screen for preventing dust from flying as described in claim 4, characterized in that, The surface of the isolation plate (61) is provided with an inclined fixing groove (62), the first fixing strip (63) is installed inside the fixing groove (62), and the sealing strip (69) covers the upper outlet of the dust collection port (68). The sealing strip (69) is used to prevent dust from flowing back to the bottom of the isolation plate (61).

6. A circular vibrating screen for preventing dust from flying as described in claim 5, characterized in that, A fixed frame (613) is provided at the corner of the surface of the isolation plate (61) and on one side of the dust outlet (64). Inside the fixed frame (613), from top to bottom, there are airbags (65), lifting plates (610) and several telescopic springs (611). The lifting plates (610) are connected to the fixed frame (613) through the telescopic springs (611). The top and bottom of the airbags (65) are glued to the lifting plates (610) and the protective cover (3). The telescopic springs (611) expand or contract the airbags (65) under the action of the excitation motor (2). One side of the airbags (65) is connected to a one-way air outlet connecting pipe (66). The cylindrical surface of the connecting pipe (66) is provided with a jet nozzle (67). The jet nozzle (67) is used to blow away the dust on the surface of the isolation plate (61).

7. A circular vibrating screen for preventing dust from flying as described in claim 6, characterized in that, One side of the airbag (65) is connected to a one-way air inlet (612), and the end of the air inlet (612) is located outside the protective cover (3). The number of the jet heads (67) is matched with the number of the first fixing strips (63).

8. A circular vibrating screen for preventing dust from flying as described in claim 7, characterized in that, The air inlet (612) is provided with an end cap, which is used to control the airflow inside the airbag (65). When the lifting plate (610) and the protective cover (3) are close to each other, the airbag (65) is compressed, or when the lifting plate (610) and the protective cover (3) are far apart, the airbag (65) expands.

9. A circular vibrating screen for preventing dust from flying, as described in claim 4 or 6, characterized in that, A scraping structure (7) is provided at the surface edge of the isolation plate (61). The scraping structure (7) includes several sliding blocks (72). The sliding blocks (72) are welded to one side edge of the surface of the isolation plate (61). A second fixing strip (71) is slidably connected inside the sliding block (72). A scraping strip (77) is provided on one side of the second fixing strip (71) and between each of the first fixing strips (63). A fixing end (73) is welded to the top of the second fixing strip (71). A fixing block (75) is welded to the surface of the dustproof plate (53) at a position corresponding to the position of the connecting rod (74). A connecting rod (74) is connected between the fixing end (73) and the fixing block (75).

10. A circular vibrating screen for preventing dust from flying as described in claim 9, characterized in that, Both ends of the connecting rod (74) are provided with connecting pins (76). The two ends of the connecting rod (74) are movably connected to the fixed end (73) and the fixed block (75) respectively through the connecting pins (76). The scraping strip (77) is slidably connected to the surface of the isolation plate (61). The connecting rod (74) is used to push the second fixed strip (71) and the scraping strip (77) to move.

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