A vibrating screen screen plate blind plate integrated device

Abstract

The application discloses a vibrating screen screen plate blind plate integrated device, and relates to the technical field of powder screening devices.The device comprises an integrally-formed plate body;mounting holes are arranged around the plate body;the upper portion of the plate body is a blind plate area, the blind plate area is a non-hole structure, and is used for blocking large materials and guiding the uniform distribution of the materials at the material inlet of the vibrating screen;the lower portion of the plate body is a screen plate area, the screen plate area is arranged with multiple rows and columns of screen holes, and is used for screening the materials.Through integrally forming the blind plate area and the screen plate area into a whole plate body, the connecting gap and the independent fixing point between the blind plate and the screen plate in the traditional split structure are eliminated, the problem of blind plate falling caused by bolt loosening is fundamentally solved, material blockage is avoided, and the production continuity is ensured;simultaneously, the non-hole blind plate area on the upper portion of the plate body can effectively block large materials, the screen plate area on the lower portion realizes accurate screening, the structure is compact, and installation is convenient.

Description

Technical Field

[0001] This invention relates to the field of powder screening equipment technology, and in particular to an integrated device for vibrating screen sieve plate and blind plate. Background Technology

[0002] Vibrating screens are key grading equipment in coal washing processes, widely used in raw coal grading, dewatering, and demediuming. The blind plate in front of the screen, located at the feed end, serves to block large pieces of material and guide the material to distribute evenly, making it a crucial component for ensuring the screening effect and safe operation of downstream equipment.

[0003] In existing technologies, the blind flange and screen plate are generally designed as separate components, each bolted to the screen frame. Due to long-term impact and vibration from materials, the bolts securing the blind flange can easily loosen and fall off, causing the blind flange to detach. Once detached, the blind flange loses its blocking function, potentially allowing large pieces of gangue and coal to directly enter the under-screen chute, causing severe blockages in subsequent coal washing equipment. Large materials can also become stuck in pipes and sorting equipment, causing blockages that are time-consuming to clean, severely impacting production continuity. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated device for the screen plate and blind plate of a vibrating screen, so as to overcome the defects of the existing split screen front blind plate, which is easy to fall off, resulting in frequent equipment blockage and great safety hazards in cleaning operations.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: An integrated device for a vibrating screen screen plate and blind plate includes an integrally formed plate body; mounting holes are provided around the plate body; the upper part of the plate body is a blind plate area, which is a non-perforated structure, used to block large pieces of material at the feed end of the vibrating screen and guide the material to be evenly distributed; the lower part of the plate body is a screen plate area, which is arranged with multiple rows and columns of screen holes for screening materials.

[0006] By molding the blind plate area and the screen plate area into a single integral plate, the connection gaps and independent fixing points between the blind plate and the screen plate in the traditional split structure are eliminated. This fundamentally solves the problem of blind plate falling off due to loose bolts, avoids material blockage, and ensures production continuity. At the same time, the non-perforated blind plate area at the top of the plate can effectively block large pieces of material, while the screen plate area at the bottom enables precise screening. The structure is compact and easy to install.

[0007] Preferably, the blind plate area of ​​the plate is divided into a receiving area and a guiding area. The upper surface of the receiving area is provided with a downwardly recessed receiving groove, which is located directly below the material drop point at the feed end of the vibrating screen. This groove is used to receive the falling material and form a protective material cushion layer within it. By setting a downwardly recessed receiving groove in the receiving area and placing it directly below the material drop point, the arc-shaped cross-section design of the receiving groove allows fine particles to preferentially settle at the bottom under vibration conditions and form a dynamically balanced material cushion layer. This cushion layer can maintain a certain thickness throughout the continuous feeding process, fundamentally avoiding direct rigid contact between the material and the metal surface of the plate, significantly reducing impact wear at the feed end, and extending the service life of the device.

[0008] Preferably, the receiving groove has an arc-shaped cross-section, with the bottom of the groove being the lowest point of the arc surface, and the edge of the receiving groove connecting to the upper surface of the blind plate with an arc-shaped transition. The receiving groove adopts an arc-shaped cross-section design, with the bottom being the lowest point of the arc surface and the edge using an arc-shaped transition connection. This structure, on the one hand, facilitates the convergence of fine particles towards the bottom of the groove under vibration, ensuring the stability and uniformity of the cushion layer formation; on the other hand, the arc-shaped transition eliminates stress concentration points, improves structural strength, and allows the material to smoothly climb and overflow along the arc surface under vibration, ensuring smooth material flow.

[0009] Preferably, the material guiding area has multiple guiding protrusions extending from the receiving groove towards the screen plate area, and inclined from the center to both sides; a guiding channel is formed between adjacent guiding protrusions. By setting guiding protrusions that extend inclined from the center to both sides in the material guiding area to form a guiding channel, the material buffered by the receiving area can be evenly guided and diverted from the center to both sides, ensuring that the material is evenly distributed in the width direction before entering the screen plate area, thereby improving the screening efficiency of the screen plate area and making full use of the entire screen surface area.

[0010] Preferably, a baffle strip is provided on the plate at the outlet position of the receiving groove, protruding from the upper surface of the plate; the height of the baffle strip is lower than the height of the guiding protrusion. By providing a baffle strip at the outlet position of the receiving groove, and ensuring its height is lower than the guiding protrusion, it acts as a "dam." It appropriately prevents material from flowing out of the groove quickly, allowing fine particles to further accumulate and compact at the outlet position, ensuring that the bottom of the groove is always covered with a material pad of sufficient thickness, maintaining the continuity and stability of the pad, thereby continuously protecting the bottom of the groove from impact and wear.

[0011] Preferably, the upper surface of the plate is uniformly patterned in the blind plate area, and the pattern is an array of diamond-shaped grooves. By uniformly setting the diamond-shaped groove array pattern on the upper surface of the blind plate area, the roughness of the upper surface of the plate is increased. These grooves can accumulate a small amount of coal powder or fine materials, forming a material cushion layer and reducing the friction between the coal powder and the plate surface.

[0012] Preferably, the sieve holes in the sieve plate area are elliptical holes, and the minor axis of the elliptical holes is aligned with the material flow direction; the sieve holes are evenly arranged in multiple rows and columns.

[0013] Preferably, the bottom of the plate body is provided with blind plate reinforcing ribs in the blind plate area; the blind plate reinforcing ribs are evenly distributed on the back of the plate body; the blind plate reinforcing ribs include receiving reinforcing ribs provided at the bottom of the receiving area and guiding reinforcing ribs provided at the bottom of the guiding area; multiple receiving reinforcing ribs are arranged in parallel, their extension direction is set along the material running direction, and they are set close to the receiving groove and connect the receiving groove and the plate body; multiple guiding reinforcing ribs are arranged in parallel, their extension direction is set perpendicular to the material running direction.

[0014] Preferably, the blind flange reinforcement also includes an edge reinforcement, which is disposed at the bottom of the blind flange area and arranged in a ring shape; the receiving reinforcement and the guiding reinforcement are respectively connected to the edge reinforcement.

[0015] After adopting the above technical solution, the beneficial effects of the present invention are: This invention provides an integrated device for a vibrating screen with a screen plate and blind plate. This device solves the technical problem that existing split-type screen front blind plates are prone to falling off, leading to frequent equipment blockages and significant safety hazards during cleaning operations. By molding the blind plate area and the screen plate area into a single integrated plate, this invention eliminates the connection gaps and independent fixing points between the blind plate and the screen plate in the traditional split structure. This fundamentally solves the problem of blind plate falling off due to loose bolts, avoids material blockage, and ensures continuous production. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an integrated vibrating screen plate and blind plate device according to the present invention; Figure 2 yes Figure 1 The front view; Figure 3 yes Figure 2 Middle AA side sectional view; Figure 4 yes Figure 1 A schematic diagram of the rear structure.

[0017] In the diagram, 1. Plate body, 10. Mounting hole, 11. Blind plate area, 111. Receiving area, 112. Guiding area, 12. Screen plate area, 121. Screen hole, 2. Receiving groove, 3. Guiding protrusion, 4. Guiding channel, 5. Blind plate reinforcing rib, 51. Receiving reinforcing rib, 52. Guiding reinforcing rib, 53. Ring edge reinforcing rib, 6. Screen plate reinforcing rib, 7. Material blocking strip, 8. Pattern structure. Detailed Implementation

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] The orientations mentioned in this specification are based on the orientation of the integrated vibrating screen plate and blind plate device of the present invention during normal operation, and do not limit the orientation during storage and transportation. They only represent relative positional relationships and do not represent absolute positional relationships.

[0020] like Figures 1-4 As shown, an integrated device for a vibrating screen plate and blind plate includes an integrally formed plate body 1. The plate body 1 is preferably made of high-strength wear-resistant alloy steel through integral casting, but it can also be made of other metal materials with sufficient strength and wear resistance through casting or forging to ensure service life under long-term heavy load and vibration conditions. Mounting holes 10 are provided around the plate body 1 for fixed connection to the screen frame via bolts. The bolt connection points are distributed around the plate body and can be connected using M16 high-strength bolts. The spacing between adjacent connection points is determined according to the position of the mounting holes in the screen frame (330-347.5 mm in this embodiment), and it is fixed to the screen frame using special pressure strips.

[0021] The upper part of plate 1 is a blind plate area 11, which is a solid structure without holes. It is used to block large pieces of material at the feed end of the vibrating screen and guide the material to be evenly distributed.

[0022] The lower part of the plate 1 is a sieve plate area 12, which is arranged with multiple rows and columns of sieve holes 121 for screening materials. In this embodiment, the sieve holes 121 of the sieve plate area 12 are elliptical holes, with the minor axis of the elliptical holes aligned with the material flow direction. The sieve holes 121 are evenly arranged in 7 rows and 5 columns, with the elliptical hole size being 80mm × 90mm and the hole spacing being 110mm longitudinally and 100mm transversely.

[0023] Furthermore, such as Figure 1 As shown, the blind plate area 11 of plate 1 is divided into a receiving area 111 and a guiding area 112. The upper surface of the receiving area 111 is provided with a downwardly recessed receiving groove 2, which is located directly below the material drop point at the feed end of the vibrating screen. It is used to receive the falling material and form a protective material pad layer within the receiving groove 2. The receiving groove 2, as part of plate 1, should be a recessed structure formed during the casting or forging process.

[0024] like Figure 3As shown, the cross-section of the receiving groove 2 is arc-shaped, with the bottom of the receiving groove 2 being the lowest point of the arc surface. The edge of the receiving groove 2 is connected to the upper surface of the plate 1 by an arc-shaped transition. The depth of the receiving groove 2 is 100mm, and the arc radius R is 150mm. This depth and arc ensure that fine particles are retained at the bottom of the receiving groove 2 under vibration conditions to form a cushion layer, while also ensuring that the material can climb along the arc surface and overflow smoothly under vibration. After the material enters the receiving groove 2, the arc-shaped bottom reduces the initial velocity of the material being thrown, and the fine particles preferentially deposit at the lowest point, forming a dynamically balanced material cushion layer during the vibration conveying process. The thickness of the cushion layer depends on the matching relationship between the feed rate and the vibration parameters. By setting a receiving groove with a specific arc-shaped cross-section, this invention utilizes the arc-shaped bottom structure to capture and retain fine particles, thereby continuously and stably maintaining the cushion layer thickness. The reliability and durability of the anti-wear effect are significantly better than the simple material stacking method of the prior art.

[0025] The material guiding area 112 is provided with multiple material guiding protrusions 3 extending from the material receiving groove 2 toward the screen plate area 12. Adjacent material guiding protrusions 3 form material guiding channels 4.

[0026] A baffle 7 is provided on the plate 1 at the outlet position of the receiving groove 2. The baffle 7 protrudes from the upper surface of the plate 1, and the height of the baffle 7 is lower than the height of the guiding protrusion 3.

[0027] The upper surface of the plate 1 is uniformly provided with a patterned structure 8 in the blind plate area 11. The patterned structure 8 is a diamond-shaped groove array with a groove depth of 1-5mm, which is used to store coal powder and increase the friction between the upper surface of the blind plate area 11 and the material.

[0028] The bottom of the plate 1, located in the blind plate area 11, is provided with blind plate reinforcing ribs 5. The blind plate reinforcing ribs 5 are evenly distributed on the back of the plate 1 to enhance the strength of the blind plate area 11 of the plate 1.

[0029] The blind flange reinforcing ribs 5 include receiving reinforcing ribs 51 disposed at the bottom of the receiving area 111 and guiding reinforcing ribs 52 disposed at the bottom of the guiding area 112. Multiple receiving reinforcing ribs 51 are arranged in parallel, extending along the material flow direction and closely attached to the receiving groove 2, connecting the receiving groove 2 to the plate body 1. Multiple guiding reinforcing ribs 52 are arranged in parallel, extending perpendicular to the material flow direction.

[0030] The blind flange reinforcing rib 5 also includes an edge reinforcing rib 53, which is located at the bottom of the blind flange area 11 and is arranged in a ring. The receiving reinforcing rib 51 and the guiding reinforcing rib 52 are respectively connected to the edge reinforcing rib 53.

[0031] The bottom of the plate 1 is provided with sieve plate reinforcing ribs 6 in the sieve plate area 12. The sieve plate reinforcing ribs 6 are evenly distributed on the back of the plate 1 to enhance the strength of the sieve plate area 12 of the plate 1.

[0032] During installation, place the integrated plate 1 into the feed end installation position from above the screen body, aligning the mounting holes 10 around the plate 1 with the mounting holes on the screen body frame, and then fix it to the screen body frame using a special pressure strip. Since the integrated plate 1 is positioned as a whole, the installation process is simple and efficient.

[0033] During operation, the process by which a dynamic protective pad layer is formed in the receiving groove 2 is as follows: After falling from the feed end, the material directly impacts the bottom of the receiving groove 2. Under the periodic vibration of the vibrating screen, the material is subjected to alternating projectile and fall along the arc surface of the groove. Due to its small mass and weaker projectile force, fine particles preferentially settle and remain at the lowest point of the arc bottom, gradually accumulating to form a material cushion layer covering the metal surface at the bottom of the groove. This cushion layer is in a dynamic equilibrium state under continuous feeding conditions—the material in the front cushion layer continuously moves forward and overflows the groove under the vibration conveying action, while the rear end is continuously replenished by newly falling fine particles, thus maintaining the relative stability of the cushion layer thickness. When large pieces of material impact this dynamic cushion layer, the impact energy is first absorbed and dispersed by the material particles in the cushion layer, which acts as a buffer, and then the remaining energy is transferred to the metal surface at the bottom of the groove, thereby significantly reducing the impact wear on the metal surface. At the same time, the arc-shaped groove structure disperses the impact force along the arc direction, further reducing stress concentration and extending the service life of the device. The baffle bar 7 provides some obstruction to the material, causing the powder to further accumulate at the discharge port, ensuring the continuity of the cushion layer. After passing the baffle bar 7, the material enters the guide zone 112 and, guided by the guide protrusion 3, enters the screen plate area 12 for screening.

[0034] Test conditions: Test equipment: ZK3675 linear vibrating screen, feed rate 300 t / h; vibration frequency 980 r / min; double amplitude 10 mm; material type: raw coal (particle size 0-300 mm, gangue content about 15%).

[0035] Control group: Traditional split blind plate + sieve plate (blind plate thickness 20mm, same material); Experimental group: the integrated device of this invention (plate thickness 20mm, same material).

[0036] The test cycle lasted 720 hours (30 days). The inspection node is shut down for inspection every 240 hours (10 days). II. Wear Comparison Data Average wear of the blind flange area after 240 hours of operation 1.8 mm 0.4 mm 77.8% Average wear of the blind plate area after 480 hours of operation 3.5 mm 0.9 mm 74.3% Average wear of the blind flange area after 720 hours of operation 5.2 mm 1.3 mm 75.0% Traditional split-type blind flanges (without grooved padding structure): the feed point directly bears the impact of the material, which is a typical example of impact abrasive wear. The device of this invention (grooved padding structure): the impact energy is absorbed by the padding material, and the metal surface only bears the pressure and friction, transforming the wear mechanism from impact abrasive wear to low-stress abrasive wear.

[0037] Comparison data of screening efficiency Screening efficiency (13mm grading) 88.5% 92.3% +3.8% Screening limit 8.2% 7.1% -1.1% Uniformity of material distribution on the screen surface (width direction) Uneven distribution, with less material on the sides and more in the middle. Uniform distribution Significant improvement In a split-type structure, material enters the screen surface through natural accumulation and diffusion after passing through a flat blind plate, resulting in uneven distribution in the width direction (the material layer thickness in the middle can be 2-3 times that on both sides), leading to low utilization of the effective screening area. This invention uses guiding protrusions to force diversion, resulting in a more uniform material distribution in the width direction and improved utilization of the effective screening area.

[0038] After a 720-hour (30-day) continuous operation comparative test, the results showed that: 1. Wear resistance: The average wear of the blind plate area of ​​the integrated device of this invention is 1.3mm, which is about 75% lower than the 5.2mm of the traditional split blind plate, and the service life is extended by more than 3 times.

[0039] 2. Screening performance: The screening efficiency of the device of the present invention is 92.3%, which is 3.8 percentage points higher than that of the control group (88.5%), and the uniformity of material distribution is significantly improved.

[0040] Comparative tests showed that, under the same feed rate (300 t / h) and vibration parameters (frequency 980 r / min, double amplitude 10 mm), after 720 hours of continuous operation, the integrated device of this invention exhibited an average wear of only 1.3 mm in the blind plate area, while the traditional split blind plate showed an average wear of 5.2 mm under the same conditions, representing a wear reduction of approximately 75%. The device of this invention did not experience any blind plate detachment failures, while the split blind plate, under the same conditions, began to show bolt loosening after an average of approximately 240 hours of operation, with a total of 3 blind plate detachment failures occurring within 720 hours. These data demonstrate that this invention not only fundamentally solves the blind plate detachment problem but also significantly extends the overall service life of the device through the material receiving groove pad structure, improves the uniformity of material distribution in the width direction of the screen surface, and enhances screening efficiency.

[0041] In the field of vibrating screen technology, those skilled in the art generally believe that blind plates are vulnerable parts and should be designed as separate components for individual replacement. Integrating the blind plate with the screen plate means that if any part fails, the entire plate must be replaced, resulting in excessively high costs. Therefore, there has long been a technical bias that "blind plates must be installed separately." However, in actual use, the production losses caused by blind plate detachment far exceed the replacement cost of the plate itself. This invention overcomes the aforementioned technical bias by optimizing the overall structural strength (by adding blind plate reinforcing ribs, material receiving reinforcing ribs, and edge reinforcing ribs, etc.) and achieving an integrated design while ensuring service life.

[0042] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. An integrated device for vibrating screen sieve plate and blind plate, characterized in that: It includes a one-piece molded plate; the plate has mounting holes around its perimeter; The upper part of the plate is a blind plate area, which is a non-porous structure used to block large pieces of material at the feed end of the vibrating screen and guide the material to be evenly distributed. The lower part of the plate is a sieve plate area, which is arranged with multiple rows and columns of sieve holes for screening materials.

2. The integrated device for vibrating screen plate and blind plate according to claim 1, characterized in that: The blind plate area of ​​the plate is divided into a receiving area and a guiding area; The upper surface of the receiving area is provided with a downwardly recessed receiving groove, which is located directly below the material drop point at the feed end of the vibrating screen. It is used to receive the falling material and form a protective material pad layer in the receiving groove.

3. The integrated device for vibrating screen plate and blind plate according to claim 2, characterized in that: The cross-section of the receiving groove is arc-shaped, with the bottom of the receiving groove being the lowest point of the arc surface, and the edge of the receiving groove and the upper surface of the blind plate forming an arc-shaped transition connection.

4. The integrated device for vibrating screen plate and blind plate according to claim 2, characterized in that: The material guiding area is provided with multiple material guiding protrusions extending from the material receiving groove towards the screen plate area and inclined from the middle to both sides; a material guiding channel is formed between adjacent material guiding protrusions.

5. The integrated device for vibrating screen plate and blind plate according to claim 2, characterized in that: A baffle strip is provided on the plate at the outlet position of the receiving groove, and the baffle strip protrudes from the upper surface of the plate; the height of the baffle strip is lower than the height of the guiding protrusion.

6. The integrated device for vibrating screen plate and blind plate according to claim 2, characterized in that: The upper surface of the plate is uniformly provided with a patterned structure in the blind plate area, and the patterned structure is an array of diamond-shaped grooves.

7. The integrated device for vibrating screen plate and blind plate according to claim 1, characterized in that: The sieve holes in the sieve plate area are elliptical holes, and the minor axis of the elliptical holes is aligned with the material flow direction; the sieve holes are evenly arranged in multiple rows and columns.

8. The integrated device for vibrating screen plate and blind plate according to claim 1, characterized in that: The bottom of the plate body is provided with blind plate reinforcing ribs in the blind plate area; the blind plate reinforcing ribs are evenly distributed on the back of the plate body; the blind plate reinforcing ribs include receiving reinforcing ribs provided at the bottom of the receiving area and guiding reinforcing ribs provided at the bottom of the guiding area; multiple receiving reinforcing ribs are arranged in parallel, their extension direction is set along the material running direction, and they are set close to the receiving groove and connect the receiving groove to the plate body; multiple guiding reinforcing ribs are arranged in parallel, their extension direction is perpendicular to the material running direction.

9. The integrated device for vibrating screen plate and blind plate according to claim 8, characterized in that: The blind plate reinforcing rib also includes an edge reinforcing rib, which is disposed at the bottom of the blind plate area and arranged in a ring; the receiving reinforcing rib and the guiding reinforcing rib are respectively connected to the edge reinforcing rib.

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