A vibrating screen pulse air blowing dynamic self-cleaning anti-blocking device

Abstract

The utility model discloses a vibrating screen pulse air blowing dynamic self -cleaning anti -blocking device, including frame, vibration feeding assembly, roller pressure subassembly, vibrating screen subassembly, pulse jet subassembly and controller. Vibration feeding assembly even delivery material to the crushing of roller pressure subassembly, and the material is classified after crushing and enters vibrating screen subassembly grading through the guide chute, and pulse jet subassembly impacts the screen surface through high -frequency airflow, prevents material adhesion and blocks the screen hole, and the accurate separation of different particle size materials of double -deck screen, and controller cooperates and regulates each component operation. The device integrates the feeding, crushing, screening and anti -blocking function, solves traditional equipment screen jam, low -grade precision problem, and promotes the production efficiency and quality of machine -made sand.

Description

Technical Field

[0001] This utility model relates to the field of mining machinery technology, and in particular to a dynamic self-cleaning and anti-clogging device for a vibrating screen using pulse air blowing. Background Technology

[0002] In the field of manufactured sand production, crushing and screening of materials are the core processes, and their efficiency and stability directly affect the quality of the finished sand (such as particle size uniformity and powder content) and the production line capacity.

[0003] Traditional manufactured sand production equipment typically employs a split layout of "crushing equipment + independent screening equipment." Materials must be crushed before being conveyed by belt to the screening equipment for grading. This process involves numerous interconnected steps, occupies a large area, and suffers from the following prominent problems: 1. Screen clogging is common: Manufactured sand raw materials are mostly hard rocks such as granite and limestone. After crushing, the materials have sharp edges and rough surfaces, easily embedding or accumulating in the screen mesh. Clogging is particularly severe when processing high-moisture or fine-particle materials. Traditional screening equipment relies on simple mechanical vibration for unclogging, which cannot effectively remove deeply attached materials, leading to decreased screening efficiency and requiring frequent shutdowns for manual cleaning, severely impacting production continuity. 2. Insufficient grading accuracy: Traditional screening equipment often uses single-layer or simple double-layer screens, which are not precise enough for grading materials of different particle sizes. Problems such as "large particles mixed into fine sand" or "fine particles remaining on the coarse screen" frequently occur, resulting in uneven particle size distribution in the finished sand, making it difficult to meet the high standards (such as a fineness modulus of 2.3~3.0) required for manufactured sand in the construction and concrete industries. 3. Poor coordination between crushing and screening: Traditional crushing equipment (such as jaw crushers and impact crushers) only handles material crushing and does not form a linkage control with screening equipment. The particle size of the crushed material fluctuates greatly, which can easily cause uneven load on the screening equipment, and even cause screen overload damage due to excessive accumulation of large particles. 4. Uneven material conveying: Traditional feeding devices are mostly belt conveyors or simple vibrating feeders. During the conveying process, the material is prone to blockage or local overload at the feed inlet of the crushing equipment due to unstable conveying speed or uneven distribution, which affects the crushing efficiency. At the same time, uneven material distribution will also reduce the working efficiency of the screening equipment.

[0004] Therefore, there is an urgent need for an integrated and efficient manufactured sand production equipment to solve problems such as screen clogging, low grading accuracy, and poor coordination, so as to improve the continuity of manufactured sand production and product quality. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a dynamic self-cleaning and anti-clogging device for a vibrating screen by pulse air blowing.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: This utility model discloses a dynamic self-cleaning and anti-clogging device for a vibrating screen using pulse air blowing, comprising a frame; a vibrating feeding assembly is provided at the top of the frame for conveying the material to be processed along an inclined direction to the crushing process; a roller pressing assembly is provided directly below the discharge end of the vibrating feeding assembly for crushing the material; a vibrating screening assembly is connected to the end of the roller pressing assembly via a guide groove, and the vibrating screening assembly is located inside the lower side of the frame for classifying and screening the crushed material; a pulse blowing assembly is fixedly provided above the vibrating screening assembly for cleaning the screen of the vibrating screening assembly. The material adhering to the surface is subjected to high-frequency pulse impact to prevent screen hole clogging; the two opposite sides of the vibrating screening component are respectively provided with a first slag discharge channel and a second slag discharge channel arranged in parallel, the first slag discharge channel is located below the end of the upper screen of the vibrating screening component, and the second slag discharge channel is located below the end of the lower screen of the vibrating screening component; the bottom of the vibrating screening component is provided with a feeding hopper for collecting fine particulate material passing through the lower screen; the side of the frame is provided with a controller for controlling the coordinated operation of the vibrating feeding component, the roller pressing component, the vibrating screening component and the pulse jet blowing component.

[0007] As a preferred embodiment of this utility model, the vibrating feeding assembly includes a feeding trough inclinedly disposed on the top of the frame, the inclination angle of the feeding trough being 5°~15°; the bottom of the feeding trough is connected to the top of the frame via a support spring and a support guide column, wherein the support spring restricts the feeding trough to vibrate only in the vertical direction, and the support guide column passes through a through hole at the bottom of the feeding trough and slides in cooperation with the feeding trough; a feeding vibration motor is fixed at the center of the bottom of the feeding trough for generating vibration driving force; the inner wall of the feeding trough is provided with a guide protrusion with an arc-shaped cross-section along its length direction for assisting in the uniform distribution of materials and reducing accumulation.

[0008] As a preferred embodiment of this utility model, the roller pressing assembly includes an upper guide roller and a lower guide roller arranged in parallel. The upper part of the gap between the roller surfaces of the upper and lower guide rollers is flush with the discharge end port of the feed chute. The roller pressing assembly also includes a crushing roller group, a drive gear group, and a driven gear group. The crushing roller group includes a first crushing roller and a second crushing roller that rotate in opposite directions. The roller surface of the crushing roller group forms a crushing gap with the roller surfaces of the upper and lower guide rollers. The bottom of the crushing gap is flush with the top opening of the feed chute. The roller surfaces of the first and second crushing rollers are both provided with crushing teeth, and they achieve reverse rotation through the meshing transmission of the drive gear group and the driven gear group. The drive side of the second crushing roller is also provided with a drive pulley and a roller pressing drive motor, and is connected to the output shaft belt of the roller pressing drive motor. The driven gear group is located at the ends of the upper and lower guide rollers and meshes with the drive gear group to achieve synchronous transmission with the crushing roller group.

[0009] As a preferred embodiment of this utility model, the vibrating screening assembly includes a screen frame, inside which a double-layer screen is fixed. The double-layer screen includes an upper coarse screen and a lower fine screen. The screen aperture of the upper coarse screen is 2-5 mm, and the screen aperture of the lower fine screen is 0.5-2 mm. The bottom of the screen frame is connected to the machine frame via an elastic support. Screening vibration motors are fixed on both sides of the screen frame to generate simple harmonic vibration in the horizontal direction. The end of the upper coarse screen extends above the inlet of the first slag discharge channel, and the end of the lower fine screen extends above the inlet of the second slag discharge channel. A hopper is provided below the lower fine screen, and a discharge port is provided at the bottom of the hopper.

[0010] As a preferred technical solution of this utility model, the pulse jet assembly includes an air source, a pulse valve, and a jet pipe; the air source is connected to the air inlet of the pulse valve through an air pipe, and the air outlet of the pulse valve is connected to the jet pipe; the jet pipe is horizontally arranged above the screen frame along the width direction of the vibrating screening assembly, and the bottom of the jet pipe is provided with a plurality of nozzles facing the screen.

[0011] As a preferred embodiment of this utility model, the top opening of the guide chute is flush with the bottom of the crushing gap, which is used to guide the crushed material onto the screen of the vibrating screening assembly.

[0012] This utility model addresses the core pain points in manufactured sand production by integrating vibration feeding, roller crushing, pulse air blowing anti-clogging, and precision screening functions to form an integrated continuous production system of "crushing-screening-anti-clogging".

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. Dynamic anti-clogging with pulsed air blowing significantly improves screening efficiency: A pulsed air blowing component is installed above the vibrating screen assembly. High-pressure airflow is periodically released from an air source and, after being controlled by a pulse valve, is ejected at high speed from multiple nozzles in the blowing pipe. This high-frequency impact effectively breaks down the adhesion between the material and the screen, preventing deep clogging. Compared to traditional mechanical vibration unclogging methods, this device improves unclogging efficiency by over 40%, extends the continuous operating time of the screening equipment by 2-3 times, and significantly reduces downtime for maintenance. 2. Synergistic operation of crushing and screening optimizes production continuity: The bottom of the crushing gap of the roller press assembly is flush with the top of the guide chute, and the end of the guide chute directly connects to the screen of the vibrating screen assembly. The crushed material can enter the screening stage without additional transfer, forming a continuous "crushing-screening" operation process. Simultaneously, the screening vibration motor of the vibrating screen assembly and the drive motor of the roller press assembly are controlled collaboratively by a controller, avoiding overload or uneven load on the screening equipment caused by fluctuations in crushed particle size, thus improving system stability. 3. Double-layer precise grading to ensure the quality of finished sand: The double-layer screen of the vibrating screen component (upper coarse screen with an aperture of 2~5mm and lower fine screen with an aperture of 0.5~2mm) can accurately separate large particles (>5mm), medium particles (0.5~5mm) and fine particles (<0.5mm). The fine particles are collected centrally through the hopper, while the medium and large particles are discharged through the first and second slag discharge channels respectively. They can be used as finished manufactured sand or as raw materials for further crushing, realizing the tiered utilization of materials. The fluctuation range of the fineness modulus of the finished sand is reduced to ±0.2, which significantly improves product consistency. 4. Uniform and stable vibratory feeding, reducing failures in the conveying process: The feeding trough of the vibratory feeding assembly restricts the vibration direction (vertical only) through support springs and guide columns. Combined with the simple harmonic vibration of the feeding vibratory motor, the material is evenly distributed along the inclined trough, avoiding "material accumulation" or "flow interruption" phenomena. The arc-shaped guide protrusions on the inner wall further enhance the dispersion of the material, preventing blockage of the crushing equipment's feed inlet due to material accumulation, reducing the failure rate of the conveying process, and solving the blockage problem caused by uneven material conveying in the background technology. 5. Integrated design saves space and energy: The device integrates vibratory feeding, roller crushing, screening and anti-clogging functions into the same frame, with a compact structure that reduces the floor space by 30% to 40% compared to traditional split-type equipment; at the same time, the controller can adjust the operating parameters of each component in real time to optimize energy consumption, which is in line with the concept of green manufacturing.

[0014] In summary, this utility model effectively solves the problems of screen clogging, low grading accuracy, and poor equipment coordination in the production of manufactured sand. It has significant advantages in improving production efficiency, ensuring product quality, and reducing operating costs, and is suitable for large-scale industrial production of manufactured sand such as building sand and concrete aggregate. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is the front view of this utility model; Figure 3 This is a top view of the present invention; Figure 4 This is a cross-sectional structural schematic diagram of the present invention; In the diagram: 1. Frame; 2. Vibrating feeding assembly; 3. Roller pressing assembly; 4. Vibrating screening assembly; 5. Pulse jet blowing assembly; 6. Controller; 11. Guide chute; 12. First slag discharge channel; 13. Second slag discharge channel; 14. Feed hopper; 21. Feed chute; 22. Support spring; 23. Support guide column; 24. Feeding vibrating motor; 31. Upper guide roller; 32. Lower guide roller; 33. Crushing roller assembly; 34. Drive gear assembly; 5. Driven gear set; 36. Drive pulley; 37. Roller drive motor; 41. Screen frame; 42. Double-layer screen; 43. Screening vibration motor; 44. Elastic support seat; 51. Air source; 52. Pulse valve; 53. Blowing pipe; 141. Discharge port; 211. Guide protrusion; 331. First crushing roller; 332. Second crushing roller; 333. Crushing teeth; 421. Upper coarse screen; 422. Lower fine screen; 531. Nozzle. Detailed Implementation

[0016] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0017] In the attached diagram, all identical reference numerals refer to the same components.

[0018] Example 1: Production scenario of manufactured sand for conventional hardness rock This embodiment is applicable to processing medium-hardness rocks such as granite and limestone, with the target production of manufactured sand with a particle size of 0.5~5mm. The focus is on verifying the dynamic anti-clogging effect of the pulse jet assembly on the screen.

[0019] like Figure 1-4 As shown, the device uses a metal frame 1 as a support frame, and the components are arranged in sequence according to the material flow direction.

[0020] Vibrating feeding assembly 2: The inclined feeding trough 21 is connected to the top of the frame 1 via a support spring 22 and a support guide column 23 at its bottom. The support spring 22 is sleeved around the support guide column 23, restricting the feeding trough 21 to reciprocate only in the vertical direction; the upper end of the support guide column 23 is welded and fixed to the frame 1, and the lower end passes through the through hole at the bottom of the feeding trough 21 and is clearance-fitted with the through hole to ensure the horizontal stability of the feeding trough 21 during vibration. The feeding vibration motor 24 is fixed to the center of the bottom of the feeding trough 21 by bolts, and its output shaft is rigidly connected to the bottom surface of the feeding trough 21. The inner wall of the feeding trough 21 has an integrally formed arc-shaped cross-section guide protrusion 211 along its length, and the height of the protrusion is 1 / 5 of the depth of the feeding trough 21, which is used to evenly disperse the blocky rocks to the bottom of the feeding trough 21 and avoid accumulation.

[0021] Please see Figure 2 , Figure 4Roller assembly 3: An upper guide roller 31 and a lower guide roller 32 are arranged parallel to each other below the discharge end of the feed trough 21. Both rollers have smooth metal surfaces, and the gap is adjusted to be slightly larger than the maximum initial particle size of the rock (approximately 30 mm). The two ends of the upper guide roller 31 and the lower guide roller 32 are connected to the frame 1 through bearing seats and can only rotate around a horizontal axis. The crushing roller group 33 is located directly below the gap between the upper guide roller 31 and the lower guide roller 32, including a first crushing roller 331 and a second crushing roller 332 that rotate in opposite directions. Both rollers have crushing teeth 333 with a height of 5~8 mm and a tooth tip angle of 60° evenly distributed on their surfaces. The driving side of the first crushing roller 331 and the second crushing roller 332 is fixed with the driving gear group 34 and the driven gear group 35, respectively. The driven gear group 35 is fitted onto the driving end of the upper guide roller 31 and the lower guide roller 32 and meshes with the driving gear group 34 to realize the synchronous reverse rotation of the crushing roller group 33 and the guide rollers. The non-drive side of the second crushing roller 332 is fixed to the drive pulley 36 via a flat key, and is connected to the pulley on the output shaft of the roller drive motor 37 via a V-belt, with the roller drive motor 37 providing rotational power. The bottom of the gap between the roller surfaces of the crushing roller group 33, the upper guide roller 31, and the lower guide roller 32 is flush with the top opening of the guide trough 11. The guide trough 11 is an inclined steel plate trough with an inclination angle of 10°, used to guide the crushed material onto the screen of the vibrating screen assembly 4.

[0022] Please see Figure 4 Vibrating screen assembly 4: Screen frame 41 is a rectangular metal frame with a double-layer screen 42 fixed inside. The upper coarse screen 421 is made of manganese steel woven mesh with a screen aperture of 3mm; the lower fine screen 422 is made of polyurethane-coated steel wire mesh with a screen aperture of 1mm. The bottom of the screen frame 41 is connected to the frame 1 through four sets of elastic support seats 44. The elastic support seats 44 are composed of rubber pads and helical springs, which can absorb the impact of screening vibration on the frame 1. Screening vibration motors 43 are fixed to both sides of the screen frame 41 by bolts. The two motors rotate in opposite directions, generating simple harmonic vibration in the horizontal direction (amplitude of 5mm, frequency of 800 times / minute). The end of the upper coarse screen 421 is inclined downward at 15°, extending above the inlet of the first slag discharge channel 12; the end of the lower fine screen 422 is inclined downward at 15°, extending above the inlet of the second slag discharge channel 13. The first slag discharge channel 12 and the second slag discharge channel 13 are both inclined steel plate troughs (inclination angle 15°), used to discharge large particles (>3mm) that did not pass through the upper screen and medium particles (1~3mm) that passed through the upper screen but not the lower screen, respectively. A feed hopper 14 is fixed below the lower fine screen 422. It is an inverted cone-shaped metal hopper with a bottom discharge port 141 diameter of 200mm, used to collect fine particles (<1mm) that passed through the lower screen, i.e., the target manufactured sand.

[0023] Pulse jet assembly 5: The air source 51 is an air compressor (working pressure 0.6MPa), which is connected to the air inlet of pulse valve 52 through a high-pressure air pipe. The air outlet of pulse valve 52 is sealed to the left end of jet pipe 53. Jet pipe 53 is a seamless steel pipe, horizontally positioned 300mm above screen frame 41 along the width direction of vibrating screen assembly 4. Eight nozzles 531 (nozzle diameter 8mm) are evenly distributed along the length direction of its bottom. The outlet of nozzle 531 faces the screen surface at an angle of 45° with the screen. Pulse valve 52 is controlled by controller 6 and can be opened periodically (cycle is 0.5 seconds), with each opening time being 0.1 seconds, instantly releasing high-pressure airflow into jet pipe 53, which impacts the fine particles or mud clumps attached to the screen surface through nozzles 531 at a high frequency.

[0024] Controller 6: This is a PLC controller. Its input terminal is connected to the operating status sensors (such as current sensors and vibration frequency sensors) of each vibration motor and drive motor. Its output terminal controls the start, stop and speed of the feeding vibration motor 24, the roller drive motor 37 and the screening vibration motor 43 through relays. At the same time, it controls the pulse frequency of the pulse valve 52 (set to 1Hz in this embodiment).

[0025] Workflow: Rock material is vibrated and conveyed to the roller pressing assembly 3 via the feed chute 21. Its posture is adjusted by the upper guide roller 31 and lower guide roller 32, and it falls into the crushing gap of the crushing roller group 33. It is then crushed to ≤5mm by the counter-rotating crushing teeth 333. After crushing, the material falls through the guide chute 11 onto the upper coarse screen 421 of the vibrating screen assembly 4, moving towards the end with the horizontal vibration of the screen frame 41. Large particles (>3mm) that do not pass through the upper screen fall into the first slag discharge channel 12 and are discharged, returning to the roller pressing assembly 3 for further crushing. Medium particles (1~3mm) that pass through the upper screen fall onto the lower fine screen 422 and continue to vibrate and move. Medium particles (1~3mm) that do not pass through the lower screen fall into the second slag discharge channel 13 and are discharged as intermediate-sized aggregate. Fine particles (<1mm) that pass through the lower screen fall into the feed hopper 14 and are collected as manufactured sand through the discharge port 141.

[0026] Synchronously, the controller 6 controls the pulse valve 52 to open periodically, and the high-pressure airflow continuously impacts the surface of the upper coarse screen 421 and the lower fine screen 422 through the nozzle 531: when fine particles or mud clumps are attached to the screen surface, the pulse airflow peels them off to avoid clogging the screen holes; when the material has a high moisture content (moisture content ≤8%), the pulse impact force can break up the mud clumps and allow them to pass through the screen, ensuring stable screening efficiency.

[0027] Example 2: Production scenario of manufactured sand from high-humidity clay ore This embodiment focuses on verifying the synergistic anti-clogging capability of pulse jet injection and screening vibration for clayey ores (such as shale and mudstone) with high mud content (moisture content of 10%~15%) and easy adhesion.

[0028] Key structural adjustments: Vibrating screen assembly 4: The lower fine screen 422 is replaced with a perforated aluminum plate (screen hole diameter 1mm, hole spacing 1.5mm), and the surface is coated with polytetrafluoroethylene coating (thickness 0.1mm) to reduce the adhesion of mud; the hardness of the rubber pad of the elastic support seat 44 is increased from Shore 60 to Shore 70 to enhance the vibration rigidity of the screen frame 41 and avoid vibration attenuation caused by mud accumulation.

[0029] Pulse jet assembly 5: The air source 51 is equipped with a pre-dryer (filtering air humidity to ≤30%), the number of nozzles 531 is increased to 12 (the spacing is reduced to 20mm), the pulse frequency is increased to 2Hz (cycle 0.5 seconds), and the single pulse width is shortened to 0.08 seconds, so as to impact the mud with a denser high-frequency airflow.

[0030] Please see Figure 4 Roller assembly 3: The crushing teeth 333 are changed to conical shape (apex angle 90°) and the tooth height is increased to 10mm, which enhances the tearing and crushing ability of clay ore and reduces the size of mud lumps.

[0031] Functional Enhancement Description: After the high-moisture ore enters the roller pressing assembly 3, the conical crushing teeth 333 separate the ore from the clay through compression and shearing, and the clay clumps are crushed into particles with a diameter ≤5mm. When the crushed material falls onto the upper coarse screen 421 of the vibrating screen assembly 4, the high-frequency vibration (frequency 1000 times / minute) of the screening vibration motor 43 initially loosens the clay clumps; when the unloosened clay clumps move to the end of the screen with the material, they are impacted by the high-frequency airflow (2Hz) of the pulse jet assembly 5, and the internal stress of the clay clumps exceeds the bonding strength and they break. Fine particles (<1mm) pass through the screen to become manufactured sand, while coarse particles (>3mm) are thrown to the first slag discharge channel 12.

[0032] If the mud adheres severely (e.g., the ore moisture content is >15%), the controller 6 automatically increases the opening pressure of the pulse valve 52 (from 0.6MPa to 0.8MPa) while reducing the amplitude of the screening vibration motor 43 (from 5mm to 3mm). Through the combination of "strong impact + weak vibration", the mud clumps are prevented from clogging the screen holes, while the screen is prevented from deforming due to excessive vibration.

[0033] Example 3: Multi-size graded manufactured sand production scenario This embodiment is used to produce two different specifications of manufactured sand (coarse sand: 1~3mm, fine sand: 0.5~1mm), highlighting the flexible adaptability of double-layer screen and pulse jet cleaning.

[0034] Structural Adjustment and Function: Vibrating Screen Component 4: The upper coarse screen 421 is replaced with a stainless steel woven mesh with a screen aperture of 2mm. The lower fine screen 422 is divided into two sections: the left section has a screen aperture of 1mm (for producing fine sand), and the right section has a screen aperture of 0.5mm (for producing ultrafine sand). The right end of the lower fine screen 422 extends above the inlet of the second slag discharge channel 13, through which intercepted particles are discharged. The two screen sections are detachably connected by bolts and can be switched according to production needs.

[0035] Pulse jet assembly 5: The jet pipe 53 corresponds to the two sections of the lower fine screen 422, and two sets of nozzles 531 are set respectively: the left section nozzle (corresponding to 1mm screen hole) has a jet pressure of 0.5MPa, and the right section nozzle (corresponding to 0.5mm screen hole) has a jet pressure of 0.7MPa. Because the small screen hole is more prone to clogging, higher pressure is required to remove the attached fine particles.

[0036] Controller 6: Added mode selection function. The target sand type (coarse sand / fine sand / ultrafine sand) can be input through the operation panel, and the frequency of the screening vibration motor 43 (coarse sand mode: 700 times / minute; fine sand mode: 900 times / minute), the pulse frequency of the pulse valve 52 (coarse sand mode: 0.8Hz; fine sand mode: 1.2Hz) and the nozzle injection pressure can be automatically adjusted.

[0037] Example of operation: When fine sand (0.5~1mm) needs to be produced, the controller 6 sets the frequency of the screening vibration motor 43 to 900 times / minute, the frequency of the pulse valve 52 to 1.2Hz, and the pressure of the right section nozzle (0.5mm screen area) to 0.7MPa. After crushing, the material falls to the upper coarse screen 421 (2mm aperture), and particles larger than 2mm fall into the first slag discharge channel 12; particles of 1~2mm fall to the left section of the lower fine screen 422 (1mm aperture), of which particles of 0.5~1mm fall into the feed hopper 14 as fine sand, and particles smaller than 0.5mm pass through the left section screen and fall to the right section screen (0.5mm aperture), of which ultrafine sand smaller than 0.5mm falls into the collection port on the right side of the feed hopper 14, and particles larger than 0.5mm are intercepted by the right section screen and discharged through the second slag discharge channel 13 at the end of the right section. Simultaneously, a high-frequency pulsed airflow (1.2Hz) powerfully impacts the right-side screen (0.5mm aperture) to remove adhering fine powder and ensure the sieving efficiency of the small screen openings.

[0038] In summary, the above embodiments demonstrate the universality of this utility model patent in conventional rock, high-humidity clayey ore, and multi-particle-size classification scenarios by adjusting the screen aperture, pulse parameters, and vibration frequency. The core lies in the synergistic anti-clogging mechanism of vibrating screening and pulsed air blowing, which effectively solves the industry problem of easy screen clogging in manufactured sand production.

[0039] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A dynamic self-cleaning and anti-clogging device for a vibrating screen using pulsed air blowing, characterized in that, The system includes a frame (1); a vibrating feeding assembly (2) is provided on the top of the frame (1) for conveying the material to be processed to the crushing process along an inclined direction; a roller pressing assembly (3) is provided directly below the discharge end of the vibrating feeding assembly (2) for crushing the material; a vibrating screening assembly (4) is connected to the end of the roller pressing assembly (3) via a guide trough (11); the vibrating screening assembly (4) is located inside the lower side of the frame (1) for classifying and screening the crushed material; a pulse jet blowing assembly (5) is fixedly provided above the vibrating screening assembly (4) for high-frequency pulse impact on the material adhering to the screen surface of the vibrating screening assembly (4) to prevent To prevent screen hole blockage; the two opposite sides of the vibrating screen assembly (4) are respectively provided with a first slag discharge channel (12) and a second slag discharge channel (13) arranged in parallel. The first slag discharge channel (12) is located below the end of the upper screen of the vibrating screen assembly (4), and the second slag discharge channel (13) is located below the end of the lower screen of the vibrating screen assembly (4); the bottom of the vibrating screen assembly (4) is provided with a feeding hopper (14) for collecting fine particulate materials passing through the lower screen; the side of the frame (1) is provided with a controller (6) for controlling the coordinated operation of the vibrating feeding assembly (2), the roller pressing assembly (3), the vibrating screen assembly (4) and the pulse jet blowing assembly (5).

2. The vibrating screen pulse air blowing dynamic self-cleaning anti-clogging device according to claim 1, characterized in that, The vibrating feeding assembly (2) includes a feeding trough (21) inclined at the top of the frame (1), the inclination angle of the feeding trough (21) being 5°~15°; the bottom of the feeding trough (21) is connected to the top of the frame (1) through a support spring (22) and a support guide column (23), wherein the support spring (22) restricts the feeding trough (21) to vibrate only in the vertical direction, and the support guide column (23) passes through the through hole at the bottom of the feeding trough (21) and slides in cooperation with the feeding trough (21); a feeding vibration motor (24) is fixed at the center of the bottom of the feeding trough (21) to generate vibration driving force; the inner wall of the feeding trough (21) is provided with a guide protrusion (211) with an arc cross-section along the length direction to assist in the uniform distribution of materials and reduce accumulation.

3. The vibrating screen pulse air blowing dynamic self-cleaning anti-clogging device according to claim 2, characterized in that, The roller pressing assembly (3) includes an upper guide roller (31) and a lower guide roller (32) arranged in parallel. The gap between the roller surfaces of the upper guide roller (31) and the lower guide roller (32) is flush with the discharge end port of the feed trough (21). The roller pressing assembly (3) also includes a crushing roller group (33), a drive gear group (34), and a driven gear group (35). The crushing roller group (33) includes a first crushing roller (331) and a second crushing roller (332) rotating in opposite directions. The roller surface of the crushing roller group (33) forms a crushing gap with the roller surfaces of the upper guide roller (31) and the lower guide roller (32). The bottom of the crushing gap is flush with the discharge end port of the feed trough (21). The top opening of the guide trough (11) is flush with the top opening; the roller surfaces of the first crushing roller (331) and the second crushing roller (332) are both provided with crushing teeth (333), and they are driven to rotate in opposite directions by the meshing of the drive gear set (34) and the driven gear set (35); the drive side of the second crushing roller (332) is also provided with a drive pulley (36) and a roller pressure drive motor (37), and is connected to the output shaft belt of the roller pressure drive motor (37); the driven gear set (35) is located at the ends of the upper guide roller (31) and the lower guide roller (32), and meshes with the drive gear set (34) to achieve synchronous transmission with the crushing roller set (33).

4. The vibrating screen pulse air blowing dynamic self-cleaning anti-clogging device according to claim 1, characterized in that, The vibrating screening assembly (4) includes a screen frame (41), inside which a double-layer screen (42) is fixed. The double-layer screen (42) includes an upper coarse screen (421) and a lower fine screen (422). The screen aperture of the upper coarse screen (421) is 2~5mm, and the screen aperture of the lower fine screen (422) is 0.5~2mm. The bottom of the screen frame (41) is connected to the frame (1) through an elastic support seat (44). The screen frame (41) is fixed with a screening vibration motor (43) on both sides to generate simple harmonic vibration in the horizontal direction; the end of the upper coarse screen (421) extends to the top of the inlet of the first slag discharge channel (12), and the end of the lower fine screen (422) extends to the top of the inlet of the second slag discharge channel (13); the lower fine screen (422) is provided with a feeding hopper (14) below it, and the bottom of the feeding hopper (14) is provided with a discharge port (141).

5. The vibrating screen pulse air blowing dynamic self-cleaning anti-clogging device according to claim 4, characterized in that, The pulse jet assembly (5) includes an air source (51), a pulse valve (52), and a jet pipe (53); the air source (51) is connected to the air inlet of the pulse valve (52) through an air pipe, and the air outlet of the pulse valve (52) is sealed and connected to the end of the jet pipe (53); the jet pipe (53) is horizontally arranged above the screen frame (41) along the width direction of the vibrating screen assembly (4), and the bottom of the jet pipe (53) is provided with a plurality of nozzles (531) facing the screen.

6. The vibrating screen pulse air blowing dynamic self-cleaning anti-clogging device according to claim 3, characterized in that, The top opening of the feed chute (11) is flush with the bottom of the crushing gap, and is used to guide the crushed material onto the screen of the vibrating screen assembly (4).

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