Anti-blocking drum screen

Abstract

The utility model discloses an anti-blocking drum screen, which relates to the technical field of material screening equipment and comprises a drum screen, a frame 13, a drum screen power component, a drum screen feed end bearing component, a drum screen discharge end bearing component, a dustproof sealing cover 9, a feed hopper 10 and a discharge component. The cleaning and blockage blowing device comprises more than one high-pressure fan 16, a high-pressure air pipe 15, a mounting plate 17, more than two mounting suites and more than two rotary spray head brushes 7; the mounting kit comprises a mounting screw rod 18 and a high-pressure air pipe sleeve 19; the screen has the characteristics of cleaning the screen surface, preventing the screen from being blocked, prolonging the service life of the screen, reducing the use cost and the like, and is suitable for grading stones in a stone yard, separating soil from stone powder, separating sand and stones in a sand yard, separating lump coal from pulverized coal in the coal industry, grading materials in the chemical industry and the mineral separation industry and separating powdery materials.

Description

Technical Field

[0001] The utility model relates to the technical field of material separation equipment, in particular to an anti-blocking drum screen. Background Art

[0002] In the prior art, a circular drum screen is usually composed of a motor, a reducer, a drum device, a frame, an inlet and outlet, a support wheel and a dustproof sealing cover. The drum device is installed on the frame. The motor is connected to the drum device through a coupling via a reducer to drive the drum device to rotate around its axis. When the material enters the drum device from the feed hopper, the material on the screen surface flips and rolls due to the tilt and rotation of the drum device. The material smaller than the sieve hole (screen under) is discharged through the screen mesh on the outer circle of the drum and falls into the fine discharge hopper, and the material larger than the sieve hole (screen over) is discharged from the coarse discharge hopper at the end of the drum. It is mainly suitable for grading large and small stones in stone quarries, and separating soil and stone powder; for sand and stone separation in sand and gravel fields; for separation of lump coal and coal powder in the coal industry; for grading large and small blocks and separating powdered substances in the chemical industry and mineral processing industry. Wet separation with water usually uses high-pressure water to spray the screen surface to prevent the screen from being blocked, while dry separation uses a whipping device. A whipping device with several belts is installed outside the drum of the drum screen in parallel with the drum. The purpose of preventing the screen from being blocked is achieved by continuously whipping the drum screen. However, when screening materials below 2mm or even smaller, the whipping device is easy to damage the screen due to the fine screen. At the same time, due to the fine screen, the screen is more likely to be blocked when the whipping is insufficient.

[0003] The "running fountain type drum screen anti-blocking device" disclosed in a Chinese patent (patent application number 201120009659.5) comprises: an air compressor (1), a solenoid valve (2), a controller (3), a plurality of nozzles (4) and a main air supply pipe (5), wherein the air compressor (1) is connected to the main air supply pipe (5), a plurality of solenoid valves (2) are mounted on the main air supply pipe (5), each solenoid valve (2) is connected to a plurality of nozzles (4), and the controller (3) is connected to each solenoid valve (2) through an information line. The utility model utilizes the running fountain principle of the fountain to supply air to each nozzle respectively to overcome the disadvantages of other methods, that is, the air pipe does not move at all and can achieve the purpose of cleaning at all positions within a certain period of time. The pressure and flow rate of the air inlet can be adjusted according to the humidity, viscosity, size of the screening amount and other conditions of the screened material to achieve the best cleaning effect.

[0004] Another Chinese patent (patent application number is 201821883917.0) discloses a "drum screen air pressure cleaning device", which includes a wind knife assembly (1), a connecting angle steel (2), a left universal adjustment mechanical bracket (3), a right universal adjustment mechanical bracket (4) and a base (5); the left universal adjustment mechanical bracket (3) and the right universal adjustment mechanical bracket (4) are symmetrically arranged, and both include a first slide bar (6.1), a second slide bar (6.2), a first rotating seat (6.3), a second rotating seat (6.4), a screw (6.5), a first nut (6.6) and a second nut (6.7). The advantages are: the strong air pressure of compressed air is used to clean the screen holes of the drum screen blocked by materials, and the screen holes of the drum screen have the advantage of high cleaning efficiency; in addition, the vertical height, horizontal distance and inclination angle of the equipment relative to the drum screen can be flexibly and conveniently adjusted, which has the advantages of flexible and convenient use; it also has the advantages of easy disassembly and maintenance, and convenient assembly between the various components.

[0005] The Chinese patent (patent application number 201921027261.7) discloses an "anti-caking device for a fertilizer screening machine, which includes a primary cleaning mechanism arranged below the inner crossbeam of the screening machine and a deep cleaning mechanism arranged on one side of the primary cleaning mechanism; the primary cleaning mechanism includes an arc-shaped brush parallel to the axis of the drum screen and a plurality of mounting assemblies; the arc-shaped brush is fixed to the lower end of the mounting assembly, and the bristle end of the arc-shaped brush is in contact with the outer surface of the drum screen; the upper end of the mounting assembly is fixed to the bottom of the crossbeam; the deep cleaning mechanism includes an air knife, a bracket, and a motion mechanism for moving the air knife in a direction parallel to the axis of the drum screen; the air knife is fixed to the motion mechanism through the bracket, and the air knife is parallel to the axis of the drum screen. The utility model can further improve the cleaning effect of the drum screen, better prevent sticky materials from consolidating on the drum screen, thereby improving the screening efficiency of the screening machine, improving the screening effect, and reducing the workload of workers; in addition, the utility model can also extend the service life of the arc-shaped brush and save the use cost.

[0006] The "self-cleaning drum vibrating screen" disclosed in a Chinese patent (patent application number is 202320716466.6) includes a fixed outer shell and a drum screen rotatably arranged in the outer shell, the feed end of the drum screen is connected to a rotary drive device, and the discharge end of the drum screen is connected to a vertical vibration device. A cleaning wind knife extending axially for blowing air to the drum screen is provided on the outer shell, and the cleaning wind knife is connected to an air supply device; a vacuum chamber is provided in the lower part of the annular space between the drum screen and the outer shell, and the vacuum chamber is connected to a vacuum pumping device; when working, particles that are stuck in the filter holes of the drum screen are separated from the filter screen and fall into the drum screen under the action of the high-speed airflow blown by the cleaning wind knife, thereby completing the automatic cleaning of the filter screen to prevent blockage, with good solid-liquid separation effect and high production efficiency. Summary of the invention

[0007] In view of the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a drum screen which can clean the screen surface and prevent the screen from being blocked, and can also extend the service life of the screen and reduce the use cost.

[0008] In order to solve the above technical problems, the technical solution adopted by the utility model is to design an anti-blocking drum screen: including a drum screen, a frame 13, a drum screen power assembly, a drum screen feed end supporting assembly, a drum screen discharge end supporting assembly, a dustproof sealing cover 9 and a feed hopper 10 and a discharge assembly; the drum screen is arranged with the left side higher and the right side lower, and the drum screen feed end supporting assembly and the drum screen discharge end supporting assembly are respectively arranged at the left and right ends of the frame 13, and the drum screen power assembly is arranged at the right end of the drum screen discharge end supporting assembly and is connected to the drum screen discharge end; the feed hopper 10 is arranged at the feed port of the drum screen, and the discharge assembly is arranged at the lower part of the frame 13 below the drum screen; the dustproof sealing cover 9 is arranged on the frame 13 On, its inner cavity is covered with a drum screen; it also includes a cleaning and blowing device, which includes one or more high-pressure fans 16, high-pressure air ducts 15, mounting plates 17, more than two mounting kits and more than two rotating nozzle brushes 7; the mounting kit includes a mounting screw 18 and a high-pressure air duct sleeve 19; the high-pressure fan 16 is arranged at the end of the drum screen, and the mounting plate 17 is arranged at the upper oblique part of the inner cavity of the dust-proof sealing cover 9; one end of the high-pressure air duct 15 is connected to the high-pressure fan 16, and the other end passes through the dust-proof sealing cover 9 and the lower part of the mounting plate 17, which is provided with a screw hole for mounting the rotating nozzle brush 7; the high-pressure air duct sleeve 19 is covered with the high-pressure air duct 15, and is fixed to the mounting plate 17 by the mounting screw 18 thereon.

[0009] The rotary nozzle brush 7 comprises a joint 20, a high-pressure air flow introduction spiral tube 21, a locking nut 22, a round outer shell cylinder 23 with large and small heads, a conical inner shell cylinder 27, an upper end bearing 25, an inner conical sleeve 26 and more than two sets of brush head components; the upper end of the joint 20 is screwed into the screw hole of the high-pressure air duct 15, and the lower end thereof is sleeved with the upper end of the high-pressure air flow introduction spiral tube 21; the middle part of the high-pressure air flow introduction spiral tube 21 is screwed with the locking nut 22, and then screwed The inner shell 27 is inserted into the screw hole at the upper end of the outer shell cylinder 23; the small end of the inner shell cylinder 27 is inserted into the inner cavity of the outer shell cylinder 23 and supported by the upper end bearing 25; the inner conical sleeve 26 is inserted into the inner cavity of the inner shell cylinder 27, and more than two spiral wind grooves 28 are evenly distributed on its outer cone surface; the brush head components are evenly distributed at the large end of the inner shell cylinder 27; after the high-pressure airflow introduction spiral tube 21 is screwed into the small end of the outer shell cylinder 23, its inner hole is connected to the spiral wind groove 28.

[0010] The brush head assembly includes a brush fixing column 32, brush filaments 33 and a brush fixing ring 31. The brush fixing column 32 is arranged at the large end of the inner shell tube 27, the ends of the brush filaments 33 surround the brush fixing column 32, and the brush fixing ring 31 is sleeved on the periphery of the brush filaments 33 surrounding the brush fixing column 32.

[0011] The outer circular shell cylinder 23 is composed of a lower large cylinder at the bottom, a middle conical cylinder in the middle, a middle upper cylinder in the middle upper part, an upper small cylinder in the upper part and an upper small round end at the upper end, from the large end to the small end. A screw hole matching the high-pressure airflow introduction spiral tube 21 is opened in the middle of the upper small round end.

[0012] The inner shell tube 27 is composed of two parts from the large end to the small end, including a large conical tube at the lower, middle and upper middle parts, and an outer column inner cone tube at the upper part. The inner cavities of the two parts are conical holes, and a downward concave hole is opened on the upper surface of the outer column inner cone tube.

[0013] It also includes an upper snap ring 24; in the middle of the outer cylindrical surface of the outer cylindrical inner cone of the inner shell tube 27, a radial upper snap ring groove for installing the upper snap ring 24 is provided, and the upper snap ring groove corresponds to the intersection of the middle upper cylinder in the upper part of the circular outer shell tube 23 and the upper small cylinder in the upper part.

[0014] It also includes a lower end bearing 29 and a lower retaining ring 30; an outer cylindrical platform with the lower end bearing 29 mounted thereon is provided in the middle of the outer conical surface of the large conical cylinder of the inner shell cylinder 27, and a radial lower retaining ring groove for mounting the lower retaining ring 30 is provided on the inner wall of the lower large cylinder of the outer shell cylinder 23 corresponding to the outer cylindrical platform.

[0015] The supporting assembly at the feed end of the drum screen includes a pair of supporting wheels 11 at the feed end of the drum screen and two pairs of supporting wheel bearing seats 12. The two pairs of supporting wheel bearing seats 12 are respectively arranged at the front and rear parts of the left end of the frame 13. The two ends of the supporting wheel 11 at the feed end of the drum screen are inserted into the supporting wheel bearing seats 12, and the feed end of the drum screen is supported on the supporting wheel 11 at the feed end of the drum screen.

[0016] The drum screen comprises a drum 5 and a screen 6 laid on the outer cylindrical surface thereof.

[0017] The discharging assembly comprises a fine discharging hopper 8 and a coarse discharging hopper 4. The fine discharging hopper 8 is placed at the lower part of the drum screen, and the coarse discharging hopper 4 is placed at the lower part of the discharging end of the drum screen.

[0018] The number of the brush head assemblies is two, three, four or more groups, and the optimal number is three or four groups.

[0019] The number of the spiral air grooves 28 is two, three, four or more, and the optimal number is three or four.

[0020] The brush filaments 33 are steel brush filaments.

[0021] The anti-blocking drum screen of the utility model is provided with a row of rotating nozzle brushes obliquely above the drum screen, and a plurality of groups of brush head assemblies and a plurality of spiral wind grooves are also provided at the end of the rotating nozzle brush. When the high-pressure airflow is ejected from the spiral wind grooves, it will push the end to rotate, forming a plurality of rotating wind knives, which can blow away the materials blocked on the screen. At the same time, the rotating brush head assembly will also clean away the materials blocked on the screen that cannot be blown away, thereby avoiding the phenomenon that the screen is easily damaged by the traditional whipping and clearing method, so the service life of the screen can be extended and the use cost of the drum screen can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a main schematic diagram of the utility model;

[0023] Figure 2 It is a right-side cross-sectional top view of the utility model along the AA axis;

[0024] Figure 3 It is a partial enlarged schematic diagram of K of the utility model;

[0025] Figure 4 It is a partial enlarged schematic diagram of S of the utility model;

[0026] Figure 5 It is a partial enlarged schematic diagram of H of the utility model.

[0027] In the figure:

[0028] 1 is a reduction motor, 2 is a coupling, 3 is a drum screen discharge bearing seat, 4 is a coarse discharge hopper, 5 is a drum, 6 is a screen, 7 is a rotary nozzle brush, 8 is a fine discharge hopper, 9 is a dustproof sealing cover, 10 is a feed hopper, 11 is a drum screen feed end supporting wheel, 12 is a supporting wheel bearing seat, 13 is a frame, 14 is a frame foot, 15 is a high-pressure air duct, 16 is a high-pressure fan, 17 is a mounting plate, 18 is a mounting screw, 19 is a high-pressure air duct sleeve, 20 is a joint, 21 is a high-pressure air flow introduction spiral tube, 22 is a locking nut, 23 is a circular outer shell, 24 is an upper retaining ring, 25 is an upper end bearing, 26 is an inner conical sleeve, 27 is an inner shell, 28 is a spiral wind groove, 29 is a lower end bearing, 30 is a lower retaining ring, 31 is a brush wire fixing ring, 32 is a brush wire fixing column, and 33 is a brush wire. DETAILED DESCRIPTION

[0029] The following is a further description of the present invention in conjunction with the accompanying drawings and embodiments. The following description is in the form of examples, but the protection scope of the present invention should not be limited thereto.

[0030] Description of the upper and lower positions in this specification and its drawings:

[0031] Attached Figure 1 The up-down, left-right, and front-back directions are the actual up-down, left-right, and front-back directions respectively;

[0032] Attached Figure 2 The up and down in the are the actual up and down directions, the left and right are the actual front and back directions, and the front and back are the actual right and left directions;

[0033] Attached Figure 3-5 (Since the product is a rotating body, the front, back, left and right directions do not need to be explained) The upper left is the actual upper side, and the lower right is the actual lower side.

[0034] Embodiment 1:

[0035] The anti-blocking drum screen of this embodiment is composed of a drum screen, a frame 13, a drum screen power assembly, a drum screen feed end support assembly, a drum screen discharge end support assembly, a dustproof sealing cover 9, a feed hopper 10 and a discharge assembly and a cleaning and blowing device.

[0036] The drum screen is composed of a drum 5 and a screen 6. The drum 5 is divided into four parts from left to right, namely, a feed end, a cylinder, a discharge end and a tail end. The feed end of the drum 5 is a cylinder (equivalent to a shaft neck), which is used to support the left end of the drum 5 (i.e., the feed end). The cylinder of the drum 5 is cage-shaped (i.e., its outer cylindrical surface is composed of multiple axial bars and multiple circular rings), and a screen 6 is laid on its surface. The cylinder of the drum 5 is its main part, which is used to screen out fine materials that meet the particle size requirements, and its length accounts for most of the total length of the drum 5. The discharge end of the drum 5 is a truncated cone-shaped cage composed of more than three inclined rods and a small disc at the tail. The tail end of the drum 5 is an axial end. The drum screen is tilted with the left side higher and the right side lower (i.e., the feed end is high and the discharge end is low).

[0037] The frame 13 is a rectangular frame, and frame feet 14 are arranged at the lower part of the left and right sides thereof for raising the position to reserve space for the discharging assembly and the screened material.

[0038] The drum screen power assembly is composed of a reduction motor 1 and a coupling 2. The reduction motor 1 is arranged at the left end of the frame 13, and one end of the coupling 2 is sleeved on the output shaft of the reduction motor 1.

[0039] The supporting assembly at the feed end of the drum screen is composed of a pair of supporting wheels 11 at the feed end of the drum screen and two pairs of supporting wheel bearing seats 12. The two pairs of supporting wheel bearing seats 12 are respectively arranged at the front and rear parts of the left part of the frame 13. The two ends (i.e., the shaft ends) of the supporting wheels 11 at the feed end of the drum screen are installed in the supporting wheel bearing seats 12, and the feed end of the drum 5 is supported on the two supporting wheels 11 at the feed end of the drum screen.

[0040] The drum screen discharge end supporting assembly is a drum screen discharge bearing seat 3 arranged in the middle of the left end of the frame 13. After the tail end (i.e., the shaft end) of the drum 5 passes through the drum screen discharge bearing seat 3, its protruding end is connected to the other end of the coupling 2.

[0041] The dustproof sealing cover 9 is a rectangular shell, with a circular hole on the left side for passing through the feed end of the drum 5, and a circular hole on the right side for passing through the tail end of the drum 5. The bottom is empty for connecting the upper end of the discharge assembly; the inner cavity of the dustproof sealing cover 9 is equipped with a drum screen.

[0042] The feed hopper 10 is in the shape of a three-sided trough and is disposed at the feed end of the drum 5 .

[0043] The discharging assembly is arranged at the lower part of the frame 13, and is composed of a fine discharging hopper 8 and a coarse discharging hopper 4; wherein: the fine discharging hopper 8 is placed at the lower part of the cylinder body of the drum 5, and is used to receive fine materials that meet the particle size requirements screened out by the cylinder body of the drum 5; the coarse discharging hopper 4 is placed at the lower part of the discharging end of the drum 5, and is used to receive coarse materials with larger particle sizes.

[0044] The cleaning and blowing device is composed of one or more high-pressure fans 16 (usually one or two depending on the length of the drum screen. For a longer one, three or even four or more units can be set. In this case, two units are used, which are installed symmetrically on the left and right), a high-pressure air duct 15, a mounting plate 17, two or more mounting kits (usually one is set for every 4-6 cleaning and blowing components), and two or more rotating nozzle brushes 7 (arranged in a row, and the specific number is determined according to the length of the drum screen).

[0045] The mounting plate 17 is inclined and arranged parallel to the outer cylindrical surface of the drum 5 at the front or rear upper corner of the inner cavity of the dustproof sealing cover 9 (see the attached Figure 2 shown).

[0046] The two high pressure fans 16 of this example are respectively arranged at the left and right ends of the drum screen (see attached Figure 1 As shown), one end of the high-pressure air duct 15 is connected to the air outlet end of the high-pressure fan 16, and the other end passes through the inner cavity of the dustproof sealing cover 9 and the lower part of the mounting plate 17 through the feed end of the drum 5 and the discharge end of the drum 5 respectively.

[0047] On the high pressure air duct 15, a plurality of screw holes are provided at intervals slightly larger than the size of the cleaning and blowing plugging assembly. The axis of the screw holes should be on the line connecting the axis of the high pressure air duct 15 and the axis of the drum 5 (see attached Figure 2 shown).

[0048] The installation kit is composed of a mounting screw 18 and a high-pressure air duct sleeve 19. The mounting screw 18 is arranged on the outer cylindrical surface of the high-pressure air duct sleeve 19, and the two are integrated. The axis of the mounting screw 18 points to the axis center of the high-pressure air duct sleeve 19; the high-pressure air duct sleeve 19 is mounted on the high-pressure air duct 15, and the mounting screw 18 thereon is fixed to the mounting plate 17.

[0049] The rotary nozzle brush 7 is composed of a joint 20, a high-pressure air flow introduction spiral tube 21, a locking nut 22, a round outer shell cylinder 23 with large and small heads, a conical inner shell cylinder 27, an upper end bearing 25, a lower end bearing 29, an inner cone sleeve 26 and more than two sets of brush head components.

[0050] The joint 20 is a hollow joint with a small upper portion and a large lower portion. The upper portion is provided with an external thread, and the lower portion is provided with an internal thread (forming a screw hole). The upper portion is screwed into the screw hole on the high-pressure air duct 15 .

[0051] The high-pressure airflow introduction spiral tube 21 is a vent pipe with a through hole in the middle and threads on the outer cylindrical surface; the upper end of the high-pressure airflow introduction spiral tube 21 is screwed into the screw hole at the lower part of the joint 20.

[0052] The outer shell cylinder 23 is composed of the lower large cylinder at the bottom, the middle conical cylinder at the middle, the middle upper cylinder at the middle upper part, the upper small cylinder at the upper part and the upper small round end at the upper end. A screw hole matching the high-pressure airflow introduction spiral tube 21 is provided in the middle of the upper small round end. The lower end of the high-pressure airflow introduction spiral tube 21 is screwed into the screw hole. At the same time, a locking nut 22 is also mounted on the high-pressure airflow introduction spiral tube 21 between the upper small round end and the joint 20. A lower end bearing 29 is installed in the lower large cylinder at the connection with the middle conical cylinder, and a radial lower snap ring groove is provided on the inner wall of the lower large cylinder corresponding to the lower end of the lower end bearing 29. The lower snap ring 30 is installed in the lower snap ring groove, which mainly plays a role in positioning the outer shell cylinder 23 upward. An upper end bearing 25 (see attached) is installed at the inner step formed at the connection between the middle upper cylinder and the upper small cylinder. Figure 3 shown).

[0053] The small end of the inner shell tube 27 is inserted into the inner cavity of the outer shell tube 23.

[0054] The inner shell 27 is composed of two parts, namely, a large conical cylinder including a lower part, a middle part and a middle upper part, and an outer column inner cone cylinder (i.e., the outer surface is cylindrical and the inner hole is conical) from the large end to the small end. The inner cavities of these two parts are continuous conical holes. At the same time, a downward concave hole is provided on the upper surface of the outer column inner cone cylinder. After the lower end of the high-pressure airflow is introduced into the screw hole provided in the middle of the upper small end, it also extends into the concave hole. The inner ring of the upper end bearing 25 is sleeved on the outer cylindrical surface of the outer column inner cone cylinder at the connection part with the large conical cylinder, and a radial upper snap ring groove is provided on the outer cylindrical surface corresponding to the upper end surface of the upper end bearing 25. The upper snap ring 24 is installed in the upper snap ring groove, which mainly plays a role in positioning the inner shell 27 downward. In the middle of the outer conical surface of the large cone, there is also a section of outer cylindrical platform (that is, the outer conical surface of this section becomes an outer cylindrical platform) for passing the inner ring of the lower end bearing 29 (see attached Figure 3 shown).

[0055] The inner conical sleeve 26 is a conical sleeve whose cone tip is not penetrated, and has two or more (it can be two or three or four or more, preferably three or four) spiral wind grooves 28 (whose spiral angle is usually set at 2-10°, and its optimized spiral angle is 5°) evenly distributed on its outer cone surface. The sum of the cross-sectional areas of all the spiral wind grooves 28 should be smaller than the area of ​​the through hole for introducing the high-pressure airflow into the spiral tube 21, so as to avoid excessively reducing the wind pressure at the outlet of the spiral wind grooves 28; the inner conical sleeve 26 is installed in the inner cavity of the inner shell tube 27 and is connected to the inner shell tube 27 as a whole (screws are used to fix the non-spiral wind grooves 28).

[0056] The selection of the high-pressure blower 16 needs to ensure that the pressure at the outlet end of the spiral wind groove 28 of the rotating nozzle brush 7 reaches: 0.4-0.5MPa, and the flow rate reaches: 100-110NL / min.

[0057] The brush head assembly (which can be two, three, four, five or more groups, and four groups are used in this example) is composed of a brush wire fixing column 32, brush wires 33 and a brush wire fixing ring 31. The brush wire fixing column 32 is arranged at the large end of the inner shell 27, and the ends of the brush wires 33 (usually ordinary steel wires or stainless steel wires or filaments of other materials) surround the brush wire fixing column 32. The brush wire fixing ring 31 (the brush wire fixing ring 31 is a tightening device to prevent the brush wires 33 from loosening) is sleeved on the periphery of the brush wires 33 surrounding the brush wire fixing column 32. During installation, the lower end of the brush wire 33 is slightly in contact with the screen 6 on the outer cylindrical surface of the drum 5 so that it can clean the materials adhering to the holes of the screen 6.

[0058] When in use, start the reduction motor 1 and the high-pressure fan 16 respectively. At this time:

[0059] On the one hand, the reduction motor 1 drives the drum 5 to rotate through the coupling 2, and the material to be screened enters the inner cavity of the drum 5 from the feed hopper 10. Since the feed end of the drum 5 is high and the discharge end is low, as the drum 5 rotates, the material therein will gradually roll from the feed end of the drum 5 to the discharge end of the drum 5. During this rolling process, fine materials with a particle size smaller than the aperture of the screen 6 will fall through the sieve holes of the screen 6 into the fine discharge hopper 8 below, and then fall to the ground or fall into the conveyor belt below it to be transported away; coarse materials with a particle size larger than the aperture of the screen 6 will continue to roll until they fall from the discharge end of the drum 5 to the coarse discharge hopper 4, and then fall to the ground or fall into the conveyor belt below it to be transported away.

[0060] On the other hand, the high-pressure airflow introduced by the high-pressure airflow introduction spiral tube 21 is divided into each spiral wind groove 28 in the concave hole on the inner cone of the outer column, and is ejected through the outlet end of the spiral wind groove 28. Since the total cross-sectional area of ​​all the spiral wind grooves 28 is smaller than the area of ​​the through hole of the high-pressure airflow introduction spiral tube 21, the airflow ejected from the outlet end of the spiral wind groove 28 has a relatively large pressure and speed, so it can effectively clean the workpiece; at the same time, since the outlet of the spiral wind groove 28 has a spiral angle, when the high-pressure airflow is ejected from the outlet of the spiral wind groove 28, a thrust will be generated, pushing the inner shell tube 27 and the inner cone sleeve 26 to reverse together, and rotating with the brush head assembly, and the end of the rotating brush filament 33 will also clean the surface of the workpiece, thereby further improving the cleaning effect.

[0061] Since the through hole of the spiral tube 21 through which the high-pressure airflow is introduced and the cone tip of the inner conical sleeve 26 are not completely closed, a small amount of high-pressure airflow flows into the gap between the inner shell tube 27 and the outer shell tube 23 through the concave hole on the inner cone tube of the outer column during diversion, and further flows through the upper end bearing 25 and the lower end bearing 29, and finally diffuses from the space between the large end of the outer shell tube 23 and the large end of the inner shell tube 27; at the same time, a positive pressure state is also formed, thereby preventing dust and water vapor from entering the lower end bearing 29 and the upper end bearing 25 through the space between the large end of the outer shell tube 23 and the large end of the inner shell tube 27, thereby damaging the lower end bearing 29 and the upper end bearing 25.

[0062] The anti-blocking drum screen of the utility model is suitable for stone grading, soil and stone powder separation in stone quarries, sand and stone separation in sandstone quarries, lump coal and coal powder separation in the coal industry, and material grading and powder material separation in the chemical industry and mineral processing industry.

Claims

1. A blockage-proof drum screen, comprising a drum screen, a frame (13), a drum screen power assembly, a drum screen feed end support assembly, a drum screen discharge end support assembly, a dustproof sealing cover (9), a feed hopper (10) and a discharge assembly; the drum screen is arranged with the left side higher and the right side lower, the drum screen feed end support assembly and the drum screen discharge end support assembly are arranged at the left and right ends of the frame (13), respectively, the drum screen power assembly is arranged at the right end of the drum screen discharge end support assembly and is connected to the drum screen discharge end; the feed hopper (10) is arranged at the feed port of the drum screen, and the discharge assembly is arranged at the lower part of the frame (13) below the drum screen; the dustproof sealing cover (9) is arranged on the frame (13), and the inner cavity of the dustproof sealing cover (9) is sleeved with the drum screen; characterized in that: The invention also comprises a cleaning and blowing device, which comprises one or more high-pressure blowers (16), a high-pressure air duct (15), a mounting plate (17), two or more mounting kits and two or more rotating nozzle brushes (7); the mounting kit comprises a mounting screw (18) and a high-pressure blower sleeve (19); the high-pressure blower (16) is arranged at the end of the drum screen, and the mounting plate (17) is arranged at the upper oblique part of the inner cavity of the dustproof sealing cover (9); one end of the high-pressure blower (15) is connected to the high-pressure blower (16), and the other end is inserted into the dustproof sealing cover (9) and the lower part of the mounting plate (17), on which a screw hole for mounting the rotating nozzle brush (7) is provided; the high-pressure blower sleeve (19) is sleeved on the high-pressure blower (15) and fixed to the mounting plate (17) by the mounting screw (18) thereon.

2. The anti-blocking drum screen according to claim 1, characterized in that: The rotary nozzle brush (7) comprises a joint (20), a high-pressure air flow introduction spiral tube (21), a locking nut (22), a large and small head-shaped round outer shell cylinder (23), a conical inner shell cylinder (27), an upper end bearing (25), an inner conical sleeve (26) and more than two sets of brush head components; the upper end of the joint (20) is screwed into the screw hole of the high-pressure air duct (15), and the lower end thereof is sleeved on the upper end of the high-pressure air flow introduction spiral tube (21); after the locking nut (22) is screwed on the middle part of the high-pressure air flow introduction spiral tube (21), The inner shell (27) is screwed into the screw hole at the upper end of the outer shell cylinder (23); the small end of the inner shell cylinder (27) is inserted into the inner cavity of the outer shell cylinder (23) and supported by the upper end bearing (25); the inner cone sleeve (26) is inserted into the inner cavity of the inner shell cylinder (27), and more than two spiral wind grooves (28) are evenly distributed on its outer cone surface; the brush head components are evenly distributed at the large end of the inner shell cylinder (27); after the high-pressure air flow introduction spiral tube (21) is screwed into the small end of the outer shell cylinder (23), its inner hole is connected to the spiral wind groove (28).

3. The anti-blocking drum screen according to claim 2, characterized in that: The brush head assembly comprises a brush filament fixing column (32), brush filaments (33) and a brush filament fixing ring (31); the brush filament fixing column (32) is arranged at the large end of the inner shell tube (27); the ends of the brush filaments (33) surround the brush filament fixing column (32); and the brush filament fixing ring (31) is sleeved on the periphery of the brush filaments (33) surrounding the brush filament fixing column (32).

4. The anti-blocking drum screen according to claim 2, characterized in that: The outer cylindrical shell (23) comprises, from the large end to the small end, a lower large cylinder at the bottom, a middle conical cylinder at the middle, a middle upper cylinder at the middle upper part, an upper small cylinder at the upper part and an upper small round end at the upper end, and a screw hole matching the high-pressure airflow introduction spiral tube (21) is provided in the middle of the upper small round end.

5. The anti-blocking drum screen according to claim 2, characterized in that: The inner shell cylinder (27) is composed of two parts, including a large conical cylinder including a lower part, a middle part and a middle upper part, and an outer column inner conical cylinder at the upper part, from the large end to the small end. The inner cavities of the two parts are conical holes, and a downward concave hole is opened on the upper surface of the outer column inner conical cylinder.

6. The anti-blocking drum screen according to claim 2, characterized in that: It also includes an upper snap ring (24); a radial upper snap ring groove for mounting the upper snap ring (24) is provided in the middle of the outer cylindrical surface of the outer cylindrical inner cone of the inner shell cylinder (27); the upper snap ring groove corresponds to the junction of the middle upper cylinder and the upper small cylinder in the middle upper part of the outer shell cylinder (23).

7. The anti-blocking drum screen according to claim 2, characterized in that: It also includes a lower end bearing (29) and a lower retaining ring (30); an outer cylindrical platform for fitting the lower end bearing (29) is provided in the middle of the outer conical surface of the large conical cylinder of the inner shell cylinder (27); a radial lower retaining ring groove for mounting the lower retaining ring (30) is provided on the inner wall of the lower large cylinder of the outer shell cylinder (23) corresponding to the outer cylindrical platform.

8. The anti-blocking drum screen according to claim 1, characterized in that: The drum screen feed end supporting assembly comprises a pair of drum screen feed end supporting wheels (11) and two pairs of supporting wheel bearing seats (12), wherein the two pairs of supporting wheel bearing seats (12) are respectively arranged at the front and rear parts of the left end of the frame (13), the two ends of the drum screen feed end supporting wheels (11) are inserted into the supporting wheel bearing seats (12), and the drum screen feed end is supported on the drum screen feed end supporting wheels (11).

9. The anti-blocking drum screen according to claim 1, characterized in that: The drum screen comprises a drum (5) and a screen (6) laid on the outer cylindrical surface of the drum.

10. The anti-blocking drum screen according to claim 1, characterized in that: The discharge assembly comprises a fine discharge hopper (8) and a coarse discharge hopper (4), wherein the fine discharge hopper (8) is arranged at the lower part of the drum screen, and the coarse discharge hopper (4) is arranged at the lower part of the discharge end of the drum screen.

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