Sealed self-cleaning drum screen

Abstract

The utility model discloses a sealed self-cleaning type drum screen which comprises a shell formed by connecting an upper shell and a lower shell, a feeding port is formed in the shell, a driving motor is arranged on one side of the shell, an output shaft of the driving motor is connected with a speed reducer, the speed reducer is connected with a rotating shaft, and the rotating shaft penetrates into the shell and is connected with a drum screen in the shell. A sealing bearing is arranged at the joint of the shell and the rotating shaft; a screen underflow discharging port is formed in the bottom of the shell relative to the lower portion of the cylinder screen, an oversize product discharging port is formed in the bottom of the shell relative to the front end of the cylinder screen, and a cleaning mechanism used for cleaning screen holes of the cylinder screen is further arranged on the top of the shell. The drum screen solves the problem that a drum screen in the prior art is difficult to provide a negative pressure environment for screening operation.

Description

Technical Field

[0001] The utility model belongs to the technical field of screening equipment, and in particular relates to a sealed self-cleaning cylindrical screen. Background Art

[0002] Drum screen is a commonly used solid material separation equipment. Its main purpose is to screen materials according to particle size. It usually consists of one or more parallel rotating cylinders with sieve holes on the surface. The material passes through the sieve holes through the rotating motion of the cylinder under the action of gravity and centrifugal force and is divided into different particle size grades.

[0003] At present, drum screens are widely used in various industries. Depending on the production conditions, some processes require screening materials under a negative pressure environment, such as discharging undersize or oversize materials from the system through screening under a negative pressure environment, or the graded materials need to be pneumatically lifted to other silos, and the screen is in a negative pressure environment. However, the drum screens in most industries are used in open-air environments and cannot be used in negative pressure environments. These drum screens usually do not consider the problem of sealing, resulting in the inability to meet the requirements of screening materials inside the system under a negative pressure environment. For example, the prior art with announcement number CN221413857U discloses a drum screen with openings at both ends on the top of the frame, and the feed port of the drum screen faces upwards and the discharge port faces downwards. It can be seen from this that the drum screen of the prior art is not sealed at both ends, and screening operations under a negative pressure environment cannot be achieved.

[0004] In addition, when using a drum screen to screen materials, some materials will stick to the inner wall of the drum screen or get stuck in the screen holes and cannot be discharged, thus affecting the screening effect of the drum screen. Utility Model Content

[0005] The utility model aims to provide a sealed self-cleaning cylindrical screen, which solves the problem in the prior art that the cylindrical screen is difficult to perform screening operations in a negative pressure environment.

[0006] The technical solution adopted by the utility model is that the sealed self-cleaning cylindrical screen includes a shell formed by interconnecting an upper shell and a lower shell, a material inlet is provided on the shell, a driving motor is provided on one side of the shell, the output shaft of the driving motor is connected to a reducer, the reducer is connected to a rotating shaft, the rotating shaft penetrates into the shell and is connected to the cylindrical screen inside the shell, and a sealed bearing is provided at the connection between the shell and the rotating shaft;

[0007] A discharge port for undersize material is provided at the bottom of the shell relative to below the cylindrical screen, a discharge port for oversize material is provided at the bottom of the shell relative to the front end of the cylindrical screen, and a cleaning mechanism for cleaning the sieve holes of the cylindrical screen is also provided at the top of the shell.

[0008] The utility model is also characterized in that:

[0009] When the material on the screen of the cylindrical screen is debris, a star-shaped screen valve is provided on the material outlet of the material on the screen, and the material outlet of the material under the screen is connected to the negative pressure pipe.

[0010] When the undersize material of the cylindrical screen is debris, a star-shaped screening valve is provided on the undersize material discharge port, and the oversize material discharge port is connected to the negative pressure pipe.

[0011] The sealed bearing includes a lower bearing seat and an upper bearing seat. The lower bearing seat is connected and fixed to the housing. The lower bearing seat and the upper bearing seat are connected and fixed by fixing bolts and fixing nuts. An annular space for the rotating shaft to pass through is formed on the inner side of the lower bearing seat and the upper bearing seat. A bearing shell is also arranged in the annular space relative to the rotating shaft, and the bearing shell is movably connected to the rotating shaft.

[0012] An oil filling hole is provided at the position of the upper bearing seat relative to the bearing shell, and lubricating oil is injected through the oil filling hole.

[0013] The cleaning mechanism includes an air bag arranged on the top of the shell, the air bag is connected to high-pressure gas, and the air bag is connected to a number of pipes relative to the shell. The several pipes are located above the cylindrical screen, and an electromagnetic valve is provided on the pipe. Each pipe is connected to a cleaning blow head at one end relative to the cylindrical screen, and the cleaning blow head has a flat mouth facing the cylindrical screen.

[0014] The bottom of the shell is connected to a shell bracket, which includes a lower adjustment bracket. The upper end of the lower adjustment bracket is plugged with an upper adjustment bracket. The end of the upper adjustment bracket away from the lower adjustment bracket is connected to the shell. Several through holes are opened on the upper and lower adjustment brackets. The shell bracket also includes an adjusting bolt, which passes through the through holes on the upper and lower adjustment brackets that overlap with each other.

[0015] The shell is provided with an interface for connecting with a vacuum cleaner.

[0016] The beneficial effects of the present invention are:

[0017] (1) The sealed self-cleaning cylindrical screen of the utility model is connected by the upper and lower shells to form a sealed shell, and the connection position between the rotating shaft and the shell is sealed by a sealing bearing to ensure that the shell is in a fully sealed environment. The discharge port of the screened material is connected to the negative pressure pipe, which is used on the one hand to extract the material screened by the cylindrical screen, and on the other hand to form a negative pressure environment inside the cylindrical screen, so as to meet the demand of screening materials under a negative pressure environment.

[0018] (2) The sealed self-cleaning cylindrical screen of the utility model is provided with an air bag above the shell, and the air bag is connected to the high-pressure steam source. When the solenoid valve is opened, the high-pressure gas enters the interior of the cylindrical screen through the cleaning pipe mouth, and performs air impact on the cylindrical screen. The material stuck inside the cylindrical screen is separated from the sieve hole under the impact of the high-pressure gas, thereby achieving the cleaning of the cylindrical screen. At the same time, the cleaning pipe mouth is set to a flat mouth, which increases the gas flow rate by reducing the gas passage area and improves the cleaning effect.

[0019] (3) The sealed self-cleaning cylindrical screen of the utility model can adjust the inclination of the cylindrical screen through the shell bracket, thereby changing the screening efficiency and the material discharge speed.

[0020] (4) The sealed self-cleaning cylindrical screen of the utility model is provided with an interface for connecting a dust collector on the shell, so that the shell can be connected to the dust removal pipe, and the dust generated during the screening process is directly extracted, thereby achieving dust control during the screening process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the utility model sealed self-cleaning cylindrical screen;

[0022] Figure 2 This is a schematic diagram of the structure of the sealed bearing in the sealed self-cleaning cylindrical screen of the utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the cleaning nozzle in the sealed self-cleaning cylindrical screen of the utility model;

[0024] Figure 4 It is a structural schematic diagram of the shell support in the sealed self-cleaning cylindrical screen of the utility model.

[0025] In the figure, 1. drive motor, 2. solenoid valve, 3. air bag, 4. cylindrical screen, 5. shell, 6. star-shaped screening valve, 7. reducer, 8. rotating shaft, 9. sealed bearing, 901. lower bearing seat, 902. upper bearing seat, 903. bearing shell, 904. fixing bolt, 905. oil filling hole, 906. fixing nut, 10. feed port, 11. cleaning blow head, 12. shell bracket, 1201. upper adjustment bracket, 1202. adjusting bolt, 1203. lower adjustment bracket, 13. discharge port for undersize material, 14. discharge port for oversize material. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Example 1

[0028] The utility model is a sealed self-cleaning cylindrical screen. Figure 1 As shown, the shell 5 is formed by connecting the upper shell and the lower shell. In order to ensure the sealing performance of the shell 5, the upper shell and the lower shell are connected by a flange, and a sealing gasket is provided at the relative position of the upper shell and the lower shell. The flange connection improves the sealing performance of the shell 5 on the one hand, and the flange is easy to disassemble on the other hand, which is convenient for daily maintenance or replacement of the cylindrical screen 4. The shell 5 is made of wear-resistant steel or ordinary steel. Wear-resistant material is applied to the area inside the shell 5 that contacts the material to prevent damage to the shell 5 due to material erosion, which affects its use in a negative pressure environment.

[0029] A feed port 10 is provided on the shell 5, and a drive motor 1 is provided on one side of the shell 5. The output shaft of the drive motor 1 is connected to a reducer 7, and the reducer 7 is connected to a rotating shaft 8. The rotating shaft 8 penetrates into the shell 5 and is connected to the cylindrical screen 4 inside the shell 5. Specifically, the cylindrical screen 4 is fixedly connected to the annular flat iron, and the annular flat iron is fixed to the rotating shaft 8 by tensioning.

[0030] The housing 5 has a bearing slot at the position where the rotating shaft 8 passes through and at the end abutment position. A sealed bearing 9 is provided in the bearing slot. The rotating shaft 8 is connected to the sealed bearing 9 to ensure the sealing of the entire device.

[0031] Furthermore, a bearing slot is provided at the connection between the upper shell and the lower shell, and the sealed bearing 9 is clamped when the upper shell and the lower shell are connected, thereby ensuring the sealing between the shell 5 and the sealed bearing 9.

[0032] Furthermore, the drive motor 1 is controlled by a frequency converter, and the speed of the cylindrical screen 4 is adjusted by controlling the speed of the drive motor 1 through the frequency converter, thereby adjusting the screening rate.

[0033] A screen under material discharge port 13 is provided at the bottom of the shell 5 relative to the bottom of the cylindrical screen 4, a screen over material discharge port 14 is provided at the bottom of the shell 5 relative to the front end of the cylindrical screen 4, and a cleaning mechanism for cleaning the screen holes of the cylindrical screen 4 is also provided at the top of the shell 5.

[0034] Furthermore, when the material on the sieve of the cylindrical screen 4 is debris, a star-shaped sieve valve 6 is provided on the sieve material discharge port 14, and the undersize material discharge port 13 is connected to the negative pressure pipe, and the debris is discharged through the star-shaped sieve valve 6. The star-shaped discharge valve 6 can be used to discharge the debris from the shell 5 while ensuring a sealed environment.

[0035] When the undersize material of the cylindrical screen 4 is debris, a star-shaped screening valve 6 is provided on the undersize material discharge port 13, and the oversize material discharge port 14 is connected to the negative pressure pipeline.

[0036] By installing the star-shaped screening valve 6 at different positions, the screening requirements of different materials can be met. At the same time, the discharge port 14 is connected to the negative pressure pipe, so that a negative pressure environment is formed inside the shell 5. Under the action of the negative pressure pipe, the feed port 10 will also form a slightly negative pressure environment. There is no need to set up a valve body at the feed port 10, which reduces the equipment manufacturing cost.

[0037] Example 2

[0038] On the basis of Example 1, Figure 2 As shown, the sealed bearing 9 of the sealed self-cleaning cylindrical screen of the present invention includes a lower bearing seat 901 and an upper bearing seat 902. The lower bearing seat 901 is connected and fixed to the housing 5. The lower bearing seat 901 and the upper bearing seat 902 are connected and fixed by fixing bolts 904 and fixing nuts 906. An annular space for the rotating shaft 8 to pass through is formed on the inner side of the lower bearing seat 901 and the upper bearing seat 902. A bearing shell 903 is also provided in the annular space relative to the rotating shaft 8, and the bearing shell 903 is movably connected to the rotating shaft 8.

[0039] Furthermore, the bearing shell 903 includes an upper bearing shell and a lower bearing shell. The upper bearing shell is fixed to the inner side of the upper bearing seat 902, and the lower bearing shell is fixed to the inner side of the lower bearing seat 901.

[0040] An oil filling hole 905 is provided at a position of the upper bearing seat 902 relative to the bearing bush 903 , and lubricating oil is injected through the oil filling hole 905 to complete regular lubrication of the bearing bush 903 .

[0041] The cylindrical screen 4 can be a woven mesh rolled into a cylindrical screen, or a punched mesh rolled into a cylinder as the screen. The woven mesh has a higher transmittance than the punched mesh.

[0042] The cleaning mechanism includes an air bag 3 arranged on the top of the shell 5, the air bag 3 is connected to high-pressure gas, the air bag 3 is connected to a plurality of pipes relative to the shell 5, the plurality of pipes are located above the cylindrical screen 4, and a solenoid valve 2 is provided on the pipe, and a cleaning blower 11 is connected to one end of each pipe relative to the cylindrical screen 4. Figure 3 As shown, the end of the cleaning blowing head 11 facing the cylindrical screen 4 is flat.

[0043] That is, when the cylindrical screen 4 needs to be cleaned, the solenoid valve 2 on the pipeline is opened, and the high-pressure gas is sent to the cleaning blow head 11 through the pipeline. Since the outlet end of the cleaning blow head 11 is a flat mouth, the high-pressure gas is accelerated twice through the flat mouth, and the high-speed gas impacts the sieve holes on the cylindrical screen 4, so that the materials stuck in the sieve holes fall off from the sieve holes, completing the self-cleaning of the cylindrical screen 4.

[0044] The housing 5 also has an interface for connecting to a vacuum cleaner. When the machine is not operating in a non-negative pressure environment, a large amount of dust will be raised when screening materials within the housing 5. Although the raised dust cannot be dispersed from the housing 5 due to the action of the housing 5, it can easily cause equipment failure in the long run. In this case, by connecting the suction end of the vacuum cleaner to the interface on the housing 5, the dust inside the housing 5 is sucked out by the vacuum cleaner, preventing equipment failure caused by long-term dust accumulation while achieving dust control during the screening process.

[0045] Example 3

[0046] On the basis of Example 2, Figure 4 As shown, the bottom of the shell 5 of the sealed self-cleaning cylindrical screen of the present invention is connected to a shell bracket 12, which includes a lower adjustment bracket 1203. The upper adjustment bracket 1201 is inserted into the upper end of the lower adjustment bracket 1203, and the end of the upper adjustment bracket 1201 away from the lower adjustment bracket 1203 is connected to the shell 5. A plurality of through holes are formed on the opposite sides of the upper adjustment bracket 1201 and the opposite sides of the lower adjustment bracket 1203. Adjustment bolts 1202 are inserted at the positions of the overlapping through holes of the upper and lower adjustment brackets 1201 and 1203, which are used to fix the relative positions of the upper and lower adjustment brackets 1201 and 1203, and the height of the shell bracket 12 can be adjusted according to height requirements.

[0047] By adjusting the height of the housing support 12 , the inclination angle of the cylindrical screen 4 can be adjusted at will, thereby changing the screening efficiency and the material discharge speed.

[0048] When the sealed self-cleaning cylindrical screen of the utility model is in use, the material to be screened is added through the feed port 10, the drive motor 1 is started, and the cylindrical screen 4 rotates under the action of the drive motor 1. The screened material enters the undersize material discharge port 13 or the oversize material discharge port 14 and is sent to the next location under the action of the negative pressure pipeline. The screened debris is discharged from the shell 5 by opening the star-shaped screen valve 6.

[0049] After the screening of the material is completed, the solenoid valve 2 is opened, and the high-pressure gas is blown through the cleaning blower head 11 to clean the cylindrical screen 4, so that the material stuck in the screen holes falls off.

Claims

1. Sealed self-cleaning drum screen, characterized by: The invention comprises a housing (5) formed by interconnecting an upper housing and a lower housing, wherein the housing (5) is provided with a feed port (10), a drive motor (1) is provided on one side of the housing (5), an output shaft of the drive motor (1) is connected to a reducer (7), the reducer (7) is connected to a rotating shaft (8), the rotating shaft (8) penetrates into the housing (5) and is connected to a cylindrical screen (4) inside the housing (5), and a sealed bearing (9) is provided at the connection between the housing (5) and the rotating shaft (8); A screen under material discharge port (13) is provided at the bottom of the housing (5) relative to the bottom of the cylindrical screen (4), and a screen over material discharge port (14) is provided at the bottom of the housing (5) relative to the front end of the cylindrical screen (4). A cleaning mechanism for cleaning the screen holes of the cylindrical screen (4) is also provided at the top of the housing (5).

2. The sealed self-cleaning drum screen according to claim 1, characterized in that: When the oversize material of the cylindrical screen (4) is debris, a star-shaped sieve valve (6) is provided on the oversize material discharge port (14), and the undersize material discharge port (13) is connected to a negative pressure pipeline.

3. The sealed self-cleaning drum screen according to claim 1, characterized in that: When the undersize material of the cylindrical screen (4) is debris, a star-shaped sieve valve (6) is provided on the undersize material discharge port (13), and the oversize material discharge port (14) is connected to a negative pressure pipeline.

4. The sealed self-cleaning drum screen according to claim 1, characterized in that: The sealed bearing (9) includes a lower bearing seat (901) and an upper bearing seat (902), wherein the lower bearing seat (901) is connected and fixed to the housing (5), and the lower bearing seat (901) and the upper bearing seat (902) are connected and fixed by fixing bolts (904) and fixing nuts (906), and an annular space for the rotating shaft (8) to pass through is formed inside the lower bearing seat (901) and the upper bearing seat (902), and a bearing shell (903) is further provided in the annular space relative to the rotating shaft (8), and the bearing shell (903) is movably connected to the rotating shaft (8).

5. The sealed self-cleaning drum screen according to claim 4, characterized in that: An oil filling hole (905) is provided on the upper bearing seat (902) at a position relative to the bearing bush (903), and lubricating oil is injected through the oil filling hole (905).

6. The sealed self-cleaning drum screen according to claim 1, characterized in that: The cleaning mechanism comprises an air bag (3) arranged on the top of the shell (5), the air bag (3) is connected to high-pressure gas, the air bag (3) is connected to a plurality of pipes relative to the shell (5), the plurality of pipes are located above the cylindrical screen (4), and a solenoid valve (2) is provided on the pipe, and each of the pipes is connected to a cleaning blow head (11) at one end relative to the cylindrical screen (4), and the cleaning blow head (11) has a flat end facing the cylindrical screen (4).

7. The sealed self-cleaning cylindrical screen according to any one of claims 1 to 6, characterized in that: The bottom of the shell (5) is connected to a shell bracket (12), and the shell bracket (12) includes a lower adjustment bracket (1203). The upper end of the lower adjustment bracket (1203) is plugged with an upper adjustment bracket (1201). The end of the upper adjustment bracket (1201) away from the lower adjustment bracket (1203) is connected to the shell (5). The upper adjustment bracket (1201) and the lower adjustment bracket (1203) are both provided with a plurality of through holes. The shell bracket (12) further includes an adjustment bolt (1202), and the adjustment bolt (1202) passes through the through holes on the upper adjustment bracket (1201) and the lower adjustment bracket (1203) that overlap with each other.

8. The sealed self-cleaning cylindrical screen according to any one of claims 1 to 6, characterized in that: The housing (5) is provided with an interface for connecting to a vacuum cleaner.

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