Cylinder screen

Abstract

The utility model relates to a drum screen which comprises a support, a shell is arranged on the support, a bin gate is arranged on the shell, a feeding pipe and a screening device are arranged on the shell, and the screening device comprises a screening drum, screening holes, an outer drum, a first connecting rod, a connecting pipe, a first connecting ring, a second connecting ring and a second connecting rod. The outlet end of the feeding pipe is located on the inner side of the connecting pipe, a first air draft branch pipe is arranged at the top of the shell, an oversize product discharging pipe and a grain discharging pipe are arranged on the shell, a plurality of rubber sheet sets are arranged on the first driven shaft, each rubber sheet set comprises a plurality of rubber sheets, and part of the rubber sheets are movably connected with the outer barrel. Dust attached to an outer barrel of the drum screen can be reduced in the process that granular fruits are separated through the drum screen. The utility model has the advantages of convenient use and wide market prospect.

Description

Technical Field

[0001] This utility model relates to the field of grain screening equipment, specifically to a cylindrical screen. Background Technology

[0002] The working part of a cylindrical screen is cylindrical, with the entire screen rotating around its axis, which is typically installed at a small angle. Material is fed in from one end of the cylinder; fine particles pass through the screen openings on the working surface, while coarse particles are discharged from the other end. Cylindrical screens operate at very low speeds, ensuring stable operation and good dynamic balance. However, their screen openings are prone to clogging, resulting in low screening efficiency, a small working area, and low productivity. They are rarely used as screening equipment in mineral processing plants. Cylindrical screens are widely used in the metallurgical, building materials, chemical, grain, pharmaceutical, abrasive, and fertilizer industries for screening dry powdery or granular materials. They are particularly suitable for dry production of manufactured sand and can also be used for screening granular wet materials. When the cylindrical screen is working, the material to be screened is fed into the screen cylinder through the feed hopper. It rises with the inner wall of the rotating screen cylinder and then falls loosely after reaching a certain height. This process is repeated. The material continuously entering the screen cylinder is affected by pressure and looseness, and gradually moves towards the outlet at the other end of the screen cylinder. At the same time, during this process, the material smaller than the screen hole leaks out through the screen hole, while the material larger than the screen hole is carried to the other end of the screen hole and flows out through the oversize discharge port to complete the grading process.

[0003] In agriculture, cylindrical screens are commonly used for offline screening of harvested granular crops such as corn and soybeans. A typical cylindrical screen includes a feeding mechanism, a screen cylinder, an outer cylinder surrounding the screen cylinder, and a connecting rod between the outer cylinder and the screen cylinder. Material is fed into the inner cavity of the screen cylinder by the feeding mechanism. Larger pieces of debris move from one end of the screen cylinder to the other. During this process, the larger pieces are trapped inside the screen cylinder due to the obstruction of the screen holes, while the granular crops pass through the screen holes and enter the inner cavity of the outer cylinder, thus separating the larger pieces from the granular crops. In the process of separating the larger pieces from the granular crops, existing cylindrical screens often include an air separation mechanism. The function of the air separation mechanism is to use airflow to separate lighter impurities and remove dust from the larger pieces and granular crops during the separation process. During this process, a large amount of dust will adhere to the outer wall of the outer cylinder. During routine maintenance of the cylindrical screen, due to the large amount of dust adhering to the outer wall of the outer cylinder, after opening the maintenance door on the cylindrical screen shell, the external airflow will directly blow onto the outer wall of the outer cylinder due to the air duct connected to the top of the cylindrical screen shell. During this period, the dust adhering to the outer cylinder will cause a large amount of dust to be stirred up by the external airflow. As a result, the visibility will be reduced due to the large amount of dust in the gas near the maintenance door of the cylindrical screen shell, causing unnecessary trouble for the maintenance work. After the maintenance is completed, a large amount of dust will be released into the environment, which will have a negative impact on the surrounding environment. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides a cylindrical sieve that can reduce dust adhering to the outer cylinder of the sieve during the separation of granular fruits, thereby reducing dust generated during the retrieval process, thus overcoming the deficiencies in existing technologies.

[0005] The technical solution adopted by this utility model is as follows: a cylindrical screen, including a support frame, an outer shell on the support frame, a door on the outer shell, a feed pipe and a screening device on the outer shell, the screening device including a screen cylinder, screen holes on the screen cylinder, an outer cylinder on the outside of the screen cylinder, a first connecting rod between the outer cylinder and the screen cylinder, a connecting pipe at the end of the screen cylinder near the feed pipe, a first connecting ring between the connecting pipe and the outer cylinder, a second connecting ring at the end of the screen cylinder away from the feed pipe, and a second connecting rod between the second connecting ring and the screen cylinder; The outlet end of the feed pipe is located inside the connecting pipe. A first exhaust branch pipe is provided on the top of the outer shell. A screen discharge pipe is provided on the outer shell below the end of the screen cylinder away from the feed pipe. A grain discharge pipe is provided on the outer shell below the end of the outer cylinder away from the feed pipe. Several rubber sheet groups are provided on the first driven shaft. Each rubber sheet group includes several rubber sheets. The rubber sheets in each rubber sheet group are spirally distributed on the first driven shaft along the direction from one end of the first driven shaft to the other end of the first driven shaft. Some rubber sheets are movably connected to the outer cylinder.

[0006] Preferably, the support is provided with a second driven shaft, a drive motor and a reducer. The input end of the reducer and the output end of the drive motor are connected in a transmission connection. The second driven shaft is connected to the second connecting ring of the screening device. The central axis of the second driven shaft and the central axis of the screen cylinder are located on the same axis. The reducer is provided with a first pulley and a first gear. The second driven shaft is provided with a second gear. The first driven shaft is provided with a second pulley. The second pulley and the first pulley are provided with a transmission belt. The first gear and the second gear are provided with a transmission chain.

[0007] Preferably, the screen discharge pipe is located at one end of the bottom of the outer shell, the grain discharge pipe and the screen discharge pipe are connected, and a number of light debris discharge pipes are arranged sequentially on the bottom of the outer shell between the grain discharge pipe and the feed pipe along the direction from near the feed pipe to away from the feed pipe.

[0008] Preferably, the diameters of the inner circles of the lightweight debris discharge pipe, the sieve material discharge pipe, and the grain discharge pipe all gradually decrease along the direction from near the outer shell to far away from the outer shell.

[0009] Preferably, the grain discharge pipe is provided with a second exhaust branch pipe, and filters are respectively provided on the end of the second exhaust branch pipe near the grain discharge pipe and the end of the first exhaust branch pipe near the outer shell.

[0010] Preferably, a main exhaust pipe is provided on the second exhaust branch pipe and the first exhaust branch pipe, and a third exhaust branch pipe is provided between the main exhaust pipe and the second exhaust branch pipe, as well as between the main exhaust pipe and the first exhaust branch pipe. Each third exhaust branch pipe is provided with a regulating valve. A dust collector and a fan are sequentially provided along the direction from the inlet end to the outlet end of the main exhaust pipe.

[0011] Preferably, two rollers are provided on the support below the connecting pipe, and each roller is movably connected to the connecting pipe.

[0012] The beneficial effects of this utility model are as follows: This utility model utilizes the rotation of the first driven shaft to drive several rubber sheet groups to rotate. During this period, some of the rubber sheets in the rubber sheet groups strike the outer cylinder, causing the outer cylinder to vibrate. Lightweight debris and dust adhering to the outer cylinder will partially fall off. This reduces the amount of lightweight debris or dust adhering to the outer cylinder, thereby reducing the dust generated when the equipment is in operation and the door is opened for maintenance. This reduces the dust generated when the external airflow enters the inner cavity of the outer shell through the opened door and directly blows onto the outer wall of the outer cylinder, which is caused by a large amount of lightweight debris and dust adhering to the outer wall of the outer cylinder. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 for Figure 1 A magnified view of detail A.

[0015] Figure 3 This is a structural schematic diagram of the component of this utility model.

[0016] Figure 4 for Figure 2 A magnified view of detail B.

[0017] Figure 5 This is a structural schematic diagram of the component of this utility model.

[0018] Figure 6 for Figure 5 A magnified view of detail C.

[0019] Figure 7 This is a structural schematic diagram of the component of this utility model.

[0020] Figure 8 This is a schematic diagram of the structure of this utility model.

[0021] Figure 9 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0022] like Figures 1 to 9 As shown, a cylindrical screen includes a support 1, a housing 2 mounted on the support 1, a door 3 mounted on the housing 2, a feed pipe 4 and a screening device mounted on the housing 2. The screening device includes a screen cylinder 5, screen holes 6 on the screen cylinder 5, an outer cylinder 7 on the outside of the screen cylinder 5, a first connecting rod 8 between the outer cylinder 7 and the screen cylinder 5, a connecting pipe 9 at the end of the screen cylinder 5 near the feed pipe 4, a first connecting ring 10 between the connecting pipe 9 and the outer cylinder 7, a second connecting ring 11 at the end of the screen cylinder 5 away from the feed pipe 4, and a second connecting rod 12 between the second connecting ring 11 and the screen cylinder 5; the feed pipe 4... The outlet end is located inside the connecting pipe 9. The top of the outer shell 2 is provided with a first exhaust branch pipe 13. The outer shell 2 below the end of the screen cylinder 5 away from the feed pipe 4 is provided with a screen discharge pipe 14. The outer shell 2 below the end of the outer cylinder 7 away from the feed pipe 4 is provided with a grain discharge pipe 15. The support 1 is provided with a first driven shaft 16. The first driven shaft 16 is provided with a number of rubber sheet groups. Each rubber sheet group includes a number of rubber sheets 17. The number of rubber sheets 17 in each rubber sheet group are spirally distributed on the first driven shaft 16 along the direction from one end of the first driven shaft 16 to the other end of the first driven shaft 16.

[0023] A baffle is provided on the oversize discharge pipe 14 and the grain discharge pipe 15. The baffle is provided with a through hole, which is fitted onto the screen cylinder 5 outside the outer cylinder 7. The baffle is located between the oversize discharge pipe 14 and the grain discharge pipe 15. The installation of the baffle reduces the probability of material being transported from the outer cylinder 7 into the oversize discharge pipe 14.

[0024] The bracket 1 is provided with a second driven shaft 18, a drive motor 19 and a reducer 20. The input end of the reducer 20 and the output end of the drive motor 19 are connected for transmission. The second driven shaft 18 is connected to the second connecting ring 11 of the screening device. The central axis of the second driven shaft 18 and the central axis of the screen cylinder 5 are located on the same axis. The central axis of the second driven shaft 18, the central axis of the outer cylinder 7 and the central axis of the screen cylinder 5 are located on the same axis. The included angle between the central axis of the screen cylinder 5 and the horizontal plane is 5 degrees to 20 degrees. The reducer 20 is provided with a first pulley 21 and a first gear 22. The second driven shaft 18 is provided with a second gear 23. The first driven shaft 16 is provided with a second pulley 24. The second pulley 24 and the first pulley 21 are provided with a transmission belt 25. The first gear 22 and the second gear 23 are provided with a transmission chain 26.

[0025] The screen discharge pipe 14 is located at one end of the bottom of the outer casing 2. The grain discharge pipe 15 is connected to the screen discharge pipe 14. Several lightweight debris discharge pipes 27 are sequentially arranged on the bottom of the outer casing 2 between the grain discharge pipe 15 and the feed pipe 4, moving from near the feed pipe 4 to away from it. The diameters of the inscribed circles of the lightweight debris discharge pipes 27, the screen discharge pipe 14, and the grain discharge pipe 15 all gradually decrease from near to away from the outer casing 2. Several lightweight debris discharge pipes 27 and the first exhaust branch pipe 13 are located between the end of the outer cylinder 7 near the feed pipe 4 and the end of the outer cylinder 7 near the grain discharge pipe 15.

[0026] A second exhaust branch pipe 28 is provided on the grain discharge pipe 15. Filter screens 29 are respectively provided on the end of the second exhaust branch pipe 28 near the grain discharge pipe 15 and on the end of the first exhaust branch pipe 13 near the outer casing 2. Installing filter screens 29 facilitates the further separation of materials conveyed by the grain discharge pipe 15 and the first exhaust branch pipe 13. An exhaust main pipe 30 is provided on the second exhaust branch pipe 28 and the first exhaust branch pipe 13. A third exhaust branch pipe 31 is respectively provided between the exhaust main pipe 30 and the second exhaust branch pipe 28, and between the exhaust main pipe 30 and the first exhaust branch pipe 13. Each third exhaust branch pipe 31 is provided with a regulating valve 32. A dust collector 33 and a fan 34 are sequentially arranged along the exhaust main pipe 30 from its inlet end to its outlet end. Two rollers 35 are provided on the support 1 below the connecting pipe 9, and each roller 35 is movably connected to the connecting pipe 9.

[0027] like Figure 9 As shown, during installation, a first impurity storage tank 36, a second impurity storage tank 37, and a finished product storage tank 38 need to be installed below the product. The screen discharge pipe 14 and the first impurity storage tank 36 are connected by a first conveying pipe 39, the finished product storage tank 38 and the grain discharge pipe 15 are connected by a second conveying pipe 40, and several light impurity discharge pipes 27 and the second impurity storage tank 37 are connected by a third conveying pipe 41.

[0028] The instructions for using this product are as follows: Figures 1 to 9As shown, the blower 34 and drive motor 19 are started. The drive motor 19 drives the reducer 20 to work. The output end of the reducer 20 drives the first driven shaft 16 and the second driven shaft 18 to rotate synchronously, thereby driving the screening device to rotate. At the same time, since the blower 34 is started, the external airflow enters the inner cavity of the screening device through the feed pipe 4 and is then divided into two parts, namely the first part airflow and the second part airflow. The first part airflow is sequentially transported through the inner cavity of the outer shell 2, the first exhaust branch pipe 13, and the corresponding third exhaust branch pipe 31 to the exhaust main pipe 30. The second part airflow is sequentially transported through the inner cavity of the outer shell 2, the grain discharge pipe 15, the second exhaust branch pipe 28, and the corresponding third exhaust branch pipe 31 to the exhaust main pipe 30. The first part airflow and the second part airflow merge again after being transported to the exhaust main pipe 30 to form the exhaust airflow. The exhaust airflow is discharged to the atmosphere after passing through the dust collector 33. During this period, it is necessary to adjust the opening of the regulating valve 32 installed on each third exhaust branch pipe 31 to complete the pre-operation work.

[0029] Once the pre-run is complete, the formal screening process can begin. The difference between the formal and pre-run screening processes is that, once the formal screening begins, the worker feeds the material to be screened into the feed pipe 4. The material first enters the inner cavity of the screen cylinder 5 in the screening device. As the screen cylinder 5 rotates, large debris forms the oversize material, which remains inside the screen cylinder 5 and continues to move towards the end of the screen cylinder 5 near the oversize discharge pipe 14. Meanwhile, granular grains enter the cavity between the outer cylinder 7 and the screen cylinder 5 through the screen holes 6 on the screen cylinder 5 and move towards the end of the outer cylinder 7 near the grain discharge pipe 15. The separation process of the oversize material and the granular grains occurs during the process of the material entering the inner cavity of the screen cylinder 5, the continuous movement of the oversize material in the screen cylinder 5, and the continuous movement of the granular grains in the inner cavity of the outer cylinder 7. The dust and light impurities carried in the three mixtures are continuously swept away by the airflow conveyed through the feed pipe 4 to separate the dust and light impurities from the oversize material, the granular fruit, and the material to be screened. Most of the dust and light impurities are conveyed to the first exhaust branch pipe 13 along with the first part of the airflow. The light impurities are blocked by the screen 29 in the first exhaust branch pipe 13 and remain in the inner cavity of the outer shell 2, and continue to descend along the inner cavity of the outer shell 2. During this period, a small amount of dust in the light impurities is adsorbed on the outer wall of the outer shell 2, and then conveyed to the second impurity storage tank 37 through several light impurity discharge pipes 27. The dust adsorbed on the outer wall of the outer shell 2 is separated from the outer shell 2 by the vibration generated by several rubber sheets 17 hitting the outer cylinder 7, and then forms dust again that moves with the continuously conveyed first part of the airflow.

[0030] The material on the sieve is conveyed along the inner cavity of the sieve cylinder 5 to the sieve discharge pipe 14, and then conveyed by the sieve discharge pipe 14 to the first impurity storage tank 36; the granular fruit is conveyed through the inner cavity of the outer cylinder 7 to the grain discharge pipe 15. During the conveying process of the granular fruit in the grain discharge pipe 15, the dust and granular fruit are separated again in the second part of the airflow; the granular fruit after the second separation is conveyed to the finished product storage tank 38 for temporary storage.

[0031] In this embodiment, by utilizing the rotation of the first driven shaft 16 to drive several rubber sheet groups to rotate, during this period, some of the rubber sheets 17 in the rubber sheet groups strike the outer cylinder 7, causing the outer cylinder 7 to vibrate. Lightweight debris and dust adhering to the outer cylinder 7 will partially fall off, reducing the amount of lightweight debris or dust adhering to the outer cylinder 7. This reduces the dust generated when the equipment is in operation and the door 3 is opened for maintenance, causing external airflow to enter the inner cavity of the outer casing 2 through the opened door 3 and directly blow onto the outer wall of the outer cylinder 7, which is caused by a large amount of lightweight debris and dust adhering to the outer wall of the outer cylinder 7.

[0032] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A cylindrical screen, comprising a support (1), wherein a shell (2) is disposed on the support (1), and a hopper door (3) is disposed on the shell (2), characterized in that: The outer casing (2) is provided with a feed pipe (4) and a screening device. The screening device includes a screen cylinder (5), screen holes (6) provided on the screen cylinder (5), an outer cylinder (7) provided on the outside of the screen cylinder (5), a first connecting rod (8) provided between the outer cylinder (7) and the screen cylinder (5), a connecting pipe (9) provided at the end of the screen cylinder (5) near the feed pipe (4), a first connecting ring (10) provided between the connecting pipe (9) and the outer cylinder (7), a second connecting ring (11) provided at the end of the screen cylinder (5) away from the feed pipe (4), and a second connecting rod (12) provided between the second connecting ring (11) and the screen cylinder (5). The outlet end of the feed pipe (4) is located inside the connecting pipe (9), and outside the outer cylinder (5)... The top of the shell (2) is provided with a first exhaust branch pipe (13), the shell (2) below the end of the sieve cylinder (5) away from the feed pipe (4) is provided with a screen discharge pipe (14), the shell (2) below the end of the outer cylinder (7) away from the feed pipe (4) is provided with a grain discharge pipe (15), a number of rubber sheet groups are provided on the first driven shaft (16), each rubber sheet group includes a number of rubber sheets (17), the number of rubber sheets (17) in each rubber sheet group are spirally distributed on the first driven shaft (16) along the direction from one end of the first driven shaft (16) to the other end of the first driven shaft (16), and some rubber sheets (17) are movably connected to the outer cylinder (7).

2. The cylindrical sieve according to claim 1, characterized in that: The bracket (1) is provided with a second driven shaft (18), a drive motor (19) and a reducer (20). The input end of the reducer (20) and the output end of the drive motor (19) are connected in a transmission. The second driven shaft (18) is connected to the second connecting ring (11) of the screening device. The central axis of the second driven shaft (18) and the central axis of the screen cylinder (5) are located on the same axis. The reducer (20) is provided with a first pulley (21) and a first gear (22). The second driven shaft (18) is provided with a second gear (23). The first driven shaft (16) is provided with a second pulley (24). The second pulley (24) and the first pulley (21) are provided with a transmission belt (25). The first gear (22) and the second gear (23) are provided with a transmission chain (26).

3. The cylindrical sieve according to claim 1, characterized in that: The screen discharge pipe (14) is located at one end of the bottom of the outer shell (2). The grain discharge pipe (15) is connected to the screen discharge pipe (14). Several light debris discharge pipes (27) are arranged sequentially on the bottom of the outer shell (2) between the grain discharge pipe (15) and the feed pipe (4) along the direction from near the feed pipe (4) to away from the feed pipe (4).

4. The cylindrical sieve according to claim 3, characterized in that: The diameter of the inner circle of the lightweight debris discharge pipe (27), the inner circle of the sieve discharge pipe (14), and the inner circle of the grain discharge pipe (15) all gradually decrease along the direction from near the outer shell (2) to far away from the outer shell (2).

5. The cylindrical sieve according to claim 1, characterized in that: The grain discharge pipe (15) is provided with a second exhaust branch pipe (28), and a filter screen (29) is provided on the end of the second exhaust branch pipe (28) near the grain discharge pipe (15) and on the end of the first exhaust branch pipe (13) near the outer shell (2).

6. The cylindrical sieve according to claim 5, characterized in that: The second exhaust branch pipe (28) and the first exhaust branch pipe (13) are provided with an exhaust main pipe (30). A third exhaust branch pipe (31) is provided between the exhaust main pipe (30) and the second exhaust branch pipe (28) and between the exhaust main pipe (30) and the first exhaust branch pipe (13). A regulating valve (32) is provided on each third exhaust branch pipe (31). A dust collector (33) and a fan (34) are arranged sequentially along the direction from the inlet end of the exhaust main pipe (30) to the outlet end of the exhaust main pipe (30).

7. The cylindrical sieve according to claim 1, characterized in that: The bracket (1) below the connecting pipe (9) is provided with a roller (35). Two rollers (35) are used, and each roller (35) is movably connected to the connecting pipe (9).

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