A central drive flat disc filter

Abstract

The application discloses a center transmission flat disc filter and belongs to the technical field of solid-liquid separation equipment. The filter comprises a disc body, a discharging screw, a distribution head, a transmission device, a washing device and a feeding device; a wheel belt is arranged at the lower part of the outer edge of the disc body; a supporting wheel device is arranged at the lower part of the outer side of the disc body in the circumferential direction; the supporting wheel device comprises a solid roller and an elastic supporting seat; the solid roller is located above the elastic supporting seat and is in rolling contact with the wheel belt, thus effectively solving the problems of sagging deformation and instability of the large-diameter disc body edge and breaking through the bottleneck of large-scale. In addition, a gas flow guide plate is arranged at the corner where the internal back-blowing channel of the distribution head enters the distribution channel at the bottom of the disc body, so that the gas flow vortex resistance is reduced, and the filter cloth regeneration effect is improved. The application realizes the large-scale of the center transmission flat disc filter, and significantly improves the equipment operation stability, the filtering efficiency and the production capacity.

Description

Technical Field

[0001] This invention relates to the field of solid-liquid separation equipment technology, specifically to a center-driven flat disc filter. This equipment is mainly used in chemical, mineral processing, and other fields, and is particularly suitable for material washing and dewatering operations in industries such as alumina, phosphate chemicals, and vanadium chemicals. Background Technology

[0002] Disc filters are solid-liquid separation devices widely used in chemical, mineral processing, and other fields, especially in the alumina, phosphate, and vanadium chemical industries, where they are mainly used for material washing and dewatering. Based on the different drive methods, disc filters are mainly divided into two types: edge-driven and center-driven. Among them, center-driven disc filters are widely used due to their compact structure and small footprint.

[0003] However, existing center-driven disc filters face significant bottlenecks in terms of scale. Currently, the diameter of existing center-driven disc filters is typically limited to around 12.5 meters, making further increases in size difficult. This is mainly due to the following two technical challenges: Firstly, regarding structural stability, because the foundation of the center-driven flat disc filter is located in the center, the cantilever length at the edge of the disc increases significantly with the increase in the equipment diameter. This causes the center of gravity to shift outward during operation, no longer located at the point of force of the central drive, thus generating a huge eccentric torque. This structure makes the edge of the disc extremely prone to sagging deformation, which in severe cases can even lead to disc instability, posing a significant safety hazard during equipment operation. Furthermore, traditional flat discs typically do not undergo overall heat treatment and overall machining. After a period of operation, deformation easily occurs due to factors such as the release of welding stress, leading to a decrease in disc surface flatness and further exacerbating operational instability.

[0004] Secondly, the existing back-blowing channel design has significant flaws in the filter cloth regeneration system. Existing back-blowing channels often contain right-angle bends, which generate strong vortices at these bends when high-speed airflow passes through. This not only increases airflow resistance but also increases the ineffective volume within the channel. This design causes the air pressure and velocity of the back-blowing air to decrease significantly upon reaching the disc surface, greatly reducing the back-blowing effect and making filter cloth regeneration difficult. Poor filter cloth regeneration directly affects the filtration output, increases the number of filter cloth washing cycles per shift, and reduces the effective operating time of the equipment and the lifespan of the filter cloth.

[0005] In summary, how to solve the problems of disc edge sagging and deformation, instability risk, and poor filter cloth regeneration effect faced by center-driven flat disc filters in the process of scaling up is a technical problem that urgently needs to be solved by technicians in this field. Summary of the Invention

[0006] The purpose of this invention is to provide a center-driven flat disc filter to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following solution: A center-driven flat disc filter includes a disc body, a discharge screw, a distribution head, a transmission device, a washing device, and a feeding device, characterized in that: The transmission device is located at the center of the disc body and is used to drive the disc body to rotate; The dispensing head is located at the bottom of the disk body, and the outlet of the dispensing head is connected to the dispensing channel at the bottom of the disk body; The unloading screw, washing device and feeding device are all located above the disc body; The lower outer edge of the disc is provided with a tire, and a support roller device is provided on the lower outer side of the disc along the circumferential direction; The roller support device includes a solid roller and an elastic support base. The solid roller is located above the elastic support base, and the top of the solid roller makes rolling contact with the tire below the disc. The distribution head is equipped with a backflush channel inside, and an airflow guide plate is provided at the corner where the backflush channel enters the distribution channel at the bottom of the disc.

[0008] Furthermore, the elastic support includes a butterfly spring, which provides a preload to keep the solid roller always attached to the belt of the disc body.

[0009] Furthermore, the total stiffness of the disc spring is 9500 N / mm, and the stroke is 4 mm.

[0010] Furthermore, the airflow guide plate is installed at an angle of 48° to reduce vortex resistance at airflow corners.

[0011] As can be seen from the above technical solution, compared with the prior art, the beneficial effects of the present invention are as follows: By adding a ring of support rollers to the lower outer side of the disc, the risk of edge sagging and instability caused by excessively long cantilever arms in large-diameter discs is effectively solved, successfully achieving the scaling up of the equipment and significantly improving the single-machine capacity.

[0012] The roller support device employs a structure of solid rollers combined with elastic support seats. The disc springs provide preload, ensuring the rollers remain firmly attached to the tire. This not only supports the disc surface but also buffers minor deformations and vibrations, preventing premature component failure due to rigid impacts. Simultaneously, the overall heat treatment and machining process of the disc body eliminates welding stress, ensuring disc surface flatness. This results in smoother equipment operation, reduced energy consumption, and extended overhaul periods and service life. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the main structure of the center-driven flat disc filter in an embodiment of the present invention; Figure 2 This is a top view of the centrifugal flat disc filter in an embodiment of the present invention; Figure 3 This is a schematic diagram of the support roller device according to an embodiment of the present invention.

[0015] Explanation of reference numerals in the attached figures: 1. Disc body; 2. Unloading screw; 3. Distributor head; 4. Transmission device; 5. Support roller device; 51. Solid roller; 52. Butterfly spring; 53. Adjusting bolt; 6. Washing device; 7. Feeding device; 8. Airflow guide plate. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0017] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0018] Example 1 like Figures 1 to 3 As shown, this embodiment provides a center-driven flat disc filter, which is mainly used to solve the problems of edge sagging deformation, instability risk and poor filter cloth regeneration effect faced by the existing center-driven flat disc filter in the process of scaling up (diameter exceeding 13 meters).

[0019] The filter mainly includes a disc body 1, a discharge screw 2, a distribution head 3, a transmission device 4, a support roller device 5, a washing device 6, and a feeding device 7.

[0020] The disc body 1 is an integral symmetrical circular structure with a diameter designed to be greater than 13 meters; for example, in this embodiment, the disc body diameter can reach 15 meters. Due to the increased diameter, the outer cantilever of the disc body 1 is very large (exceeding 5 meters), and the support position is relatively inward, resulting in the center of gravity of the running cantilever section being biased outward.

[0021] The transmission device 4 is located at the center of the disc body 1, and specifically drives the disc body 1 to rotate using a central transmission method. This structure ensures that the center of gravity of the disc body 1 is located on the basis of the central transmission, but in the case of large-scale operation, the center of gravity of the cantilever section shifts outward.

[0022] The distribution head 3 is located at the bottom of the disc body 1, and the outlet of the distribution head 3 is connected to the distribution channel at the bottom of the disc body 1. In this embodiment, the disc surface is divided into six areas by the distribution head 3 to achieve continuous production and ensure that the washing effect and the final moisture content of the material meet the standard requirements. These six areas are divided into different angles as needed, mainly divided into the feeding area, washing area 2, washing area 1, unloading area, still area, and backflushing area.

[0023] The unloading screw 2, washing device 6, and feeding device 7 are all located above the disc body 1. The unloading screw 2 is used to unload the filtered material, the washing device 6 is used to wash the material, and the feeding device 7 is used to evenly distribute the slurry on the disc surface.

[0024] Example 2 To address the issues of sagging, deformation, and instability at the edges of the disc body 1 after its diameter is increased, this embodiment provides a tire at the lower outer edge of the disc body 1 and a ring of support rollers 5 along the circumferential direction at the lower outer side of the disc body 1.

[0025] like Figure 3 As shown, the roller support device 5 includes a solid roller 51 and an elastic support base. The solid roller 51 is located above the elastic support base, and the top of the solid roller 51 makes rolling contact with the tire below the disc body 1.

[0026] Specifically, the elastic support includes a disc spring 52 and an adjusting bolt 53. The adjusting bolt 53 is arranged around the disc spring 52, and the preload of the disc spring 52 can be adjusted by adjusting the adjusting bolt 53.

[0027] After adding the outer ring support roller device 5, the instability factor of the equipment's center of gravity being off to the outside was eliminated, and the support roller played the role of supporting the plate surface.

[0028] The preload provided by the disc spring 52 ensures that the solid roller 51 remains attached to the belt of the disc body 1. Even if the lower belt undergoes slight deformation (such as bounce) due to the large-diameter cantilever, the disc spring 52 can buffer it through its own elastic deformation, preventing the solid roller 51 from failing quickly due to rigid impact.

[0029] This roller device not only supports the disc surface but also reduces its vibration, making the disc surface run more smoothly. This ensures that the material is evenly distributed on the disc surface, and the smooth spiral discharge also facilitates the back-blowing regeneration of the filter cloth.

[0030] In this embodiment, the preferred number of roller support devices 5 is 16. According to design calculations, a ring of 16 roller support devices will withstand a total pressure of 24 tons, equivalent to a normal load of 1.5 tons per roller. The selected disc springs 52 have a total stiffness of 9500 N / mm and a stroke of 4 mm. This parameter design can effectively cope with the deflection deformation of the disc edge.

[0031] Example 3 In view of the problem that the unreasonable design of the backflush channel in the prior art leads to the difficulty of filter cloth regeneration, this embodiment improves the backflush channel of the distribution head 3.

[0032] The distributor head 3 has a backflush channel inside, and an airflow guide plate 8 is provided at the corner where the backflush channel enters the bottom distribution channel of the disc body 1.

[0033] Specifically, the preferred installation angle for the airflow guide plate 8 is 48°. The principle of installation is to minimize sharp turns and abrupt changes in cross-sectional area.

[0034] Traditional backflushing channels have right-angle bends, which create vortices in the high-speed air, slowing the flow and affecting the backflushing effect. This invention adds an airflow guide plate 8 to guide the right-angle bend into a smoother flow path, preventing vortices from forming in the high-speed air and ensuring that the backflushing air reaches the disc surface quickly and efficiently. This improved backflushing effect directly leads to better filter cloth regeneration.

[0035] Example 4 In addition to the above structural improvements, in order to ensure the long-term stable operation of the large-scale disk, this embodiment also limits the manufacturing process of the disk 1.

[0036] The entire disc body 1 is heat-treated to eliminate residual stress from welding and processing, and to prevent deformation due to stress release after the equipment is in operation.

[0037] At the same time, the entire disc body 1 is machined on a machine tool (such as a large vertical lathe) to ensure that the disc surface is flat.

[0038] By combining heat treatment and overall machining, the misalignment and deformation caused by stress concentration that gradually appeared after a year of operation of the flat plate were eliminated, ensuring the smooth and reliable operation of the large-scale center drive flat plate.

[0039] Example 5 After adopting the above technical solution, a test was conducted on a flat plate with a diameter of 15 meters under full load operation, and the results are as follows: The deflection at the edge of the disk is reduced by 60%, effectively solving the problem of edge sagging.

[0040] The backflushing regeneration efficiency of the filter cloth is improved by 30%.

[0041] The number of times the filter cloth needs to be washed per shift is reduced by 1.5 times, thus extending the effective operating time of the equipment.

[0042] The lifespan of the filter cloth is extended, which also increases the equipment's productivity.

[0043] In summary, this invention successfully solves the technical bottleneck of large-scale center-drive flat disc filters by adding a support roller device with elastic support, optimizing the backflushing channel structure, and improving the disc body processing technology, and has significant economic and social benefits.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A center-driven flat disc filter, comprising a disc body (1), a discharge screw (2), a distribution head (3), a transmission device (4), a washing device (6), and a feeding device (7), characterized in that: The transmission device (4) is located at the center of the disc body (1) and is used to drive the disc body (1) to rotate; The dispensing head (3) is located at the bottom of the disk body (1), and the outlet of the dispensing head (3) is connected to the dispensing channel at the bottom of the disk body (1). The unloading screw (2), washing device (6) and feeding device (7) are all located above the disc body (1); The lower outer edge of the disc body (1) is provided with a tire, and a support roller device (5) is provided on the lower outer side of the disc body (1) along the circumferential direction. The roller support device (5) includes a solid roller (51) and an elastic support seat. The solid roller (51) is located above the elastic support seat, and the top of the solid roller (51) is in rolling contact with the tire below the disc body (1). The distribution head (3) is provided with a backflush channel inside, and an airflow guide plate (8) is provided at the corner of the distribution channel at the bottom of the disc body (1).

2. The center-driven flat disc filter according to claim 1, characterized in that, The elastic support includes a butterfly spring (52) which provides a preload to keep the solid roller (51) always attached to the belt of the disc body (1).

3. The center-driven flat disc filter according to claim 2, characterized in that, The total stiffness of the disc spring (52) is 9500 N / mm, and the stroke is 4 mm.

4. The center-driven flat disc filter according to claim 1, characterized in that, The airflow guide plate (8) is installed at an angle of 48° to reduce vortex resistance at the airflow corner.

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