Dehydration device

Abstract

This disclosure pertains to the technical field of coal washing equipment, and specifically relates to a dewatering device. The device includes at least two vertically arranged first and second dewatering screens. The first dewatering screen has a first arc-shaped dewatering surface configured to allow material input from its upper end to flow naturally to its lower end under its own weight and then be ejected. The first arc-shaped dewatering surface has a plurality of dewatering holes. The second dewatering screen is located below the first screen and has a second arc-shaped dewatering surface with the opposite curvature direction to the first arc-shaped dewatering surface. The second arc-shaped dewatering surface is configured to receive material from the lower end of the first screen, allowing material input from its upper end to flow naturally to its lower end under its own weight and then be ejected. The second arc-shaped dewatering surface also has a plurality of dewatering holes. This dewatering device can effectively dewater materials, prevent material accumulation, and reduce downstream load.

Description

Technical Field

[0001] This disclosure belongs to the technical field of coal washing and processing equipment, and specifically relates to a dewatering device. Background Technology

[0002] In the traditional heavy media coal preparation field, a qualified medium pump maintains a certain pressure to draw qualified medium liquid from the qualified medium tank to a hydrocyclone. The raw coal to be selected enters the hydrocyclone through the feed port. Under the action of the hydrocyclone, clean coal, middlings, and gangue are separated to provide qualified clean coal products for coking, and then dewatering treatment is carried out.

[0003] Existing dewatering devices are generally arc-shaped screens. When the material particles produced by the material sorting equipment are large, material accumulates on the upper surface of the arc-shaped screen. To solve this problem, the current solution is to increase the overall tilt angle of the arc-shaped screen. While this can alleviate the problem of material accumulation on the surface of the arc-shaped screen, the high material flow rate means that a large amount of water will flow over the upper surface of the arc-shaped screen along with the material, weakening the screen's dewatering capacity and ultimately increasing the processing pressure on subsequent processes. Utility Model Content

[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and to provide a dehydration device.

[0005] The dewatering apparatus disclosed herein includes at least two first dewatering screens and a second dewatering screen arranged sequentially along a vertical direction:

[0006] The first dewatering screen has a first arc-shaped dewatering surface, and the first arc-shaped dewatering surface is configured to allow the material input from the upper end of the first arc-shaped dewatering surface to flow naturally to the lower end under its own weight and then be thrown out. The first arc-shaped dewatering surface is provided with a plurality of dewatering holes.

[0007] The second dewatering screen is located below the first dewatering screen and has a second arc-shaped dewatering surface. The second arc-shaped dewatering surface has the opposite curvature direction to the first arc-shaped dewatering surface. The second arc-shaped dewatering surface is configured to receive the material at the lower end of the first dewatering screen, so that the material input from the upper end of the second arc-shaped dewatering surface flows naturally to the lower end under its own weight and is then thrown out. The second arc-shaped dewatering surface is provided with a plurality of dewatering holes.

[0008] In one embodiment of this disclosure, a first preset gap is provided in the horizontal direction between the upper end of the second arc-shaped dehydration surface and the lower end of the first arc-shaped dehydration surface, and the first preset gap is configured to allow the material to be discharged along the tangent of the lower end of the first arc-shaped dehydration surface while preventing the material from splashing out.

[0009] The upper end of the second arc-shaped dehydration surface is lower than the lower end of the first arc-shaped dehydration surface in the vertical direction, and the height difference between the upper end of the second arc-shaped dehydration surface and the lower end of the first arc-shaped dehydration surface is set as a second preset gap. It is configured such that when the material is discharged along the tangent of the lower end of the first arc-shaped dehydration surface, it falls onto the upper part of the second arc-shaped dehydration surface.

[0010] In one embodiment of this disclosure, the first preset gap is 10-20cm.

[0011] In one embodiment of this disclosure, the second preset gap is 25-35cm.

[0012] In one embodiment of this disclosure, the angle between the center line connecting the upper and lower ends of the first arc-shaped dehydration surface and the horizontal plane is a first angle, and the size of the first angle is 0-30°.

[0013] In one embodiment of this disclosure, the angle between the center line connecting the upper and lower ends of the second arc-shaped dehydration surface and the horizontal plane is the second included angle, and the size of the second included angle is 0-30°.

[0014] In one embodiment of this disclosure, the first arc-shaped dehydration surface and the second arc-shaped dehydration surface are two identical arc surfaces.

[0015] In one embodiment of this disclosure, the radius R of the arc surface is 1500-2000 mm, and the central angle θ is 90°-100°.

[0016] In one embodiment of this disclosure, the first dewatering screen further includes a first support, on which a plurality of screen bars are arranged at intervals perpendicular to the material movement direction, and the upper surfaces of the plurality of screen bars together form the first arc-shaped dewatering surface.

[0017] The second dewatering screen also includes a second support, on which a plurality of screen bars are arranged at intervals perpendicular to the material movement direction, and the upper surfaces of the plurality of screen bars together form the second arc-shaped dewatering surface;

[0018] The dewatering holes are formed between two adjacent screen bars.

[0019] In one embodiment of this disclosure, the width of the dehydration hole is 0.3-1 mm.

[0020] One of the beneficial effects of this disclosure is that the dewatering device of this disclosure, by setting a first dewatering screen and a second dewatering screen arranged in sequence along the vertical direction, dewaters the material through the first arc-shaped dewatering surface of the first dewatering screen, so that the material input from the upper end flows naturally to the lower end under its own weight and is then thrown out. Then, the second arc-shaped dewatering surface of the second dewatering screen receives the material discharged from the lower end of the first dewatering screen, so that the material input from the upper end flows naturally to the lower end under its own weight and is then thrown out, and dewaters the material again.

[0021] In this way, when the dewatering device of this disclosure is used, it can fully dewater the incoming material and avoid material accumulation on the first and second dewatering screens. The material can effectively contact the first and second arc-shaped dewatering surfaces, which improves the utilization rate of the first and second dewatering screens of this disclosure and reduces the downstream processing burden. Attached Figure Description

[0022] Embodiments of this disclosure are illustrated in conjunction with the accompanying drawings, which are included and form part of this specification, and together with their description serve to explain the principles of this disclosure.

[0023] Figure 1 This is a schematic diagram of the heavy media coal preparation system;

[0024] Figure 2 This is a schematic diagram of the structure of a dehydration device according to an embodiment of the present disclosure.

[0025] Figures 1 to 2 The correspondence between the component names and the reference numerals in the figures is as follows:

[0026] 01 Heavy medium cyclone, 012 Feed inlet, 013 Clean coal outlet, 014 Pressure transmitter, 015 Medium gangue outlet, 02 Second-stage cyclone, 021 Medium coal outlet, 022 Gangue outlet, 03 Feeding trough, 04 Linear desliming screen.

[0027] 1. First dewatering screen; 11. First arc-shaped dewatering surface; 12. First support; a. First included angle;

[0028] 2 Second dewatering screen, 21 Second arc-shaped dewatering surface, 22 Second support, b Second included angle. Detailed Implementation

[0029] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0030] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0031] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0032] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0034] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0035] In this article, "first," "second," etc., are used only to distinguish one another, and not to indicate degree of importance, order, or prerequisite for each other.

[0036] In this document, terms such as “equal” and “same” are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.

[0037] It should be noted that when describing the structure and working principle of the dewatering device, please refer to the following for the direction of material movement: Figure 2 In this text, solid lines with arrows represent the movement path of materials, and dashed lines with arrows represent the flow path of the medium water. Furthermore, the vertical direction described in this text refers to the direction perpendicular to the horizontal plane.

[0038] Existing dewatering devices are generally arc-shaped screens. When the material particles produced by the material sorting equipment are large, material accumulates on the upper surface of the arc-shaped screen. To solve this problem, the current solution is to increase the overall tilt angle of the arc-shaped screen. While this can alleviate the problem of material accumulation on the surface of the arc-shaped screen, the high material flow rate means that a large amount of water will flow over the upper surface of the arc-shaped screen along with the material, weakening the screen's dewatering capacity and ultimately increasing the processing pressure on subsequent processes.

[0039] To address this, the present disclosure provides a dewatering device comprising at least two first dewatering screens and second dewatering screens arranged sequentially in a vertical direction. The first dewatering screen has a first arc-shaped dewatering surface configured to allow material input from its upper end to flow naturally to its lower end under its own weight and then be ejected. The first arc-shaped dewatering surface is provided with a plurality of dewatering holes. The second dewatering screen is disposed below the first dewatering screen and has a second arc-shaped dewatering surface with a curvature opposite to that of the first arc-shaped dewatering surface. The second arc-shaped dewatering surface is configured to receive material from the lower end of the first dewatering screen, allowing material input from its upper end to flow naturally to its lower end under its own weight and then be ejected. The second arc-shaped dewatering surface is provided with a plurality of dewatering holes.

[0040] In detail, the dewatering device of this disclosure arranges a first dewatering screen and a second dewatering screen in a vertical direction so that the first arc-shaped dewatering surface of the first dewatering screen dewaters the material, and then the second arc-shaped dewatering surface of the second dewatering screen receives the material discharged from the lower end of the first dewatering screen and dewaters the material again.

[0041] In this way, when the dewatering device of this disclosure is used, it can fully dewater the incoming material and avoid material accumulation on the first and second dewatering screens, thereby improving the utilization rate of the dewatering screens of this disclosure and reducing the downstream processing burden.

[0042] For ease of understanding, please refer to the following: Figures 1 to 2 The specific structure and working principle of the dehydration device provided in this disclosure will be described in detail with reference to the embodiments.

[0043] In one embodiment, this disclosure provides a dewatering device comprising at least two first dewatering screens 1 and second dewatering screens 2 arranged sequentially in a vertical direction. The first dewatering screen 1 has a first arc-shaped dewatering surface 11, which is configured to allow material input from its upper end to flow naturally to its lower end under its own weight and then be thrown out. The first arc-shaped dewatering surface 11 is provided with a plurality of dewatering holes. The second dewatering screen 2 is disposed below the first dewatering screen 1 and has a second arc-shaped dewatering surface 21, which has a curvature opposite to that of the first arc-shaped dewatering surface 11. The second arc-shaped dewatering surface 21 is configured to receive material from the lower end of the first dewatering screen 1, allowing material input from its upper end to flow naturally to its lower end under its own weight and then be thrown out. The second arc-shaped dewatering surface 21 is provided with a plurality of dewatering holes.

[0044] Combination Figure 2In this disclosure, the first dewatering screen 1 and the second dewatering screen 2 are arranged in a vertical direction. At the same time, the angles of the first dewatering screen 1 and the second dewatering screen 2 are adjusted so that the first arc-shaped dewatering surface 11 of the first dewatering screen 1 dewaters the material, so that the material input from the upper end flows naturally to the lower end under its own weight and is then thrown out. Then, the second arc-shaped dewatering surface 21 of the second dewatering screen 2 receives the material discharged from the lower end of the first dewatering screen 1, so that the material input from the upper end flows naturally to the lower end under its own weight and is then thrown out, and dewaters the material again.

[0045] When materials (such as coal slurry and mineral slurry) enter the screen surface, they will move closely against the first arc-shaped dewatering surface 11 due to centrifugal force. This flow mode ensures that the materials form a uniform flow layer on the first arc-shaped dewatering surface 11, avoids local accumulation or blockage, enhances the cutting effect of the screen bars on the materials, and makes it easier for fine-grained materials to be discharged through the dewatering holes.

[0046] Meanwhile, the second dewatering screen 2 is located below the first dewatering screen 1, and the second arc-shaped dewatering surface 21 has the opposite curvature direction to the first arc-shaped dewatering surface 11, thereby receiving the material discharged from the lower end of the first dewatering screen 1, preventing the material from splashing out, and allowing the material to continue moving along the second arc-shaped dewatering surface 21 for further dewatering, thereby improving the dewatering efficiency.

[0047] Further, see Figure 1 Heavy media coal preparation is a physical coal preparation method that utilizes density differences to efficiently separate coal. Its core principle is to use a suspension with a density between clean coal and gangue (or middlings) as a medium, employing Archimedes' principle to separate coal from impurities. First, the mixture of suspension and coal enters the heavy media hydrocyclone 01 through the raw coal inlet 012. A centrifugal force field is generated by the pressure transmitter 014, separating the coal into clean coal and middlings. The low-density clean coal moves towards the center and is discharged through the clean coal outlet 013; the high-density middlings sinks along the wall and is discharged from the middlings outlet 015 at the bottom. The middlings are then transported to the second-stage hydrocyclone 02, where they are further separated into middlings and gangue, discharged through the middlings outlet 021 and gangue outlet 022, respectively. Afterward, the separated clean coal, middlings, and gangue undergo further processing.

[0048] Furthermore, the gangue is dewatered, combined with... Figure 2In this disclosure, a feeding trough 03 is provided at the top of the first dewatering screen 1. The gangue separated by the two-stage hydrocyclone 02 enters the feeding trough 03 and falls onto the first dewatering screen 1, moving along the first arc-shaped dewatering surface 11 for dewatering. Afterward, the gangue flows naturally to the lower end under its own weight and is thrown out, then received by the second dewatering screen 2, falling onto the second arc-shaped dewatering surface 21 for further dewatering. In this way, compared with a single dewatering screen, the dewatering device of this disclosure dewaters the gangue more thoroughly. Compared with two dewatering screens arranged in sequence, the dewatering device of this disclosure has a compact structure. The cooperation between the first dewatering screen 1 and the second dewatering screen 2 can prevent material splashing, improve dewatering efficiency, and avoid the problems of gangue accumulation or cross-contamination (water and gangue moving together on the screen surface).

[0049] Optionally, the dewatering device of this disclosure may be provided with multiple dewatering screens arranged in sequence along the vertical direction. For example, an additional dewatering screen may be added to receive the material discharged from the lower end of the second dewatering screen 2, thereby further improving the dewatering effect of the dewatering device. Those skilled in the art can set the number of dewatering screens according to the actual application scenario, and this disclosure does not impose any restrictions.

[0050] See Figure 2 In one embodiment, a first preset gap is provided horizontally between the upper end of the second arc-shaped dehydration surface 21 and the lower end of the first arc-shaped dehydration surface 11. The first preset gap is configured to allow material to be discharged along the tangent of the lower end of the first arc-shaped dehydration surface 11 while preventing material from splashing out. The upper end of the second arc-shaped dehydration surface 21 is lower than the lower end of the first arc-shaped dehydration surface 11 in the vertical direction. The height difference between the upper end of the second arc-shaped dehydration surface 21 and the lower end of the first arc-shaped dehydration surface 11 is set as the second preset gap. It is configured so that when material is discharged along the tangent of the lower end of the first arc-shaped dehydration surface 11, it falls onto the upper part of the second arc-shaped dehydration surface 21.

[0051] In detail, the first dewatering screen 1 and the second dewatering screen 2 of this disclosure are arranged in sequence along the vertical direction, but their projections on the horizontal plane do not overlap. Furthermore, a first preset gap is provided in the horizontal direction between the lower end of the first arc-shaped dewatering surface 11 and the upper end of the second arc-shaped dewatering surface 21 to prevent material splashing.

[0052] When the material is discharged along the tangent at the lower end of the first arc-shaped dewatering surface 11, if the lower end of the first arc-shaped dewatering surface 11 and the upper end of the second arc-shaped dewatering surface 21 overlap or are close together on the horizontal plane, the material is very likely to splash when discharged, resulting in waste; if the distance between the lower end of the first arc-shaped dewatering surface 11 and the upper end of the second arc-shaped dewatering surface 21 on the horizontal plane is too large, the material will have difficulty falling onto the second arc-shaped dewatering surface 21 after being discharged from the lower end of the first arc-shaped dewatering surface 11.

[0053] Meanwhile, the upper end of the second arc-shaped dewatering surface 21 is lower than the lower end of the first arc-shaped dewatering surface 11 in the vertical direction. The height difference between the upper end of the second arc-shaped dewatering surface 21 and the lower end of the first arc-shaped dewatering surface 11 is set as the second preset gap. In this way, the material is discharged along the tangent of the lower end of the first arc-shaped dewatering surface 11 and moves in a parabolic trajectory, so that it can fall onto the upper part of the second arc-shaped dewatering surface 21.

[0054] When the material is discharged along the tangent at the lower end of the first arc-shaped dewatering surface 11, if the distance between the lower end of the first arc-shaped dewatering surface 11 and the upper end of the second arc-shaped dewatering surface 21 in the vertical direction is too far, the material will have difficulty falling onto the second arc-shaped dewatering surface 21 after being discharged from the lower end of the first arc-shaped dewatering surface 11. If the distance between the lower end of the first arc-shaped dewatering surface 11 and the upper end of the second arc-shaped dewatering surface 21 in the vertical direction is too close, the centrifugal force of the material on the second arc-shaped dewatering surface 21 will be small, the flow rate of the material will be slow, and the dewatering holes may become blocked due to excessive residence time.

[0055] See Figure 2 In one embodiment of this disclosure, the first preset gap is 10-20cm.

[0056] Specifically, the first preset gap between the lower end of the first arc-shaped dewatering surface 11 and the upper end of the second arc-shaped dewatering surface 21 is 10-20 cm. If the first preset gap is too small, material may get stuck between the first dewatering screen 1 and the second dewatering screen 2, causing material accumulation, affecting screening efficiency, or even causing blockage. Long-term accumulation of material may cause wear on the screen bars or even structural deformation. If the first preset gap is too large, it may reduce the effective contact area between the first arc-shaped dewatering surface 11 and the second arc-shaped dewatering surface 21, reduce the processing capacity per unit area, and increase the floor space occupied by the dewatering device.

[0057] Meanwhile, setting a first preset gap facilitates installation and assembly, reducing the difficulty of manual or mechanical assembly. Moreover, the first preset gap can absorb the instantaneous impact force when the material falls, reducing the direct collision between the material and the second arc-shaped dewatering surface 21, thereby reducing material splashing and improving operational stability.

[0058] See Figure 2 In one embodiment of this disclosure, the second preset gap is 25-35cm.

[0059] Specifically, the second preset gap between the upper end of the second arc-shaped dewatering surface 21 and the lower end of the first arc-shaped dewatering surface 11 is 25-35 cm. If the second preset gap is too small, excessively large materials may get stuck between the first dewatering screen 1 and the second dewatering screen 2, causing the materials to accumulate on the first dewatering screen 1; if the second preset gap is too large, when the materials fall onto the second dewatering screen 2, the impact on the second arc-shaped dewatering surface 21 will be greater, which may cause the structure of the second arc-shaped dewatering surface 21 to deform over time, reducing the service life of the second dewatering screen 2.

[0060] See Figure 2 In one embodiment of this disclosure, the angle between the center line connecting the upper and lower ends of the first arc-shaped dehydration surface 11 and the horizontal plane is the first included angle α, and the size of the first included angle α is 0-30°.

[0061] In detail, the angle between the center line connecting the upper and lower ends of the first arc-shaped dewatering surface 11 and the horizontal plane is the first included angle α, which is the tilt angle of the entire screen body relative to the horizontal plane after installation, that is, the installation angle of the first dewatering screen 1 of this disclosure. The size of the first included angle α in this disclosure is 0-30°. When the material moves along the first arc-shaped dewatering surface 11, it is driven by the component of gravity. The first included angle α in this disclosure is relatively small, and the corresponding component of gravity is also small, so the movement speed of the material is reduced. Therefore, the material stays on the first arc-shaped dewatering surface 11 for a longer time, and the material effectively contacts the surface of the first dewatering screen 1. At the same time, the lower end of the first arc-shaped dewatering surface 11 is close to horizontal, and the thickness of the material flow layer tends to be uniform. When the material is discharged from the lower end of the first dewatering screen 1, it moves in a near parabolic motion, so that the material can fall evenly on the upper part of the second dewatering screen 2.

[0062] See Figure 2 In one embodiment of this disclosure, the angle between the center line connecting the upper and lower ends of the second arc-shaped dehydration surface 21 and the horizontal plane is the second included angle b, and the size of the second included angle b is 0-30°.

[0063] In detail, the angle between the center line connecting the upper and lower ends of the second arc-shaped dewatering surface 21 and the horizontal plane is the second included angle b, which is the inclination angle of the entire screen body relative to the horizontal plane after installation, that is, the installation angle of the second dewatering screen 2 of this disclosure. The size of the second included angle b of this disclosure is 0-30°. When the material moves along the second arc-shaped dewatering surface 21, it is driven by the component of gravity. The second included angle b of this disclosure is small, and the corresponding component of gravity is also small, so the movement speed of the material is reduced. Therefore, the material stays on the second arc-shaped dewatering surface 21 for a longer time, and the material effectively contacts the surface of the second dewatering screen 2. At the same time, the lower end of the second arc-shaped dewatering surface 21 is close to horizontal, the thickness of the material flow layer tends to be uniform, and the material can fall evenly onto the subsequent linear dewatering screen 04.

[0064] In one embodiment, the first included angle α of this disclosure is 0-30°, and the second included angle b of this disclosure is 0-30°. The sizes of the first included angle α and the second included angle b must ensure that the material flows smoothly on the first arc-shaped dewatering surface 11 and the second arc-shaped dewatering surface 21, avoiding material accumulation or blockage. By coordinating the central angle and radius of the first arc-shaped dewatering surface 11 and the second arc-shaped dewatering surface 21, efficient dewatering of the material is achieved through the synergistic effect of centrifugal force and gravity.

[0065] In this way, the first included angle a and the second included angle b are the same size, and the dewatering efficiency and processing capacity of the material on the first arc-shaped dewatering surface 11 and the second arc-shaped dewatering surface 21 are more balanced, reducing the complexity of manufacturing and installation of the first dewatering screen 1 and the second dewatering screen 2. At the same angle, the wear distribution of the first arc-shaped dewatering surface 11 and the second arc-shaped dewatering surface 21 is similar, which facilitates unified maintenance.

[0066] Alternatively, the first included angle a and the second included angle b of this disclosure may be different in size. Those skilled in the art can set the installation angle of the first dewatering screen 1 and the second dewatering screen 2 according to the actual application scenario. This disclosure does not impose any restrictions on this.

[0067] See Figure 2 In one embodiment of this disclosure, the first arc-shaped dehydration surface 11 and the second arc-shaped dehydration surface 21 are two identical arc surfaces.

[0068] The first arc-shaped dewatering surface 11 and the second arc-shaped dewatering surface 21 are circular arc surfaces, which make the material move in a parabolic trajectory on the first arc-shaped dewatering surface 11 and the second arc-shaped dewatering surface 21. This ensures that the material is evenly distributed on the first arc-shaped dewatering surface 11 and the second arc-shaped dewatering surface 21, avoiding accumulation or local overload, thereby improving screening efficiency. When the material flows on the circular arc surface, it is subjected to the combined action of gravity and centrifugal force and moves closely to the dewatering surface.

[0069] The lower layer of material near the screen bars, due to its lower velocity, is cut and separated into fine particles (smaller particle sizes) by the edges of the screen bars. This cutting action breaks down the surface water tension of the material, promoting rapid passage of fine particles (such as coal slime) through the screen and reducing the risk of clogging. Furthermore, the arc surface increases the effective length of the first arc-shaped dewatering surface 11 and the second arc-shaped dewatering surface 21, allowing the material to remain on these surfaces for a longer time, which helps the fine particles pass through the screen more fully.

[0070] See Figure 2 In one embodiment of this disclosure, the radius R of the arc surface is 1500-2000mm, and the central angle θ is 90°-100°.

[0071] In detail, the radius R of the arc surface of the first dewatering screen 1 and the second dewatering screen 2 of this disclosure is 1500-2000mm, and the central angle θ is 90°-100°. The radius and central angle adopted in this disclosure are larger than those commonly used in the coal washing field (radius of 400-1000mm, central angle of 45°~90°), thereby improving the processing capacity of the dewatering device, increasing the effective length of the first arc-shaped dewatering surface 11 and the second arc-shaped dewatering surface 21, extending the material residence time, promoting material passage through the screen, and while providing centrifugal force, the first arc-shaped dewatering surface 11 and the second arc-shaped dewatering surface 21 are more gentle, the material residence time is longer, reducing wear and extending service life. In addition, the dewatering device has a larger volume but a longer maintenance cycle, making it suitable for long-term stable operation.

[0072] See Figure 2 In one embodiment of this disclosure, the first dewatering screen 1 further includes a first support 12, on which a plurality of screen bars are arranged at intervals perpendicular to the material movement direction, and the upper surfaces of the plurality of screen bars together form a first arc-shaped dewatering surface 11; the second dewatering screen 2 further includes a second support 22, on which a plurality of screen bars are arranged at intervals perpendicular to the material movement direction, and the upper surfaces of the plurality of screen bars together form a second arc-shaped dewatering surface 21; a dewatering hole is formed between two adjacent screen bars.

[0073] In detail, several screen bars are fixedly installed on the first support 12. These screen bars are perpendicular to the material movement direction and are arranged in sequence at intervals. The upper surfaces of the screen bars together form a first arc-shaped dewatering surface 11. Optionally, baffles can also be fixedly installed on both sides of the first arc-shaped dewatering surface 11 to prevent material from splashing out of the first dewatering screen 1.

[0074] The continuous transverse grooves between two adjacent screen bars serve as dewatering holes, forcing liquids (such as water or media) to flow laterally along these holes. Driven by capillary action and gravity, the liquid passes quickly through the holes, reducing residence time. Furthermore, the movement of material on the first dewatering screen 1 can grind chamfers into the screen bars, effectively extending the residence time of water on the first arc-shaped dewatering surface 11 and improving the separation efficiency of water and solid particles. When the material slides down the first arc-shaped dewatering surface 11 under gravity, the chamfered structure generates lateral resistance, forcing the material to roll rather than slide on the surface. This rolling motion reduces direct friction between the material and the first arc-shaped dewatering surface 11; and the impact force generated during the rolling process effectively removes fine-grained impurities (such as coal slime and clay) adhering to the dewatering holes, thereby reducing the risk of clogging.

[0075] Meanwhile, several screen bars are fixedly installed on the second support 22. These screen bars are perpendicular to the material movement direction and are arranged in sequence at intervals. The upper surfaces of the screen bars together form the second arc-shaped dewatering surface 21. Optionally, baffles can also be fixedly installed on both sides of the second arc-shaped dewatering surface 21 to prevent material from splashing out of the second dewatering screen 2.

[0076] The continuous transverse grooves between two adjacent screen bars serve as dewatering holes, forcing liquids (such as water or media) to flow laterally along these holes. Driven by capillary action and gravity, the liquid passes quickly through the holes, reducing residence time. Furthermore, the movement of material on the second dewatering screen 2 can grind chamfers on the screen bars, effectively extending the residence time of water on the second arc-shaped dewatering surface 21 and improving the separation efficiency of water and solid particles. When the material slides down the second arc-shaped dewatering surface 21 under gravity, the chamfered structure generates lateral resistance, forcing the material to roll rather than slide on the surface. This rolling motion reduces direct friction between the material and the second arc-shaped dewatering surface 21; and the impact force generated during the rolling process effectively removes fine-grained impurities (such as coal slime and clay) adhering to the dewatering holes, thereby reducing the risk of clogging.

[0077] See Figure 2 In one embodiment of this disclosure, the width of the dehydration hole is 0.3-1 mm.

[0078] In detail, narrower dewatering holes can prolong the residence time of gangue on the screen surface, improving dewatering efficiency, while wider dewatering holes allow the medium to pass through the screen quickly. Combined with high-pressure spraying, this improves the medium recovery rate and significantly reduces production costs.

[0079] Optionally, a gradual dewatering hole design can be adopted (for example, the width of the dewatering hole gradually increases along the material movement direction) to achieve the step-by-step separation of the medium and gangue, improve the recycling efficiency, and with a dewatering hole range of 0.3-1mm, the first dewatering screen 1 and the second dewatering screen 2 can simultaneously process coarse gangue and fine gangue containing mud, avoiding clogging or leakage problems caused by a single dewatering hole.

[0080] The working principle of the dewatering device disclosed herein will be further explained next using an application scenario of gangue dewatering.

[0081] First, see Figure 1 The mixture of suspension and coal enters the heavy medium cyclone 01 through the raw coal inlet 012. The centrifugal force field generated by the pressure transmitter 014 separates it into clean coal and middlings. The low-density clean coal moves towards the center and is discharged through the clean coal outlet 013. The high-density middlings sinks along the wall and is discharged from the middlings outlet 015 at the bottom. The middlings are transported to the second-stage cyclone 02, where they are further separated into middlings and gangue and discharged through the middlings outlet 021 and gangue outlet 022, respectively.

[0082] Furthermore, the dewatering device disclosed herein is used to dewater gangue. The central angle between the first arc-shaped dewatering surface 11 and the second arc-shaped dewatering surface 21 of this disclosure is 96°, the radius is 1704 mm, and the arc length is 2829 mm.

[0083] See Figure 2 In this disclosure, a feeding trough 03 is provided at the top of the first dewatering screen 1. The gangue separated by the two-stage hydrocyclone 02 enters the feeding trough 03 and falls onto the first dewatering screen 1, moving along the first arc-shaped dewatering surface 11 for dewatering. It is then discharged along the lower tangent of the first arc-shaped dewatering surface 11 and received by the second dewatering screen 2, falling onto the second arc-shaped dewatering surface 21 for further dewatering. The gangue is then discharged along the lower tangent of the second arc-shaped dewatering surface 21 and falls onto the linear desliming screen 04 for desliming. Any remaining moisture on the gangue is also removed by the linear desliming screen 04. Furthermore, a collection box is provided below the first dewatering screen 1 and the second dewatering screen 2 to collect the medium water flowing down from the dewatering holes and transport it through pipelines to the desliming stage for medium recovery.

[0084] Thus, compared to a single dewatering screen, the dewatering device of this disclosure dewaters gangue more thoroughly. Compared to two dewatering screens arranged in sequence, the dewatering device of this disclosure has a compact structure. The first dewatering screen 1 and the second dewatering screen 2 work together to prevent material splashing and improve dewatering efficiency. Adjusting the first included angle a and the second included angle b avoids the problems of gangue accumulation or cross-contamination (water and gangue moving together on the screen surface), reducing the downstream processing burden.

[0085] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this disclosure is defined by the appended claims.

Claims

1. A dehydration device, characterized in that, The dewatering device includes at least two first dewatering screens (1) and second dewatering screens (2) arranged sequentially in a vertical direction: The first dewatering screen (1) has a first arc-shaped dewatering surface (11), and the first arc-shaped dewatering surface (11) is configured to allow the material input from the upper end of the first arc-shaped dewatering surface (11) to flow naturally to the lower end under its own weight and then be thrown out. The first arc-shaped dewatering surface (11) is provided with a plurality of dewatering holes. The second dewatering screen (2) is located below the first dewatering screen (1) and has a second arc-shaped dewatering surface (21). The second arc-shaped dewatering surface (21) has the opposite curvature direction to the first arc-shaped dewatering surface (11). The second arc-shaped dewatering surface (21) is configured to receive the material at the lower end of the first dewatering screen (1) and allow the material input from the upper end of the second arc-shaped dewatering surface (21) to flow naturally to the lower end under its own weight and then be thrown out. The second arc-shaped dewatering surface (21) is provided with a plurality of dewatering holes.

2. The dehydration device according to claim 1, characterized in that, A first preset gap is provided in the horizontal direction between the upper end of the second arc-shaped dehydration surface (21) and the lower end of the first arc-shaped dehydration surface (11), and the first preset gap is configured to allow the material to be discharged along the tangent of the lower end of the first arc-shaped dehydration surface (11) while preventing the material from splashing out. The upper end of the second arc-shaped dehydration surface (21) is lower than the lower end of the first arc-shaped dehydration surface (11) in the vertical direction, and the height difference between the upper end of the second arc-shaped dehydration surface (21) and the lower end of the first arc-shaped dehydration surface (11) is set as a second preset gap. It is configured such that when the material is discharged along the tangent of the lower end of the first arc-shaped dehydration surface (11) and falls onto the upper part of the second arc-shaped dehydration surface (21).

3. The dehydration device according to claim 2, characterized in that, The first preset gap is 10-20cm.

4. The dehydration device according to claim 2, characterized in that, The second preset gap is 25-35cm.

5. The dehydration device according to claim 2, characterized in that, The angle between the center line connecting the upper and lower ends of the first arc-shaped dehydration surface (11) and the horizontal plane is the first included angle (a), and the size of the first included angle (a) is 0-30°.

6. The dehydration device according to claim 2, characterized in that, The angle between the center line connecting the upper and lower ends of the second arc-shaped dehydration surface (21) and the horizontal plane is the second included angle (b), and the size of the second included angle (b) is 0-30°.

7. The dehydration apparatus according to any one of claims 2 to 6, characterized in that, The first arc-shaped dehydration surface (11) and the second arc-shaped dehydration surface (21) are two identical arc surfaces.

8. The dehydration apparatus according to claim 7, characterized in that, The radius R of the arc surface is 1500-2000mm, and the central angle θ is 90°-100°.

9. The dehydration apparatus according to claim 7, characterized in that, The first dewatering screen (1) further includes a first support (12), on which a plurality of screen bars are arranged at intervals perpendicular to the material movement direction, and the upper surfaces of the plurality of screen bars together form the first arc-shaped dewatering surface (11). The second dewatering screen (2) also includes a second support (22), on which a plurality of screen bars are arranged at intervals perpendicular to the material movement direction, and the upper surfaces of the plurality of screen bars together form the second arc-shaped dewatering surface (21). The dewatering holes are formed between two adjacent screen bars.

10. The dehydration apparatus according to claim 9, characterized in that, The width of the dehydration hole is 0.3-1mm.

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