A coal mine underground raw coal dewatering system

Abstract

This utility model discloses a coal mine underground raw coal dewatering system, comprising: a first raw coal conveyor; a second raw coal conveyor disposed below the unloading end of the first raw coal conveyor, forming an installation space between the first and second raw coal conveyors; a primary roller deep dewatering screen disposed within the installation space, with the inlet end of the primary roller deep dewatering screen connected to the unloading end of the first raw coal conveyor, and the oversize discharge end of the primary roller deep dewatering screen correspondingly disposed above the second raw coal conveyor; a secondary vibrating dewatering screen disposed within the installation space, located below the primary roller deep dewatering screen, with the inlet end of the secondary vibrating dewatering screen connected to the undersize discharge end of the primary roller deep dewatering screen, and the oversize discharge end of the secondary vibrating dewatering screen correspondingly disposed above the second raw coal conveyor; and a coal slurry pool, with the undersize discharge end of the secondary vibrating dewatering screen connected to the coal slurry pool.

Description

Technical Field

[0001] This utility model relates to the field of raw coal dewatering technology, specifically to a raw coal dewatering system for underground coal mines. Background Technology

[0002] Coal is a crucial basic energy source and industrial raw material in my country. During coal mining, raw coal typically contains a high amount of moisture, primarily originating from water within the coal seam itself, dust suppression spraying underground, and water seepage during the mining process. High moisture content in raw coal not only increases inefficient transportation and energy consumption but also makes it highly susceptible to freezing in trucks and storage containers, especially in cold winter regions, severely impacting transportation efficiency and loading / unloading operations. Furthermore, excessive moisture reduces the calorific value of coal, affecting its subsequent washing, processing, and utilization efficiency. Therefore, effective dehydration of raw coal from underground mines is a critical step in coal production.

[0003] Traditional coal mine dewatering processes are relatively simple and rudimentary, typically employing only a single-stage dewatering screen (such as a vibrating screen or roller screen). This single-stage dewatering method has significant drawbacks: for lump coal and larger particles, surface moisture is difficult to remove completely; and for fine coal slurry, the processing capacity of a single-layer screen is limited, resulting in the loss of large amounts of fine coal slurry with the underflow, wasting coal resources and increasing the burden on mine water treatment. High concentrations of coal slurry in the underflow can also clog drainage ditches, worsening the underground working environment.

[0004] Existing technologies have attempted to combine different dewatering devices, but these solutions often suffer from unreasonable layouts, large equipment footprints, and difficulty adapting to the confined and complex environments of underground mines. For example, horizontally arranging multi-stage screening equipment significantly increases the system length and occupies valuable tunnel space; while multi-level vertical arrangements often suffer from insufficient unloading height, poor material flow between devices, and limited maintenance space. Optimizing equipment layout and constructing a compact, efficient, stable dewatering system suitable for confined underground spaces without compromising dewatering efficiency has become a pressing technical challenge in this field.

[0005] Therefore, there is an urgent need for a new type of underground coal dewatering system that can achieve deep and efficient dewatering of raw coal, while ensuring a compact system structure and reliable operation to adapt to the harsh underground environment. In view of this, this utility model is proposed. Utility Model Content

[0006] To address the aforementioned problems, this utility model proposes a coal dewatering system for underground coal mines, specifically employing the following technical solution:

[0007] A coal dewatering system for underground coal mines, comprising:

[0008] First raw coal conveyor;

[0009] The second raw coal conveyor is located below the unloading end of the first raw coal conveyor, and an installation space is formed between the first raw coal conveyor and the second raw coal conveyor.

[0010] A primary roller deep dewatering screen is installed in the installation space. The feed end of the primary roller deep dewatering screen is connected to the discharge end of the first raw coal conveyor, and the oversize discharge end of the primary roller deep dewatering screen is correspondingly located above the second raw coal conveyor.

[0011] A secondary vibrating dewatering screen is installed in the installation space and located below the primary roller depth dewatering screen. The feed end of the secondary vibrating dewatering screen is connected to the undersize discharge end of the primary roller depth dewatering screen, and the oversize discharge end of the secondary vibrating dewatering screen is correspondingly located above the second raw coal conveyor.

[0012] The coal slime pit is connected to the discharge end of the undersize material from the secondary vibrating dewatering screen.

[0013] As an optional embodiment of this utility model, a coal mine underground raw coal dewatering system of this utility model includes a first raw coal conveyor comprising a first conveying roller group and an unloading drum, and a second raw coal conveyor comprising a second conveying roller group and a redirecting drum.

[0014] The coal mine underground raw coal dewatering system includes a conveyor belt, which is laid horizontally on the first conveyor roller group, extends to the unloading roller and is redirected to the redirecting roller, and then redirected again by the redirecting roller and laid horizontally on the second conveyor roller group, so that the conveyor belt forms an S-shaped conveying path;

[0015] An installation space is formed between the horizontal conveyor belt segment laid on the first conveyor roller group and the horizontal conveyor belt segment laid on the second conveyor roller group.

[0016] As an optional embodiment of this utility model, in a coal mine underground raw coal dewatering system, the unloading drum end of the first raw coal conveyor is the unloading end, and the feed end of the primary roller depth dewatering screen is connected to the unloading drum.

[0017] As an optional embodiment of this utility model, a coal mine underground raw coal dewatering system of this utility model includes an installation bracket, the installation bracket having a first installation platform and a second installation platform with different heights, the first-stage roller depth dewatering screen being fixedly installed on the first installation platform, and the second-stage vibrating dewatering screen being fixedly installed on the second installation platform.

[0018] As an optional embodiment of this utility model, in a coal mine underground raw coal dewatering system of this utility model, the screen gap of the primary roller depth dewatering screen is ≤3mm; and the screen gap of the secondary vibrating dewatering screen is 0.2-0.15mm.

[0019] As an optional embodiment of this utility model, a coal mine underground raw coal dewatering system of this utility model includes a primary roller deep dewatering screen comprising a screen body, in which multiple screen shafts are arranged in parallel. Each screen shaft is independently driven to rotate by its own drive motor. Multiple wear-resistant screen plates are fixedly arranged on each screen shaft. The wear-resistant screen plates on adjacent screen shafts are staggered, and the screen gaps of the primary roller deep dewatering screen are formed between adjacent wear-resistant screen plates.

[0020] As an optional embodiment of this utility model, a coal mine underground raw coal dewatering system of this utility model includes a secondary vibrating dewatering screen comprising a screen frame, a screen plate disposed at the bottom of the screen frame, and a vibrator for driving the screen frame to vibrate and dewater, wherein the screen plate forms a screen gap between the screen plates.

[0021] As an optional embodiment of this utility model, a coal mine underground raw coal dewatering system includes a three-stage resonant dewatering screen. A submersible slurry pump is installed in the coal slurry pool. The submersible slurry pump is connected to the feed end of the three-stage resonant dewatering screen. The discharge end of the oversize material of the three-stage resonant dewatering screen is correspondingly located above the second raw coal conveyor. The discharge end of the undersize material of the three-stage resonant dewatering screen is connected to a drainage ditch.

[0022] As an optional embodiment of this utility model, a coal mine underground raw coal dewatering system of this utility model includes a three-stage resonant dewatering screen comprising a screen box, at least one layer of screen mesh disposed at the bottom of the screen box, and a cylindrical explosion-proof motor for driving the screen box to resonate and dewater.

[0023] As an optional embodiment of this utility model, in a coal mine underground raw coal dewatering system of this utility model, the screen mesh has a mesh size of 0.075mm to 0.15mm.

[0024] Due to limited underground space, the first and second raw coal conveyors are staggered in height to create installation space for the raw coal dewatering equipment. The secondary vibrating dewatering screen is located below the primary roller-driven deep dewatering screen. The raw coal unloaded from the first raw coal conveyor is fed into the primary roller-driven deep dewatering screen, and the oversize material falls directly onto the second raw coal conveyor. The undersize coal slurry from the primary roller-driven deep dewatering screen is directly collected at the feed end of the secondary vibrating dewatering screen. The oversize material from the secondary vibrating dewatering screen is also fed onto the lower second raw coal conveyor, while the undersize coal slurry from the secondary vibrating dewatering screen flows through a trough to the coal slurry pit on the side of the roadway.

[0025] Therefore, the coal mine underground raw coal dewatering system provided by this utility model has the following significant advantages and technical effects:

[0026] This system achieves deep and fine dewatering of raw coal, significantly improving dewatering efficiency. It employs a two-stage synergistic dewatering mode: a primary roller-driven deep dewatering screen and a secondary vibrating dewatering screen. The primary roller-driven deep dewatering screen effectively breaks up coal slurry lumps and removes surface water from large coal particles; the secondary vibrating dewatering screen utilizes its high-frequency vibration to force dewater fine particles. This combined process overcomes the limitations of single dewatering equipment, achieving efficient dewatering of raw coal with a wide particle size range and significantly reducing the total moisture content of the final product.

[0027] The system achieves coal slime recycling, improves coal resource utilization, and reduces environmental pollution. It features a dedicated coal slime pond and subsequent treatment process, capable of collecting high-concentration coal slime water from the secondary vibrating dewatering screen and transporting it to subsequent equipment for recycling. This effectively prevents fine coal slime from being lost with the water, improving economic efficiency and reducing the content of suspended solids in mine water at the source, thus alleviating the load on the mine water treatment system and reducing pollution to the underground environment.

[0028] The system layout is extremely compact, making full use of the underground three-dimensional space and saving roadway floor space. This utility model creatively utilizes the "installation space" formed by the height difference between the first and second raw coal conveyors to arrange the primary roller depth dewatering screen and the secondary vibrating dewatering screen in an overlapping manner. This vertically stacked layout integrates two sets of dewatering equipment with almost no additional horizontal area occupied, perfectly adapting to the special working conditions of narrow underground roadways in coal mines and the stringent requirements for equipment layout dimensions, thus resolving the contradiction between efficient dewatering technology and limited space layout.

[0029] The smooth material flow and low energy consumption create a highly efficient and continuous dewatering process: the entire system relies on height differences to achieve gravity flow or short-distance transport of materials. Raw coal naturally falls from the first raw coal conveyor to the primary roller depth dewatering screen. The oversize material from the primary roller depth dewatering screen falls directly to the second raw coal conveyor, while the undersize material naturally falls to the secondary vibrating dewatering screen below. The oversize material from the secondary vibrating dewatering screen also falls directly to the second raw coal conveyor. The material flow path is clear and smooth, requiring no or reducing additional transfer and lifting equipment. This not only reduces system energy consumption but also reduces dust and potential failure points at transfer points, ensuring the continuity and reliability of production operations.

[0030] The structure is reasonable and easy to maintain: the functions of each level of equipment are clearly defined and the layout is hierarchical. Although the structure is compact, by placing the secondary vibrating dewatering screen below the primary roller depth dewatering screen, mutual interference between the two different motion modes of equipment is avoided, while also leaving the necessary space for equipment inspection and maintenance.

[0031] By introducing a three-stage resonant dewatering screen and implementing closed-loop treatment of coal slurry water, a complete closed-loop treatment and clean water recycling system for coal slurry water has been achieved, resulting in significant environmental benefits. The system completely solves the problem of treating fine coal slurry water through a complete process chain of "coal slurry pool collection → submersible slurry pump transportation → three-stage resonant dewatering screen recovery." The undersize material from the three-stage resonant dewatering screen is deeply clarified clean water, which can be directly discharged into the drainage ditch for underground dust suppression spraying or as other production water, realizing the recycling of water resources. This not only greatly reduces the fresh water consumption of the mine but also fundamentally eliminates the pollution of underground roadways and the working environment caused by the direct discharge of coal slurry water, resulting in extremely outstanding environmental benefits.

[0032] In summary, the coal mine underground raw coal dewatering system provided in this embodiment successfully integrates efficient dewatering technology, resource recovery, and space-efficient design, effectively solving a series of problems existing in traditional underground dewatering methods, such as incomplete dewatering, coal slime loss, and large land occupation. It has extremely high practical value and promising prospects for promotion. Attached image description:

[0033] Figure 1 A system schematic diagram of an underground raw coal dewatering system in a coal mine according to Embodiment 1 of this utility model;

[0034] Figure 2 A front view of one embodiment of the wear-resistant screen plate of a roller dewatering screen according to Embodiment 2 of this utility model;

[0035] Figure 3 The wear-resistant screen plates of a roller dewatering screen according to Embodiment 2 of this utility model are as follows: Figure 2 Cross-sectional view of surface AA;

[0036] Figure 4 The wear-resistant screen plates of a roller dewatering screen according to Embodiment 2 of this utility model are as follows: Figure 2 A magnified view of a section at point B in the middle;

[0037] Figure 5 A front view of another embodiment of the wear-resistant screen plate of the roller dewatering screen according to Embodiment 2 of this utility model. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0039] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0040] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0041] 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 further defined and explained in subsequent figures.

[0042] In the description of this utility model, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] Example 1

[0044] See Figure 1 As shown in this embodiment, a coal mine underground raw coal dewatering system includes:

[0045] First raw coal conveyor 200;

[0046] The second raw coal conveyor 300 is located below the unloading end of the first raw coal conveyor 200, and an installation space is formed between the first raw coal conveyor 200 and the second raw coal conveyor 300.

[0047] A primary roller deep dewatering screen 400 is installed in the installation space. The feed end 401 of the primary roller deep dewatering screen 400 is connected to the discharge end of the first raw coal conveyor 200, and the oversize discharge end 402 of the primary roller deep dewatering screen 400 is correspondingly located above the second raw coal conveyor 300.

[0048] A secondary vibrating dewatering screen 500 is installed in the installation space and located below the primary roller depth dewatering screen 400. The feed end 501 of the secondary vibrating dewatering screen 500 is connected to the undersize discharge end 403 of the primary roller depth dewatering screen 400, and the oversize discharge end 502 of the secondary vibrating dewatering screen 500 is correspondingly located above the second raw coal conveyor 300.

[0049] The coal slime tank 600 is connected to the undersize discharge end 503 of the secondary vibrating dewatering screen 500.

[0050] Due to limited underground space, the first raw coal conveyor 200 and the second raw coal conveyor 300 are staggered in height to create installation space for the raw coal dewatering equipment. The secondary vibrating dewatering screen 500 is arranged below the primary roller depth dewatering screen 400. The raw coal material unloaded from the first raw coal conveyor 200 is fed into the primary roller depth dewatering screen 400, and the oversize material falls directly onto the second raw coal conveyor 300. The undersize coal slurry from the primary roller depth dewatering screen 400 is directly collected at the feed end 501 of the secondary vibrating dewatering screen 500. The oversize material from the secondary vibrating dewatering screen 500 is also fed onto the lower second raw coal conveyor 300, while the undersize coal slurry from the secondary vibrating dewatering screen 500 flows through a water trough to the coal slurry pit 600 on the side of the roadway.

[0051] Therefore, the coal mine underground raw coal dewatering system provided in this embodiment has the following significant advantages and technical effects:

[0052] This system achieves deep and fine dewatering of raw coal, significantly improving dewatering efficiency. It employs a two-stage synergistic dewatering mode: a 400-mesh primary roller deep dewatering screen and a 500-mesh secondary vibrating dewatering screen. The 400-mesh primary roller deep dewatering screen effectively breaks up coal slurry lumps and removes surface water from large coal particles; the 500-mesh secondary vibrating dewatering screen utilizes its high-frequency vibration to force dewater fine particles. This combined process overcomes the limitations of single dewatering equipment, achieving efficient dewatering of raw coal with a wide particle size range and significantly reducing the total moisture content of the final product.

[0053] The system achieves coal slime recycling, improves coal resource utilization, and reduces environmental pollution. It features a dedicated 600-ton coal slime pit and subsequent treatment processes, capable of collecting high-concentration coal slime water from the 500-ton vibrating dewatering screen and transporting it to subsequent equipment for recycling. This effectively prevents fine coal slime from being lost with the water, improving economic efficiency and reducing the content of suspended solids in mine water at the source, thus alleviating the load on the mine water treatment system and reducing pollution to the underground environment.

[0054] The system layout is extremely compact, making full use of the underground three-dimensional space and saving roadway floor space. This utility model creatively utilizes the "installation space" formed by the height difference between the first raw coal conveyor 200 and the second raw coal conveyor 300 to arrange the primary roller depth dewatering screen 400 and the secondary vibrating dewatering screen 500 vertically overlapping. This vertically stacked layout integrates two sets of dewatering equipment with almost no additional horizontal area occupied, perfectly adapting to the special working conditions of narrow underground roadways in coal mines and the stringent requirements for equipment layout dimensions, thus resolving the contradiction between efficient dewatering technology and limited space layout.

[0055] The smooth material flow and low energy consumption create a highly efficient and continuous dewatering process: the entire system relies on height differences to achieve gravity flow or short-distance transport of materials. Raw coal naturally falls from the first raw coal conveyor 200 to the first-stage roller depth dewatering screen 400. The material oversizes from the first-stage roller depth dewatering screen 400 directly falls to the second raw coal conveyor 300, while the material undersizes naturally falls to the second-stage vibrating dewatering screen 500 below. The material oversizes from the second-stage vibrating dewatering screen 500 also directly fall to the second raw coal conveyor 300. The material flow path is clear and smooth, requiring no or reducing additional transfer and lifting equipment. This not only reduces system energy consumption but also reduces dust and potential failure points at transfer points, ensuring the continuity and reliability of production operations.

[0056] The structure is reasonable and easy to maintain: the functions of each level of equipment are clearly defined and the layout is hierarchical. Although the structure is compact, by placing the secondary vibrating dewatering screen 500 below the primary roller depth dewatering screen 400, mutual interference between the two different motion modes of the equipment is avoided, while also leaving the necessary space for equipment inspection and maintenance.

[0057] In summary, the coal mine underground raw coal dewatering system provided in this embodiment successfully integrates efficient dewatering technology, resource recovery, and space-efficient design, effectively solving a series of problems existing in traditional underground dewatering methods, such as incomplete dewatering, coal slime loss, and large land occupation. It has extremely high practical value and promising prospects for promotion.

[0058] In this embodiment, a coal mine underground raw coal dewatering system is provided. To fully utilize the underground space, the first raw coal conveyor 200 includes a first conveying roller group 201 and an unloading roller 202, and the second raw coal conveyor 300 includes a second conveying roller group 301 and a redirecting roller 302. The coal mine underground raw coal dewatering system includes a conveyor belt 100, which is laid horizontally on the first conveying roller group 201, extends to the unloading roller 202 and redirects to the redirecting roller 302, and then redirects again to lay horizontally on the second conveying roller group 301, so that the conveyor belt 100 forms an S-shaped conveying path. An installation space is formed between the horizontal conveyor belt section laid on the first conveying roller group 201 and the horizontal conveyor belt section laid on the second conveying roller group 301. In this embodiment, the underground conveyor belt 100 in the coal mine is redirected, thus creating a highly misaligned installation space on the S-shaped conveying path of the underground conveyor belt 100 for installing raw coal dewatering equipment.

[0059] In this embodiment, the unloading drum end of the first raw coal conveyor 200 is the unloading end, and the feed end 401 of the first-stage roller depth dewatering screen 400 is connected to the unloading drum 202.

[0060] It should be understood by those skilled in the art that the first raw coal conveyor 200 and the second raw coal conveyor 300 in this embodiment may each use independent conveyor belts.

[0061] In order to install the primary roller deep dewatering screen 400 and the secondary vibrating dewatering screen 500, a coal mine underground raw coal dewatering system of this embodiment includes a mounting bracket (not shown). The mounting bracket has a first mounting platform and a second mounting platform with different heights. The primary roller deep dewatering screen 400 is fixedly installed on the first mounting platform, and the secondary vibrating dewatering screen 500 is fixedly installed on the second mounting platform.

[0062] In this embodiment, a coal mine underground raw coal dewatering system is provided, wherein the screen opening of the primary roller depth dewatering screen 400 is ≤3mm; and the screen opening of the secondary vibrating dewatering screen 500 is 0.2-0.15mm.

[0063] This embodiment describes a coal mine underground raw coal dewatering system. A first raw coal conveyor 200 transports underground raw coal into a primary roller-driven deep dewatering screen 400. The oversize material enters a redirected second raw coal conveyor 300. Raw coal smaller than 3mm and undersize water are collected via an undersize chute and then enter a secondary vibrating dewatering screen 500. The oversize material from the secondary vibrating dewatering screen 500 also enters the redirected second raw coal conveyor 300. The undersize mud and water smaller than 0.2-0.15mm from the secondary vibrating dewatering screen 500 are collected via an undersize chute and flow to a coal slurry pit 600 on the side of the roadway.

[0064] As an optional implementation of this embodiment, a coal mine underground raw coal dewatering system of this embodiment includes a primary roller deep dewatering screen 400 comprising a screen body, with multiple screen shafts 404 arranged in parallel within the screen body. Each screen shaft 404 is independently driven to rotate by its own drive motor. Multiple wear-resistant screen plates 405 are fixedly arranged on each screen shaft 404. The wear-resistant screen plates 405 on adjacent screen shafts 404 are staggered, and a screen gap is formed between adjacent wear-resistant screen plates 405.

[0065] As an optional implementation of this embodiment, a coal mine underground raw coal dewatering system of this embodiment includes a secondary vibrating dewatering screen 500 comprising a base 504 and a screen frame 505 disposed on the base 504, a screen plate disposed at the bottom of the screen frame 505, and a vibrator for driving the screen frame 505 to vibrate and dewater on the base 504, wherein the screen plate forms a screen gap in the secondary vibrating dewatering screen 500 between the screen plates.

[0066] This embodiment of a coal mine underground raw coal dewatering system includes a three-stage resonant dewatering screen 800, a submersible slurry pump 700 installed in the coal slurry pool 600, the submersible slurry pump 700 being connected to the feed end 801 of the three-stage resonant dewatering screen 800, the oversize discharge end 802 of the three-stage resonant dewatering screen 800 being correspondingly located above the second raw coal conveyor 300, and the undersize discharge end 803 of the three-stage resonant dewatering screen 800 being connected to a drainage ditch.

[0067] The coal mine raw coal dewatering system provided in this embodiment, by introducing a three-stage resonant dewatering screen 800 and performing closed-loop treatment of coal slurry water, further brings the following core advantages and technical effects:

[0068] The system achieves closed-loop treatment and clean water recycling of coal slurry water, resulting in significant environmental benefits. Through a complete process chain of "coal slurry pool collection → submersible slurry pump transportation → three-stage resonant dewatering screen recovery," the system thoroughly solves the problem of treating fine coal slurry water. The undersize material from the three-stage resonant dewatering screen is deeply clarified clean water, which can be directly discharged into drainage ditches for underground dust suppression spraying or used as other production water, achieving water resource recycling. This not only greatly reduces the mine's fresh water consumption but also fundamentally eliminates the pollution of underground roadways and the working environment caused by the direct discharge of coal slurry water, resulting in extremely outstanding environmental benefits.

[0069] This system achieves highly efficient recovery of fine coal slime, maximizing coal resource utilization. The three-stage resonant dewatering screen is specifically designed to process high-concentration coal slime pumped from the coal slime pit by a submersible slurry pump. Utilizing the resonant principle, it exhibits excellent dewatering and recovery effects on extremely fine coal slime particles, effectively recovering previously almost inevitable fine-particle coal slime as oversize material, which is then uniformly transferred to the second raw coal conveyor, becoming part of the final product. This significantly elevates the coal resource recovery rate, achieving "every grain returned to the silo," and creating direct economic value.

[0070] The system boasts high integration, automated operation, and strong reliability: the submersible slurry pump operates immersed in the coal slime pit, directly extracting the settled coal slime and avoiding the suction and clogging problems of ordinary pumps, ensuring the continuity and stability of material supply to the three-stage screen. The addition of the three-stage resonant dewatering screen creates a comprehensive dewatering and recovery system covering all particle sizes from lump coal to coal slime. The entire system is highly automated; simply controlling the start and stop of each piece of equipment enables continuous automated operation from raw coal input to clean water discharge and dry coal output, reducing manual intervention and improving reliability.

[0071] This significantly reduces the load and operating costs of subsequent mine water treatment systems: Since most solid particles (including fine particles) are recovered within the dewatering system, the water discharged into the drainage ditch is clear, circulating water. This greatly slows down the siltation rate in the central mine water tank, significantly reduces the concentration of suspended solids in the influent to the mine water treatment plant, thereby drastically reducing the siltation work in the water tank and the treatment pressure and chemical consumption at the wastewater treatment plant, resulting in considerable savings in subsequent operating costs.

[0072] In summary, the addition of the three-stage resonant dewatering screen unit forms an organic whole with the already compact and efficient first- and second-stage dewatering systems. It is not only a necessary supplement to the first two stages of dewatering, but also elevates the entire system from a simple "dewatering" system to a complete resource utilization system integrating "dewatering, recycling, and water circulation," achieving a qualitative leap in environmental protection, economic benefits, and system automation.

[0073] Specifically, the three-stage resonant dewatering screen 800 described in this embodiment includes a screen box, at least one layer of screen mesh disposed at the bottom of the screen box, and a cylindrical explosion-proof motor for driving the screen box to resonate and dewater.

[0074] The sieve mesh size described in this embodiment is 0.075mm to 0.15mm.

[0075] In this embodiment, the slurry is transferred by a submersible pump 700 to a three-stage resonant dewatering screen 800 (replacing a filter press). The screen mesh size of the three-stage resonant dewatering screen 800 is 0.075mm. The fine dry coal slime on the three-stage resonant dewatering screen 800 also enters the redirected second raw coal conveyor 300. The water underflow from the three-stage resonant dewatering screen 800 flows by gravity to the side ditch of the conveyor belt (there is no coal slime to settle in the water).

[0076] Example 2

[0077] See Figures 2 to 5 As shown, the wear-resistant screen plate of a roller dewatering screen in this embodiment is suitable for the first-stage roller depth dewatering screen 400 in Embodiment 1, and includes:

[0078] Screen body 1;

[0079] Wear-resistant body 2 is fixed on the outer peripheral wall of the screen body 1. The wear-resistant body 2 is made of a material different from that of the screen body 1. The wear resistance of the wear-resistant body 2 is greater than that of the screen body 1. The impact toughness of the wear-resistant body 2 is better than that of the screen body 1.

[0080] The wear-resistant screen plate of the roller dewatering screen in this embodiment achieves performance optimization through a differentiated material composite structure (screen plate body 1 + wear-resistant body 2), and has the following technical effects:

[0081] 1. In this embodiment, the wear-resistant screen plate of a roller dewatering screen has the wear-resistant body 2 fixed to the outer peripheral wall of the screen plate body 1:

[0082] Local reinforcement of the sieve body 1: wear-resistant body 2 is added only to the easily worn parts (outer peripheral wall) to avoid replacing the entire material with high-cost materials and reduce manufacturing costs;

[0083] Substrate protection of screen body 1: Wear-resistant body 2 acts as a "sacrificial layer" to withstand the erosion of coal flow and extend the service life of screen body 1.

[0084] 2. In this embodiment, the wear-resistant screen plate of a roller dewatering screen is made of a different material than the screen plate body 1:

[0085] Complementary material properties: The main body 1 of the screen plate can be made of low-cost, easy-to-process materials to maintain the overall structural strength and process compatibility; the wear-resistant body 2 is made of high wear-resistant and high-toughness materials to specifically improve the performance of key parts.

[0086] To avoid material waste: Only wear-resistant body 2 uses high-priced materials, making it more economical.

[0087] 3. In this embodiment, the wear-resistant screen plate of a roller dewatering screen has a wear-resistant body 2 with a wear-resistant strength greater than that of the screen plate body 1.

[0088] Significantly improved wear resistance: The high hardness of wear-resistant body 2 can resist the friction and wear of coal particles and gangue, making it suitable for the harsh working conditions of small-pitch screens.

[0089] Extended service life: Compared with traditional single-material screens, wear-resistant body 2 can increase the overall service life by 3 to 5 times.

[0090] 4. In this embodiment, the wear-resistant screen plate of a roller dewatering screen has a wear-resistant body 2 with better impact toughness than the screen plate body 1:

[0091] Impact protection: Raw coal in underground coal mines often contains large pieces of gangue, and the high toughness of the wear-resistant material can prevent brittle spalling or fracture.

[0092] Reduce maintenance frequency: Avoid wear-resistant parts from falling off due to impact, and reduce downtime for maintenance.

[0093] like Figures 2 to 4 As shown in this embodiment, a wear-resistant screen plate of a roller dewatering screen has multiple inlay grooves evenly opened on the outer peripheral wall of the screen plate body 1 along the circumferential direction. The wear-resistant body 2 is an inlay block that matches the inlay grooves. Multiple inlay blocks are correspondingly inlaid in the multiple inlay grooves on the outer peripheral wall of the screen plate body 1 and are welded and fixed.

[0094] In this embodiment, multiple inlaid grooves are evenly opened on the outer peripheral wall of the screen plate body 1 in the circumferential direction to provide an installation reference for the wear-resistant body 2, ensure the positional accuracy of the wear-resistant block 2 (±0.5mm), and avoid the failure of the screen plate dynamic balance due to misalignment; the inlaid groove structure disperses the welding stress and reduces the deformation of the base (radial runout ≤0.2mm / m).

[0095] In this embodiment, the wear-resistant body 2 is an insert block that matches the insert groove. The close fit between the insert block and the insert groove (gap ≤ 0.1 mm) forms a physical locking position, reducing the risk of welding detachment. The segmented design of the insert block reduces the heat input of a single welding (≤ 1.5 kJ / mm), avoiding the degradation of the matrix material properties of the screen body 1.

[0096] In this embodiment, the single wear-resistant body 2 can be replaced independently when damaged, reducing maintenance costs by 70%.

[0097] As an optional implementation of this embodiment, in the wear-resistant screen plate of the roller dewatering screen of this embodiment, the inlaid groove is provided through the axial direction of the screen plate body 1, and the bottom width of the inlaid groove is greater than the opening width of the inlaid groove, forming an open groove structure that is wider inside and narrower outside.

[0098] This embodiment achieves synergistic optimization of multiple technical effects on the wear-resistant screen plate of the roller dewatering screen through an innovative "inner wide and outer narrow through-type embedded groove" design, specifically manifested in the following aspects:

[0099] Enhanced mechanical interlock effect

[0100] The inverted trapezoidal structure (wider inside and narrower outside) of the embedded groove forms a natural mechanical interlock, enabling the wear-resistant block 2 to generate a self-locking effect when subjected to circumferential coal flow impact. When the wear-resistant block 2 is subjected to external force, the groove wall will exert a three-dimensional constraint on the wear-resistant block 2, significantly improving its resistance to detachment. Experimental data shows that this structure improves the shear strength by about 40% compared to rectangular grooves, and under high-impact conditions in underground coal mines, the detachment rate of the wear-resistant block 2 can be reduced to 1 / 5 of that of the traditional structure.

[0101] Dual protection for optimized stress distribution

[0102] The through-type design ensures that stress is evenly distributed along the axial direction, avoiding localized stress concentration. The widened bottom structure increases the welding contact area, reducing the peak stress in the weld heat-affected zone (HAZ) by approximately 35%. Simultaneously, this structure transfers the main wear load to the screen substrate through the wide bottom surface, protecting the relatively weak groove opening and improving overall fatigue life by 2-3 times.

[0103] High-efficiency welding process adaptability

[0104] The unique opening structure provides a convenient passage for welding operations, enabling simultaneous welding on both sides. The widened bottom design provides ample space for molten pool formation, increasing weld penetration depth by approximately 25% and achieving a weld bond strength exceeding 350 MPa. This structure is particularly suitable for the high-volume, fast-paced maintenance needs common in coal mining equipment, improving welding efficiency by 30%.

[0105] Stability assurance under dynamic operating conditions

[0106] The continuous grooves running through the axial direction form a stable force flow transmission path, effectively suppressing vibration when the screen rotates at high speed (typically 200-400 rpm). Actual measurements show that this structure can control the amplitude at the critical speed to within 0.15 mm, a 60% reduction compared to traditional structures, significantly improving the stability of equipment operation in the confined spaces of underground coal mines.

[0107] Economic maintenance advantage

[0108] The modular design allows for quick replacement of individual wear blocks when they are damaged, reducing maintenance time by 70%. The standard size design of the grooves (e.g., the bottom width of the groove is uniformly 1.2-1.5 times that of the opening) enables universal interchangeability of wear blocks, reducing the types of spare parts in stock by 50% and significantly reducing maintenance costs.

[0109] Gradual utilization of material properties

[0110] By precisely controlling the groove bottom / groove width ratio (preferably 1.2:1 to 1.5:1), an ideal performance transition zone is formed between the hard wear-resistant block and the tough matrix. This design fully utilizes the high hardness characteristics of the wear-resistant material (surface hardness can reach HRC60 or higher) while using the toughness of the matrix to resist impact loads, thus achieving an optimized configuration of material properties.

[0111] This embodiment employs a method of embedding and welding of insert blocks and embedding grooves. The design of the dimensions, quantity, material selection, and welding process of the wear-resistant body 2 is crucial to ensuring both the overall wear resistance of the enhanced screen body 1 and the reliable welding and fixing of the wear-resistant body 2. Therefore, the specific implementation scheme of this embodiment is as follows:

[0112] 1. Determine the basic shape of wear-resistant block 2

[0113] The shape of the wear-resistant block 2 directly affects its wear resistance, weldability, and fit with the screen plate. Common shapes include:

[0114] Rectangular blocks: easy to process and weld, suitable for low-impact applications.

[0115] Trapezoidal blocks: reduce stress concentration and are suitable for high-impact conditions.

[0116] Curved blocks: fit better against the outer wall of the sieve plate, reducing the impact on the curvature.

[0117] In this embodiment, the wear-resistant block 2 is preferably a trapezoidal block or an arc-shaped block.

[0118] 2. Calculate the basic dimensional parameters of wear-resistant block 2.

[0119] In this embodiment, the circumference of the outer peripheral wall of the sieve plate body 1 is S, and the Brinell hardness of the wear-resistant body is H. B Impact toughness is K IC The dimensional parameters of the wear-resistant body 2 are designed as follows:

[0120] The width w of the wear-resistant body along the circumferential direction of the screen plate body 1 is determined based on the fact that the width of the wear-resistant block 2 affects the curvature of the screen plate, and it is necessary to ensure that its flat outer wall will not significantly damage the circular structure of the screen plate. The calculation formula is as follows:

[0121]

[0122] Where S is the circumference of the outer wall of the sieve body 1, S = 2πR, R is the radius of the sieve body 1, and h max The maximum allowable radial deviation is preset, typically 0.1–0.5 mm (depending on the sieve precision requirements);

[0123] The height h of the wear-resistant body 2 along the radial direction of the screen plate body 1 is determined based on the following: the wear-resistant block 2 needs to be thick enough to withstand wear, but too high a height will increase weight and stress. The calculation formula is as follows:

[0124]

[0125] Where W is the expected wear rate (mm / year), k is the preset safety factor (usually 2-5), and H B The Brinell hardness of wear-resistant material 2;

[0126] The thickness t of the wear-resistant body 2 along the axial direction of the screen plate body 1 is determined based on the following: the wear-resistant block 2 needs to be thick enough to resist impact, but excessive thickness will increase costs. The calculation formula is as follows:

[0127]

[0128] Among them, F impact To estimate the force of a single impact, K IC This refers to the impact toughness of the wear-resistant material.

[0129] 3. Determine the quantity n of wear-resistant blocks 2.

[0130] The wear-resistant block 2 partially covers (e.g., 50%–80%), and the number of wear-resistant bodies 3 arranged on the outer peripheral wall of the sieve body 2 is n. The formula for calculating the number n is:

[0131]

[0132] Wherein, α is the preset coverage ratio of the wear-resistant material on the outer peripheral wall of the sieve body (taken as 0.5 to 0.8), and n takes an even number so as to achieve a symmetrical distribution (such as 24, 36, 48).

[0133] 4. Influence of material parameters

[0134] The material selection for the wear-resistant body 2 in this embodiment satisfies: Brinell hardness H B ≥H B 700MPa, while also having impact toughness K IC ≥100J.

[0135] Example Design

[0136] Screen radius: R = 500 mm → S = 3141.6 mm;

[0137] Material: High-chromium cast iron (HB=650);

[0138] Operating conditions: moderate impact, annual wear 3mm.

[0139] design:

[0140] Shape: Trapezoidal block (impact resistant).

[0141] Width w (take h) max =0.2mm)::

[0142]

[0143] Height h:

[0144]

[0145] Thickness t (assuming impact force 6000N):

[0146]

[0147] Quantity n (covering 60%):

[0148]

[0149] Verification: Actual coverage is approximately 57% (64×28 / 3141.6).

[0150] In summary, the wear-resistant block 2 in this embodiment has the following technical features:

[0151] 1. Shape of wear-resistant blocks: determined by the toughness of the material (brittle → rectangular / trapezoidal, tough → arc-shaped).

[0152] 2. Dimension Calculation:

[0153] w is determined by the allowable arc deviation h max Decide.

[0154] h is determined by hardness and wear amount.

[0155] t is determined by impact toughness.

[0156] 3. Quantity n: Determined by the coverage ratio α and w, preferably an even number or a multiple of 4.

[0157] 4. Dynamic operating conditions: Dynamic balance must be considered to avoid vibration.

[0158] See Figure 5 As shown, as another way of fixing the wear-resistant block 2 and the screen body 1 in this embodiment, the wear-resistant body 2 is welded to the entire outer peripheral wall of the screen body 1.

[0159] Specifically, the wear-resistant body 2 is coated and welded onto the entire outer peripheral wall of the screen body 1 by laser cladding.

[0160] This embodiment employs laser cladding technology to integrally weld the wear-resistant material to the outer peripheral wall of the sieve body, which has the following significant technical advantages:

[0161] 1. Circumferential uniform protection system

[0162] Achieve 360° protection without blind spots, completely eliminating the wear weakness of joints in traditional segmented wear-resistant blocks; overall coverage improves wear uniformity by more than 80%, avoiding premature local failure;

[0163] It is particularly suitable for circumferential scouring conditions of high-concentration coal slurry in underground coal mines.

[0164] 2. Metallurgical bonding strengthens the interface

[0165] Laser cladding forms a metallurgical bonding layer of 0.5-1.2 mm with a bonding strength of over 400 MPa;

[0166] Microhardness gradient transition (matrix 200HV → bonding layer 350HV → surface layer 600HV);

[0167] It reduces the heat-affected zone by 50% compared to traditional welding methods, thus avoiding degradation of the base material properties;

[0168] 3. Ultra-thin high-strength wear-resistant layer

[0169] The thickness of the cladding layer can be precisely controlled within 1-3mm (traditional welding requires more than 5mm);

[0170] Material utilization rate increased by 60%, and consumption of precious metals decreased by 40%;

[0171] Surface roughness Ra≤3.2μm, reducing coal slime adhesion rate by 35%.

[0172] 4. Dynamic operational stability

[0173] The overall encapsulation ensures uniform mass distribution and achieves a dynamic balance level of G6.3;

[0174] Vibration value <0.1mm at 600rpm;

[0175] This completely avoids the airflow whistling problem that occurs when the segmented structure rotates at high speed.

[0176] 5. Adaptability to special working conditions

[0177] The continuous, dense surface layer can resist corrosion from mine water with a pH of 3-11;

[0178] No risk of brittle fracture under low temperature conditions of -30℃;

[0179] The impact resistance of coal gangue reaches 50J / cm. 2 .

[0180] 6. Advantages of intelligent manufacturing

[0181] The laser cladding process can be digitally controlled (accuracy ±0.1mm);

[0182] It facilitates the integration of online thickness monitoring sensors;

[0183] Supports remaining life prediction based on big data analytics.

[0184] 7. Optimize the entire life cycle cost

[0185] Although the initial cost is 20% higher than that of ordinary welding;

[0186] However, its service life is extended by 3-5 times;

[0187] The maintenance interval has been extended from 2 months to 1 year;

[0188] Overall usage costs are reduced by more than 40%.

[0189] Compared with traditional solutions, the core technological advantage of this embodiment lies in the synergistic innovation of materials, structure and process, which perfectly solves the multiple challenges of "wear resistance, impact resistance and corrosion resistance" faced by narrow-pitch screens while ensuring wear resistance.

[0190] As an optional implementation of this embodiment, the material of the sieve body 1 is a high-chromium alloy, and the material of the wear-resistant body 2 is a high-entropy alloy.

[0191] See Figure 2 , Figure 3 and Figure 5 As shown, in this embodiment, the center of the screen plate body 1 is provided with an installation hole 3, and multiple limiting protrusions 4 are provided in the installation hole 3. The limiting protrusions 4 can realize the limiting assembly between the screen plate body 1 and the roller of the roller dewatering screen, and can also be fixed by using a special clamp to limit and fix the wear-resistant body 2.

[0192] This embodiment also provides a primary roller depth dewatering screen 400 for material dewatering, including a roller and the wear-resistant screen plates, with multiple wear-resistant screen plates evenly spaced along the axial direction of the roller.

[0193] This embodiment of a primary roller depth dewatering screen 400 can be used for coal block dewatering in underground mines. Moreover, due to the use of wear-resistant screen plates, it has better wear resistance, meets the needs of various working conditions, and the whole machine operates more stably and reliably.

[0194] The above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, the present utility model is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present utility model, and all technical solutions and improvements that do not depart from the spirit and scope of the utility model, are covered within the scope of the claims of the present utility model.

Claims

1. A coal mine underground raw coal dewatering system, characterized in that, include: First raw coal conveyor; The second raw coal conveyor is located below the unloading end of the first raw coal conveyor, and an installation space is formed between the first raw coal conveyor and the second raw coal conveyor. A primary roller deep dewatering screen is installed in the installation space. The feed end of the primary roller deep dewatering screen is connected to the discharge end of the first raw coal conveyor, and the oversize discharge end of the primary roller deep dewatering screen is correspondingly located above the second raw coal conveyor. A secondary vibrating dewatering screen is installed in the installation space and located below the primary roller depth dewatering screen. The feed end of the secondary vibrating dewatering screen is connected to the undersize discharge end of the primary roller depth dewatering screen, and the oversize discharge end of the secondary vibrating dewatering screen is correspondingly located above the second raw coal conveyor. The coal slime pit is connected to the discharge end of the undersize material from the secondary vibrating dewatering screen.

2. The coal mine underground raw coal dewatering system according to claim 1, characterized in that, The first raw coal conveyor includes a first conveying roller group and an unloading drum, and the second raw coal conveyor includes a second conveying roller group and a redirecting drum; The coal mine underground raw coal dewatering system includes a conveyor belt, which is laid horizontally on the first conveyor roller group, extends to the unloading roller and is redirected to the redirecting roller, and then redirected again by the redirecting roller and laid horizontally on the second conveyor roller group, so that the conveyor belt forms an S-shaped conveying path; An installation space is formed between the horizontal conveyor belt segment laid on the first conveyor roller group and the horizontal conveyor belt segment laid on the second conveyor roller group.

3. The coal mine underground raw coal dewatering system according to claim 2, characterized in that, The unloading drum end of the first raw coal conveyor is the unloading end, and the feed end of the first-stage roller depth dewatering screen is connected to the unloading drum.

4. The coal mine underground raw coal dewatering system according to claim 1, characterized in that, The system includes a mounting bracket with a first mounting platform and a second mounting platform at different heights. The primary roller deep dewatering screen is fixedly mounted on the first mounting platform, and the secondary vibrating dewatering screen is fixedly mounted on the second mounting platform.

5. A coal mine underground raw coal dewatering system according to claim 1, characterized in that, The screen gap of the primary roller depth dewatering screen is ≤3mm; the screen gap of the secondary vibrating dewatering screen is 0.2-0.15mm.

6. A coal mine underground raw coal dewatering system according to claim 5, characterized in that, The primary roller deep dewatering screen includes a screen body with multiple screen shafts arranged in parallel inside the screen body. Each screen shaft is independently driven to rotate by its own drive motor. Multiple wear-resistant screen plates are fixedly arranged on each screen shaft. The wear-resistant screen plates on adjacent screen shafts are staggered, and the screen gaps between adjacent wear-resistant screen plates form the screen gap of the primary roller deep dewatering screen.

7. A coal mine underground raw coal dewatering system according to claim 5, characterized in that, The secondary vibrating dewatering screen includes a screen frame, a screen plate disposed at the bottom of the screen frame, and a vibrator for driving the screen frame to vibrate and dewater. The screen plate forms a screen gap between the screen plates.

8. A coal mine underground raw coal dewatering system according to any one of claims 1-7, characterized in that, The system includes a three-stage resonant dewatering screen. A submersible slurry pump is installed in the coal slurry pool. The submersible slurry pump is connected to the feed end of the three-stage resonant dewatering screen. The discharge end of the oversize material of the three-stage resonant dewatering screen is located above the second raw coal conveyor. The discharge end of the undersize material of the three-stage resonant dewatering screen is connected to a drainage ditch.

9. A coal mine underground raw coal dewatering system according to claim 8, characterized in that, The three-stage resonant dewatering screen includes a screen box, at least one layer of screen mesh disposed at the bottom of the screen box, and a cylindrical explosion-proof motor for driving the screen box to resonate and dewater.

10. A coal mine underground raw coal dewatering system according to claim 9, characterized in that, The screen mesh size is 0.075mm to 0.15mm.

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