Planar dehydration and medium drainage screen for dense medium coal washing

Abstract

The utility model relates to a plane dehydration and medium drainage screen for heavy-medium coal washing, and aims to solve the problems of no material hanging on a screen plate, serious water and medium leakage, easiness in abrasion of the screen plate, frequent replacement and the like in the dehydration and medium drainage process of fine middling coal in a coal preparation plant of the conventional sieve bend. The planar coal unloading screen comprises a coal unloading screen frame and a coal unloading screen support, and the angle between the coal unloading screen frame and the coal unloading screen support can be adjusted in a hinged mode. A plane screen mechanism is arranged in the coal unloading screen frame and is formed by arranging a plurality of small screen plates in a matrix mode, and screen seams are parallel to the material moving direction. By means of the design, the dehydration and medium drainage efficiency is remarkably improved, sieve plate abrasion and maintenance cost are reduced, meanwhile, the sieve plate replacement process is simplified, and the labor intensity of workers is relieved. Experiments prove that the dehydration and medium drainage effect of the plane coal unloading screen is improved by nearly 60% compared with that of a traditional arc-shaped screen, and the plane coal unloading screen has the advantages of being high in screening precision, good in stability, remarkable in economic benefit and the like and is suitable for coal preparation plants and other occasions needing efficient material screening.

Description

Technical Field

[0001] The utility model relates to the technical field of screening equipment, in particular to a planar dehydration and desliming screen for heavy medium coal washing. Background Art

[0002] In the process of cleaning medium coal in a coal preparation plant, dehydration and desliming is a crucial link. Traditionally, an arc screen is mostly used as the main screening equipment in this link. With its unique arc design, the arc screen can improve the screening efficiency and processing capacity of materials to a certain extent. However, with the expansion of production scale and the improvement of process requirements, many drawbacks of the arc screen have gradually emerged.

[0003] Firstly, during the use of the arc screen, due to the certain curvature and large area of the screen plate, the screen surface is prone to wear, and then the phenomenon of the screen plate not hanging materials occurs. This phenomenon directly leads to the aggravation of the problems of water and medium running away, that is, a large amount of water and medium cannot be effectively separated and enter the subsequent processing links together with the materials, seriously affecting the dehydration and desliming effect.

[0004] Secondly, the screen slot design of the arc screen is usually perpendicular to the movement direction of the materials. This design is prone to cause the accumulation and blockage of materials during the screening process, further reducing the screening efficiency. In addition, due to the uneven wear of the screen surface, the size of the screen slot will also change, thus affecting the screening accuracy and stability.

[0005] Moreover, the replacement process of the screen plate of the arc screen is cumbersome and costly. Due to the large area and complex structure of the screen plate, once a failure occurs or the wear is serious, the whole screen plate often needs to be replaced, which not only increases the maintenance workload but also raises the production cost. At the same time, the frequent replacement of the screen plate also increases the labor intensity and safety risks of workers.

[0006] In view of the above problems, there is an urgent need in the industry for a new type of screening equipment that can replace the traditional arc screen, has higher dehydration and desliming efficiency, lower maintenance cost and better stability. Summary of the Utility Model

[0007] In order to solve the problems of the prior art, the utility model provides a planar dehydration and desliming screen for heavy medium coal washing, which adopts the design of a planar screen mesh mechanism. The screen plates are arranged equidistantly in a matrix, and the screen slots are parallel to the movement direction of the materials. This design not only increases the screening area and improves the screening efficiency, but also effectively solves the problems of easy wear of the screen surface and easy blockage of the screen slots.

[0008] In order to solve the above technical problems, the utility model is realized through the following technical solutions: the planar dehydration and desliming screen for heavy medium coal washing includes a coal unloading screen frame and a coal unloading screen support. The coal unloading screen frame and the coal unloading screen support can be hinged to each other for adjusting the rotation angle of the coal unloading screen frame;

[0009] The inner part of the coal unloading screen frame is fixedly connected with a flat screen mechanism. The flat screen mechanism adopts a flat structure and is composed of a screen frame, fixed side plates, a screen mounting frame and a screen plate. The fixed side plates are respectively arranged on both sides of the screen frame and are used for fixedly connecting with the inner wall of the coal unloading screen frame. The screen mounting frame is arranged inside the screen frame and is used for fixedly connecting with the screen plate. The number of screen plates is set to be multiple, and they are arranged equidistantly in a matrix at the top of the screen frame and the screen mounting frame.

[0010] In this embodiment, by technically reforming the arc screen frame, the original arc screen is technically reformed into a flat screen mechanism. Before the technical reform, the screen plate of the arc screen had a certain curvature, and the screen plate was relatively large. The angle of the screen slit was also perpendicular to the movement direction of the material. During use, the screen surface was easily worn. As a result, the screen surface of the arc screen was not easy to hang materials, and most of the materials flowing down in a swirl reached the dewatering and desliming screen. In order to solve this problem well, we technically reformed the arc screen. We changed its curved screen plate into a flat screen mechanism and at the same time changed the large screen plate into small screen plates, and changed the screen slit of the screen plate to be parallel to the movement direction of the material. After the above technical reform, the dewatering and desliming effect of the screen has increased by nearly 60% compared with the arc screen. This not only ensures the treatment effect of the dewatering and desliming screen, but also ensures the density and liquid level of the suspension in the raw coal combined medium tank. In addition, by technically reforming the size of the screen plate, the maintenance frequency of the screen has been further reduced, and the maintenance workload of the maintenance team has been reduced. It is also easier to replace the screen plate. Before, when the screen plate was damaged or did not hang materials, the whole piece had to be replaced. After the technical reform, we can just replace a small piece of the screen plate where it is damaged. This not only saves time in the production process, but also saves a lot in terms of production costs.

[0011] In some specific embodiments, a feed inlet is provided at the top of one side of the coal unloading screen frame and is used for connecting with an external feeding box.

[0012] In some specific embodiments, bottom side discharge ports are provided at the bottoms of both sides of the coal unloading screen frame and are used for discharging the materials that have passed through the flat screen mechanism.

[0013] In some specific embodiments, vibrators are fixedly connected to both sides of the bottom end of the coal unloading screen frame and are used for vibrating the coal unloading screen frame to accelerate the screening of the internal materials.

[0014] In some specific embodiments, a support seat is fixedly connected to the bottom end of the coal unloading screen frame, a mounting seat is fixedly connected to the top end of the coal unloading screen support, a hinge seat is fixedly connected to the top of one end of the mounting seat, a hydraulic push rod is hinged to the top of the other end of the mounting seat, the top output end of the hydraulic push rod is hinged to one end of the bottom of the support seat, and the hinge seat is hinged to the other end of the bottom of the support seat.

[0015] In some specific embodiments, the sieve slots of the sieve plate are arranged parallel to the movement direction of the material. In combination with the design of the overall planar structure of the planar sieve mesh mechanism, the efficiency of medium separation and dehydration is increased by nearly 55%-65% compared to the traditional arc sieve.

[0016] The beneficial effects of the present utility model are as follows:

[0017] 1. By transforming the arc sieve into a planar medium unloading sieve and optimizing the sieve plate structure and sieve slot direction, the present patent achieves a significant improvement in the efficiency of dehydration and medium separation. The design of the planar sieve mesh mechanism makes the distribution of the material on the sieve surface more uniform. The parallel arrangement of the sieve slots and the movement direction of the material reduces the accumulation and blockage of the material, thereby improving the screening efficiency. Experimental data shows that the dehydration and medium separation effect of the present planar coal unloading sieve is improved by nearly 60% compared to the traditional arc sieve, significantly enhancing the production efficiency of the coal preparation plant;

[0018] 2. The planar coal unloading sieve adopts a modular design, with a large number of sieve plates and easy replacement. When a local sieve plate is worn or damaged, only the corresponding small sieve plate needs to be replaced, without the need for overall replacement, greatly reducing the maintenance cost and replacement difficulty. At the same time, due to the simplification of the sieve plate replacement process, the labor intensity of workers is also reduced accordingly, improving work efficiency and safety;

[0019] 3. The design of the planar sieve mesh mechanism makes the sieve surface smoother, reducing the change in sieve slot size caused by uneven wear of the sieve surface, thereby improving the screening accuracy. In addition, the design of parallel sieve slots also reduces the residence time of the material on the sieve surface, avoiding the decline in screening effect caused by long-term accumulation. These factors work together to make the present planar coal unloading sieve perform excellently in terms of screening accuracy and stability;

[0020] 4. Due to the improvement of dehydration and medium separation efficiency and the reduction of maintenance cost, the application of the present planar coal unloading sieve can significantly optimize the production process of the coal preparation plant. The high screening capacity enables the stable control of the density and liquid level of the suspension in the raw coal combined medium barrel, which is beneficial to the smooth progress of subsequent treatment processes. At the same time, the reduction of production cost and the improvement of economic benefits also make the present patent have broad application prospects and market competitiveness in the coal preparation industry. Description of the Drawings

[0021] Figure 1 is the overall structural schematic diagram of the present utility model.

[0022] Figure 2 is the internal structural schematic diagram of the coal unloading sieve frame of the present utility model.

[0023] Figure 3 is the exploded schematic diagram of the planar sieve mesh mechanism of the present utility model.

[0024] Figures 1-3In Chinese: 1. Coal unloading screen frame; 2. Coal unloading screen support; 11. Support seat; 12. Vibrator; 13. Bottom side discharge port; 14. Planar screen mechanism; 141. Screen frame; 142. Fixed side plate; 143. Screen mounting frame; 144. Screen plate; 15. Feed inlet; 21. Mounting seat; 22. Hydraulic push rod; 23. Hinge seat. Detailed implementation mode

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] As Figures 1-3 shown in the planar dehydration and desliming screen for heavy medium coal washing, it includes a coal unloading screen frame 1 and a coal unloading screen support 2. The coal unloading screen frame 1 and the coal unloading screen support 2 can be hinged to each other for adjusting the rotation angle of the coal unloading screen frame 1.

[0027] A planar screen mechanism 14 is fixedly connected inside the coal unloading screen frame 1. The planar screen mechanism 14 adopts a planar structure and is composed of a screen frame 141, fixed side plates 142, a screen mounting frame 143 and a screen plate 144. The fixed side plates 142 are respectively arranged on both sides of the screen frame 141 for fixedly connecting with the inner wall of the coal unloading screen frame 1. The screen mounting frame 143 is arranged inside the screen frame 141 for fixedly connecting with the screen plate 144. The number of screen plates 144 is set to be multiple and is arranged equidistantly in a matrix at the top of the screen frame 141 and the screen mounting frame 143. This planar coal unloading screen is mainly composed of components such as a coal unloading screen frame 1, a coal unloading screen support 2, and a planar screen mechanism 14. Its core lies in the design of the planar screen mechanism 14 and its optimized cooperation with the overall structure, realizing efficient and stable dehydration and desliming functions.

[0028] On one side of the top of the coal unloading screen frame 1, there is a feed inlet 15 for connecting with an external feeding box. At the bottom of both sides of the coal unloading screen frame 1, there are bottom side discharge outlets 13 for discharging the materials passing through the flat screen mechanism 14. On both sides of the bottom end of the coal unloading screen frame 1, vibrators 12 are fixedly connected for vibrating the coal unloading screen frame 1 to accelerate the screening of the internal materials. At the bottom end of the coal unloading screen frame 1, a support base 11 is fixedly connected. At the top end of the coal unloading screen support 2, a mounting seat 21 is fixedly connected. At the top of one end of the mounting seat 21, a hinge seat 23 is fixedly connected. At the top of the other end of the mounting seat 21, a hydraulic push rod 22 is hinged. The top output end of the hydraulic push rod 22 is hinged with one end of the bottom of the support base 11, and the hinge seat 23 is hinged with the other end of the bottom of the support base 11. The screen slits of the screen plate 144 are set to be parallel to the movement direction of the materials. With the design of the overall flat structure of the flat screen mechanism 14, the medium separation and dehydration efficiency is increased by nearly 55%-60% compared with the traditional arc screen.

[0029] Working principle:

[0030] Feeding and preliminary screening:

[0031] The materials enter the feed inlet at the top of the coal unloading screen frame through an external feeding box and enter the flat screen mechanism 14. The flat screen mechanism 14 consists of a screen frame 141, fixed side plates 142, a screen mounting frame 143 and multiple screen plates 144 arranged in a matrix. This design effectively increases the screening area and makes the material distribution more uniform.

[0032] Vibrating screening:

[0033] The vibrators at the bottom end are started to generate high-frequency vibrations, which are transmitted to the flat screen mechanism 14 through the screen frame, prompting the materials to be quickly screened on the screen. Vibration not only accelerates the movement of the materials but also improves the screening efficiency, making it easier to separate the moisture and medium in the materials.

[0034] Parallel screen slit optimization:

[0035] The screen slits of the screen plate 144 are designed to be parallel to the movement direction of the materials. This innovative design significantly improves the medium separation and dehydration efficiency. The parallel screen slits can effectively reduce the accumulation and blockage of materials on the screen surface, enabling the materials to pass through the screen slits smoothly while ensuring the screening accuracy and efficiency.

[0036] Advantages of the flat structure:

[0037] The flat screen mechanism 14 adopts a flat structure design. Compared with the traditional arc screen, its screen surface is flatter, less prone to wear, and the screening effect is more stable. The flat structure also facilitates the installation, disassembly and replacement of the screen plate, reducing the maintenance cost and labor intensity.

[0038] Angle adjustment and discharging:

[0039] The coal unloading screen frame and the coal unloading screen support are connected by hinges and equipped with hydraulic push rods for angle adjustment. This design allows the inclination angle of the screen surface to be adjusted according to actual needs to optimize the screening effect and the discharging speed. The screened materials are discharged through the bottom side discharge port and enter the subsequent treatment process.

[0040] Through the above design, the dehydration and desliming efficiency of this planar coal unloading screen has increased by nearly 60% compared with the traditional arc screen, effectively solving the serious problem of water and medium leakage. At the same time, the replacement of the screen plate is more convenient, reducing the maintenance frequency and cost. Overall, this patent significantly improves the production efficiency of the coal preparation plant, reduces the production cost, and improves the production safety and stability.

[0041] In summary, through technological innovation and optimized design, this patent realizes the efficient, stable and low-cost dehydration and desliming function of the planar coal unloading screen, providing strong support for the technological progress and industrial upgrading of the coal preparation industry.

[0042] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flat dewatering and de-mediating screen for heavy medium coal washing, comprising a coal unloading screen frame (1) and a coal unloading screen support (2), characterized in that: The coal unloading screen frame (1) and the coal unloading screen bracket (2) can be hingedly connected to adjust the rotation angle of the coal unloading screen frame (1); A planar screen mechanism (14) is fixedly connected inside the coal unloading screen frame (1). The planar screen mechanism (14) adopts a planar structure. The planar screen mechanism (14) consists of a screen frame (141), a fixed side plate (142), a screen mounting frame (143) and a screen plate (144). The fixed side plates (142) are respectively arranged on both sides of the screen frame (141) for being fixedly connected to the inner wall of the coal unloading screen frame (1). The screen mounting frame (143) is arranged inside the screen frame (141) for being fixedly connected to the screen plate (144). The number of the screen plates (144) is set to be multiple and is equidistantly arranged in a matrix shape at the top of the screen frame (141) and the screen mounting frame (143).

2. The flat dewatering and demediating screen for heavy medium coal washing according to claim 1, characterized in that: A feed port (15) is provided on the top of one side of the coal unloading screen frame (1) for connecting to an external feed box.

3. The flat dewatering and demediating screen for heavy medium coal washing according to claim 1, characterized in that: The bottoms of both sides of the coal unloading screen frame (1) are provided with bottom side discharge ports (13) for discharging materials passing through the flat screen mechanism (14).

4. The flat dewatering and demediating screen for heavy medium coal washing according to claim 1, characterized in that: Vibrators (12) are fixedly connected to both sides of the bottom end of the coal unloading screen frame (1) for vibrating the coal unloading screen frame (1) to accelerate the screening of the internal materials.

5. The flat dewatering and demediating screen for heavy medium coal washing according to claim 1, characterized in that: The bottom end of the coal unloading screen frame (1) is fixedly connected to a support seat (11), the top end of the coal unloading screen bracket (2) is fixedly connected to a mounting seat (21), the top of one end of the mounting seat (21) is fixedly connected to a hinge seat (23), the top of the other end of the mounting seat (21) is hinged to a hydraulic push rod (22), the top output end of the hydraulic push rod (22) is hinged to one end of the bottom of the support seat (11), and the hinge seat (23) is hinged to the other end of the bottom of the support seat (11).

6. The flat dewatering and demediating screen for heavy medium coal washing according to claim 1, characterized in that: The sieve slots of the sieve plate (144) are arranged to be parallel to the moving direction of the material, and in combination with the overall planar structural design of the planar screen mechanism (14), the de-mediation and dehydration efficiency is increased by nearly 55%-65% compared with the conventional curved screen.

Images