A split drum screen for coal water slurry mill discharge section

Abstract

The utility model relates to water coal slurry production equipment technical field, specifically disclose a kind of for water coal slurry mill discharge part's piece type drum screen. The drum screen includes screen rack and at least two arc-shaped sieve plates;Screen rack is equipped with tubular framework and the multiple support rib plates distributed along the axial direction, and support rib plate is arranged along the framework circumference direction;Arc-shaped sieve plate is matched with the radian of screen rack, and it is detachably connected in support rib plate by connecting piece, and sieve slit is equipped on sieve plate. The present application solves the problems of difficult installation and disassembly, high maintenance cost and long replacement cycle of traditional integral drum screen, has the characteristics of convenient installation, low maintenance cost and strong adaptability, and can quickly replace the locally damaged sieve plate or adjust the size of sieve slit to adapt to different capacity requirements.

Description

Technical Field

[0001] This utility model belongs to the technical field of coal-water slurry production equipment, and in particular relates to a screening device for the discharge section of a coal-water slurry mill, specifically a segmented drum screen. Background Technology

[0002] In the coal-water slurry production process, the drum screen in the mill discharge section is a key piece of equipment to ensure the quality of coal slurry and production efficiency. Its function is to screen the ground coal slurry and separate out particles that do not meet the particle size requirements.

[0003] Currently, the industry commonly uses integrated drum screens, where the screen mesh and frame are welded together as a single unit. While this structure ensures uniform stress distribution and seamless assembly during operation, guaranteeing screening stability, it has significant drawbacks: Installation and disassembly are difficult: the integral drum screen is heavy and bulky, requiring cranes and other hoisting equipment for installation and disassembly. The bolts connecting it to the discharge bushing are also very tight, making disassembly labor-intensive. It is also prone to collisions with surrounding equipment during installation and disassembly, has strict requirements for installation space, and takes a long time.

[0004] High maintenance costs: When the screen is partially damaged, the entire drum screen needs to be replaced, resulting in high spare parts costs; and because the production cycle of integral screens is long, spare parts are usually not stocked, which prolongs the downtime for equipment maintenance and seriously affects production efficiency.

[0005] To solve the above problems, there is an urgent need for a drum screen structure that is easy to install, has low maintenance costs, and can be flexibly adjusted. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to provide a segmented drum screen that addresses the above-mentioned prior art, aiming to achieve quick assembly and disassembly, reduce maintenance costs, and flexibly adapt to production capacity requirements.

[0007] The technical solution adopted by this utility model to solve the above problems is: a segmented drum screen for the discharge part of a coal-water slurry mill, including a screen frame and at least two arc-shaped screen plates; The screen frame includes a cylindrical skeleton and multiple supporting ribs. The cylindrical skeleton is a cylindrical structure with open ends, and its axial length is adapted to the discharge port of the coal-water slurry mill. The supporting ribs are distributed at intervals along the axial direction of the cylindrical skeleton, and each supporting rib is continuously arranged along the circumference of the cylindrical skeleton. The cross-section of the supporting ribs is I-shaped to enhance the structural strength. The arc of the arc-shaped screen plate matches the outer circumferential arc of the cylindrical frame. Multiple arc-shaped screen plates are spliced ​​together along the circumference of the cylindrical frame to form a complete cylindrical screening surface. Screen slots are evenly distributed on the arc-shaped screen plate, and the width of the screen slots can be set to 0.5-5mm according to the production capacity requirements. The arc-shaped sieve plate and the supporting rib plate are detachably connected by connectors, which include hexagonal countersunk screws (compliant with GB / T2673), all-metal lock nuts (compliant with GB / T6184), flat washers (compliant with GB / T95) and spring washers (compliant with GB / T93). The support rib is provided with a positioning component, which includes a positioning pin on the support rib and a positioning hole on the arc-shaped screen plate. The positioning pin and the positioning hole are fitted with a clearance to quickly position the screen plate.

[0008] Compared with the prior art, the present invention has the following beneficial effects: 1. Easy installation and disassembly: The arc-shaped screen plate is lightweight (single piece weight ≤15kg), requiring no hoisting equipment and can be installed and disassembled manually; the positioning component can further shorten the installation time.

[0009] 2. Low maintenance cost: When a part is damaged, only a single screen plate needs to be replaced, instead of replacing the whole screen, reducing spare parts costs by more than 60%; the maintenance cycle is shortened to less than 30 minutes, reducing equipment downtime.

[0010] 3. High adaptability: The production capacity can be quickly adjusted by changing the screen plate with different screen gap widths (screen gap width of 0.5-5mm corresponds to a production capacity of 5-30t / h). Screen plates of the same specification drum screen can be used interchangeably, improving the equipment's versatility.

[0011] 4. Good screening stability: The structural strength is enhanced by I-shaped support ribs, and the sealing components reduce coal slurry leakage, ensuring screening quality. Attached Figure Description

[0012] Figure 1 is a schematic diagram of the structure of this utility model.

[0013] Figure 2 for Figure 1 AA sectional view.

[0014] Figure 3 This is a schematic diagram of the screen frame structure of this utility model.

[0015] Figure 4 This is a schematic diagram of the arc-shaped sieve plate structure of this utility model.

[0016] Figure 5 for Figure 4 AA sectional view.

[0017] Figure 6 for Figure 4 BB cross-sectional view.

[0018] Figure 7 for Figure 2 Enlarged schematic diagram of point I in the middle.

[0019] In the diagram: 1 - screen frame, 2 - arc-shaped screen plate, 3 - supporting rib plate. Detailed Implementation

[0020] The technical solution of this utility model will be described in more detail below with reference to preferred embodiments. However, these embodiments are merely descriptions of preferred implementations of this utility model and should not be construed as limiting the scope of this utility model in any way.

[0021] Example 1: Basic type segmented drum screen This embodiment provides a basic segmented drum screen, including a screen frame and three arc-shaped screen plates.

[0022] Screen frame: The cylindrical skeleton is made of Q235 steel with a diameter of 500mm and an axial length of 1200mm; 6 supporting ribs are set at 200mm intervals along the axial direction. The supporting ribs are I-shaped (80mm high and 10mm thick web) and are welded and fixed to the cylindrical skeleton.

[0023] Arc-shaped screen plate: Made of wear-resistant stainless steel (304 stainless steel), the central angle of a single screen plate is 120°, the thickness is 5mm, the screen gap width is 2mm, and the screen gap spacing is 10mm; each screen plate has 4 connection holes at both ends corresponding to the support ribs.

[0024] Connectors: The screen plate and the support rib plate are fixed by using internal hexagonal countersunk screws (M10×30), all-metal lock nuts (M10), flat washers (φ12) and spring washers (φ12) through the connecting holes.

[0025] Installation process: For the first installation, first fix the screen frame to the mill outlet using hoisting equipment; then manually splice the three arc-shaped screen plates along the circumference of the screen frame, align the connecting holes, and install the flat washer, spring washer, screw and nut in sequence, and tighten the nuts with a torque wrench (torque 30-35N・m); after installation, check whether the screen plate splicing is flat and without obvious gaps.

[0026] Maintenance and replacement: When a screen plate is partially damaged, there is no need to disassemble the screen frame. Simply loosen the nuts of the corresponding screen plate, remove the damaged screen plate, replace it with a new screen plate, and retighten the connecting parts. The whole process does not require hoisting equipment, can be operated by a single person, and takes no more than 30 minutes.

[0027] Example 2: Segmented Rotary Screen with Positioning Components This embodiment adds a positioning component to the existing embodiment 1, and the specific structure is as follows: Positioning components: Three positioning pins (8mm in diameter and 15mm in length) are set at 120° intervals on the circumferential surface of each support rib. The positioning pins are welded and fixed to the support rib. Correspondingly, three positioning holes (8.5mm in diameter and 16mm in depth) are provided on the inner side of each arc-shaped screen plate (the side in contact with the support rib). The positioning holes correspond one-to-one with the positioning pins.

[0028] Installation process: For the first installation, first fix the screen frame; then align the positioning holes of the arc-shaped screen plate with the positioning pins of the support rib plate and insert them to achieve quick circumferential positioning. At this time, the connecting holes will automatically align; the subsequent installation steps of the connecting parts are the same as in Example 1.

[0029] Advantages: The positioning components can reduce the alignment time during screen plate installation, improve installation efficiency, avoid repeated adjustments due to misalignment of connection holes, and shorten the installation time of a single screen plate by 40% compared to Example 1.

[0030] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this invention should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A segmented drum screen for the discharge section of a coal-water slurry mill, characterized in that, The screen includes a screen frame and at least two arc-shaped screen plates. The screen frame includes a cylindrical skeleton and multiple supporting ribs. The supporting ribs are spaced apart along the axial direction of the cylindrical skeleton and are continuously arranged along the circumference of the cylindrical skeleton. The arc of the arc-shaped screen plates matches the outer circumferential arc of the cylindrical skeleton. Multiple arc-shaped screen plates are spliced ​​together along the circumference of the cylindrical skeleton to form a complete cylindrical screening surface. The arc-shaped screen plates are provided with screen slots and are detachably connected to the supporting ribs through connectors.

2. The segmented drum screen according to claim 1, characterized in that, The connector includes a countersunk hexagonal screw, an all-metal lock nut, a flat washer, and a spring washer; the countersunk hexagonal screw conforms to GB / T2673, the all-metal lock nut conforms to GB / T6184, the flat washer conforms to GB / T95, and the spring washer conforms to GB / T93.

3. The segmented drum screen according to claim 1, characterized in that, The cross-section of the supporting stiffener is I-shaped, and 3-8 stiffeners are evenly distributed along the axial direction of the cylindrical skeleton.

4. The segmented drum screen according to claim 1, characterized in that, The number of arc-shaped sieve plates is 2-6, and the central angle of a single sieve plate is 60°-180°.

5. The segmented drum screen according to claim 1, characterized in that, It also includes a positioning component, which includes a positioning pin disposed on a support rib and a positioning hole opened on an arc-shaped screen plate, wherein the positioning pin and the positioning hole are clearance-fitted.

Images