CN204503536U - A kind of cantilever vibration sieve screening plant of coking coal - Google Patents

Abstract

The utility model relates to a cantilever vibrating screen screening device for coking coal, which comprises a main frame and a side coal retaining plate welded to the main frame and located on the side of the main frame. The front end of the main frame is provided with a gate-shaped steel beam. The root of the sieve bar is welded and fixed on the outer upper end of the door-shaped steel beam, and a buffer rubber pad is installed on the outside of the door-shaped steel beam. On the main frame below the end of the sieve bar, a 60Mn material of DN25mm is welded perpendicular to the direction of the sieve bar arrangement. Amplitude adjustment rod made of thick-skinned round tube. The service life of the sieve bar is extended to more than one quarter, and it can effectively avoid the risk of the sieve bar breaking and falling off to threaten the subsequent process and cause the production to stop. It is conducive to safe production, making the cantilever vibrating screen a better choice for coking coal screening.

Description

A cantilever vibrating screen screening device for coking coal

technical field

The utility model belongs to the technical field of coking coal pretreatment, and relates to a cantilever vibrating screen screening device for coking coal.

Background technique

The coking industry has been committed to the research and application of coking coal pretreatment technology to increase the proportion of low-priced weakly caking coal and reduce the cost of coal blending. The coking coal screening process has the characteristics of simple process and low investment. Therefore, coking The industry attaches great importance to the development and application of the screening and crushing process. The method is to screen out some fine particles through the screening equipment. The large particles on the screen enter the crushing equipment to be fully crushed, and the fine particles under the screen directly enter the belt behind the crushing equipment to achieve a more reasonable The crushing fineness and particle size distribution can achieve the purpose of improving coke quality, expanding coal resources, and reducing procurement costs. At present, due to the lack of successfully applied finalized products, there are few domestic coking plants using screening technology.

See Figures 2 to 4. Domestic attempts have been made to adopt a dual-row cantilever vibrating screen screening device mainly used for screening coke or sinter under the blast furnace tank for coking coal screening. The device uses a ∮6mm spring The steel bar is used as the sieve bar 10 with a gap of 3 mm. The sieve bar 10 is welded and fixed on the square steel at the root of the main frame 6. After heavy-duty commissioning and production, the screening device keeps breaking down and the efficiency is low, and the production gradually falls into a passive state. Mainly manifested in: while the screening efficiency is low, the sieve bar 10 completes a cycle of corrosion, wear, deformation, fracture, and shedding within 2 to 3 days. The main reason for the analysis is that the water content of coking coal is generally above 10%, and the sulfur content is about 0.7%, which corrodes spring steel quickly. In addition, the scouring effect of coking coal flow makes the ∮6mm spring steel sieve bar 10 more corroded, worn and deformed. Fast; although the coking coal fineness index is mainly to control the proportion of coking coal above 3mm, when the wet coal passes through the sieve bar 10 with a gap of 3mm, the fine coal powder adheres to the sieve bar 10, making the gap narrow or even compacted, resulting in The screening efficiency is greatly reduced; the sieve bar 10 is welded on both sides (four points) on the square steel at the root of the main frame 6, and the welding causes local stress damage to the sieve bar 10. The welding point becomes the maximum stress point of the shear force; after the sieve plate is partially hardened, the coking coal is difficult to sieve, and all pass through the sieve, which further increases the shear force borne by the sieve bar 10 . The equipment runs for a few days and just exceeds the bearing limit of the sieve bar 10, resulting in breakage.

Utility model content

In order to overcome the above-mentioned shortcomings of the prior art, the utility model provides a cantilever vibrating screen screening device for coking coal, which can overcome the above-mentioned shortcomings of poor screening efficiency and short service life, so that the screening effect is significantly improved, and the screen bar Extended service life.

The technical scheme adopted by the utility model to solve the technical problem is: a cantilever vibrating screen screening device for coking coal, which includes a main frame and a side coal retaining plate that is welded to the main frame and is located on the side of the main frame, and the front end of the main frame There is a gate-shaped steel beam, the root of the screen bar is welded and fixed on the upper end of the gate-shaped steel beam, and a buffer rubber pad is installed on the outside of the gate-shaped steel beam. On the main frame below the end of the screen bar, a vertical The sieve bar layout direction adopts the amplitude adjustment rod made of DN25mm 60Mn material thick leather round tube.

The sieve bars are φ10mm stainless steel bars with a length of 550mm, and the gap between the sieve bars is 7mm.

A raised buffer rubber pad baffle is arranged on the outer side of the buffer rubber pad.

The beneficial effects of the utility model are: by increasing the diameter of the sieve bars to 10mm, using stainless steel sieve bars to avoid excessive wear and corrosion; increasing the support of the glyph-shaped steel beams that can pass through the sieve bars in parallel, only at the root circumference of the sieve bars Welding and fixing, the welding area is larger than the original welding area, but the stress damage is much smaller, and the buffer rubber pad is installed on the other side to reduce the shear moment caused by the impact of falling coking coal on the screen bars; after process tests, the gap between the screen bars is adjusted to 7mm, And increase the amplitude adjustment rod. Through the above improvements, the screening effect is significantly improved; the service life of the screen bar is extended to more than one quarter, and it can effectively avoid the risk of the breakage of the screen bar and the threat of subsequent processes to cause production stoppage. It is used in cantilever vibrating screens When it is up, the screening effect is significantly improved, and the service life of the screen bar is extended, which is conducive to safe production, making the cantilever vibrating screen a better choice for coking coal screening.

Description of drawings

Fig. 1 is a schematic diagram of the facade of a cantilever vibrating screen with two layers of screens;

Figure 2 is a three-dimensional schematic diagram of the screen surface of the original cantilever vibrating screen;

Fig. 3 is a schematic diagram of the screen surface of the original cantilever vibrating screen;

Fig. 4 is a side view of the original cantilever vibrating screen;

Fig. 5 is a schematic diagram of the screen surface of the utility model cantilever vibrating screen;

Fig. 6 is a side view of the utility model cantilever vibrating screen;

Fig. 7 is a three-dimensional schematic view of the screen surface of the cantilever vibrating screen of the present invention.

In the figure: 1-vibration box, 2-screen surface, 3-powdered coal connecting plate, 4-fine powder chute, 5-main chute, 6-main frame, 7-gate-shaped steel beam, 8-buffer rubber pad, 9-side coal retaining plate, 10-sieve bar, 11-amplitude adjusting rod.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Referring to Fig. 1, Fig. 5 to Fig. 7, a cantilever vibrating screen screening device for coking coal includes a main frame 6 and a side coal retaining plate 9 welded to the main frame 6 and located on the side of the main frame 6, the main frame 6 The front end is provided with a glyph-shaped steel beam 7, and the root portion of the sieve bar 10 is welded and fixed on the upper end of the glyph-shaped steel beam 7 outside. The sieve bar 10 is a stainless steel bar with a length of φ10 mm and a length of 550 mm. The gap between the sieve bars 10 is 7 mm. A buffer rubber pad 8 is installed on the outside of the door-shaped steel beam 7, and a raised buffer rubber pad 8 baffle plate is arranged on the outside of the buffer rubber pad 8. On the main frame 6 below the screen bar 10 ends, a welded The amplitude adjusting rod 11 that adopts the 60Mn material thick-skinned round tube of DN25mm to make of screen bar 10 arrangement direction.

When in use, after the coking coal enters the cantilever vibration box 1, it reaches the screen surface 2 of the cantilever vibrating screen, and part of the fine coal falls from the gap of the screen bar 10 onto the pulverized coal connecting plate 3, and then falls into the fine powder chute 4, and the rest The coal flows to the opposite cantilever vibrating screen surface 2 for re-screening, and the coal on the screen passes through the main chute 5 and then reaches the pulverizer for crushing.

The utility model increases the diameter of the screen bar 10 to 10 mm, and adopts the stainless steel screen bar 10 to avoid excessive wear and corrosion; it increases the support of the glyph-shaped steel beam 7 that can pass through the screen bar 10 in parallel, only at the circumference of the root of the screen bar 10 Welding and fixing, the welding area is larger than the original welding area, but the stress damage is much smaller, and the buffer rubber pad 8 is installed on the other side to reduce the shear moment of the screen bar 10 to withstand the impact of falling coking coal; after the process test, the gap between the screen bars 10 is adjusted 7mm, and increase the amplitude adjustment rod 11. Through the above improvements, the screening effect has been significantly improved; the service life of the screen bar 10 has been extended to more than one quarter, and the risk of breaking and falling off of the screen bar 10, which threatens the follow-up process and resulting in production stoppage, can be effectively avoided. When used on a cantilever vibrating screen, the screen The separation effect is obviously increased, and the service life of the screen bar 10 is prolonged, which is conducive to safe production, making the cantilever vibrating screen a better choice for coking coal screening.

Claims (3)

1. A cantilever vibrating screen screening device for coking coal, which is characterized in that: it comprises a main frame and is welded with the main frame to be connected with a side coal baffle on the side of the main frame, and the front end of the main frame is provided with a glyph steel beam, The root of the sieve bar is welded and fixed on the upper end of the outer side of the glyph-shaped steel beam, and a buffer rubber pad is installed on the outer side of the gabled-shaped steel beam. Amplitude adjustment rod made of 60Mn material thick leather round tube. 2. The cantilever vibrating screen screening device for coking coal as claimed in claim 1, characterized in that: the sieve bars are stainless steel bars with a length of φ10 mm and a length of 550 mm, and the gap between the sieve bars is 7 mm. 3. The cantilever vibrating screen screening device for coking coal according to claim 1, characterized in that: a raised buffer rubber pad baffle is provided outside the buffer rubber pad.