CN104785437A - A bar vibrating screen - Google Patents

Abstract

The invention provides a bar type vibrating screen which comprises a base, a rack, springs, screen bodies, vibration exciters and bar type screens, wherein the bar type screens are arranged in the screen bodies, and at least two bar type screens are arranged in a step shape according to the flow direction of materials; the bar sieve comprises a cross beam, an upper layer sieve sheet and a lower layer sieve sheet; the upper-layer sieve sheet consists of short bars and long bars, one end of each short bar is fixed on the cross beam through an elastic material; the other ends of the short bars and the long bars are cantilever arms, and the short bars and the long bars are arranged alternately; the long bars are arranged in parallel, and the short bars are tilted upwards relative to a plane formed by the long bars arranged in parallel; the lower-layer sieve sheet is composed of lower-layer bars, one end of each lower-layer bar is fixed to the corresponding beam through elastic materials, the other ends of the lower-layer bars are cantilever arms, the lower-layer bars are arranged in parallel, and the cantilever ends of the bars of the bar sieve incline downwards. The vibrating screen has high screening efficiency and screening precision, and the screen is not easy to block.

Description

A bar vibrating screen

technical field

The invention relates to a screening device applied in the field of metallurgy, in particular to a bar type vibrating screen with high screening precision.

Background technique

Rod vibrating screen is a commonly used material screening tool. Rod sieve has the advantages of high screening efficiency and not easy to block holes, but many materials larger than the classification limit will pass through the sieve and fall into the sieve. , its accuracy is poor.

Contents of the invention

The invention aims at the problems in the prior art, and provides a rod type vibrating screen with high screening precision and high efficiency.

The present invention is achieved through the following technical solutions:

A bar type vibrating screen includes a base, a frame, a spring, a screen body, a vibrator and a bar screen, the frame is fixedly installed on the base, and the spring is installed on the frame , the sieve body is supported on the spring, the vibrator is installed on the sieve body, and the bar sieve is installed inside the sieve body, it is characterized in that: the bar sieve has at least two One, set in a ladder shape according to the flow direction of the material; the bar screen includes a beam, an upper screen and a lower screen; the upper screen is composed of a short bar and a long bar with one end fixed on the beam by an elastic material The other ends of the short rods and the long rods are cantilevered, and the short rods and the long rods are arranged alternately; the long rods are arranged in parallel, and the short rods are arranged in parallel with respect to the The plane formed by the long rods is upturned; the lower sieve sheet is composed of lower rods with one end fixed on the beam by elastic material, the other end of the lower rods is cantilevered, and the lower rods are arranged in parallel. The bar cantilever end of the bar sieve is inclined downward.

More specifically, the plane tilt angle formed by the short rods relative to the long rods arranged in parallel is 1-3°.

More specifically, there are two vibrators that rotate in opposite directions.

More specifically, the short rods and the long rods have the same diameter; the lower rods have different diameters and different lengths.

When the rod-type vibrating screen of the present invention is working, two motors drive two sets of vibrators to rotate in opposite directions, and the generated exciting force is offset on the line connecting the centers of the two sets of vibrator systems, while in the vertical direction The upper superposition forms a resonance resultant force, which passes through the center of mass of the sieve body. The generated exciting force is transmitted to the screen body, so that the whole vibrating screen produces biaxial linear vibration.

The rod produces harmonic vibration under the action of the exciter, and the actual vibration direction is not perpendicular to the rod, but has a certain angle with the rod due to the deflection swing. When the vibration intensity of the vibrating screen is constant, the raised short rod ensures the throwing movement of the top layer of material, that is, it provides a "springboard" for the large particle material. The sieve is elastic and has secondary vibration characteristics, and the sieve is distributed layer by layer in a ladder shape, which is very conducive to the stratification of the sieve material. When the material group composed of particles with different particle sizes is thrown by the sieve, the large particle material has a greater throwing strength due to its proximity to the sieve, and the throwing distance is longer than that of the small particles, and is thrown from the upper sieve to the lower sieve. , the formation of small particles in the back, large particles in front. Materials with larger particle size are easily bounced by the tilted rods during the falling process, and materials with smaller particle size are easy to fall into the bottom of the material layer, which accelerates the layering of materials during the screening process. If this continues to move forward, the small particles behind will move into the gap under the large particles in front, thus forming a layered state where small particles are at the bottom and large particles are at the top.

Beneficial effect:

1. Materials with larger particle size are easily bounced by the short sticks during the falling process, and materials with smaller particle size are easy to fall into the bottom of the material layer, which accelerates the layering of materials during the screening process and improves the screening efficiency. Separation efficiency and screening accuracy.

2. The cantilever end of the bar produces secondary vibration under the vibration of the screen body and the impact of the material, and the vibration is mainly upward, thereby producing an anti-blocking effect and a strong loosening effect on the material.

Description of drawings

Fig. 1: a structural schematic diagram of a rod type vibrating screen of the present invention;

Fig. 2 : the rod sieve top view in the structure of the present invention;

Fig. 3: the bar sieve side view in the structure of the present invention;

Figure 4: Schematic diagram of the movement of large and small particle materials on the sieve.

Detailed ways

The present invention will be further described below through specific embodiments.

As shown in Figure 1, the vibrating screen used for screening high-alkalinity sinter includes a base 1, a frame 2, a spring 3, a screen body 4, an exciter 5 and a screen 6, and the frame 2 is fixedly installed on the base 1, the spring 3 is installed on the bracket 2, the screen body 4 is supported on the spring 3, the vibrator 5 is installed on the screen body 4, and the sieve 6 is installed inside the sieve body 4; there are 9 sieves 6, According to the flow direction of the material, it is stepped and arranged inclined relative to the horizontal plane. Used three kinds of different sieves 6 in the present embodiment, and its concrete structure and screening result are as follows:

1. The upper bar sieve and the lower comb sieve.

The upper bar sieve bars are arranged in parallel with a gap of 12mm; the lower layer of comb teeth has a gap of 6mm. According to statistics, the sintered ore particle size is about 3.21% in the furnace with a particle size of 0-6mm.

2. Double-layer parallel bar vibrating screen.

The upper sieve is composed of short rods and long rods arranged in parallel on the beam with one end fixed by elastic material, with a gap of 6mm, the length of the long rod is 308mm, the length of the short rod is 285mm, and the diameter of both is 8mm; the lower layer The sieve is composed of rods of different lengths arranged in parallel, with a diameter of 4mm and a gap of 4mm between the rods.

See Table 1 for sampling and tracking of the size ratio of particles entering the furnace.

Table 1 The proportion of particles entering the furnace after screening by double-layer parallel bar vibrating screen

It is concluded from Table 1 that the screening results are unstable and fluctuate greatly, and the particle size is 0-6mm. The powder content in the furnace is as follows: the maximum: 9.51%, the minimum: 2.06%, and the average: 3.76%.

3. Double-layer rod vibrating screen with short rods raised.

The rod sieve used this time is obtained by modifying the above-mentioned double-layer parallel rod vibrating screen, as shown in Figure 2, that is, the upper screen is composed of short rods arranged in parallel on the beam 9 with one end fixed on the beam 9 7 and long rods 8 are arranged alternately, the gap is 6mm, the long rods 8 are 308mm long, the short rods 7 are 285mm long, and the diameters of both are 8mm; the lower sieve is composed of rods of different lengths arranged in parallel. The diameter is 4mm, and the bar gap is 4mm.

The specific modification method is to lift the short rods 7 in the upper sieve, as shown in Figure 3, the angle of the short rods 7 relative to the plane formed by the long rods 8 is b, and the angle b is 2 in this embodiment. °. As shown in Figure 4, during the screening operation, the large particle 10 material has a greater throwing strength due to its proximity to the sieve, and the throwing distance is farther than that of the small particle 11. The stratification of the large particles 10 at the bottom layer on the upper layer improves the screening efficiency and precision.

See Table 2 for sampling and tracking of the particle size ratio in the furnace.

Table 2 The ratio of particles entering the furnace after screening by the double-layer rod vibrating screen with short rods tilted

It can be concluded from Table 2 that the screening results are relatively stable, and the proportion of powders with a particle size of 0-6 mm into the furnace is as follows: the maximum: 2.76%, the minimum: 2.20%, and the average: 2.45%.

4. Calculation of economic benefits

According to 1.1.1.4 of the "Blast Furnace Production Technology Manual" to increase the strength of the charge and optimize the particle size composition: domestic statistics show that: the powder with a particle size of the charge < 6 mm is reduced by 1%, and the utilization factor of the blast furnace is increased by 0.4%-1.0%. 0.5% lower than the ratio. Therefore, from 3.2% of the original sinter powder with a particle size of 0-6mm, it is reduced to 2.5%, a decrease of 0.7%. Calculation: the blast furnace utilization factor will increase by 0.5%-0.7%, and the coke ratio will decrease: 0.25%. At present, the utilization factor of 1# and 2# blast furnaces of JISCO Group Hongxing Iron & Steel Co., Ltd. is 2.2, so the utilization factor will be increased by about 2.4, with a daily increase of 560 tons of pig iron and an annual increase of about 200,000 tons. The coke ratio is reduced by 1.025 kg/ton of iron. At present, 1# and 2# blast furnaces produce 6,500 tons of iron per day, 6.66 tons of coke per day, and 2,398.5 tons of coke per year. Calculated at 1,000 yuan per ton of coke, the cost of pig iron is reduced throughout the year: About 2398500 yuan.

Claims (4)

1. a Bar strip type vibratory sieve, include base (1), frame (2), spring (3), sieve nest (4), vibrator (5) and rod sieve (6), described frame (2) is fixedly mounted on described base (1), described spring (3) is arranged in described frame (2), described sieve nest (4) is supported on described spring (3), described vibrator (5) is arranged on described sieve nest (4), it is inner that described rod sieve (6) is arranged on described sieve nest (4), it is characterized in that: described rod sieve (6) has two at least, stepped setting is flowed to by material, described rod sieve (6) comprises crossbeam (9), upper strata sieve and lower floor's sieve, described upper strata sieve is fixed on stub bar (7) on crossbeam (9) by one end by elastomeric material and long rod (8) forms, the other end cantilever of described stub bar (7) and described long rod (8), described stub bar (7) and described long rod (8) are alternately, described long rod (8) is arranged in parallel, and the plane that described stub bar (8) is formed relative to described long rod (8) arranged in parallel is upturned, lower floor's rod that described lower floor sieve is fixed on described crossbeam (9) by elastomeric material by one end forms, described lower floor rod other end cantilever, and described lower floor rod is arranged in parallel, and the rod cantilever end of described rod sieve (6) is downward-sloping.

2. a kind of Bar strip type vibratory sieve as claimed in claim 1, is characterized in that: it is 1-3 ° that described stub bar (7) tilts angle relative to the plane that described long rod (8) arranged in parallel is formed.

3. a kind of Bar strip type vibratory sieve as claimed in claim 1 or 2, is characterized in that: described vibrator (5) has two, does rightabout rotation.

4. a kind of Bar strip type vibratory sieve as described in claim 1-3 any one, is characterized in that: described stub bar (7) is identical with described long rod (8) diameter; Described lower floor rod diameter is different, and length is also different.