CN203750832U - Novel hydraulic classification two-section arc screen - Google Patents

Abstract

The utility model discloses a novel hydraulic grading two-stage arc screen, comprising a screen box, a feed distribution box is arranged on the upper part of the screen box, an arc screen surface is arranged inside the screen box, the arc screen surface is respectively a first-stage arc screen surface and a second-stage arc screen surface from top to bottom, the upper end of the first-stage arc screen surface is connected to the discharge port of the feed distribution box, an intermediate material collecting trough is arranged between the lower end of the first-stage arc screen surface and the upper end of the second-stage arc screen surface, a conical perforated sieve plate is arranged at the bottom of the intermediate material collecting trough, a water flow supplement pipe is connected below the conical perforated sieve plate, and an underflow discharge valve is arranged at the center of the conical perforated sieve plate. The utility model divides the sieve surface into two sections, an upper and lower section, and an intermediate material collecting trough is added between the two sections of the sieve surface, and an ascending water flow with a certain flow rate is provided in the intermediate material collecting trough, thereby overcoming the disadvantage of the traditional arc screen that the moisture of the material is quickly cut through the sieve and affects the transportation, and can timely collect the retained materials on the sieve surface, prevent the occurrence of material accumulation, and ensure the effective utilization rate of the sieve surface.

Description

A new type of hydraulic grading two-stage curved screen

technical field

The utility model relates to the technical field of mineral processing equipment, in particular to a new two-stage screening device with large processing capacity, high screening efficiency, and relying on rising water flow to prevent material accumulation.

Background technique

The operation of dividing the mixture of different particle sizes into various particle size levels with a screen surface with holes is called screening. Screening operations are widely used in ore dressing, coal preparation, construction, chemical industry, light industry and other departments. According to the structure and motion of the screen surface, the commonly used screening machines at home and abroad can be divided into the following types: fixed screen, drum screen, vibrating screen, centrifugal screen, relaxation screen, etc. Among them, the curved screen is a kind of fixed screen, which has simple structure, easy installation, long service life, especially no power consumption, no moving parts, low equipment cost and use cost, and is widely used in screening operations, mainly for Material dehydration, desliming, deintermediation, coal slime recovery, etc. in coal, metallurgy, and chemical industries. The screen surface of the curved screen is arc-shaped along the direction of the material flow on the screen, and the screen bar is perpendicular to the direction of the material flow on the screen. These sharp cutting edges are good for cutting moisture from the material flowing on the screen surface. The incoming ore slurry is sent to the screen surface along the tangential direction through the diversion box, and the slurry forms a flat slurry layer, which is tightly attached to the screen surface for circular motion. The slurry layer is cut by the edge of the screen seam, under centrifugal force and Under the combined action of the slurry feeding pressure, the fine-grained components and water pass through the slurry layer and the sieve gap and become under-screen products.

However, the traditional curved screen has the following problems: when the material is fed from the bottom of the diverter box to the screen, it cannot be evenly distributed, and because of the obvious cutting effect at the beginning of the screen surface, the water in the material quickly penetrates the screen, and the transportability of the remaining material decreases, resulting in The accumulation of materials on the screen surface will cause blockage of the screen surface and seriously affect the screening effect.

Contents of the invention

Purpose of the invention: The purpose of this utility model is to overcome the problem of easy accumulation of materials in the traditional curved screen, and provide a new screening device with large processing capacity, high screening efficiency, and relying on rising water flow to prevent material accumulation.

In order to achieve the above object, the utility model adopts the following technical solutions:

A new type of hydraulic grading two-stage arc screen, including a screen box, a feed distribution box is arranged on the upper part of the screen box, and an arc-shaped screen surface is arranged inside the screen box. The upper end of the first arc-shaped screen surface is connected to the outlet of the feed distribution box, and the middle material collection tank is set between the lower end of the first-stage arc-shaped screen surface and the upper end of the second-stage arc-shaped screen surface. A conical perforated sieve plate is arranged at the bottom of the material collection tank, and a water supply pipe is connected under the conical perforated sieve plate, and an underflow discharge valve is set in the center of the conical perforated sieve plate, and the underflow discharge valve is connected to the discharge controller.

In the present utility model, preferably, an overflow weir is arranged at the notch of the intermediate material collection tank close to the side of the second-stage arc-shaped screen surface.

In the present utility model, preferably, the lower end of the section of arc-shaped screen surface is connected to the intermediate material collection tank through a blind plate, and the vertical height of the blind plate is slightly higher than the overflow weir.

In the present utility model, preferably, a flow regulating valve is arranged on the water flow supply pipe.

Compared with the prior art, the utility model has the following effects:

(1) The utility model divides the screen surface into upper and lower sections, and an intermediate material collection tank is added between the two sections of the screen surface to provide a certain flow rate of rising water in the intermediate material collection tank, which overcomes the traditional curved screen. The shortcoming that the moisture of the material is quickly cut through the screen and affects the transportation can collect the retained material on the screen surface in time to prevent the phenomenon of material accumulation and ensure the effective utilization of the screen surface. The rising water flow not only plays the role of transporting materials, but also makes the materials in the tank loose. layer, to separate the coarse-grained materials in time, which effectively reduces the wear of the lower screen surface, avoids repeated screening of coarse-grained materials, and improves the screening efficiency;

(2) The intermediate material collection tank provides an ascending water flow with an adjustable flow rate, and the material and the water flow form a relative motion, which makes this utility model have a certain sorting effect in addition to the screening and grading function, which reduces the impact of the material density difference on the screening. The impact of the process, reduce the content of mismatches, and improve the screening effect;

(3) An overflow weir is set at the notch of the intermediate material collection tank close to the side of the lower arc-shaped screen surface, and the lower end of the upper arc-shaped screen surface is connected to the intermediate material collection tank through a blind plate. The vertical height of the blind plate is slightly higher than the overflow weir, and the overflow The flow weir can reduce the flow velocity of the material on the lower screen surface, increase the movement time of the material, and improve the screening effect. Countercurrent phenomenon, to ensure that all the overflow enters the lower curved screen surface;

(4) The utility model divides the screen surface into upper and lower sections, and sets a material collection tank and an overflow weir between the two sections of the screen surface, which can appropriately increase the inclination angle of the screen surface, which not only improves the productivity, but also reduces the size of the screen. Covering an area, rational use of plant space, convenient for equipment layout and maintenance.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a view from direction A in Fig. 1 .

In the figure: 1-feeding conduit, 2-feeding distribution box, 3-screen box, 4-first-stage arc-shaped screen surface, 5-second-stage arc-shaped screen surface, 6-intermediate material collection tank, 7-overflow weir , 8-Water flow supplementary pipe, 9-Flow regulating valve, 10-Conical perforated sieve plate, 11-Blind plate, 12-Discharge controller, 13-Under flow discharge valve, 14-Bracket.

Detailed ways:

Below in conjunction with accompanying drawing, the utility model is further explained.

As shown in Figures 1 and 2, the novel hydraulic grading two-stage curved screen of the present invention includes a feed distribution box 2, a screen box 3 and a bracket 14, the screen box 3 is installed on the bracket 14, and the upper part of the screen box 3 is provided with a feeder. The distribution box 2 is connected with the feeding conduit 1 at the feed inlet of the distribution box 2 . The inside of the screen box 3 is equipped with a curved screen surface, and the curved screen surface is from top to bottom respectively one section of arc-shaped screen surface 4 and two sections of arc-shaped screen surface 5, the upper end of one section of arc-shaped screen surface 4 is connected to the outlet of the feeding distribution box 2 Connected, an intermediate material collection tank 6 is set between the lower end of one section of arc-shaped screen surface 4 and the upper end of two-section arc-shaped screen surface 5 . An overflow weir 7 is set at the notch of the intermediate material collection tank 6 close to the side of the second-section arc-shaped screen surface 5, and the lower end of the first-section arc-shaped screen surface 4 is connected to the intermediate material collection tank 6 through a blind plate 11. The vertical height of the blind plate 11 is slightly higher than Overflow weir 7. A conical perforated sieve plate 10 is set at the bottom of the intermediate material collection tank 6, and a water supply pipe 8 is connected to the bottom of the conical perforated sieve plate 10. An underflow discharge valve 13 is set at the center of the conical perforated sieve plate 13, and an underflow discharge valve 13 The valve body is an inverted cone with a cone angle of 30°-60°. The underflow discharge valve 13 is connected to the discharge controller 12, and the discharge controller 12 controls the switch of the underflow discharge valve 13 to realize the underflow discharge.

The working process of the utility model: the material fed from the feeding conduit 1 is fed through the feeding distribution box 2 at a certain speed along the tangential direction of the curved screen surface 4 of the curved screen. When the sieve surface is 4, centrifugal force is generated, and under the joint action of centrifugal force, friction force and gravity, it is cut by the edges of each sieve bar, and a large number of fine particles and water in the material quickly pass through the sieve bars to become undersieves. At the lower end of the sieve surface 4, the transportability of the material decreases due to a large amount of water passing through the sieve, and it is collected by the intermediate material collection tank 6 in time; the water fed by the water flow supply pipe 8 flows through the conical screen plate with holes 10 and enters the intermediate material collection tank 6 upwards , and a rising water flow is formed in the intermediate material collection tank 6, and the materials collected in the intermediate material collection tank 6 are loosely stratified under the action of the rising water flow, and the materials containing fine-grained components rise with the water flow and cross the overflow weir 7 into the The second-stage curved screen surface 5 continues to sieve, and the blind plate 11 can prevent the material from backflowing, ensuring that all the overflow enters the second-stage curved screen surface 5, the material under the second-stage curved screen surface 5 and the first-stage curved screen The material under the sieve on surface 4 is merged into the final under-sieve product, and the coarse-grained component continues to descend and is discharged from the bottom discharge port 13, and then merges with the material on the second-stage arc-shaped sieve surface 5 to form the final over-sieve product. The discharge controller 12 Control the discharge speed of the underflow discharge valve 13, thereby ensuring the stability of the feeding of the second-stage arc-shaped screen surface 5.

Utilizing the curved screen device of the utility model can effectively prevent the accumulation of materials on the screen surface, improve the effective utilization rate of the screen surface, improve the screening efficiency, and ensure the screening effect.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the scope of protection of the present utility model.

Claims (4)

1. A new hydraulic grading two-stage curved screen, including a screen box (3), a feed distribution box (2) is set on the upper part of the screen box (3), and a curved screen surface is set inside the screen box (3), which is characterized in that : The arc-shaped screen surface is divided into one section of arc-shaped screen surface (4) and two sections of arc-shaped screen surface (5) from top to bottom, and the upper end of one section of arc-shaped screen surface (4) is discharged from the feeding distribution box (2) The middle material collection tank (6) is set between the lower end of the first arc-shaped screen surface (4) and the upper end of the second-section arc-shaped screen surface (5), and a conical perforated sieve plate ( 10), the bottom of the conical perforated sieve plate (10) is connected with the water flow supply pipe (8), the center of the conical perforated sieve plate (10) is provided with an underflow discharge valve (13), and the underflow discharge valve (13) is connected to the drain Material controller (12) is connected. 2. A new type of hydraulic grading two-stage curved screen according to claim 1, characterized in that an overflow is provided on the side of the intermediate material collection tank (6) close to the second-stage curved screen surface (5) Weir (7). 3. A new type of hydraulic grading two-stage curved screen according to claim 2, characterized in that: the lower end of the one-stage curved screen surface (4) is connected to the intermediate material collection tank (6) through a blind plate (11) , the vertical height of the blind plate (11) is slightly higher than the overflow weir (7). 4. A new type of hydraulic grading two-stage curved screen according to claim 1, characterized in that: a flow regulating valve (9) is set on the water flow supply pipe (8).