CN111992488B

CN111992488B - Composite vibrating screen screening device and vibrating screen

Info

Publication number: CN111992488B
Application number: CN202010980319.0A
Authority: CN
Inventors: 李良晨; 邝伟; 刘奇; 孙庆忠
Original assignee: Jinan Zhongran Science & Technology Development Co ltd
Current assignee: Jinan Zhongran Science & Technology Development Co ltd
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2022-06-17
Anticipated expiration: 2040-09-17
Also published as: CN111992488A

Abstract

The invention relates to the field of vibrating screens, in particular to a composite vibrating screen screening device and a vibrating screen, which can improve screening efficiency and have better control capability on materials with standard exceeding sizes. A composite vibrating screen screening device comprises a mounting frame, an upper screen and a lower screen, wherein the upper screen and the lower screen are arranged in a separated mode, and the upper screen comprises a plurality of screen rods arranged in parallel; one end of the sieve rod is connected with the mounting frame and is a connecting end, the other end of the sieve rod is suspended and is a cantilever end, and the height of the cantilever end is lower than that of the connecting end; the lower screen is provided with a plurality of screen holes and is fixedly arranged on the mounting frame. The invention has the advantages of both the cantilever screen and the polyurethane screen.

Description

Composite vibrating screen screening device and vibrating screen

Technical Field

The invention relates to the field of vibrating screens, in particular to a composite vibrating screen screening device and a vibrating screen.

Background

In the prior art, the screen used for the sinter shaker under the blast furnace trough of the steel plant and iron plant is usually a cantilever screen, and a polyurethane screen is partially used. The cantilever screen is mainly characterized in that the screen holes with constantly high-frequency changing shapes and sizes replace other screen holes with constantly unchanged shapes and sizes, so that the technical problem that the screening efficiency is reduced due to the fact that critical particles are blocked by the other screen holes which are difficult to solve is effectively solved, the screening efficiency and the processing capacity are improved, particularly, the screening of a sintering ore vibrating screen below a blast furnace slot of an iron mill is about 5mm, the accuracy of charged materials is improved, the coke ratio of a blast furnace is reduced, and the blast furnace coefficient is greatly improved. However, cantilever screens have the following disadvantages:

because the sieve pores of the cantilever sieve are long-strip pores with high-frequency change, part of long-strip or sheet materials with the size larger than the sieve pores enter undersize during working, the overstandard coefficient of the undersize is increased, and the material waste is caused; the sintered ore vibrating screen under part blast furnace groove adopts the polyurethane screen cloth, and the size and the shape of sieve mesh are relatively fixed, and the material polyurethane of screen cloth is flexible material, and the shape of sieve mesh has slight change in work, and the technological problem in critical granule card hole that can be better solved also has stronger control ability to the undersize material that exceeds standard. However, the opening rate of the screen is lower, and compared with a cantilever screen with the same screening area, the capacity of processing materials is only half of that of the cantilever screen, which seriously influences the circulation of a blast furnace material feeding system. And because of the problem of the material, when the screen mesh made of the polyurethane material is used alone, the use life is short due to factors such as impact and friction of larger particles in the material.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the composite vibrating screen screening device and the vibrating screen, which can better control the oversize materials under the premise of keeping high screening efficiency and high processing capacity of the cantilever screen.

The scheme provided by the invention is as follows:

a composite vibrating screen screening device comprises a mounting frame, an upper screen and a lower screen, wherein the upper screen and the lower screen are arranged in a separated mode, and the upper screen comprises a plurality of screen rods arranged in parallel;

one end of the sieve rod is connected with the mounting frame and is a connecting end, the other end of the sieve rod is suspended and is a cantilever end, and the height of the cantilever end is lower than that of the connecting end;

the lower screen is provided with a plurality of screen holes and is fixedly arranged on the mounting frame.

The upper screen adopts cantilever screen cloth structure, can once sieve the material, make full use of cantilever screen cloth screening efficiency height, advantage that throughput is big, and to the material that exceeds standard that the cantilever screen cloth is difficult to control, then carry out secondary screening through lower floor's screen cloth, because the material granule of secondary screening is less, and the quantity reduces more than half, consequently lower floor's screen cloth is in the performance to the advantage that undersize material controllability is stronger, it is not enough to have solved the throughput simultaneously, defect that life is shorter.

Preferably, the screen cloth further comprises a baffle, the baffle is located between the upper layer screen cloth and the lower layer screen cloth, the lower end of the baffle is fixedly connected with the lower layer screen cloth below the cantilever end, and the upper end of the baffle points to the upper side of the lower layer screen cloth. Because the screening plant is in the vibration environment at the during operation, the flow direction of material can be restricted to the great inclination of upper screen cloth by self, and the lower floor screen cloth is because the material of adoption is different, the handling capacity is also different, consequently, be not convenient for set up great inclination, but the flow direction of material is difficult to control again to the screen cloth at less inclination, if the material flows to the opposite direction, then can't sieve, and the baffle can effectively seal the one end of lower floor screen cloth, ensure that the material flows and carries out abundant screening along the direction that the screening needs.

Preferably, the screen cloth further comprises a middle guide plate, the middle guide plate is located between the upper screen cloth and the lower screen cloth, the middle guide plate is arranged obliquely, and one end, close to the cantilever end, of the middle guide plate is higher than one end, close to the connecting end, of the middle guide plate. In the invention, the material flows in a fixed direction in the screening process, the material flow direction is the front direction, and the middle guide plate can guide the material screened by the upper-layer screen to the rear direction, so that the material can stay on the lower-layer screen for enough time when falling onto the lower-layer screen and moving forwards.

Preferably, the cantilevered end of the upper screen extends beyond the lower screen in the horizontal direction, at least beyond the effective screening portion of the lower screen. Ensure that the material can fall to the lower screen after being fully screened by the upper screen.

Preferably, the upper screen comprises a cross arm, the fixed end of the screen rod is connected with the cross arm, an upper guide plate is arranged above the cross arm, and the upper guide plate covers the cross arm. The upper guide plate can guide the materials falling to the screening device, so that the materials flow to the upper screen after being guided by the upper guide plate.

Preferably, the lower screen is a polyurethane screen or a rubber screen, and a plurality of screen holes are uniformly distributed in the lower screen. The polyurethane or rubber screen mesh is soft in texture and elastic, and has a screening effect and is not easy to block screen holes.

Preferably, the bottom of the lower-layer screen is provided with a support frame, and the support frame comprises a plurality of beams for supporting the lower-layer screen. The support frame can improve the intensity of lower floor's screen cloth, is difficult for appearing great deformation at the screening in-process, also makes the difficult quilt of lower floor's screen cloth destroyed.

The utility model provides a composite vibrating screen, includes a plurality of foretell composite vibrating screen screening plant, a plurality of screening plant distribute in not co-altitude, and the cantilever end of sieve stick is preceding in the extending direction of horizontal direction, and highly lower screening plant is located the place ahead of highly higher screening plant. A plurality of screening plant establish ties and form a whole on the shale shaker, can improve screening efficiency to be convenient for arrange on the shale shaker, make full use of space has reduced the production and processing degree of difficulty. In addition, the material particles screened by the upper screen are smaller, and the material staying on the upper screen is larger, so that when the material moves from the higher screening device to the lower screening device, the material with smaller particles is still positioned below, and the material with smaller particles can be screened by being in contact with the screen of the next group of screening devices more quickly and fully.

Preferably, the upper and lower screens of the higher screening device extend forward in a horizontal direction above the upper screen of the lower screening device. The material screened by the upper screening device needs to be ensured to reach the upper part of the screen of the lower screening device to ensure that the screening process is more complete.

The invention has the following beneficial effects:

1. the invention adopts the mode of combining the upper layer screen and the lower layer screen, not only exerts the high efficiency and high throughput of the cantilever screen, but also exerts the effective size standard control of the lower layer screen, and reduces the load of the lower layer screen after the cantilever screen is screened, and the lower layer screen does not need to screen large-size or heavy-weight materials, thereby prolonging the service life;

2. through the design of the baffle plate, the guide plate and other devices, the leakage of materials can be avoided, the materials can be fully screened on the lower-layer screen, and the utilization rate of the screen is improved;

3. the screening devices are installed in series and arranged in a step shape, a certain height difference exists in the vertical direction when materials enter the next screening device from the previous screening device, the materials fall in a parabolic shape under the elastic action of the upper screen, the throwing distance of larger particles is far, the throwing distance of smaller particles is close, and therefore the smaller particles occupy the lower part of a material layer when the materials fall to the next screening device, layering of the materials is rapidly completed, and the small particles in the materials fully contact with the screen to complete screening. This is an advantage that neither generally planar screens have.

4. The material is at the screening in-process, and the higher screening plant's of height upper screen mesh screen unloading thing is through the screening of lower floor's screen cloth after, and the upper screen mesh that gets into next lower screening plant of height along lower floor's screen cloth continues to sieve, and this kind of structural arrangement can be to the tiny particle in the material screening many times, improves screening precision and screening efficiency greatly. Meanwhile, the situation that more and more materials are accumulated on the lower-layer screen of the screening device is avoided, so that the materials on the lower-layer screens of the screening devices connected in series are kept in equal thick layers, and the high screening efficiency of the lower-layer screens is guaranteed. This is an advantage not found in typical double layer screen arrangements.

Drawings

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of the construction of the screening device of the present invention;

FIG. 2 is a schematic view of the shaker of the present invention;

fig. 3 is an enlarged schematic view at a in fig. 2.

In the figure: 1-mounting frame, 2-upper screen, 3-lower screen, 4-baffle, 5-middle guide plate, 6-cross arm, 7-upper guide plate, 8-support frame, 9-vibrating screen body, 21-connecting end, 22-cantilever end, 91-vibration source and 92-side plate.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, the present embodiment provides a composite vibration sieve screening device, including mounting bracket 1, upper screen cloth 2 and lower floor's screen cloth 3, upper screen cloth 2 sets up with lower floor's screen cloth 3 separation, and upper screen cloth 2 includes a plurality of parallel arrangement's sieve stick, and sieve stick one end is connected with mounting bracket 1, and for link 21, the other end is unsettled, for cantilever end 22, cantilever end 22 highly is less than link 21, and lower floor's screen cloth 3 is equipped with a plurality of sieve meshes, and is fixed to be set up on mounting bracket 1. In the horizontal direction, the cantilever end 22 of the upper screen 2 extends over the effective screening portion of the lower screen 3.

The invention is also provided with a baffle 4, the baffle 4 is positioned between the upper layer screen 2 and the lower layer screen 3, the lower end of the baffle 4 is fixedly connected with the lower layer screen 3 below the cantilever end 22, and the upper end points to the upper part of the lower layer screen 3. Be equipped with middle part baffle 5 on the mounting bracket 1, middle part baffle 5 is located between upper screen cloth 2 and the lower floor screen cloth 3, and middle part baffle 5 inclines to set up near the middle part of upper screen cloth 2, and the one end that middle part baffle 5 is close to cantilever end 22 is higher than the one end that is close to link 21. The upper-layer screen 2 comprises a cross arm 6, a fixed end 21 of a screen rod is connected with the cross arm 6, an upper guide plate 7 is arranged above the cross arm 6, and the upper guide plate 7 covers the cross arm 6.

The lower layer screen 3 is a polyurethane screen or a rubber screen, and a plurality of screen holes are uniformly distributed. The bottom of lower floor's screen cloth 3 is equipped with support frame 8, and support frame 8 includes a plurality of crossbeams that support lower floor's screen cloth 3.

As shown in fig. 2 and 3, a composite vibrating screen includes a plurality of the above-mentioned composite vibrating screen screening devices, the screening devices are distributed at different heights and are arranged in series on a vibrating screen body 9, and the vibrating screen body 9 is provided with a vibration source. The cantilevered end 22 of the screen bar extends horizontally forward with the lower level screening device being forward of the higher level screening device. In the horizontal direction, the upper screen 2 and the lower screen 3 of the higher screening device extend forward to above the upper screen 2 of the lower screening device.

The working principle of the invention is as follows:

when passing through the screening device, the material firstly falls on the upper screen 2 and is screened by the upper screen 2, and oversize materials on the upper screen 2 flow along the upper screen 2 and flow to the next screening device under the limitation of the side plate 92. And the undersize material of the upper screen 2 partially flows backwards after being guided by the middle guide plate 5 and stops at the baffle 4, and then is secondarily screened by the lower screen 3, and partially directly falls into the lower screen 3 for secondary screening. There is baffle 4 to block 3 rear of lower floor's screen cloth, and there are mounting bracket 1 and shale shaker body 9 to block both sides, and consequently the oversize thing after the screening of lower floor's screen cloth 3 can automatic flow to next screening plant, and its screen cloth thing has accomplished screening work from the below discharge. The material flowing to the next screening device is firstly guided by the upper guide plate 7 and then flows to the upper screen 2 of the next screening device for the next screening.

Although the present invention has been described in detail in connection with the preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a compound shale shaker screening plant which characterized in that: the screen comprises a mounting frame, an upper screen and a lower screen, wherein the upper screen and the lower screen are arranged separately, the lower screen is arranged horizontally, the upper screen is arranged obliquely, and the upper screen comprises a plurality of parallel screen rods;

the lower-layer screen is provided with a plurality of screen holes and is fixedly arranged on the mounting frame; the lower-layer screen is a polyurethane screen or a rubber screen, and a plurality of screen holes are uniformly distributed;

the baffle is positioned between the upper-layer screen and the lower-layer screen, the lower end of the baffle is fixedly connected with the lower-layer screen below the cantilever end, and the upper end of the baffle points to the upper part of the lower-layer screen;

the middle guide plate is positioned between the upper-layer screen mesh and the lower-layer screen mesh, the middle guide plate is obliquely arranged, and one end, close to the cantilever end, of the middle guide plate is higher than one end, close to the connecting end, of the middle guide plate.

2. A composite vibratory screen apparatus as claimed in claim 1, wherein: in the horizontal direction, the cantilever end of the upper layer screen extends for a length exceeding that of the lower layer screen.

3. A composite vibratory screen apparatus as set forth in claim 1, wherein: the upper screen comprises a cross arm, the fixed end of the screen rod is connected with the cross arm, an upper guide plate is arranged above the cross arm, and the upper guide plate covers the cross arm.

4. A composite vibratory screen apparatus as set forth in claim 1, wherein: the bottom of the lower-layer screen is provided with a support frame, and the support frame comprises a plurality of cross beams for supporting the lower-layer screen.

5. A composite vibrating screen is characterized in that: a composite vibratory screen apparatus as claimed in any one of claims 1 to 4 including a plurality of screening devices distributed at different heights, the cantilevered ends of the screen rods extending in a horizontal direction forwardly of the screening devices, the lower height screening devices being located forwardly of the higher height screening devices.

6. A composite vibratory screen as set forth in claim 5 wherein: in the horizontal direction, the upper and lower screens of the higher screening device extend forward to above the upper screen of the lower screening device.