CN114950944B - Single layer banana sieve system with pre-stage deintermediation and post-stage classification for coal preparation - Google Patents

Abstract

The invention discloses a single-layer banana screen system for coal dressing, which comprises a single-layer banana screen and an undersize aggregate device, wherein the single-layer banana screen comprises four supporting seats fixedly connected with a mounting base, a buffer spring and a screen box, wherein the buffer spring and the screen box are arranged on the supporting seats: the side plate of the screen box is supported by a buffer spring; the front section sieve plate section at the bottom of the sieve box is divided into medium removing sieve plate sections, and medium removing sieve plates are arranged on the medium removing sieve plate sections to play a role in dewatering and removing media for coal; the rear section sieve plate section of the sieve box is a grading sieve plate section, and a medium removal sieve plate or a grading sieve plate can be selectively arranged on the grading sieve plate section to play a role in dewatering, medium removal or dewatering, medium removal and grading on coal; the screen box is connected with the driving vibration exciter unit; the single-layer banana screen system can be used for removing media and grading coal.

Description

Single layer banana sieve system with pre-stage deintermediation and post-stage classification for coal preparation

technical field

The invention relates to a banana sieve system for coal preparation, in particular to a banana sieve system for coal preparation with front-stage deintermediation and rear-stage classification.

Background technique

In the coal preparation system using a dense medium cyclone, it is necessary to remove the medium and classify the coal products. Generally, two methods are used for the separation and classification. One is to connect the separation and classification in series, and first use the separation screen for the separation. Dehydration, and then enter the grading sieve for grading; the second is to use a double-layer sieve, the upper layer is classified, and the lower layer is removed. If two vibrating sieves are used for dehydration and dehydration respectively, sufficient installation space is required in the washing workshop; if double-layer vibrating sieves are used for dehydration and dehydration, water spraying devices need to be installed on both layers. Due to the small layer spacing, production The process is not suitable for observation and operation, and the structure is more complicated and not suitable for maintenance. Moreover, in some coal preparation systems, the product structure will be adjusted according to the quality of the raw coal. Sometimes only deintermediation is required, and sometimes both deintermediation and grading are required; so the above methods are not easy to realize adjustment. For example, the main re-selection coal preparation process includes a first-stage dense medium main separation system gangue discharge process, and a second-stage heavy medium selection process. When the gangue is discharged and the washed mixed coal product is used as steam coal, the second-stage beneficiation system may not be turned on; when the low-gray clean coal product is washed as a coking coal blending product, the first-stage heavy medium main beneficiation system and the second-stage heavy medium beneficiation system All on. For the refractory coal that is co-generated with coal gangue and difficult to dissociate from clean coal, when washing coking coal blending products, the coarse clean coal mainly selected by the first stage of dense media needs to be further classified, crushed and dissociated before entering the second stage of dense media. flow device, so as to improve the clean coal quality and recovery rate. Therefore, when the production system produces washing and coking coal blending products, the coarse and clean coal needs to be classified after dehydration and de-mediation with the media removal screen, and the coarse and clean coal with large particle size is crushed, and then enters the second-stage dense medium cyclone; For thermal coal, it is only necessary to use a media removal sieve to remove media and dehydrate the coarse and clean coal to form a thermal coal product without classification. Therefore, in a similar production system, the de-mediation, dehydration, and grading of the de-medium sieve are designed in one place, and have a switching function. Using a single-layer vibrating screen to solve the de-medium, dehydration and grading problems will help simplify the layout of production equipment. Save space in the production workshop and facilitate daily maintenance.

Contents of the invention

One object of the present invention is to solve the technical problems existing in the prior art, and propose a single-layer banana sieve system for coal preparation with front-stage deintermediation and rear-stage grading. The single-layer banana sieve system can both de-intermediate coal It can also be graded.

In order to solve the above problems, the present invention proposes a single-layer banana sieve system for coal preparation with front stage deintermediation and rear stage classification. The sieve includes: four supporting seats, the supporting seats are fixedly connected with the installation base; buffer springs, the buffer springs are installed on the supporting seats; the screen box, the side plate of the screen box Supported by the buffer spring; the front sieve plate section at the bottom of the screen box is divided into a de-medium sieve plate section, and the de-medium sieve plate is installed on the de-medium sieve plate section to dehydrate and de-intermediate the coal; The plate section is a grading sieve plate section, and the grading sieve plate section can be optionally equipped with a dehydration sieve plate or a grading sieve plate, which can dehydrate and dehydrate the coal or dehydrate and degrade the medium; drive the exciter unit, and the drive The exciter unit is connected to the screen box; the under-screen collection device includes a qualified medium funnel, a thin medium funnel, and an under-screen chute, and the qualified medium funnel and the thin medium funnel are arranged on the de-medium sieve plate Below the section, the thin medium funnel is set behind the qualified medium funnel; the under-screen chute is set under the grading sieve plate section, and the thin medium funnel is set behind the qualified medium funnel; The under-screen chute is arranged below the grading sieve plate section, and the front side of the upper section of the under-screen chute is provided with a through opening to communicate with the rear end of the thin medium funnel. The flap is rotatably connected to the side wall of the chute under the screen; the flap can be turned forward to block the through opening and block the communication with the thin medium funnel. After turning over in place, the chute under the screen can be stopped.

With the technical scheme of the present invention, if only the single-layer banana sieve is required for dehydration and de-intermediation, the grading sieve plate section of the single-layer banana sieve is equipped with a de-intermediation sieve plate, and the turning sieve inside the under-screen chute The plate flips back into place to block the underscreen chute and communicate the underscreen chute with the dilute media funnel. In this way, the material on the screen obtained after dehydration and de-intermediation of the single-layer banana sieve is the material after dehydration and de-intermediation; After the coal enters the single-layer banana sieve for dehydration and deintermediation, a coarse clean coal product is obtained, which can be used as a thermal coal product. And the thin medium under the sieve of the grading sieve plate section of the single-layer banana sieve rear section enters the chute under the screen and enters the thin medium funnel, and after converging with the thin medium from the front section of the single-layer banana sieve, Transported to the rougher thin media bucket in the washing system; the qualified medium under the sieve section of the de-medium sieve section in the front section of the single-layer banana sieve enters the qualified medium funnel and is transported to the qualified medium barrel in the washing system .

Adopting the technical scheme of the present invention, if both the dehydration and deintermediation of the single-layer banana sieve and its classification are required, the grading sieve plate section of the single-layer banana sieve is equipped with a grading sieve plate, and the sieve gap of the grading sieve plate is larger than The sieve gap of the de-mediation sieve plate; the flap inside the under-screen chute is turned forward to block the through opening, closes the connection channel with the thin medium funnel, and opens the mixing barrel leading to the washing system channel. Like this, through described single-layer banana sieve dehydration and deintermediation and the material with larger particle size obtained after classification is discharged from described single-layer banana sieve; The qualified medium funnel is transported to the qualified medium barrel in the washing system, and then recycled. The extracted thin medium enters the thin medium funnel and is transported to the thin medium barrel in the washing system. After further magnetic separation, the obtained The qualified medium is recycled, and the obtained tailings enter the slime water treatment system for further treatment. Taking the main re-selection system of the dense medium cyclone as an example, when washing low-ash coking coal blending, the coarse and clean coal separated by the rough separation and dense medium cyclone of the first stage of the heavy medium main separation system passes through the single-layer banana The sieve is used for dehydration, deintermediation, and classification. The large-sized coarse clean coal on the sieve of the single-layer banana sieve enters the crusher for crushing, and the crushed coarse clean coal with a small particle size passes through the discharge chute under the crusher. Enter the mixing tank; the small-sized coarse clean coal under the grading sieve plate section of the single-layer banana sieve is exported into the mixing tank in the washing system through the under-screen chute. The small-sized coarse clean coal that enters the mixing tank enters the second-stage dense medium beneficiation system for beneficiation to obtain qualified low-ash clean coal that can be used as coking coal blending.

Further optionally, the single-layer banana sieve system for coal preparation with front-stage deintermediation and rear-stage classification also includes a bifurcated chute, the bifurcated chute is arranged behind the screen of the single-layer banana sieve, and the bifurcated The upper opening of the chute is connected with the discharge opening on the screen of the single-layer banana sieve, and two outlets are arranged below the bifurcated chute, and the two outlets are connected with two downstream equipment; The inside of the fork chute is provided with an overturning guide plate at the fork, and the overturning guide plate is rotatably connected with the side wall of the fork chute, and the overturning guide plate blocks the material and the The passages of the two outlets. With this scheme, the materials on the single-layer banana sieve can be easily imported into two devices, such as installing a reloading scraper conveyor and a crusher behind the single-layer banana sieve, and the two below the bifurcated chute Two outlets are connected with these two downstream equipments; when the material on the screen does not need to be crushed, the material on the single-layer banana sieve is introduced into the reloading scraper machine and can be transported to the storage place; if the material on the screen needs to For crushing, the direction of the turning material guide plate inside the bifurcated chute is changed, and the material on the screen is transferred to the crusher for further crushing.

Specifically, according to an embodiment of the present invention, a flap manipulation device is provided outside the underscreen chute, and the flap manipulation device is connected with the rotation shaft of the flap and drives the flip of the flap. A material guide plate manipulating device is provided outside the bifurcated chute, and the material guide plate manipulating device is connected with the rotating shaft of the turning over material guiding plate and drives the overturning of the turning over material guiding plate; the turning plate The operating device is a hydraulic cylinder or an electro-hydraulic push rod or an electric push rod or a cylinder or a manually operated push rod device. The material guide plate manipulation device is a hydraulic cylinder or an electro-hydraulic push rod or an electric push rod or a cylinder or a manually operated push rod device.

Specifically, the sieve box of the single-layer banana sieve is divided into five sections from the feeding end to the sieve plate at the discharge end, and the inclination angles of the five-section sieve plates become smaller successively; The inclination angle difference is 4°, and the inclination angle of the sieve plate from the feed end to the discharge end is 25°, 21°, 17°, 13°, 9°, 5°, decreasing step by step.

Adopting the technical scheme of the present invention can achieve the following beneficial effects: (1) the single-layer banana sieve system for coal preparation uses a single-layer banana sieve system for front-stage deintermediation and rear-stage grading, and only needs to use a single-layer banana sieve to complete dehydration, deintermediation and classification, And it can realize only two functions of dehydration, dehydration, and three functions of dehydration and classification according to actual needs; (2) adopt the scheme of under-sieve aggregate device, but when the single-layer banana sieve is used for different purposes of dehydration, dehydration and classification , by changing the direction of the flap in the chute under the sieve, it is very convenient to realize the recovery of the materials and media under the sieve; (3) adopt the technical scheme of the front bifurcated chute with a fliptable flip guide plate sieve , it is very convenient to introduce different oversizes into different downstream equipment.

Description of drawings

Below in conjunction with accompanying drawing, specific embodiment of the present invention is described in further detail, wherein:

Fig. 1 is a schematic diagram of a single-layer banana sieve system according to an embodiment of the present invention for coal preparation with front stage deintermediation and rear stage classification;

Fig. 2 is according to the embodiment of the present invention shown in Fig. 1 and is carrying out the schematic diagram of application system of dehydration and classification of coarse clean coal;

Fig. 3 is the left side view of Fig. 2 (omitted single-layer banana sieve diagram).

Reference signs:

1. Single layer banana sieve;

11. Support seat; 12. Buffer spring; 13. Screen box; 131. Sieve plate section for separation; 132. Grading sieve plate section; 14. Drive exciter unit;

2. Under-sieve aggregate device;

21. Qualified medium funnel; 22. Thin medium funnel; 23. Under-screen chute; 231. Turning plate; 232. Turning plate control device;

3. Installation platform;

31. Install base one; 32. Install base two;

4. Fork chute;

41. Overturning guide plate; 42. Operating device for turning over guide plate;

5. Reprinted scraper machine;

6. Crusher;

7. Discharge chute;

8. Mixing barrel.

Detailed ways

The following describes the embodiments of the present invention in detail, and further illustrates the present invention. The embodiments described with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

Below in conjunction with Fig. 1 to Fig. 3, describe in detail the single-layer banana sieve system for coal preparation according to the embodiment of the present invention, the front stage deintermediation and the rear stage grading, and the single layer banana sieve system for coal preparation with front stage deintermediation and rear stage classification can also be used Dissolution and grading of minerals in other fields.

As shown in Figure 1, the single-layer banana sieve system for coal preparation proposed by the present invention includes a single-layer banana sieve 1 and an under-screen collecting device 2; the single-layer banana sieve 1 includes: a support seat 11. Buffer spring 12, screen box 13, driving vibrator unit 14, there are four support bases 11, and the support bases 11 are fixedly connected with the installation base; The installation bases are respectively recorded as installation base one 31 and installation base two 32, which are respectively connected to the support base 11 and support the support base 11; the buffer spring 12 is installed on the support base 11; the side plates of the screen box 13 are buffered Supported by spring 12; the side plate of sieve box 13 is supported by buffer spring 12; the front sieve plate section at the bottom of sieve box 13 is divided into de-intermediation sieve plate section 131, and de-intermediation sieve plate section 131 is equipped with de-intermediation sieve plate, which plays a role in coal Dehydration and mediation effect; the rear sieve plate section 132 is a grading sieve plate section, and the grading sieve plate section 132 can be optionally equipped with a dehydration sieve plate or a grading sieve plate, which can dehydrate and dehydrate or classify coal; drive The exciter unit 14 is connected to the screen box 13; the under-screen collection device 2 includes a qualified medium funnel 21, a dilute medium funnel 22, and an under-screen chute 23, and the qualified medium funnel 21 and the dilute medium funnel 22 are arranged on the de-medium sieve plate section 131 The dilute medium funnel 22 is set behind the qualified medium funnel 21; the under-screen chute 23 is set under the grading sieve plate section 132, and the front side of the upper section of the under-screen chute 23 is provided with a through opening connected to the rear end of the dilute medium funnel 22. Through, the upper part of the under-screen chute 23 is provided with a flap 231, and the flap 231 is rotatably connected to the side wall of the under-screen chute 23; The connection of the flap 231 can be turned backwards to stop the chute 23 under the screen.

With the technical solution of the present invention, if only the single-layer banana sieve 1 is required for dehydration and de-intermediation, the grading sieve plate section 132 of the single-layer banana sieve 1 is equipped with a de-intermediation sieve plate, and the flap 231 inside the under-screen chute 23 is turned backwards into place Cut off the under-screen chute 23, and connect the under-screen chute 23 with the dilute medium funnel 22, and the over-screen material obtained after dehydration and de-intermediation of the single-layer banana sieve 1 is the material after dehydration and de-intermediation. The following will be described in conjunction with the application examples, as shown in Figure 2, such as in the dense medium cyclone separation system, the coarse clean coal separated by the first stage of the dense medium main separation system enters the single-layer banana screen 1 for dehydration and deintermediation, and the coarse coal is obtained. Clean coal products can be used as thermal coal products. And the dilute medium under the grading sieve plate section 132 of the single-layer banana sieve 1 back section enters the under-screen chute 23 and enters the dilute medium funnel 22, and is transported to the washing system after merging with the dilute medium extracted from the front section of the single-layer banana sieve 1 The coarse selection medium barrel in the medium; the qualified medium under the sieve plate section 131 in the front section of the single-layer banana sieve 1 enters the qualified medium funnel 21 and is transported to the coarse selection qualified medium barrel in the washing system.

Adopt the technical scheme of the present invention, if both dehydration and de-intermediation of the single-layer banana sieve 1 and its classification are required, the grading sieve plate section 132 of the single-layer banana sieve 1 is equipped with a grading sieve plate, and the sieve gap of the grading sieve plate is larger than the de-intermediation sieve The sieve slit of the plate; the flap 231 inside the chute 23 under the screen is turned backwards to block the through opening, close the channel connected with the dilute medium funnel 22, and open the channel leading to the mixing bucket 8 in the washing system. In this way, the material with larger particle size obtained after the single-layer banana sieve 1 is dehydrated and classified is discharged from the single-layer banana sieve 1 sieve; And be transported to the qualified medium barrel in the washing system, and then recycle, the thin medium that comes out enters the thin medium funnel 22 and is transported to the thin medium barrel in the washing system, after further magnetic separation, the qualified medium obtained is recycled, The obtained tailings enter the slime water treatment system for further processing. Taking the main re-selection system of dense medium cyclone as an example, as shown in Figures 2 and 3, when washing low-ash coking coal blending, the coarse The clean coal passes through the single-layer banana sieve 1 for dehydration, deintermediation, and classification. The large-sized coarse clean coal on the single-layer banana sieve 1 enters the crusher 6 for crushing, and the crushed coarse and clean coal with small particle size passes through the crusher 6 times. The discharge chute 7 enters the mixing tank; the small-sized coarse clean coal under the grading sieve plate section 132 of the single-layer banana sieve 1 is exported into the mixing tank in the washing system through the under-screen chute 23. The small-sized coarse clean coal that enters the mixing tank enters the second-stage dense medium beneficiation system for beneficiation to obtain qualified low-ash clean coal that can be used as coking coal blending.

Further optionally, as shown in Figures 2 and 3, the single-layer banana screen system for coal preparation with front-stage deintermediation and rear-stage classification also includes a bifurcated chute 4, and the bifurcated chute 4 is located at the bottom of the single-layer banana screen 1. After sieving, the upper opening of the bifurcated chute 4 is connected with the upper discharge port of the single-layer banana sieve 1, and two outlets are arranged below the bifurcated chute 4, and the two outlets are connected with two downstream equipment ; The inside of the bifurcated chute 4 is provided with an overturning material guide plate 41 at the bifurcation, the overturning material guide plate 41 is rotatably connected with the side wall of the bifurcated chute 4, and the overturning material guide plate 41 blocks the material respectively at two limit positions. with access to both of the outlets. With this scheme, the material on the single-layer banana sieve 1 can be easily imported into two devices, such as installing a reloading scraper 5 and a crusher 6 behind the single-layer banana sieve 1, and the two discharges below the bifurcated chute 4 The port is connected with these two downstream equipments; when the material on the screen does not need to be crushed, the material on the single-layer banana screen 1 is introduced into the reloading scraper machine 5, and can be transported to the storage place; if the material on the screen needs to be crushed, change the classification The inside of the fork chute 4 reverses the direction of the guide plate 41, and the material on the screen is transferred to the crusher 6 for further crushing.

Specifically, according to the embodiment of the present invention, a turnover panel manipulation device 232 is provided outside the underscreen chute 23 , and the turnover panel manipulation device 232 is connected with the rotation shaft of the turnover panel 231 and drives the turnover panel 231 to turn over. A material guide plate manipulator 42 is arranged outside the bifurcation chute 4, and the material guide plate manipulator 42 is connected with the rotating shaft of the overturned material guide plate 41 and drives the turning over of the overturned material guide plate 41. In the embodiment shown in Fig. 1, the flap control device 232 is a hydraulic cylinder, and the material guide plate control device 42 is a hydraulic cylinder, which is driven by a hydraulic cylinder and requires a corresponding hydraulic pump station device. This is a conventional technology and is not described in this specification. Do a detailed introduction. In other embodiments, the turnover panel manipulation device 232 and the material guide plate manipulation device 42 are electro-hydraulic push rods, electric push rods, cylinders or manual push rod devices, which will not be described in detail here.

Specifically, the sieve box 13 of the single-layer banana sieve 1 is divided into five sections from the feeding end to the sieve plate at the discharge end, and the inclination angles of the five-section sieve plates become smaller successively; according to the embodiment of the present invention, the inclination difference between each section The inclination angle of the sieve plate from the feed end to the discharge end is 25°, 21°, 17°, 13°, 9°, 5°, decreasing step by step.

In the following, the working principle and application of the reverse side will be described in conjunction with the application cases of the embodiment of the present invention shown in Fig. 2 and Fig. 3 . Fig. 2 and Fig. 3 show the embodiment of the present invention shown in Fig. 1-in the main reselection system of the dense medium cyclone, the coarse clean coal deintermediation and dehydration classification equipment system, and the single-layer banana screen 1 is omitted in Fig. 3 .

The single-layer banana sieve 1 is installed on the elevated installation platform 3 in the washing workshop, the reloading scraper 5 is installed behind the single-layer banana sieve 1, and the crusher 6 is installed on the installation platform 3, which is in front of the single-layer banana sieve 1. Next to the reloading scraper machine 5; the discharge port of the crusher 6 is provided with a discharge chute 7, and the discharge chute 7 is connected to the mixing barrel 8 installed under the installation platform 3; the bifurcated chute 4 is located in the single After the sieve of the layer banana sieve 1, above the crusher 6 and the reloading scraper 5; below the bifurcated chute 4, there are two outlets, which are respectively connected to the inlet of the crusher 6 and the 5 ends of the reloading scraper. The top of the bifurcated chute 4 is connected with the upper outlet of the single-layer banana sieve 1; the inside of the bifurcated chute 4 is provided with a turning guide plate 41 at the bifurcation, and the turning guide plate 41 is connected to the bifurcation The side wall of the chute 4 can be rotatably connected, and the flip guide plate 41 blocks the passage of the material and the crusher 6, and the passage of the material and the reloading scraper 5 at two extreme positions; Below the grading sieve plate section 132 , the under-screen chute 23 communicates with the mixing bucket 8 . In this system, the first stage of heavy medium is the main selection and discharge, and the second stage is heavy medium selection. Figure 2 shows the deintermediation link after the first stage of dense medium cyclone sorting. The single-layer banana screen 1 in Figure 2 plays the role of demediation, dehydration and classification. effect. When the coal preparation production system only carries out steam coal washing, the single-layer banana screen 1 in Fig. 2 only plays the role of mediation and dehydration, and the grading screen section 132 in the single-layer banana screen 1 is installed with a mediation-removing screen, and the screen The turning plate 231 inside the lower chute 23 turns over and blocks the passage leading to the mixing bucket 8 in the washing system, and opens the communication with the dilute medium funnel 22 . The bifurcation chute 4 opens the passage with the transfer scraper 5 by turning over the material guide plate 41 . After the single-layer banana screen 1 dehydrates and removes the coarse clean coal separated by the dense medium cyclone, it is transferred by the reloading scraper machine 5 . When producing coking coal blending, the single-layer banana sieve 1 in Fig. 2 plays the role of mediation, dehydration and classification, and the grading sieve plate section 132 in the single-layer banana sieve 1 is installed with a grading sieve plate, and the sieve gap of the grading sieve plate is larger than The sieve slit of the de-intermediation sieve plate; the turning plate 231 inside the chute 23 under the sieve is turned over to stop the communication with the dilute medium funnel 22, and the passage leading to the mixing bucket 8 in the washing system is opened. The bifurcation chute 4 opens the passage with the crusher 6 by turning over the material guide plate 41 . The single-layer banana sieve 1 dehydrates and classifies the coarse clean coal separated by the dense medium cyclone. The coarse clean coal with large particle size enters the crusher 6 for crushing, and after crushing, it enters the mixing tank 8 from the discharge chute 7. The coarse and clean coal with small particle size is imported from the under-screen chute 23 into the mixing tank 8; the coarse and clean coal entering the mixing tank 8 enters the second-stage dense medium beneficiation system for beneficiation. In actual production, it is also necessary to add a water spray on the single-layer banana sieve 1. This technology is a known technology, and the present invention does not describe it in detail.

Adopting the technical scheme of the present invention can achieve the following beneficial effects: (1) the single-layer banana sieve system used for coal preparation in the front stage of deintermediation and rear stage grading only needs to use a single-layer banana sieve 1 to complete dehydration, deintermediation and classification , and can realize only two functions of dehydration, dehydration, and three functions of dehydration, dehydration and classification according to actual needs; (2) The scheme of under-screen aggregate device 2 is adopted, but the single-layer banana sieve 1 performs dehydration, dehydration and classification for different purposes When changing the direction of the turning plate 231 in the chute 23 under the screen, it is very convenient to realize the recovery of the material and medium under the screen; The technical solution is very convenient to introduce different oversizes into different downstream equipment.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (7)

1. a kind of single-layer banana sieve system of front stage deintermediation and rear stage classification for coal preparation is characterized in that, The single-layer banana sieve system for the coal preparation includes a single-layer banana sieve and an under-screen collecting device, and the single-layer banana sieve includes: There are four supporting seats, and the supporting seats are fixedly connected with the installation base; a buffer spring, the buffer spring is installed on the support seat; A screen box, the side plate of the screen box is supported by the buffer spring; the front sieve plate section at the bottom of the screen box is divided into a de-medium sieve plate section, and the de-medium sieve plate section is equipped with a de-medium sieve plate, and the coal It plays the role of dehydration and mediation; the rear sieve plate section is a grading sieve plate section, and the grading sieve plate section can be optionally equipped with a dehydration sieve plate or a grading sieve plate to dehydrate and de-intermediate coal or dehydrate and de-intermediate grading ; drive a vibrator unit, the drive vibrator unit is connected to the screen box; The under-screen collecting device includes a qualified medium funnel, a thin medium funnel, and an under-screen chute. The qualified medium funnel and the thin medium funnel are arranged below the de-medium sieve plate section, and the thin medium funnel is arranged at The rear of the qualified medium funnel; the under-sieve chute is set under the grading sieve plate section, and the front side of the upper section of the under-sieve chute is provided with a through hole to communicate with the rear end of the thin medium funnel. There is a flap inside the upper section of the under-screen chute, and the flap is rotatably connected to the side wall of the under-screen chute; the flap can be turned forward to block the through opening and block the connection with the thin medium funnel. The connection, the flap can be turned backwards to stop the underscreen chute. 2. the single-layer banana sieve system of front stage deintermediation and rear stage classification for coal preparation according to claim 1, is characterized in that, also comprises bifurcation chute, and described bifurcation chute is located at the described single-layer banana sieve After sieving, the upper mouth of the bifurcated chute is connected with the discharge opening on the screen of the single-layer banana sieve, and two outlets are arranged below the bifurcated chute, and the two outlets are connected to the two outlets. The downstream equipment is connected; the inside of the bifurcated chute is provided with a turning guide plate at the bifurcation, and the turning guide plate is rotatably connected with the side wall of the bifurcating chute, and the turning guide plate is connected between two The extreme positions respectively block the passages of the material and the two outlets. 3. The single-layer banana sieve system for coal preparation according to claim 1, characterized in that, a flap manipulation device is provided outside the chute under the screen, and the flap manipulation device It is connected with the rotating shaft of the turning plate and drives the turning of the turning plate. 4. coal preparation according to claim 2 is characterized in that the single-layer banana sieve system with front stage deintermediation and rear stage classification is provided with a material guide plate manipulation device outside the bifurcated chute, and the material guide plate The manipulating device is connected with the rotation shaft of the turning guide plate and drives the turning of the turning guide plate. 5. The single-layer banana sieve system for coal preparation according to claim 3, characterized in that, the flap control device is a hydraulic cylinder or an electro-hydraulic push rod or an electric push rod or a cylinder Or manually operate the push rod device. 6. The single-layer banana sieve system for coal preparation according to claim 4, characterized in that, the manipulating device of the guide plate is a hydraulic cylinder or an electro-hydraulic push rod or an electric push rod or Cylinder or manual push rod device. 7. coal preparation according to claim 1 is characterized in that, the sieve plate of described sieve box is divided into five sections from the feed end to the discharge end with front section deintermediation and rear section classification, and five sections The inclination angle of the sieve plate in the section becomes smaller in turn, and the angle difference is 4°; the inclination angle of the sieve plate from the feed end to the discharge end is 25° angle, 21° angle, 17° angle, 13° angle, 9° angle, 5° angle, ° angle, decreasing step by step.

Images