Vibrating screen for granular fertilizer raw materials

Abstract

The utility model discloses a vibrating screen for granular fertilizer raw materials. The upper and lower filter screen devices are respectively positioned and mounted on the upper and lower filter screen supporting frames; upper and lower material spitting grooves which are respectively inclined towards two sides are fixed at the rear end and are used for collecting sundries and large-particle materials; the upper and lower filter screen support frames are rotationally connected with the fixed screen body through a side rotating mechanism; the filter screen is fixed by the filter screen fixing mechanism, the filter screen fixing mechanism adopts a pressure spring pull rod type or bolt and nut structure, the operation is simple, and the inner end of a pull rod or a bolt is arc-shaped. Or the lower filter screen supporting frame and the fixed screen body are combined into a whole, the left rotating mechanism is removed, and the lower filter screen is taken out to be cleaned or not used. Impurities and large-particle raw material fertilizer can be simultaneously screened out, the filter screen is fast to replace, the filter screen is convenient to overturn and clean, and the vibrating screen is very suitable for the condition that the surrounding space of the vibrating screen is limited.

Description

Technical Field

[0001] The utility model is applied to the field of granular fertilizer production, and relates to the screening after raw material crushing. Specifically, it is a double-layer vibrating screen that is convenient for disassembly and cleaning. Background Technique

[0002] In the production of granular organic water-soluble fertilizer, after the mixing, crushing, stirring, screening, and extrusion of raw material fertilizers such as nitrogen, phosphorus, and potassium into granules. During the screening process, it is necessary to separate the sundries in the raw material fertilizer, as well as the large-particle raw material fertilizer and the fine-particle raw material fertilizer. Sundries such as small wooden sticks and plastic sheets are useless wastes and need to be separated from the water-soluble fertilizer. For the large-particle raw material fertilizer, after screening, it is returned to the crusher for continuous crushing and utilization. The small-particle raw material fertilizer enters the next extrusion molding process to be extruded into granular organic fertilizer. Usually, it is divided into two-stage screening, and two vibrating screens or drum screens are required, which occupy a large area, and the filter holes of the filter screen are not easy to clean, it is troublesome to replace the filter screen, and the downtime reaches half a day.

[0003] There are many patent applications for vibrating screens with two layers of filter screens installed. For example, a combined multi-layer vibrating screen disclosed in CN208437213U has a feed inlet at the upper part of the front end, a discharge outlet for large-particle materials at the rear end, and a discharge outlet for small-particle materials at the bottom. There are three layers of sieve meshes in the box body, and a sieve mesh support is arranged on the side for installing a new sieve mesh layer, and the four outlets are all shunted from the rear end. The new sieve mesh layer can be slid in or out through rollers, but the installation and disassembly methods of the other three layers of sieve meshes are not mentioned. The vibrating screen separator with detachable sieve mesh disclosed in CN203329969U has two layers of filter screens, and all three discharge outlets are arranged at the rear end. When cleaning the mesh holes of the sieve mesh, it is necessary to remove the front cover plate and the sealing strip, loosen the locking bolts, and pull out the sieve mesh frame to clean the sieve mesh. A linear vibrating screen convenient for replacing the sieve mesh disclosed in CN210253085U has more than three discharge outlets at the lower part of the front end of the sieve box, a feed hopper is installed at the upper part of the rear end of the sieve box, and there are more than two layers of horizontal slots on the inner walls on both sides of the sieve box. The horizontal slots and the metal frame of the sieve mesh are provided with locking bolts for locking and fixing the sieve mesh. The rear end of the sieve box is connected with a sealing plate through a hinge, and the sealing plate is provided with a locking device. When the locking device is opened, the sieve mesh can be inserted or pulled out. It can be seen that the above-mentioned vibrating screens all adopt the method of pulling out the filter screen for cleaning or replacement. This method not only wastes time in operation, but also requires space for the filter screen to be pulled out, which is not applicable to vibrating screens arranged in pits or on high platforms. Content of the Utility Model

[0004] The technical problem solved by the utility model is: to provide a vibrating screen for granular fertilizer raw materials, with two upper and lower filter screens, simultaneously screening sundries and large-particle raw material fertilizers. Adopting a simple filter screen fixing mechanism and a rotating mechanism, the filter screen is simply fixed and can be flipped, which provides convenience for the cleaning and replacement of the filter screen.

[0005] The technical solution adopted by the utility model is as follows: The vibrating screen for granular fertilizer raw materials includes a screen body, and the screen body includes an upper filter screen support frame, a filter screen fixing mechanism, a rotating mechanism, a fixed screen body, a lower filter screen support frame, and a filter screen device. The upper filter screen support frame includes a right upper plate, an upper frame, and an upper discharge chute which are fixedly connected, and the upper discharge chute is used for collecting sundries. The filter screen fixing mechanism and the rotating mechanism are installed on both sides of the screen body. The fixed screen body includes a right lower plate, a bottom plate, and a left lower plate which are fixedly connected, and the bottom plate is used for conveying the screened small-particle raw material fertilizer. The lower filter screen support frame includes a left upper plate, a lower frame, and a lower discharge chute which are fixedly connected, and the lower discharge chute is used for collecting large-particle raw material fertilizer. The filter screen device includes fasteners, a pressing frame, a filter screen, and a positioning frame. The filter screen is fixed between the upper pressing frame and the lower positioning frame through the fasteners for screening. The filter screen device is divided into upper and lower layers. The upper-layer filter screen device screens sundries, and its positioning frame is positioned and installed in cooperation with the upper frame. The lower-layer filter screen device screens large-particle raw material fertilizer, and its positioning frame is positioned and installed in cooperation with the lower frame. The filter screen fixing mechanism respectively fixes the positioning frames of the upper and lower layer filter screen devices. The right upper plate and the right lower plate are rotationally connected through the rotating mechanism, and the left upper plate and the left lower plate are rotationally connected through the rotating mechanism. The upper discharge chute and the lower discharge chute are located at the outlet end of the vibrating screen body. The upper discharge chute is inclined towards the rotating mechanism connected to the right upper plate, and the lower discharge chute is inclined towards the rotating mechanism connected to the left upper plate. In this way, sundries, large-particle raw material fertilizer, and small-particle raw material fertilizer are respectively diverted from the right side, left side, and rear side of the vibrating screen.

[0006] Further, the filter screen fixing mechanism is a compression spring pull rod type. Under the action of the compression spring, the pull rod extends towards the positioning frame; or the filter screen fixing mechanism is a bolt and nut structure, the nut is welded on the outer side of the screen body, a backup nut is installed on the bolt, and the bolt is fixed with the backup nut. The inner end of the pull rod or the bolt is designed to be arc-shaped or spherical.

[0007] Further, the rotating mechanism includes a steel plate and a rotating shaft. The steel plates are respectively welded and fixed at the outer bottoms of the left upper plate and the right upper plate, and are rotationally connected to the rotating shaft through a support plate. The rotating shaft is respectively fixed at the outer upper parts of the left lower plate and the right lower plate through a fixing plate.

[0008] Further, a handle is welded on the pressing frame or the positioning frame to facilitate the taking and placing of the filter screen.

[0009] Further, the lower filter screen support frame and the fixed screen body are integrated into one body, and the rotating mechanism connecting the left upper plate and the left lower plate is removed. The upper filter screen support frame can be flipped, the lower filter screen is taken out for cleaning or the lower filter screen is not used, that is, the lower-layer filter screen device and its filter screen fixing mechanism are removed.

[0010] Further, the vibrating screen is matched with a movable or rotatable feed chute. Before cleaning the filter screen, the feed chute needs to be moved away.

[0011] The beneficial effects of the present utility model are as follows: The upper and lower two-layer filter screens of the present utility model can simultaneously screen out sundries and large-particle raw material fertilizers, saving equipment investment and floor area. The filter screen fixing mechanism has a simple structure, and the operation of fixing or replacing the filter screen device is fast, with a short downtime. By adopting the method of flipping the filter screen support frame, the operation of cleaning the filter screen is simplified, which is very suitable for the situation where the space around the vibrating screen is limited. Description of the Drawings

[0012] Figure 1 is the front view schematic diagram of Embodiment 1 and also Figure 2 the A-A sectional view schematic diagram of

[0013] Figure 2 is Figure 1 the top view schematic diagram of

[0014] Figure 3 is Figure 1 the partial enlarged view of

[0015] Figure 4 is Figure 1 the right view schematic diagram of

[0016] Figure 5 is Figure 1 the left view schematic diagram of

[0017] Figure 6 is the B-direction schematic diagram of Earth 4;

[0018] Figure 7 is the schematic diagram of removing the filter screen in Embodiment 1;

[0019] Figure 8 is the schematic diagram of the filter screen fixing mechanism in Embodiment 2;

[0020] Figure 9 is the schematic diagram of removing the filter screen in Embodiment 3;

[0021] Figure 10 is the schematic diagram of installing a three-layer filter screen structure;

[0022] In the figure: 1 - upper filter screen support frame, 11 - upper right plate, 12 - upper frame, 13 - upper discharge chute;

[0023] 2 - filter screen fixing mechanism, 21 - pull rod, 22 - compression spring, 23 - cylinder body, 24 - bolt, 25 - backup nut, 26 - nut;

[0024] 3 - rotating mechanism, 31 - steel plate, 32 - rotating shaft;

[0025] 4 - fixed sieve body, 41 - lower right plate, 42 - bottom plate, 43 - front plate, 44 - lower left plate;

[0026] 5 - Lower filter support frame, 51 - Upper left plate, 52 - Lower frame, 53 - Lower discharge chute;

[0027] 6 - Filter device, 61 - Fastener, 62 - Pressing frame, 63 - Filter screen, 64 - Positioning frame. Detailed implementation mode

[0028] The present utility model focuses on describing the screen body structure of the vibrating screen. Other structures not described, such as vibration motors, fixed support legs, vibration support springs, reinforcing ribs and other reinforcing structures, all belong to the prior art. The following "front and back" is determined according to the conveying direction of the raw materials. The front plate 43 in the attached drawings is the front, and its relative end discharge chute is the back. The vibrating screen is usually inclined from front to back. Attached Figure 1 and Attached Figure 6 and Attached Figure 7 For simplifying the lines of the attached drawings, the screen body is placed horizontally for drawing. The following "left and right" is determined according to the left and right of Attached Figure 1 and Attached Figure 2 . Embodiment 1

[0029] The screen body of the vibrating screen in this embodiment is as shown in Attached Figure 1-7 , and includes an upper filter support frame 1, a filter screen fixing mechanism 2, a rotating mechanism 3, a fixed screen body 4, a lower filter support frame 5 and a filter device 6. The filter device 6 is divided into upper and lower layers. The upper - layer filter device is mainly used for filtering foreign matters in the raw materials, and the lower - layer filter device is mainly used for filtering large - particle raw materials after crushing. The filter device 6 includes fasteners 61, pressing frames 62, filter screens 63 and positioning frames 64, etc., as shown in Attached Figure 2 and Attached Figure 3 . The filter screen 63 is installed between the upper pressing frame 62 and the lower positioning frame 64 and fixed with fasteners 61. To facilitate the taking and placing of the filter device, a handle (not shown in the attached drawings) is welded on the pressing frame 62 or the positioning frame 64. The positioning frame 64 is used to realize the positioning installation of the filter device. In addition to the function of fixing the filter screen, the pressing frame 62 can also prevent the raw materials from moving laterally during vibration, restricting the raw materials to flow backward only within the range of the filter screen.

[0030] The filter screen fixing mechanism 2 is used to fix the filter device 6. The filter screen fixing mechanism can have various structures. In this embodiment, a relatively convenient compression spring pull - rod type is given, as shown in Attached Figure 3As shown in the figure, it includes a pull rod 21, a compression spring 22, and a cylinder 23. The cylinder 23 is fixed to the outside of the side plate of the sieve body and is detachable (fixed by welding symbols in the attached drawing). The compression spring 22 and the pull rod 21 are installed inside the cylinder. One end of the compression spring acts on the inner end of the cylinder, and the other end acts on the convex ring of the pull rod. Under the action of the compression spring, the pull rod extends towards the filter device. The inner end of the pull rod is used to fix or limit the positioning frame 64 of the filter device. A handle is designed at the outer end of the pull rod for easy external pulling operation. When the pull rod is pulled outwards, the convex ring of the pull rod compresses the compression spring, and the inner end of the pull rod moves outwards. The positioning frame loses its restraint, and the filter device can be taken out.

[0031] The fixed sieve body 4 includes a lower right plate 41, a bottom plate 42, a front plate 43, a lower left plate 44, etc. that are fixedly connected as a whole. A vibration motor is installed at the bottom of the bottom plate 42 and is connected to the fixed support leg through a vibration support spring. The lower right plate 41 is rotatably connected to the upper filter support frame 1 through a rotating mechanism 3. The upper filter support frame 1 includes an upper right plate 11, an upper frame 12, and an upper discharge chute 13, which are fixedly connected as a whole. The upper frame 12 cooperates with the positioning frame 64 of the upper layer filter device for positioning and placing the upper layer filter device. The upper discharge chute 13 is located at the outlet end of the vibrating sieve body and is inclined to the right, that is, to one side of its rotating shaft, as shown in the attached Figure 6 figure, and is used to collect sundries that cannot pass through the upper layer filter. Under the action of vibration, they fall from the right mouth. The rotating mechanism 3 includes a steel plate 31 and a rotating shaft 32. The steel plate 31 is welded and fixed to the outside of the upper right plate 11 and is rotatably connected to the rotating shaft 32 through a support plate. The rotating shaft 32 is fixed to the outside of the lower right plate 41 through a fixing plate. In this way, the upper filter support frame 1 can rotate around the rotating shaft 32.

[0032] The left side structure is similar to the right side. The lower left plate 44 is rotatably connected to the lower filter support frame 5 through a rotating mechanism 3. The lower filter support frame 5 includes an upper left plate 51, a lower frame 52, and a lower discharge chute 53 that are fixedly connected as a whole. The lower frame 52 cooperates with the positioning frame of the lower layer filter device for positioning and placing the lower layer filter device. The lower discharge chute 53 is located below the upper discharge chute 13 and is inclined to the left, that is, to one side of its rotating shaft, and is used to collect large particle raw materials that cannot pass through the lower layer filter. Under the action of vibration, they fall from the left mouth. The steel plate 31 of the rotating mechanism is welded and fixed to the outside of the upper left plate 51 and is rotatably connected to the rotating shaft 32 through a support plate. The rotating shaft 32 is fixed to the outside of the lower left plate 44 through a fixing plate. In this way, the lower filter support frame 5 can rotate around the rotating shaft 32.

[0033] The filter fixing mechanism 2 of the upper layer filter device is symmetrically arranged in the middle of the upper left plate 51 and the lower part of the upper right plate 11. The filter fixing mechanism 2 of the lower layer filter device is symmetrically arranged in the lower part of the upper left plate 51 and the middle of the lower right plate 41, as shown in the attached Figure 1 drawing, Figure 4 drawing, Figure 5 drawing.

[0034] When this embodiment is in use, the crushed granular fertilizer raw materials fall into the vibrating screen from the front end. The vibrating screen vibrates, and the crushed materials leak through the upper filter screen. The sundries larger than the aperture of the filter screen gradually enter the upper discharge chute along with the vibration of the upper filter screen, and fall and are collected from the right side opening along with the vibration. On the lower filter screen, the large granular raw materials larger than the aperture of the filter screen gradually enter the lower discharge chute along with the vibration of the lower filter screen, and fall and are collected from the left side opening along with the vibration, and then return to the crusher for further crushing. The fine materials that meet the size requirements leak through the lower filter screen, and along with the vibration of the bottom plate 42, they fall from the blanking end onto the belt conveyor and are transported to the next-station mixing and stirring machine. The sundries, large granular raw materials, and fine materials are respectively shunted from the right side, left side, and rear end.

[0035] As the vibrating screening progresses, the filter holes of the filter screen will be blocked by irregular granular materials. When the filter screen needs to be cleaned, as shown in the appendix Figure 7 First, pull out the pull rod on the upper left plate externally to release the limit on this side of the upper filter screen support frame. Rotate the upper filter screen support frame clockwise as shown in the figure to flip the upper filter screen. The sundries in the upper discharge chute can be poured out from the outlet. Gently tap the upper filter screen to vibrate, so that the sundries stuck in the filter holes fall, and clean the upper filter screen. Then, perform similar operations. Pull out the pull rod on the lower right plate externally to release the limit on this side of the lower filter screen support frame. Rotate the lower filter screen support frame counterclockwise as shown in the figure to flip the lower filter screen. The large granular raw materials in the lower discharge chute can be poured out from the outlet. Gently tap the lower filter screen to vibrate, so that the large granular raw materials stuck in the filter holes fall, and clean the lower filter screen. After cleaning, first rotate and reset the lower filter screen support frame, and then rotate and reset the upper filter screen support frame, and the filter screen cleaning is completed. When the filter holes of the filter screen are broken and enlarged and the filter screen needs to be replaced, after flipping the upper and lower filter screen support frames according to the above operations, pull out the pull rod on the other side and take out the filter screen support frame for replacement. Embodiment 2

[0036] This embodiment is an improvement on the filter screen fixing mechanism 2 in Embodiment 1, and the filter screen fixing mechanism 2 is changed to a bolt and nut structure, as shown in the appendix Figure 8 The nut 26 is welded on the outside of the sieve body plate, the bolt 24 is threadedly connected with the nut 26, and a locknut 25 is pre-installed on the bolt 24. After the bolt is screwed to limit the positioning frame 64, tighten the locknut to prevent the bolt from vibrating and loosening.

[0037] The filter screen fixing mechanism of this embodiment is convenient to manufacture and has a low cost, but the operation is slightly more troublesome, and it is necessary to screw the locknut and bolt step by step. The cleaning or replacement operation of the filter screen in this embodiment is the same as above. Embodiment 3

[0038] This embodiment is a combination of the above embodiments. As shown in the appendix Figure 9 The lower filter screen support frame 5 and the fixed sieve body 4 are combined and become a part of the fixed sieve body 4, omitting the rotating mechanism 3 on the left side. The right filter screen fixing mechanism 2 is a bolt and nut structure, and the left filter screen fixing mechanism 2 is a compression spring pull rod type.

[0039] When the filter screen needs to be cleaned or replaced, first screw out the bolt 24, then pull out the upper left pull rod 21 outward, loosen and rotate the upper filter screen support frame clockwise, then pull out the lower left pull rod 21 outward, loosen the lower filter screen support frame, hold the handle on the lower filter screen support frame, and take out the lower filter screen support frame. After cleaning or replacement, perform reverse operations for reset.

[0040] This embodiment is applicable to the occasions where the left - hand side flipping is restricted.

[0041] It should be noted that: 1) In this utility model, the structure of the vibrating screen is described by taking the upper and lower two - layer filter screens as an example. When there is only one - layer filter screen, the structure of Embodiment 3 can be adopted, and the lower filter screen support frame and its filter screen fixing mechanism in the above - mentioned embodiment can be removed. When three - layer filter screens are adopted, based on the structure of Embodiment 1, for the lowermost layer filter screen, the method of taking it out from the sieve body in Embodiment 3 is adopted, as shown in the appendix Figure 10 shown. 2) Whether it is the inner end of the pull rod or the inner end of the bolt, it is advisable to be designed as an arc - shaped or spherical shape. Even if the positioning frame is deformed and slightly protrudes above the upper frame or the lower frame, the arc - shaped end plays a guiding role, and the pull rod or the bolt can still move inward and fix and limit the positioning frame.

[0042] This utility model is preferably matched with a movable or rotatable feed chute. Since the feed chute of the vibrating screen is located above the vibrating screen, it is necessary to move or rotate the feed chute before flipping the filter screen device.

[0043] This utility model adopts an upper and lower two - layer filter screen device, which can simultaneously screen out sundries and large - particle raw material fertilizers, shunt from three directions, save equipment investment and floor area, and reduce equipment energy consumption. It can also be applied to single - layer or three - layer filter screens. The filter screen fixing mechanism has a simple structure, and the operation of fixing or replacing the filter screen device is convenient, and the downtime does not exceed half an hour. This utility model adopts the structure of flipping the filter screen support frame, which not only simplifies the filter screen cleaning operation, but also greatly saves the surrounding space of the vibrating screen. Without using the extraction method, it is very suitable for the situation where the space around the vibrating screen is limited, such as the vibrating screen installed in a pit or on a high platform.

Claims

1. A vibrating screen for granular fertilizer raw materials, comprising a screen body, characterized in that: The sieve body includes an upper filter support frame (1), a filter fixing mechanism (2), a rotating mechanism (3), a fixed sieve body (4), a lower filter support frame (5) and a filter device; The upper filter support frame (1) includes a right upper plate (11), an upper frame (12) and an upper discharge chute (13) which are fixedly connected; The filter fixing mechanism (2) and the rotating mechanism (3) are installed on both sides of the sieve body; The fixed sieve body (4) includes a right lower plate (41), a bottom plate (42) and a left lower plate (44) which are fixedly connected; The lower filter support frame (5) includes a left upper plate (51), a lower frame (52) and a lower discharge chute (53) which are fixedly connected; The filter device includes fasteners, a pressing frame (62), a filter and a positioning frame (64); the filter is fixed between the upper pressing frame (62) and the lower positioning frame (64) through the fasteners; The filter device is divided into upper and lower layers. The positioning frame (64) of the upper layer of the filter device is positioned and installed in cooperation with the upper frame (12), and the positioning frame (64) of the lower layer of the filter device is positioned and installed in cooperation with the lower frame (52); the filter fixing mechanism (2) fixes the positioning frames (64) of the upper and lower layers of the filter device respectively; The right upper plate (11) and the right lower plate (41) are rotationally connected through the rotating mechanism (3), and the left upper plate (51) and the left lower plate (44) are rotationally connected through the rotating mechanism (3); The upper discharge chute (13) and the lower discharge chute (53) are located at the outlet end of the vibrating sieve body. The upper discharge chute (13) is inclined towards the rotating mechanism (3) connected to the right upper plate (11), and the lower discharge chute (53) is inclined towards the rotating mechanism (3) connected to the left upper plate (51).

2. The vibrating screen for granular fertilizer raw materials according to claim 1, characterized in that: The filter fixing mechanism (2) is of a compression spring pull rod type. Under the action of the compression spring, the pull rod extends towards the positioning frame (64); the inner end of the pull rod is designed to be arc-shaped or spherical.

3. A vibrating screen for granular fertilizer raw materials according to claim 1, characterized in that: The filter fixing mechanism (2) is of a bolt and nut structure. The nut is welded on the outer side of the sieve body, and a backup nut is installed on the bolt; the inner end of the bolt is designed to be arc-shaped or spherical.

4. A vibrating screen for granular fertilizer raw materials according to claim 1, characterized in that: The rotating mechanism includes a steel plate (31) and a rotating shaft (32). The steel plate (31) is respectively welded and fixed at the outer bottom of the left upper plate (51) and the right upper plate (11), and is rotationally connected to the rotating shaft (32) through a support plate. The rotating shaft (32) is respectively fixed at the outer upper part of the left lower plate (44) and the right lower plate (41) through a fixing plate.

5. A vibrating screen for granular fertilizer raw materials according to claim 1, characterized in that: A handle is welded on the pressing frame (62) or the positioning frame (64).

6. A vibrating screen for granular fertilizer raw materials according to claim 1, characterized in that: The lower filter support frame (5) and the fixed sieve body (4) are combined into one body, and the rotating mechanism (3) connecting the left upper plate (51) and the left lower plate (44) is removed.

7. The vibrating screen for granular fertilizer raw materials according to claim 6, characterized in that: The lower layer of the filter device and its filter fixing mechanism (2) are removed.

8. A vibrating screen for granular fertilizer raw materials according to claim 1, characterized in that: The vibrating sieve is matched with a movable or rotatable feed chute.

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