CN212442050U

CN212442050U - Composite screen

Info

Publication number: CN212442050U
Application number: CN202021176929.7U
Authority: CN
Inventors: 吴国宪; 陈欢; 吴苏川
Original assignee: Changzhou Guodai Coal Preparation Science & Technology Co ltd
Current assignee: Changzhou Guodai Coal Preparation Science & Technology Co ltd
Priority date: 2020-06-23
Filing date: 2020-06-23
Publication date: 2021-02-02
Anticipated expiration: 2030-06-23

Abstract

The utility model discloses a composite sieve, which comprises a circular sieve sheet, a ratchet wheel, a driving shaft and a spring sieve plate, wherein the circular sieve sheet and the ratchet wheel are alternately connected in series on the driving shaft, the spring sieve plate and the circular sieve sheet are arranged in a crossed way to form a composite sieve surface, materials enter a sieving chamber, the materials smaller than a first-level sieve seam fall onto the spring sieve plate, and the materials larger than the first-level sieve seam flow to a discharge port to realize primary sieving; the materials smaller than the second-stage screen seams on the spring screen plate fall below the composite screen surface, the materials larger than the second-stage screen seams flow to the discharge port along the inclined screen surface formed by the spring screen plate, and the composite screen surface periodically vibrates along with the rotation of the ratchet wheel, so that the materials obtain additional kinetic energy vertical to the screen surface. In this way, the utility model discloses compound sieve can make the loose kinetic energy of material obtain improving, makes wet glutinous material also can be fine loose, improves fine material and sieves kinetic energy thoroughly, improves screening efficiency, has better screening effect to coal, ore and tiny wet glutinous material.

Description

Composite screen

Technical Field

The utility model relates to a colliery screening technical field especially relates to a composite sieve.

Background

Along with the increasing production level of coal mines, the importance of coal size classification in a coal production system is increasingly highlighted, and efficient screening equipment which meets the production requirement is designed and manufactured to improve the classification level and efficiency of coal, so that the problem to be solved in the development of fine-grained classification technology is solved.

The dry screening is carried out on materials such as coal, ore and the like, and is mainly used for grading the materials with the granularity smaller than 6mm, and in the prior art, a powerful vibration screening technology or a crossed roller screening technology is mainly adopted.

The defects of the powerful vibration screening technology are as follows: the vibration load is large, and the noise is large;

the disadvantages of the cross roller screening technology are: the screen surface structure of the crossed roller screen is composed of a circular screen sheet which is strung on a shaft to form a circular top surface and a trapezoidal screen cavity which is formed by the crossed arrangement of an upper screen sheet and a lower screen sheet, materials smaller than the width of the screen cavity fall into the screen cavity, and materials smaller than screen seams fall under the screen to achieve the purpose of screening; the materials which are smaller than the width of the sieve cavity and larger than the width of the sieve slot are taken out of the sieve cavity in the sieve cavity and conveyed towards the discharge port by the friction force of the sieve sheet.

Because the sieve chamber is a trapezoidal cross section, be equivalent to the blanking hole, the remaining material relies on the frictional force of sieve piece completely to take it out, therefore the efficiency of material from the ejection of compact of sieve chamber is very low, and old material can not in time be discharged, and new material just can not enter the sieve chamber, just can not carry out effective screening yet, especially when the material granularity constitutes thinly, screening efficiency obviously descends.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the main technical problem who solves provides a composite sieve, can make the loose kinetic energy of material obtain improving, makes the loose that wet sticky material also can be fine, has improved the sieve kinetic energy that passes through of fine material, has improved screening efficiency, has better screening effect to the tiny wet sticky material of coal, ore and similar nature.

In order to solve the technical problem, the utility model discloses a technical scheme be: provides a composite sieve which is positioned in a sieving chamber, one side of the sieving chamber is provided with a feeding hole, the other side is provided with a discharging hole,

be equipped with the composite screen that is the slope setting in the screening chamber, the composite screen includes: the screen comprises circular screen sheets, ratchet wheels, a driving shaft and a spring screen plate, wherein the circular screen sheets and the ratchet wheels are alternately connected in series on the driving shaft, and the spring screen plate and the circular screen sheets are arranged in a crossed manner to form a composite screen surface.

In a preferred embodiment of the present invention, the circular sieve plate and the ratchet wheel are driven by the driving shaft to perform a circular motion along the rotation direction of the driving shaft.

In a preferred embodiment of the present invention, the spring sieve plate includes spring rods on both sides and an intermediate connecting member for fixedly connecting the spring rods on both sides.

In a preferred embodiment of the present invention, the ratchet wheel is composed of one-way arc-shaped teeth, a web, a shaft hole and a key groove, the ratchet wheel is mounted on the driving shaft through the shaft hole and the key groove, and the ratchet wheel performs one-way intermittent motion toward the inclined direction of the one-way arc-shaped teeth when rotating.

In a preferred embodiment of the present invention, the spring rods of the spring sieve plate are inserted between the circular sieve plates, the spring sieve plate is disposed in an inclined manner, and the ends of the spring rods on both sides of the spring sieve plate are tangent to the middle gear of the ratchet wheel to form a cross arrangement.

In a preferred embodiment of the present invention, the first-level screen slits with the same width are formed between the adjacent circular screen pieces on the driving shaft, so as to realize the primary screening of the material.

In a preferred embodiment of the present invention, the spring rods on the composite screen surface and the circular screen pieces on both sides form equal-width secondary screen slots, and the size of the secondary screen slots is matched according to the screening granularity.

In a preferred embodiment of the present invention, the ratchet rotates along with the driving shaft, and the gradually changing arc tooth surface of the one-way arc tooth lifts up the spring rod to drive the whole spring sieve plate to move in a reciprocating up-and-down motion along with the arc tooth surface.

In a preferred embodiment of the present invention, the material and the composite screening surface move relative to each other, and the material moves in a direction perpendicular to the composite screening surface.

The utility model has the advantages that: the utility model discloses compound sieve has better screening effect to coal, the tiny wet sticky material of ore and similar nature, and noise pollution is little, compact structure, can solve the easy jam of the tiny granularity classification in-process sifter of dry material, screening efficiency is low, the dynamic load is big, big scheduling problem of noise, the loose kinetic energy that makes the material obtains improving, it is also fine loose that the wet sticky material also can be fine to make, the kinetic energy of sieving thoroughly of thin material has also been improved simultaneously, the fine granule material that makes to fall on the spring sieve seam sieves thoroughly and sieves more reservely, screening efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:

FIG. 1 is a front view of a preferred embodiment of the composite screen of the present invention;

FIG. 2 is a left side view of a preferred embodiment of the composite screen of the present invention;

fig. 3 is a schematic structural view of a preferred embodiment of a spring screen deck in the composite screen of the present invention;

FIG. 4 is a schematic structural view of a preferred embodiment of a ratchet in the composite screen of the present invention;

FIG. 5 is a view from the direction A of FIG. 1;

FIG. 6 is a partial enlarged view of B in FIG. 5;

the parts in the drawings are numbered as follows: 1. motor, 2, drive shaft, 3, circular sieve piece, 4, spring sieve board, 401, spring rod, 402, intermediate junction spare, 5, ratchet, 501, cambered surface teeth of a cogwheel, 502, wheel flank, 503, shaft hole, 504, keyway, 505, tooth pitch circle, 6, primary sieve seam, 7, second grade sieve seam, 8, pan feeding mouth, 9, discharge gate, 10, screening chamber.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1 to 6, an embodiment of the present invention includes:

a composite sieve is positioned in a sieving chamber 10, a feeding port 8 is arranged on one side of the sieving chamber 10, a discharging port 9 is arranged on the other side of the sieving chamber 10, and the composite sieve which is obliquely arranged is arranged in the sieving chamber 10.

The utility model discloses in, compound sieve includes circular sieve piece 3, ratchet 5, drive shaft 2 and spring sieve 4, and circular sieve piece 3 and ratchet 5 establish ties in turn on drive shaft 2, and motor 1 drives the operation of drive shaft 2, and circular sieve piece 3 and ratchet 5 carry out circular motion along the direction of rotation of drive shaft 2 under the drive of drive shaft 2.

The spring sieve plate 4 comprises spring rods 401 at two sides and a middle connecting piece 402 fixedly connecting the spring rods 401 at two sides, and the spring sieve plate 4 is integrally shaped like a double-sided comb.

The ratchet wheel 5 is composed of a one-way cambered surface gear 501, a gear flank 502, a shaft hole 503 and a key groove 504, the ratchet wheel 5 is installed on the driving shaft 2 through the shaft hole 503 and the key groove 504, and when the ratchet wheel 5 rotates, the ratchet wheel performs one-way intermittent motion towards the inclination direction of the one-way cambered surface gear 501.

The spring sieve plate 4 and the circular sieve sheets 3 are arranged in a crossed mode to form a composite sieve surface, the spring rods 401 of the spring sieve plate 4 are inserted between the circular sieve sheets 3 in the crossed mode, and the end portions of the spring rods 401 on the two sides of the spring sieve plate 4 are tangent to a tooth center circle 505 of the ratchet wheel 5.

The utility model discloses in, form one-level screen cut 6 of aequilate between the adjacent circular sieve piece 3 on drive shaft 2, the material that is less than one-level screen cut down falls into spring sieve plate 4, and the material that is greater than one-level screen cut 6 flows to the discharge gate along the inclination of composite sieve from 3 top surfaces of circular sieve piece, realizes the elementary screening of material.

A secondary screen slot 7 with the same width is formed between the spring rod 401 and the circular screen pieces 3 on the two sides of the composite screen surface, and the size of the secondary screen slot 7 is matched according to the screening granularity.

The ratchet wheel 5 rotates along with the driving shaft 2, the gradually-changed arc tooth surface of the one-way arc-surface gear teeth 501 lifts up the spring rod 401, the whole spring sieve plate 4 is driven to do reciprocating up-and-down displacement motion along with the arc tooth surface, at the moment, the material and the composite sieve surface do relative motion, the motion direction of the material is perpendicular to the composite sieve surface, and the material obtains additional kinetic energy perpendicular to the composite sieve surface.

Therefore, the loosening kinetic energy of the materials is improved along with the vibration of the composite screen surface, so that the wet and sticky materials can be well loosened, the sieving kinetic energy of the fine materials is also improved, the fine particle materials falling on the screen seams of the spring sieve plate are sieved more conveniently, and the sieving efficiency is improved.

The composite screen of the utility model has better screening effect for coal, ore and fine wet sticky materials with similar properties, has small noise pollution and compact structure, can solve the problems of easy blockage of the screen surface and low screening efficiency in the fine granularity grading process of dry materials, and overcomes the problems of large screen body, large dynamic load, large noise and the like of a powerful vibrating screen; and the defects that the discharging efficiency of residual materials in the sieve cavities of the crossed roller sieve is low and the sieving efficiency is not thoroughly influenced by discharging are overcome.

The screening method of the composite screen comprises the following steps:

a) primary screening:

the material enters a screening chamber 10 from a feeding port 8, the circular screen pieces 3 and the ratchet wheel 5 perform circular motion under the action of the driving shaft 2,

the materials which are smaller than the space between the adjacent circular sieve sheets 3, namely the materials which are smaller than the first-level sieve slits 6 fall down onto the spring sieve plate 4 under the drive of the self weight and the circular sieve sheets,

the materials larger than the first-stage screen slot 6 flow to the discharge port from the top surface of the circular screen piece 3 along the inclination angle of the composite screen;

b) secondary screening:

the materials on the spring sieve plate 4 are driven by the circular sieve sheets 3 to fall below the composite sieve surface, the materials smaller than the second-stage sieve slits 7, namely the materials smaller than the interval between the spring rods 401 and the circular sieve sheets 3 at the two sides fall below the composite sieve surface, the materials larger than the second-stage sieve slits 7 flow to the discharge port 9 along the inclined sieve surface formed by the spring sieve plate 4,

along with the rotation of the ratchet wheel 5, the gradually-changed arc surface of the one-way arc-surface gear teeth 501 lifts the spring rod 401 one by one, then the spring rod 401 falls down, the spring rod 401 generates up-and-down displacement motion by taking the composite screen surface as a reference, the up-and-down displacement action is generated once when the spring rod passes through the arc tooth surface, the cyclic reciprocating motion is performed in such a way to enable the composite screen surface to generate periodic vibration, the vibration direction of the material is perpendicular to the plane of the composite screen surface, and the material obtains additional kinetic energy perpendicular to the composite screen surface.

The utility model discloses composite screen's beneficial effect is:

the screening device has a good screening effect on coal, ore and fine wet-sticky materials with similar properties, and is small in noise pollution and compact in structure;

the problems that the screen surface is easy to block and the screening efficiency is low in the dry material fine granularity grading process can be solved, the advantages of the action of the screen surface of the strong vibrating screen and the screen surface of the crossed roller screen are inherited, the problems of large screen body, large dynamic load, high noise and the like of the strong vibrating screen are solved, and the defects that the discharging efficiency of residual materials in the screen cavity of the crossed roller screen is low and the screening efficiency is not thoroughly influenced by discharging are overcome;

the device has the advantages that the materials have additional kinetic energy perpendicular to the composite screen surface, the loosening kinetic energy of the materials is improved, the wet and sticky materials can be well loosened, the sieving kinetic energy of the fine materials is also improved, the fine particle materials falling on the screen gaps of the spring sieve plate are more cleanly sieved, and the sieving efficiency is improved.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all of which utilize the equivalent structure or equivalent flow transformation made by the content of the specification of the present invention, or directly or indirectly applied to other related technical fields, all included in the same way in the patent protection scope of the present invention.

Claims

1. A composite sieve is positioned in a sieving chamber, one side of the sieving chamber is provided with a feeding port, the other side is provided with a discharging port, the composite sieve is characterized in that,

2. The composite screen of claim 1, wherein the circular screen segments and the ratchet wheel are driven by the drive shaft in a circular motion in the direction of rotation of the drive shaft.

3. The composite screen of claim 1, wherein the spring screen panel includes spring bars on both sides and intermediate connectors securing the spring bars on both sides.

4. The composite screen of claim 3, wherein the ratchet wheel comprises one-way cambered teeth, a web, a shaft hole and a key groove, the ratchet wheel is mounted on the drive shaft through the shaft hole and the key groove, and the ratchet wheel performs one-way intermittent motion in a direction of inclination of the one-way cambered teeth when rotating.

5. The composite screen of claim 4, wherein the spring rods of the spring screen plate are inserted between the circular screen plates, the spring screen plate is arranged obliquely, and the ends of the spring rods on both sides of the spring screen plate are tangent to the middle teeth of the ratchet wheel to form a crossed arrangement.

6. The composite screen of claim 1, wherein primary screen slots of equal width are formed between adjacent circular screen segments on the drive shaft to achieve primary screening of the material.

7. The composite screen of claim 3, wherein secondary screen slots of equal width are formed between the spring rods on the composite screen surface and the circular screen pieces on both sides, and the size of the secondary screen slots is matched according to the screening granularity.

8. The composite screen of claim 5, wherein the ratchet wheel rotates with the drive shaft, and the tapered arc tooth surface of the one-way arc gear lifts the spring rod to drive the spring screen plate to move up and down in a reciprocating motion along with the arc tooth surface.

9. The composite screen of claim 8, wherein the material moves relative to the composite screening surface in a direction perpendicular to the direction of movement of the material.