阅读说明：本技术 用于多级分布筛的支撑架及其使用方法 (Support frame for multi-stage distribution screen and using method thereof ) 是由 陈勇 张伟 何志强 于 2019-10-29 设计创作，主要内容包括：本发明公开一种用于多级分布筛的支撑架,其包括：中空底盘,其由四个L型构件首尾相连构成长方体状框架,L型构件均包括水平部分及竖向部分,四个L型构件由第一宽度方向构件及第二长度方向构件组成；摇摆式支撑座,其包括摇摆环组件和支撑腿组件,摇摆环组件包括两个弧形构件,支撑腿组件包括四个支撑腿,支撑腿的长度小于弧形构件的高度；竖梁组件,其包括四个竖梁,竖梁长度大于多级分布筛的高度之和；摇杆,其延伸于两个相邻长向竖梁之间。本发明还涉及一种用于多级分布筛的支撑架的使用方法。本发明可容许单个操作人员方便地对不同粒级要求的颗粒物进行筛分,该支撑架可牢固固定不同级分布筛,并免除了力度不均导致颗粒物在筛分中掉落破损。(The invention discloses a supporting frame for a multi-stage distribution sieve, which comprises: the hollow chassis is formed by connecting four L-shaped components end to form a rectangular frame, each L-shaped component comprises a horizontal part and a vertical part, and the four L-shaped components comprise a first width direction component and a second length direction component; the swing type supporting seat comprises a swing ring assembly and a supporting leg assembly, the swing ring assembly comprises two arc-shaped members, the supporting leg assembly comprises four supporting legs, and the length of each supporting leg is smaller than the height of each arc-shaped member; the vertical beam assembly comprises four vertical beams, and the length of each vertical beam is greater than the sum of the heights of the multi-stage distribution sieves; and the rocker extends between two adjacent long vertical beams. The invention also relates to a use method of the support frame for the multi-stage distribution sieve. The invention can allow a single operator to conveniently sieve the particles with different particle size requirements, the support frame can firmly fix the distribution sieves of different particle sizes, and the falling and damage of the particles in the sieving process caused by uneven force is avoided.)

1. A support frame for a multi-stage distribution screen, comprising:

the distribution sieve comprises a hollow chassis, a plurality of L-shaped members and a plurality of vertical members, wherein the hollow chassis is formed by connecting four L-shaped members end to form a rectangular frame, the center of the hollow chassis is hollow and is suitable for supporting the distribution sieve, each L-shaped member comprises a horizontal part protruding towards the center of the hollow chassis and a vertical part extending upwards perpendicular to the corresponding horizontal part, and each L-shaped member comprises two first relatively short width direction members extending in parallel along the width direction of the hollow chassis and two second relatively long length direction members extending in parallel along the length direction of the hollow chassis;

the swinging type supporting seat comprises a swinging ring assembly and a supporting leg assembly, wherein the swinging ring assembly comprises two arc-shaped members which are respectively installed at the bottoms of the two first width direction members, the supporting leg assembly comprises four supporting legs which are respectively installed at the bottoms of four joints of the two first width direction members and the two second length direction members, and the length of each supporting leg is smaller than the height of each arc-shaped member;

a vertical beam assembly comprising four vertical beams mounted to upper portions of four junctions of the two first widthwise members and the two second lengthwise members, respectively, and extending upward such that a length of the vertical beams is greater than a sum of heights of the multi-stage distribution screens;

a rocker extending between two adjacent vertical beams parallel to the second lengthwise member.

2. An arcuate member as claimed in claim 1, wherein the arcuate member is a semi-circular member, preferably the support leg has a length of 1/2 the radius of the arcuate member.

3. The support bracket of claim 1 wherein the rocker comprises a first rocker and a second rocker each extending between different ones of said vertical beams.

4. A support as claimed in claim 1, wherein the L-shaped member is formed from angle steel.

5. A support as claimed in claim 1, wherein the parts of the support are joined together by welding.

6. The support frame of claim 1, wherein the multi-stage distribution screen comprises at least four standard screens having different screen opening sizes.

7. The carrier of claim 6 wherein the mesh openings are square openings and the at least four standard screens comprise four standard screens having square opening sizes of 25 x 25mm, 40 x 40mm, 60 x 60mm, 80 x 80mm, respectively.

8. The support frame of any one of claims 1 to 7, adapted for mounting a coke grade distribution screen.

9. Use of a support frame for a multi-stage distribution sieve according to any of claims 1 to 8, characterized in that it comprises the following steps:

firstly, stacking the multi-stage distribution sieves into a hollow chassis of a support frame one by one from bottom to top, so that the distribution sieve at the bottommost layer is in close contact with and firmly clamped on the hollow chassis, and the sum of the heights of the multi-stage distribution sieves is smaller than the height of a vertical beam assembly, wherein the sizes of sieve pores of the multi-stage distribution sieves from the bottommost layer to the highest layer are gradually increased;

next, an operator puts a predetermined number of the granules into the highest-level distribution sieve, wherein the granules with the size smaller than the sieve opening of the highest-level distribution sieve fall to the next-level distribution sieve through the sieve opening of the highest-level distribution sieve, the granules with the size larger than the sieve opening of the highest-level distribution sieve remain in the highest-level distribution sieve, and so on, and each-level distribution sieve intercepts a part of the granules respectively;

next, the operator shakes the rocker back and forth by hands until the screening is finished;

finally, the oversize material on the distribution sieve of each level and the undersize material under the distribution sieve are weighed, and the average particle size of the particles is calculated.

10. The method of use of claim 9, wherein, in the case where the openings of the distribution screen are square openings and the distribution screen includes four standard screens having square opening sizes of 25 x 25mm, 40 x 40mm, 60 x 60mm, 80 x 80mm, respectively, said step of weighing the oversize material on each distribution screen and the undersize material under the distribution screen and calculating the average particle size of the particulate matter comprises:

firstly, weighing the weight of oversize products and undersize products on each level of standard sieve;

secondly, calculating the average particle size composition of the particles at each level by using the following formula:

average size fraction composition of particulate matter (m1 × 90+ m2 × 70+ m3 × 50+ m4 × 32.5+ m5 × 12.5)/100

Wherein m1 represents the oversize weight of an 80mm standard sieve; m2 represents the oversize weight of a 60mm standard sieve; m3 represents the oversize weight of a 40mm standard sieve; m4 represents the oversize weight of a 25mm standard sieve; m5 represents the undersize weight of a 25mm standard sieve.

Technical Field

The invention relates to the technical field of screening equipment, in particular to a supporting frame for a multi-stage distribution screen and a using method thereof.

Background

With the development of the steel industry, the blast furnace tends to be large-sized, so the requirements of the blast furnace on various indexes of coke are more strict and standard. At present, for blast furnaces of various steel enterprises, attention needs to be paid to the cold and hot strength of coke, and higher requirements are also put forward on the average particle size composition of the coke entering the furnace. This makes the detection of the average particle size distribution of coke, which characterizes the degree of coke entering the furnace, a routine task for coke quality inspection workers. Typically, the coke size fraction distribution can be obtained by selecting four standard sieves with square hole sizes of 25 × 25mm, 40 × 40mm, 60 × 60mm and 80 × 80mm, respectively screening 30Kg or more (more than or equal to 30Kg) of coke randomly selected from a sampler step by step, respectively calculating the percentage of the coke on each sieve, and simultaneously calculating the average size fraction composition of the whole coke batch by using a weighted average mode. The standard sieve is a set of sieve which is manufactured according to a certain proportion of sieve pore size, sieve pore size and sieve wire diameter.

At present, the conventional testing method is to use a mechanical sieve for screening test. However, because the mechanical sieve is in a fully closed state, coke is easily blocked and assembled into sieve pores in the vibration screening process, once blockage is cleared from the observation hole or the cover is uncovered, the treatment difficulty is high, and the testing efficiency and the accuracy of a testing result are affected. This has led many businesses to shelve their equipment and instead use manual screening tests. During manual screening test, coke is often taken from a sampler, then two persons stand face to face, one person holds a grip handle of 25 x 25mm (primary screen) with two hands, and the other person shovels a small amount of coke into a screen frame by using a shovel for multiple times, and repeatedly screens back and forth until the coke below 25mm (less than or equal to 25mm) falls into a ground material receiving box from a screen hole completely, and then weighing and metering are carried out; then, the oversize materials of the primary sieve are shoveled into a secondary sieve with the size of 40-40 mm for a few times according to the method, sieving is carried out, and undersize materials are collected and weighed; and the rest is done until 80 x 80mm (four-stage sieve) oversize is weighed. The operation method is time-consuming and labor-consuming, the test needs three persons to be carried out simultaneously, the artificial interference factors are more, when different grades of sieves are used for sieving, the sieving force is not uniform due to the fact that the tests are carried out respectively, partial coke is easy to crack, and the test result is influenced to a certain extent. In addition, among the current prior art, for improving screening efficiency, human factor interference when reducing the screening still develops a coke rotary screen screening weighing device, and the device is full-automatic to be gone on, avoids artifical screening. However, because the coke belongs to irregular blocky thing, need personally submit 5 ~ 15 degrees angles with the horizontal plane when this automatic screening device installs, the automatic from the top of coke gets into each screen cloth in proper order in screening process, can cause the coke originally can become the coke of undersize thing through the sieve mesh perpendicularly by the inevitable, but can not become the oversize thing through the sieve mesh to because the slope and get into in the next level screen cloth, lead to final test result distortion. In addition, the device belongs to a continuous-operation automatic closing device, once coke is blocked in the sieve pores, the machine needs to be stopped and crawled into a barrel for cleaning, and therefore, higher safety risk exists.

Accordingly, there is a need in the art for a support frame for a multi-stage distribution screen that eliminates or alleviates all or some of the above-mentioned deficiencies of the prior art.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention aims to improve the existing manual screening method and provide a support frame for a multi-stage distribution screen, which can allow a single operator to perform screening tests on particulate matters with different grade requirements, can firmly fix the different-stage distribution screen, can uniformly bear force during screening, vertically screen all the particulate matters, and avoid the damage of the particulate matters during falling due to nonuniform force, and can measure and calculate average grade distribution data and further calculate the average grain size composition of the particulate matters after one-time screening is finished by respectively weighing oversize matters, so that the average grade distribution data and the average grain size composition of the particulate matters are conveniently and quickly obtained. In particular, the particulate matter may be coke. The invention also provides a use method of the support frame for the multi-stage distribution sieve.

It is emphasized that, unless otherwise indicated, the terms used herein correspond to the ordinary meanings of the various technical and scientific terms in the art, and the meanings of the technical terms defined in the various technical dictionaries, textbooks, etc.

Thus, in one aspect, according to an embodiment of the present invention, there is provided a support frame for a multi-stage distribution sieve, wherein the support frame comprises:

the distribution sieve comprises a hollow chassis, a plurality of L-shaped members and a plurality of vertical members, wherein the hollow chassis is formed by connecting four L-shaped members end to form a rectangular frame, the center of the hollow chassis is hollow and is suitable for supporting the distribution sieve, each L-shaped member comprises a horizontal part protruding towards the center of the hollow chassis and a vertical part extending upwards perpendicular to the corresponding horizontal part, and each L-shaped member comprises two first relatively short width direction members extending in parallel along the width direction of the hollow chassis and two second relatively long length direction members extending in parallel along the length direction of the hollow chassis;

the swinging type supporting seat comprises a swinging ring assembly and a supporting leg assembly, wherein the swinging ring assembly comprises two arc-shaped members which are respectively installed at the bottoms of the two first width direction members, the supporting leg assembly comprises four supporting legs which are respectively installed at the bottoms of four joints of the two first width direction members and the two second length direction members, and the length of each supporting leg is smaller than the height of each arc-shaped member;

a vertical beam assembly comprising four vertical beams mounted to upper portions of four junctions of the two first widthwise members and the two second lengthwise members, respectively, and extending upward such that a length of the vertical beams is greater than a sum of heights of the multi-stage distribution screens;

a rocker extending between two adjacent vertical beams parallel to the second lengthwise member.

In one embodiment, the arcuate member may be a semi-circular member. Preferably, the length of the support leg may be 1/2 the radius of the arc-shaped member.

In one embodiment, the rocker may include a first rocker and a second rocker each extending between different ones of the vertical beams.

In one embodiment, the L-shaped member may be formed using angle steel.

In one embodiment, the portions of the support frame may be joined together by welding.

In an embodiment, the multi-stage distribution screen may comprise at least four standard screens having different screen aperture sizes.

Further, the mesh openings may be square openings, and the at least four standard screens may include four standard screens having square opening sizes of 25 × 25mm, 40 × 40mm, 60 × 60mm, and 80 × 80mm, respectively.

In other embodiments, the multi-stage distribution screen may include at least four non-standard screens having different screen aperture sizes.

In particular, the above-described support frame may be adapted for mounting a coke grade distribution screen.

In another aspect, according to another embodiment of the present invention, there is provided a method for using the supporting frame for a multi-stage distribution sieve, wherein the method includes the following steps:

firstly, stacking the multi-stage distribution sieves into a hollow chassis of a support frame one by one from bottom to top, so that the distribution sieve at the bottommost layer is in close contact with and firmly clamped on the hollow chassis, and the sum of the heights of the multi-stage distribution sieves is smaller than the height of a vertical beam assembly, wherein the sizes of sieve pores of the multi-stage distribution sieves from the bottommost layer to the highest layer are gradually increased;

next, an operator puts a predetermined number of the granules into the highest-level distribution sieve, wherein the granules with the size smaller than the sieve opening of the highest-level distribution sieve fall to the next-level distribution sieve through the sieve opening of the highest-level distribution sieve, the granules with the size larger than the sieve opening of the highest-level distribution sieve remain in the highest-level distribution sieve, and so on, and each-level distribution sieve intercepts a part of the granules respectively;

next, the operator shakes the rocker back and forth by hands until the screening is finished;

finally, the oversize material on the distribution sieve of each level and the undersize material under the distribution sieve are weighed, and the average particle size of the particles is calculated.

In one embodiment, in the case that the openings of the distribution screen are square openings and the distribution screen comprises four standard screens having square opening sizes of 25 × 25mm, 40 × 40mm, 60 × 60mm and 80 × 80mm, the step of weighing the oversize material on each of the distribution screens and the undersize material under the distribution screens and calculating the average particle size of the particulate material may comprise:

firstly, weighing the weight of oversize products and undersize products on each level of standard sieve;

secondly, calculating the average particle size composition of the particles at each level by using the following formula:

average size fraction composition of particulate matter (m1 × 90+ m2 × 70+ m3 × 50+ m4 × 32.5+ m5 × 12.5)/100

Wherein m1 represents the oversize weight of an 80mm standard sieve; m2 represents the oversize weight of a 60mm standard sieve; m3 represents the oversize weight of a 40mm standard sieve; m4 represents the oversize weight of a 25mm standard sieve; m5 represents the undersize weight of a 25mm standard sieve.

The support frame for the multi-stage distribution sieve and the use method thereof provided by the embodiment of the invention have the following beneficial effects:

on the premise of no need of energy medium or other power, a single operator can perform screening test on the particulate matters with different size requirements; in addition, the support frame can firmly fix different levels of standard sieves without side leakage and material scattering; in the screening process, all the coke is uniformly stressed and is vertically screened, so that the coke is prevented from being damaged in the falling process due to uneven force; after the primary screening is finished, the oversize products are respectively weighed, and then the average size distribution data can be measured, so that the average size distribution data of the particles such as coke can be conveniently and quickly obtained.

Drawings

The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. In the drawings:

fig. 1 schematically illustrates a perspective view of a support frame for a multi-stage distribution screen according to an embodiment;

FIG. 2 schematically illustrates a perspective view of the hollow chassis of FIG. 1; and

fig. 3 schematically illustrates a flow diagram of a method of using a support frame for a multi-stage distribution screen according to another embodiment.

Reference numerals for the elements of the drawings

A support frame 100; a hollow chassis 110; the first widthwise member 111; a second lengthwise member 112; a swing ring assembly 120; an arc-shaped member 121; a support leg assembly 122; support legs 123; a vertical beam assembly 130; a vertical beam 131; a rocker 140.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.

Referring to fig. 1 and 2, according to an embodiment of the present invention, there is provided a support frame 100 for a multi-stage distribution sieve, wherein the support frame 100 includes:

a hollow chassis 110, which is a rectangular parallelepiped frame formed by four L-shaped members connected end to end, the center of the hollow chassis 110 being hollow and adapted to support a distribution screen, wherein each of the four L-shaped members includes a horizontal portion protruding toward the center of the hollow chassis 110, and a vertical portion extending upward perpendicular to the corresponding horizontal portion, and the four L-shaped members are composed of two first relatively short width direction members 111 extending in parallel in a width direction of the hollow chassis 110, and two second relatively long length direction members 112 extending in parallel in a length direction of the hollow chassis 110;

a rocking support base comprising a rocking ring assembly 120 and a support leg assembly 122, wherein the rocking ring assembly 120 comprises two arc members 121 mounted at the bottom of the two first width direction members 111, respectively, wherein the support leg assembly 122 comprises four support legs 123 mounted at the bottom of the four junctions of the two first width direction members 111 and the two second length direction members 112, respectively, wherein the length of the support legs 123 is less than the height of the arc members 121;

a vertical beam assembly 130 including four vertical beams 131, the four vertical beams 131 being respectively mounted to upper portions of four junctions of the two first width direction members 111 and the two second length direction members 112 and extending upward such that the length of the vertical beams 131 is greater than the sum of heights of the multi-stage distribution screens;

a rocker 140 extending between two adjacent vertical beams 131 parallel to the second lengthwise member 112.

In one embodiment, the length of the support leg 123 may be 2/3 the arc of the arcuate member 121.

In one embodiment, the arc member 121 may be a semicircular member. Preferably, the length of the support leg 123 may be 1/2 the radius of the arc member 121.

In one embodiment, the rockers 140 may include a first rocker and a second rocker extending between different ones of the vertical beams 131. The number of rockers 140 can vary, such as one, three, or four, etc., as desired.

In one embodiment, the L-shaped member may be formed using angle steel. In other embodiments, the L-shaped member may be formed from two steel plates welded together perpendicular to each other.

In one embodiment, the portions of the support bracket 100 may be joined together by welding. For example, the two first width direction members 111 and the two second length direction members 112 of the hollow chassis 110 may be welded together. For another example, the vertical beam assemblies 130 may be welded to the upper portions of the four junctions of the two first width direction members 111 and the two second length direction members 112. As another example, the wobble ring assembly 120 may be welded to the bottom of the two first width direction members 111. Furthermore, the support leg assemblies 122 may also be welded to the bottom of the four junctions of the two first width direction members 111 and the two second length direction members 112.

In an embodiment, the multi-stage distribution screen may comprise at least four standard screens having different screen aperture sizes. Further, the mesh openings may be square openings, and the at least four standard screens may include four standard screens having square opening sizes of 25 × 25mm, 40 × 40mm, 60 × 60mm, and 80 × 80mm, respectively. In other embodiments, the mesh may also be round holes or other suitable shapes. In addition, the multi-stage distribution screen may also include three, five or more standard or non-standard screens having different screen opening sizes.

In particular, the support frame 100 described above is suitable for mounting a coke grade distribution screen. In a preferred embodiment, the support frame 100 may be equipped with a four-stage screen for screening coke.

The support frame 100 for the multi-stage distribution screen according to an embodiment of the present invention is further described below by taking the support frame 100 for installing a four-stage screen for screening coke as an example.

Referring to fig. 1 and 2, a support frame 100 for a coke particle fraction distribution screen may be formed by welding a hollow base plate 110, a vertical beam assembly 130, a swinging ring assembly 120, and a support leg assembly 122.

The hollow chassis 110 may be formed by welding two first width direction members 111 and two second length direction members 112 formed of L-shaped angle steel, respectively. During welding, one side face of each angle steel can be vertically placed, the other side face of each angle steel is parallel to the ground, the two angle steels are vertically connected, and notches of the two angle steels are opposite, so that the hollow chassis 110 with a large upper opening area and a small lower opening area is formed by welding, and the chassis of the bottommost layer or the primary standard sieve can be clamped on the hollow chassis 110 without falling.

The radian, end part and other parameters of the two arc-shaped members 121 are completely the same. Both end portions of the arc-shaped member 121 may be welded to both end positions of the bottom portion of the corresponding first width direction member 111, respectively.

At the bottom of four junctions of the two first width direction members 111 and the two second length direction members 112 of the hollow chassis 110, four support legs 123 may be welded, respectively. The length of the support leg 123 may be 1/2 the radius of the arcuate member 121, or some other value less than the radius of the arcuate member 121.

At upper portions of four joints of the two first width direction members 111 and the two second length direction members 112 of the hollow chassis 110, four vertical beams 131 may be welded, respectively. The vertical beams 131 are longer than the sum of the four levels of standard screen height to prevent the standard screen from falling out of the vertical beam assembly 130.

The rockers 140 may be welded at the top ends of two adjacent vertical beams 131 in the extending direction parallel to the second lengthwise member 112. One rocker 140 may be welded over each second lengthwise member 112.

On the other hand, referring to fig. 3, according to another embodiment of the present invention, there is provided a method for using the supporting frame 100 for a multi-stage distribution sieve as described above, wherein the method comprises the following steps:

firstly, stacking the multi-stage distribution sieves into the hollow chassis 110 of the support frame 100 one by one from bottom to top, so that the distribution sieve at the bottommost layer is in close contact with and firmly clamped on the hollow chassis 110, and the sum of the heights of the multi-stage distribution sieves is smaller than the height of the vertical beam 131 assembly 130, wherein the sizes of the sieve pores of the multi-stage distribution sieves from the bottommost layer to the highest layer are gradually increased;

next, an operator puts a predetermined number of the granules into the highest-level distribution sieve, wherein the granules with the size smaller than the sieve opening of the highest-level distribution sieve fall to the next-level distribution sieve through the sieve opening of the highest-level distribution sieve, the granules with the size larger than the sieve opening of the highest-level distribution sieve remain in the highest-level distribution sieve, and so on, and each-level distribution sieve intercepts a part of the granules respectively;

next, the operator shakes the rocker 140 back and forth by hand until the screening is completed;

finally, the oversize material on the distribution sieve of each level and the undersize material under the distribution sieve are weighed, and the average particle size of the particles is calculated.

In the case where the openings of the distribution screen are square openings and the distribution screen includes four standard screens having square opening sizes of 25 × 25mm, 40 × 40mm, 60 × 60mm, and 80 × 80mm, the step of weighing the oversize material on each distribution screen and the undersize material under the distribution screen and calculating the average particle size of the particulate matter may include:

firstly, weighing the weight of oversize products and undersize products on each level of standard sieve;

secondly, the average particle size composition of the particulate matter at each level is calculated by using the following formula 1:

equation 1: average size fraction composition of particulate matter (m1 × 90+ m2 × 70+ m3 × 50+ m4 × 32.5+ m5 × 12.5)/100

Wherein m1 represents the oversize weight of an 80mm standard sieve; m2 represents the oversize weight of a 60mm standard sieve; m3 represents the oversize weight of a 40mm standard sieve; m4 represents the oversize weight of a 25mm standard sieve; m5 represents the undersize weight of a 25mm standard sieve.

The method of using the support frame 100 for a multi-stage distribution screen according to another embodiment of the present invention is further described below by taking the support frame 100 for installing a four-stage screen for screening coke as an example.

The coke size distribution screen support frame 100 is simple and convenient to use. Prior to the test, first, one to four standard sieves having square hole sizes of 25 × 25mm, 40 × 40mm, 60 × 60mm, 80 × 80mm may be stacked in parallel from bottom to top on the support frame 100 in order, wherein the lowest standard sieve of 25 × 25mm is in close contact with and clamped to the hollow base plate 110. Next, an operator can shovel a specified amount of coke from the sampler into the top 80 x 80mm standard sieve several times, and stop the shovel when the sieve has coke on the sieve accounting for 1/3 of the total sieve capacity. Next, the operator can hold the rocker 140 on one side by hand, shake the support frame 100 back and forth according to a certain force until the bottom swing ring assembly 120 rotates to the position where the support leg 123 on one side contacts the ground, stop rotating, and then shake the support frame 100 in the reverse direction until the bottom swing ring assembly 120 rotates to the position where the support leg 123 on the other side contacts the ground, and stop rotating. By analogy, the shaking is carried out repeatedly for a plurality of times until the screening is clean or finished. Finally, the oversize material on the distribution sieve and the undersize material under the distribution sieve can be respectively weighed, then the sieving quantities of all the levels can be respectively added, and the average particle size fraction of the coke can be calculated by using the formula 1. The whole detection process can be easily completed by only one person, and is convenient and quick.

The invention is not limited to screening coke, and can also be used for screening coal, sinter, plant fruits, metal, graphite and other particles.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.

Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.