CN107876395B - Screen cloth, shale shaker and asphalt mixing station - Google Patents

Abstract

The invention relates to the technical field of screening equipment, in particular to a screen, a vibrating screen and an asphalt mixing station. The screen provided by the invention comprises a screen body and a plurality of meshes distributed on the screen body, the screen body is provided with a first screen surface and a second screen surface which are sequentially and oppositely arranged along the falling direction of the material from the mesh openings, and, along the direction of material flow through the screen cloth, at least part of first net face has a plurality of arches, and the arch is towards the direction of keeping away from the second net face salient. The invention can utilize the bulges to turn the materials in the screening process by arranging the bulges on the first net surface of the screen, the rolling of the materials is aggravated, so that the materials are easier to form a layering effect of large-sized materials on the upper parts and small-sized materials on the lower parts, and the screening efficiency is improved.

Description

Screen cloth, shale shaker and asphalt mixing station

Technical Field

The invention relates to the technical field of screening equipment, in particular to a screen, a vibrating screen and an asphalt mixing station.

Background

The vibrating screen is a screening device for screening materials by utilizing vibration generated by vibration excitation of a vibrator, it is widely applied to the fields of regenerated asphalt mixture screening and the like. In the prior art, a vibrating screen generally adopts a woven net, materials are easy to gather in the middle part of a screen during screening, the two sides of the sieve are less in distribution, the distribution uniformity is poor, and the sieve is easy to adhere to the clamping holes, so that the sieving efficiency and the sieving effect are affected. For the regenerated asphalt mixture which is not sufficiently sieved, the quality of asphalt pavement can be influenced after production.

Disclosure of Invention

One technical problem to be solved by the invention is as follows: and the screening efficiency is improved.

In order to solve the above technical problem, a first aspect of the present invention provides a screen, which comprises a screen body and a plurality of meshes distributed on the screen body, wherein the screen body is provided with a first mesh surface and a second mesh surface which are sequentially opposite to each other along the direction that a material falls from the meshes, and at least part of the first mesh surface is provided with a plurality of protrusions along the direction that the material flows through the screen, and the protrusions protrude towards the direction away from the second mesh surface.

Optionally, the protrusions are serrations.

Optionally, the plurality of protrusions are arranged to undulate or zigzag the first web in the direction of material flow through the screen.

Optionally, at least a portion of the plurality of mesh openings distributed over the screen body are variable cross-section mesh openings, wherein: the width of the cross section of the variable-section mesh is gradually increased along the direction of the material flowing through the screen; and/or the width of the longitudinal section of the variable-section mesh is gradually increased along the falling direction of the material from the variable-section mesh.

Optionally, the cross section of the variable cross-section mesh is in a raindrop shape, and the big end of the raindrop shape is positioned at the downstream of the small end of the raindrop shape along the direction of the material flowing through the screen; and/or the longitudinal section of the variable-section mesh is trapezoid, and the large end of the trapezoid is positioned below the small end of the trapezoid along the falling direction of the material from the variable-section mesh.

Alternatively, the variable cross-section mesh is provided on the protrusion on one surface located upstream of two surfaces of the protrusion that are disposed opposite to each other in the direction in which the material flows through the screen, and the width of the cross-section of the variable cross-section mesh becomes gradually larger in the direction in which the material flows through the screen.

Alternatively, the cross-sectional larger end of the variable cross-section mesh is located at the junction of two surfaces of the corresponding protrusion that are disposed opposite each other along the direction of material flow through the screen.

Optionally, the screen is a polyurethane mesh.

The second aspect of the invention also provides a vibrating screen comprising a screen unit and the screen unit comprises a screen of the invention.

Optionally, the screen unit comprises a first screen portion and a second screen portion arranged in sequence in a direction of material flow through the screen unit, material flowing into the screen unit via the first screen portion and out of the screen unit via the second screen portion, and the first screen portion and/or the second screen portion comprises a screen.

Optionally, the second screen portion comprises a screen and the first screen portion comprises a relatively movable first screen layer and a second screen layer.

Optionally, the first screen layer is disposed on a mesh surface of the second screen layer that contacts the material as the material flows through the screen unit, wherein: the first screen mesh layer is a woven mesh or comprises at least one hollow screen pipe, the circumferential surface of the screen pipe is provided with screen holes, and the axial direction of the screen pipe is arranged at an angle with the direction of the material flowing through the screen mesh; and/or the second screen mesh layer is a woven mesh.

Optionally, the screen is rotatably disposed relative to the second screen layer.

Optionally, the first screen portion has a mounting inclination angle greater than a mounting inclination angle of the second screen portion.

The third aspect of the invention also provides an asphalt mixing station comprising a vibrating screen of the invention.

According to the invention, the bulges are arranged on the first net surface of the screen, so that the screen can turn the materials by utilizing the bulges in the screening process, the rolling of the materials is enhanced, the materials are easier to form a layering effect of large-sized materials at the upper part and small-sized materials at the lower part, and the screening efficiency is improved.

Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

Fig. 1 shows a schematic structural view of a vibrating screen according to an embodiment of the present invention.

Fig. 2 shows a schematic perspective view of the first screen section in the embodiment shown in fig. 1.

Fig. 3 shows a schematic top view of the second screen section of the embodiment of fig. 1.

Figure 4 shows a schematic view of section A-A in figure 3.

Fig. 5 shows a schematic front view of the second screen section shown in fig. 3.

In the figure:

1. a first screen section; 11. a screen pipe; 12. a second screen layer; 13. a connecting ring; 111. a support; 112. a connecting rod; 11a, sieve holes;

2. a second screen section; 21. a variable cross-section mesh; 22. saw teeth; 2a, an action net surface;

3. a support beam;

4. a tensioning device.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on embodiments of the present invention, are within the scope of the present invention.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.

In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for defining the components, and are merely for convenience in distinguishing the corresponding components, and the terms are not meant to have any special meaning unless otherwise indicated, so that the scope of the present invention is not to be construed as being limited.

Figures 1-5 illustrate one embodiment of a shaker of the present invention. Wherein figures 3-5 illustrate a screen according to one embodiment of the invention.

Referring to fig. 3-5, the screen provided by the present invention comprises a screen body and a plurality of meshes distributed on the screen body, the screen body is provided with a first screen surface 2a and a second screen surface which are arranged in sequence and oppositely along the falling direction of the material from the mesh openings, and, along the direction of the material flowing through the screen, at least part of the first mesh surface 2a is provided with a plurality of bulges, and the bulges bulge towards the direction away from the second mesh surface.

According to the invention, the first net surface 2a of the screen is provided with the protrusions, so that the screen can turn the materials by using the protrusions, the rolling of the materials is enhanced, the materials are more easily formed into a layering effect that large materials are arranged on the upper parts and small materials are arranged on the lower parts, and the screening efficiency is improved.

In the present invention, the protrusions may be provided in various shapes, wherein preferably, the protrusions may be serrations 22. Since the serrations 22 have sharp tips and are easier to turn over the material relative to other protrusion shapes, providing the protrusions as serrations 22 allows for more efficient layering of the material.

In addition, the invention can further change the shape of the meshes on the screen body. For example, at least part of the plurality of meshes distributed on the screen body may be provided as a variable cross-section mesh 21, in which: the width of the cross section of the variable cross section mesh 21 becomes gradually larger along the direction of the material flowing through the screen; and/or the width of the longitudinal section of the variable-section mesh 21 becomes gradually larger along the direction in which the material falls from the variable-section mesh 21.

The variable cross-section mesh 21 is arranged to have a cross-section width which gradually increases along the flow direction of the material, so that the running track space of the material in the variable cross-section mesh 21 along the flow direction of the material gradually increases, and in this case, even if the material is initially clamped at the small end of the cross-section of the variable cross-section mesh 21, the material clamped at the small end of the cross-section will generate a trend of moving towards the large end of the cross-section along with the forward driving of other materials in the flow, and the clamping stagnation is gradually relieved along with the increasing of the running track space in the process of moving towards the large end of the cross-section, so that the material is more difficult to be clamped in the mesh in the forward flow process, and the risk of clamping holes of the material is reduced.

The variable cross-section mesh 21 is arranged such that the width of the longitudinal section gradually increases along the falling direction of the material, so that the running track space of the material gradually increases when the material passes through the mesh from top to bottom, the hole blocking phenomenon of the material in the falling process can be reduced, and the hole penetration rate can be improved.

Therefore, the invention can effectively reduce the blockage of materials and further improve the screening efficiency by further arranging the variable cross-section mesh 21 on the screen.

The screen mesh can effectively improve screening efficiency and screening effect, so that the screen mesh can be applied to a vibrating screen, and the problems of low screening efficiency and poor screening effect caused by the fact that the existing vibrating screen is completely provided with a woven mesh can be solved, so that the vibrating screen can be efficiently and fully screened. For example, when the vibrating screen with the screen mesh is applied to an asphalt mixing station and is used for screening asphalt mixtures, the vibrating screen can better adapt to the screening requirement of asphalt mixtures with larger viscosity, realizes more sufficient screening of the asphalt mixtures, and further improves the quality of asphalt pavements. Accordingly, the present invention also provides a shaker screen having a screen of the present invention and an asphalt mixing station having a shaker screen of the present invention.

Figures 1-5 illustrate one embodiment of a vibrating screen for an asphalt mixing station of the present invention. The present invention will be described in connection with the embodiments shown in FIGS. 1-5 the screen and shaker of the present invention are more fully described. For convenience of description, the following is defined based on the directions of the material flowing through the vibrating screen in the screening process, namely, the directions or positional relationships indicated by "front, rear, upper, lower, left, right", "transverse, vertical, horizontal", top, bottom ", etc., wherein the material outflow direction is the front, the material inflow direction is the rear, and the left-right direction when facing the front is the left-right direction.

As shown in fig. 1, in this embodiment, the vibrating screen includes a plurality of screen units, each screen unit being arranged at intervals in the up-down direction (height direction), the front and rear ends of each screen unit being respectively tensioned by tensioning means 4, and a plurality of support beams 3 being provided between the front and rear ends of each screen unit for support. When the device is operated, the driving devices such as the vibrating motor and the like drive each screen unit to vibrate, so that the screening of materials (asphalt mixture) on each screen unit can be realized.

In this embodiment, each screen unit adopts the same structural form, so that the structure is simplified and the cost is reduced. As can be seen from fig. 1, the screen unit of this embodiment is divided into two parts in the front-rear direction, a first screen part 1 and a second screen part 2, respectively. During screening, the material flows through the screen unit from back to front, i.e. the material flows into the screen unit from the first screen portion 1 and out of the screen unit via the second screen portion 2, i.e. the first screen portion 1 and the second screen portion 2 are arranged in sequence along the direction of the material flowing through the screen unit (which may be abbreviated as material flow direction, which is shown by arrows in fig. 2, 3 and 5), the first screen portion 1 is located at the feed end and the second screen portion 2 is located at the discharge end.

Also, as shown in fig. 1, in this embodiment, the installation inclination angle of the first screen portion 1 is larger than the installation inclination angle of the second screen portion 2. Because the flow is larger when the material just flows into the screen unit, and the material is gradually screened along with the forward flow of the material, the flow is gradually reduced, and therefore, the installation inclination angle of the first screen part 1 is set to be larger than the installation inclination angle of the second screen part 2, the flow characteristics of the material on the screen unit, which are at least more than one, can be better adapted, so that the material has relatively faster flow velocity on the first screen part 1 positioned at the feeding end, and relatively gentle flow velocity on the second screen part 2 positioned at the discharging end, and a more sufficient screening process can be realized.

It is to be understood that, when the direction in which the material flows through the screen units (material flow direction) is referred to as the longitudinal direction of the first screen portion 1 and the second screen portion 2, the direction perpendicular to the material flow direction may be referred to as the width direction of the first screen portion 1 and the second screen portion 2.

In order to improve the layering effect and to increase the screening efficiency, the screen of the present invention may be provided to the first screen portion 1 and/or the second screen portion 2 of the vibrating screen, that is, only the first screen portion 1 may include the screen of the present invention, only the second screen portion 2 may include the screen of the present invention, and both the first screen portion 1 and the second screen portion 2 may include the screen of the present invention. As one example thereof, in this embodiment, the second screen portion 2 includes the screen of the present invention, that is, this embodiment disposes the screen of the present invention at the discharge end.

Fig. 3-5 show the structure of the second screen portion 2 in this embodiment. The second screen portion 2 of this embodiment will be described further below, first with reference to fig. 3-5.

In this embodiment, the second screen portion 2 adopts a polyurethane net structure; and has a particular first mesh surface shape and mesh shape.

As shown in fig. 3 and 5, the first mesh surface 2a of the second screen portion 2 (i.e., the upper surface of the second screen portion 2) of this embodiment is not a flat surface any more, but has a plurality of protrusions sequentially arranged along the direction in which the material flows through the screen unit, and the protrusions protrude upward (i.e., the direction away from the second mesh surface, which is also the direction in which the material is located). Based on this, in vibration screening process, the second screen cloth portion 2 can utilize the arch on its first screen cloth face 2a to turn the material, aggravate the roll of material, make the material more effectively the layering of in-process that flows forward, more easily form big piece material at last and the layering effect of fritter material under to can improve the screening efficiency of shale shaker, improve the screening quality of shale shaker at the discharge end.

Specifically, as can be seen in fig. 5, in this embodiment, the protrusions are serrations 22; and, in the material flow direction, the plurality of serrations 22 are provided so as to zigzag the action mesh surface 2a of the second mesh portion 2. More specifically, as can be seen from fig. 3, the serrations 22 extend from one end of the width of the second screen portion 2 to the other end of the width of the second screen portion 2, and the plurality of serrations 22 are continuously provided on the entire first mesh surface 2a of the second screen portion 2. Since the serrations 22 have sharp tips and are easier to turn over the material relative to other protrusion shapes, providing the protrusions as serrations 22 allows for more efficient layering of the material. The plurality of saw teeth 22 (protrusions) are arranged to enable the acting net surface 2a of the second screen mesh part 2 to be saw-tooth, so that materials can be continuously rolled and layered in the process of flowing through the second screen mesh part 2 to form a wave-shaped material layer, and a better layering effect is achieved. As a modification of the zigzag shape of the first mesh surface 2a, the plurality of protrusions are arranged to make the first mesh surface 2a of the second screen portion 2 take other shapes such as wavy, and can also make the material roll and delaminate continuously in the process of flowing through the second screen portion 2, thereby improving the layering effect.

In addition, as shown in fig. 3 and 4, the second screen section 2 of this embodiment is also provided with a variable cross-section mesh 21, instead of the conventional constant cross-section shape, and the cross-section and longitudinal section of the variable cross-section mesh 21 are both provided to be variable. As can be seen from fig. 3, in this embodiment, the cross section of the variable-section mesh 21 is in the shape of a raindrop, and the large end of the raindrop is located downstream of the small end of the raindrop in the direction in which the material flows through the screen unit, so that the cross section of the variable-section mesh 21 is varied, and the width of the cross section of the variable-section mesh 21 is gradually increased in the direction in which the material flows through the screen unit. As can be seen from fig. 4, in this embodiment, the longitudinal section of the variable-section mesh 21 is trapezoidal, and the large end of the trapezoid is located below the small end of the trapezoid along the direction in which the material falls from the variable-section mesh 21, so that the longitudinal section of the variable-section mesh 21 is varied, and the width of the longitudinal section of the variable-section mesh 21 is gradually increased along the direction in which the material falls.

The cross section width of the variable-section mesh 21 is gradually increased along the material flow direction, so that the running track space of the material in the variable-section mesh 21 along the material flow direction is gradually increased, and the risk that the material is blocked in the mesh in the forward flow process can be reduced. The variable cross-section mesh 21 is arranged such that the width of the longitudinal section gradually increases along the falling direction of the material, so that the running track space of the material gradually increases when the material passes through the mesh from top to bottom, and the hole blocking phenomenon of the material in the falling process can be reduced.

Also, as shown in fig. 3, in this embodiment, the variable-section mesh 21 is provided on the serration 22 on the upstream one of the two surfaces of the serration 22 that are disposed opposite in the direction in which the material flows through the screen unit. Since the cross section of the variable cross section mesh 21 of this embodiment becomes gradually larger along the material flow direction, the variable cross section mesh 21 is provided on the upstream one of the two surfaces of the serration 22 (protrusions) which are provided opposite to each other along the direction in which the material flows through the screen unit, so that the cross section of the variable cross section mesh 21 can be gradually widened as the material is thrown up, which is more advantageous in preventing the material from getting stuck during tumbling. Further, as can be seen from fig. 3, in this embodiment, the cross-sectional large end of the variable-section mesh 21 is located at the junction (i.e., the tip) of the two surfaces of the corresponding serration 22, which are disposed opposite to each other in the direction in which the material flows through the screen unit, which is advantageous in that: because the material is in the throwing state at the junction of the two surfaces of the saw teeth 22 (protrusions) which are oppositely arranged along the direction of the material flowing through the screen unit, the cross section large end of the variable cross section mesh 21 is arranged at the junction, so that the extrusion of particles can be reduced more effectively, the risk of blocking holes is reduced, and the mesh penetration is facilitated.

It can be seen that in this embodiment, by arranging the second screen portion 2 as the acting mesh surface 2a having a zigzag shape and having the variable cross-section mesh 21 with a cross-section that gradually widens from the rear to the front and a longitudinal cross-section that gradually widens from the top to the bottom, the unobstructed screening of the material can be realized in the length, width and height directions of the second screen portion 2, so that the vibrating screen can effectively layer the material at the discharge end, fully screen the material, and reduce the jamming holes. Moreover, since the second screen mesh part 2 of the embodiment adopts a polyurethane mesh structure, the second screen mesh part 2 can also generate secondary vibration in the screening process, so that the adhesion of wet materials can be effectively avoided, the temporarily clamped materials can be quickly ejected or fall out of the screen, the self-cleaning performance is good, and the holes are not easy to block. In addition, the second vibration of the second screen 2 can make the saw teeth 22 (protrusions) and the variable cross-section mesh 21 on the first screen surface 2a of the second screen 2 more fully play a layering and anti-blocking role, and more effectively improve screening efficiency.

In this embodiment, the first screen section 1 of this embodiment adopts a structure different from that of the first screen section 2, that is, this embodiment does not apply the screen of the present invention to the first screen section 1, that is, the first screen section 1 of this embodiment does not include the screen of the present invention, in order to better accommodate the different material screening characteristics of the feed end and the discharge end, and to reduce the cost, although the first screen section 2 may also be provided to have the same structure as the second screen section 2.

Fig. 1-2 show the structure of the first screen portion 1 in this embodiment. The first screen portion 1 of this embodiment will be described below with reference to fig. 1-2.

As shown in fig. 1-2, in this embodiment, the first screen portion 1 adopts a double screen structure including a first screen layer and a second screen layer 12, and the first screen layer and the second screen layer 12 are provided so as to be relatively movable. Based on this, the first screen portion 1 can utilize the first screen layer and the second screen layer 12 simultaneously to screen the material for the material can be through two-stage screening in the in-process of flowing through the first screen portion 11, compares in single-layer screen structure like this, can realize more abundant screening process. In addition, since the first screen layer and the second screen layer 12 can move relatively, the first screen layer and the second screen layer 12 can move relatively in the vibration screening process, and materials adhered together can be scattered by utilizing the relative movement, so that the materials are not easy to clamp holes. Of course, the number of screen layers of the first screen portion 1 may be plural.

The first screen layer and the second screen layer 12 may both adopt a woven mesh structure, but in order to reduce the blocking holes more effectively and improve the screening efficiency, the first screen layer of this embodiment does not adopt a woven mesh structure any more.

Specifically, as shown in fig. 1 and 2, in this embodiment, the second screen layer 12 is a woven mesh; the first screen layer is disposed on the upper surface of the second screen layer 12, and includes a plurality of hollow screens 11, the screens 11 are sequentially disposed at intervals along the direction of the material flowing through the screen unit, the circumferential surface of each screen 11 is provided with a mesh 11a, and the axial direction of each screen 11 is disposed at an angle to the direction of the material flowing through the screen unit. The upper surface of the second screen layer 12 is the screen surface that contacts the material as it passes through the screen unit, and for convenience of description, the screen surface that contacts the material as it passes through the screen unit will be referred to as the active screen surface hereinafter. Obviously, the first mesh surface 2a of the second screen portion 2 is the acting mesh surface of the second screen portion 2.

Because the screen pipe 11 has certain height, and its axial and material flow direction are arranged at an angle, therefore, screen pipe 11 can control the material thickness, intercept the great material piece in the material that flows forward, make the material be difficult for the card hole, and can guide the material to the width direction motion of first screen cloth portion 1, make the material can spill to the both sides edge of width direction of first screen cloth portion 1 and extend, and can not concentrate in the middle part of width direction of first screen cloth portion 1 again, thereby can reduce the card hole jam of material in first screen cloth portion 1 department, and improve the distribution homogeneity of material in screening process, increase the utilization ratio of first screen cloth portion 1, and then can effectively improve the screening efficiency of shale shaker, and improve the screening effect of shale shaker. In this embodiment in particular, since the installation inclination of the first screen portion 1 is larger than the installation inclination of the second screen portion 2, the flow velocity is faster and the material is more likely to gather in the middle of the width direction when flowing through the first screen portion 1, and therefore, this embodiment sets the first screen portion 1 to have the screen pipe 11 with the axial direction being angled with respect to the flow direction of the material, and can more fully exert the effects of reducing the material blockage and uniformly distributing the material of the screen pipe 11, so that the vibrating screen can more efficiently and highly screen the asphalt mixture. Moreover, the screen pipe 11 of this embodiment can also provide a certain deceleration of the material, this allows a more moderate flow rate of the material through the first screen section 1 with a larger installation angle to be maintained without affecting the screening effect due to too fast flow rates.

It can be seen that, this embodiment sets up the first screen cloth layer that has screen pipe 11 through on the second screen cloth layer 12 of first screen cloth portion 1 to set up screen pipe 11 to self axial and material flow direction certain angle, make first screen cloth portion 1 can utilize screen pipe 11 to intercept the bonding material of great piece, and can utilize screen pipe 11 guide material to be from the middle part of first screen cloth portion 1 to the both sides motion of the width direction of first screen cloth portion 1, reduce the material and concentrate, consequently, can effectively control the material layer thickness, reduce bonding card hole risk, and can improve material distribution uniformity, improve screen cloth utilization ratio, and then can improve the screening efficiency of shale shaker at the feed end.

More specifically, as shown in fig. 2, the axial direction of each screen 11 is arranged in the width direction of the second screen layer 12. Since the material flow direction is along the length direction of the second screen layer 12, this embodiment sets the axial direction of the screen 11 to the width direction of the second screen layer 12, so that the axial direction of the screen 11 is perpendicular to the material flow direction, i.e., so that the screen 11 is arranged laterally. Compared with other angles, when the sieve tube 11 is transversely arranged, the sieve tube 11 can better guide the material to overflow to the two sides, and the material concentration is more effectively reduced. Of course, the lateral arrangement of the screen 11 is not limited to the case where the axial direction of the screen 11 is absolutely perpendicular to the flow direction of the material, and in practice, the screen 11 may be said to be laterally arranged as long as the axial direction of the screen 11 is substantially perpendicular to the flow direction of the material, i.e., the angle therebetween is 90 ° or the angle therebetween is within a moderate deviation of 90 °.

In this embodiment, each screen 11 is constructed identically for simplicity and cost reduction. As shown in fig. 2, the screen 11 of this embodiment includes two support members 111 and a plurality of link members 112, wherein the two support members 111 are disposed opposite to each other at a distance from each other along the axial direction of the screen 11 (the width direction of the second screen layer 12), each link member 112 is connected between the two support members 111 at a distance from each other, and a mesh opening 11a is formed between adjacent link members 112. Thus, a plurality of screen holes 11a are provided on the circumferential surface of each screen pipe 11, each screen hole 11a being elongated, extending from one axial end of the screen pipe 11 to the other axial end of the screen pipe 11, so that the screen holes 11a extend from one widthwise end of the second screen layer 12 to the other. In addition, each connecting rod 112 can deform to a certain extent in the vibration screening process, so that the mesh 11a can be automatically stretched to finely adjust the size of the self-pore.

Because each sieve mesh 11a of sieve tube 11 is long strip shape that extends along second screen cloth layer 12 width direction, the hole is great, and the hole size can finely tune by oneself, consequently, material (especially big piece material) more passes through easily, slightly block the material also can be along with sieve mesh 11a flexible and automatic whereabouts at the vibration in-process, flow forward and sieve again, so the sieve tube 11 of this embodiment still has certain self-cleaning function, be favorable to further reducing the card hole jam risk of material at the feed end, make the shale shaker can have higher screening efficiency.

Also, as shown in FIG. 2, in this embodiment, each screen 11 is connected to the second screen layer 12 by a connecting ring 13. Specifically, as can be seen in FIG. 2, two connection rings 13 are provided for each screen 11, the two connection rings 13 are used to connect the second screen layer 12 with the two supports 111 of the corresponding screen 11, respectively. By providing the connecting ring 13, the screen 11 is allowed to move relative to the second screen layer 12, and the screen 11 is allowed to move not only relative to the second screen layer 12 but also to rotate relative to the second screen layer 12. Because the first screen layer can shake and break up materials relative to the second screen layer 12, and can also layer and clean the materials, and the first screen layer can rotate and break up the materials relative to the second screen layer 12, so that the screen 11 is movable and rotatable relative to the second screen layer 12, the materials can be broken up more fully, the material adhesion clamping holes can be prevented more effectively, and the screening efficiency of the vibrating screen can be further improved. In addition, the screen pipe 11 is movably and rotatably arranged relative to the second screen layer 12, wherein the screen pipe 11 is rotatably arranged relative to the second screen layer 12, so that the screen pipe 11 can fully play roles of intercepting massive materials, uniformly distributing materials and the like, and the screening efficiency of the vibrating screen can be further improved.

As is clear from the above description, in this embodiment, by providing the first screen portion 1 with a double screen structure having the screen pipes 11 arranged laterally, and providing the relative movement relationship between the screen holes 11a of the screen pipes 11 and the second screen layer 12, the material can be more uniformly and less likely to be jammed at the feed end of the vibrating screen, and a more uniform and efficient screening process at the feed end can be realized. Further, since the first screen portion 1 of this embodiment is provided with the plurality of screens 11 at intervals along the longitudinal direction, the material can be sufficiently and efficiently screened by the screens 11 throughout the process of flowing through the first screen portion 1. It should be understood that the number of screens 11 is not limited to a plurality and may be one or two; the number of the connecting rods 112 on the screen 11 is not limited to a plurality, and may be two.

To sum up, this embodiment is through carrying out optimal design to first screen cloth portion 1 and second screen cloth portion 2 of shale shaker for the material is all difficult to appear bonding card hole phenomenon in the in-process of flowing through whole screen cloth unit, can effectively prevent mesh jam, and, utilize the different structural feature of first screen cloth portion 1 and second screen cloth portion 2, can adapt to the different screening characteristics of material at feed end and discharge end better, both can evenly distribute at the feed end, fast screening, can effectively layering again at the discharge end, fully sieves for the shale shaker can realize the screening process of more high-efficient high-quality.

It should be noted that, in order to save the cost, the screen pipe 11 is only disposed at the first screen part 1 in the above embodiment, but in practice, the screen pipe 11 may also be disposed on the second screen part 2, that is, the screen pipe of the present invention may also include the screen pipe 11, so that the screen pipe 11 may also be used to further reduce material blocking and uniformly distribute the material, so that the vibrating screen may achieve more efficient screening at the discharge end; in addition, although the protrusions and the variable cross-section mesh 21 are distributed over the entire second screen section 2 in the above-described embodiment, in practice, the protrusions and the variable cross-section mesh 21 are distributed only over a portion of the second screen section 2, which can also perform a certain corresponding function.

The foregoing description of the exemplary embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims (11)

1. A vibrating screen comprising a screen unit, characterized in that the screen unit comprises a first screen section (1) and a second screen section (2) arranged in sequence along the direction of material flow through the screen unit; material flows into the screen unit via the first screen section (1) and out of the screen unit via the second screen section (2);

and, the second screen portion (2) includes a screen including a screen body and a plurality of mesh openings distributed on the screen body; the screen body is provided with a first screen surface (2 a) and a second screen surface which are arranged in sequence and opposite to each other along the falling direction of the material from the mesh openings, at least part of the first screen surface (2 a) is provided with a plurality of bulges along the flowing direction of the material through the screen, and the bulges bulge towards the direction far away from the second screen surface;

the first screen section (1) comprises a first screen layer and a second screen layer (12) which are relatively movable; the first screen layer is arranged on a screen surface of the second screen layer (12) which is contacted with the material when the material flows through the screen unit; the first screen layer comprises at least one hollow screen (11), wherein a screen hole (11 a) is formed in the circumferential surface of the screen (11), and the axial direction of the screen (11) is arranged at an angle with the direction of the material flowing through the screen;

the screen pipe (11) comprises two supporting pieces (111) and a plurality of connecting rods (112), wherein the two supporting pieces (111) are oppositely arranged at intervals along the axial direction of the screen pipe (11), each connecting rod (112) is connected between the two supporting pieces (111) at intervals, and the sieve holes (11 a) are formed between the adjacent connecting rods (112);

the screen pipe (11) is rotatably arranged relative to the second screen mesh layer (12) so as to break up materials, prevent the materials from binding clamping holes and improve the screening efficiency of the vibrating screen; and the sieve tube (11) is used for guiding the material to move from the middle part of the first screen cloth part (1) to the two sides of the width direction of the first screen cloth part (1), so that the material concentration is reduced.

2. The vibrating screen of claim 1, wherein: the second screen mesh layer (12) is a woven mesh.

3. A vibrating screen according to claim 1, characterized in that the first screen portion (1) is mounted at a larger inclination than the second screen portion (2).

4. The vibrating screen according to claim 1, wherein the protrusions are serrations (22).

5. A vibrating screen according to claim 1, wherein the plurality of projections are arranged to undulate or zigzag the first screen surface (2 a) in the direction of material flow through the screen.

6. The vibrating screen according to any one of claims 1-5, wherein at least some of the plurality of mesh openings distributed over the screen body are variable cross-section mesh openings (21), wherein: the width of the cross section of the variable cross section mesh (21) gradually becomes larger along the direction of the material flowing through the screen; and/or the width of the longitudinal section of the variable section mesh (21) is gradually increased along the falling direction of the material from the variable section mesh (21).

7. A vibrating screen according to claim 6, characterized in that the cross-section of the variable cross-section mesh (21) is in the form of a raindrop, the large end of which is downstream of the small end of the raindrop, in the direction of flow of material through the screen; and/or the longitudinal section of the variable-section mesh (21) is trapezoid, and the big end of the trapezoid is positioned below the small end of the trapezoid along the falling direction of the material from the variable-section mesh (21).

8. A vibrating screen according to claim 6, wherein the variable cross-section mesh (21) is provided on the boss on an upstream one of two surfaces of the boss which are disposed opposite to each other in a direction in which the material flows through the screen, and a width of a cross-section of the variable cross-section mesh (21) becomes gradually larger in the direction in which the material flows through the screen.

9. Vibrating screen according to claim 8, characterized in that the cross-sectional big end of the variable cross-section mesh (21) is located at the junction of two surfaces of the corresponding protrusion, which are oppositely arranged along the direction of material flow through the screen.

10. The vibrating screen of claim 1, wherein the screen is a polyurethane mesh.

11. An asphalt mixing station comprising a vibrating screen as defined in any one of claims 1 to 10.