A multi-layer screen vibrating sieve

Abstract

The present invention relates to the technical field of vibrating screening machines, and particularly relates to a multi-layer screen vibrating screen, which includes a frame and a machine body. The machine body is inclined and arranged on the frame, and a screening mesh is arranged on the surface of the machine body; the screening mesh includes a fixed screen and a movable screen. The fixed screen is fixedly installed on the machine body, and the movable screen is installed on the fixed screen; the movable screen includes a first screening section and a second screening section, and both the first screening section and the second screening section are inclined and arranged on the machine body. By dividing the screening mesh into a fixed screen and a movable screen, the multi-layer screen vibrating screen of the present invention can, if the material deviates to one side, guide the material through the first screening section or the second screening section according to different material deviation situations, avoid the material from concentrating on one side, and improve the uniformity and screening effect of material screening.

Description

Technical Field

[0001] The present invention relates to the technical field of vibrating screening machines, and particularly relates to a multi-layer screen vibrating screen. Background Art

[0002] The circular vibrating screen is a type of screening machine. Since its motion trajectory is approximately circular, it is simply referred to as a circular vibrating screen. The circular vibrating screen is a multi-layer and highly efficient new type of vibrating screen. The circular vibrating screen uses a cylindrical eccentric shaft exciter and eccentric blocks to adjust the amplitude. The material screening flow line is long, and there are many screening specifications. It has the characteristics of reliable structure, strong exciting force, high screening efficiency, low vibration noise, durable, convenient maintenance, and safe use.

[0003] When the circular vibrating screen is in use, due to reasons such as uneven feeding on the screen surface, uneven force on the screen surface, insufficient screen surface inclination angle, screen hole blockage or wear, and installation problems of the vibrating screen equipment, etc., it may cause a part of the screen surface to be overloaded due to excessive materials, while another part of the screen surface runs idly due to less materials. As a result, the materials are concentrated on one side of the screen during the screening of the circular vibrating screen, and then the materials cannot be evenly distributed on the screen, leading to poor screening effect and affecting the service life of the screen. Summary of the Invention

[0004] The present invention provides a multi-layer screen vibrating screen to solve the problem that in the existing circular vibrating screen, the materials are concentrated on one side of the screen during screening, and then the materials cannot be evenly distributed on the screen, resulting in poor screening effect and affecting the service life of the screen.

[0005] A multi-layer screen vibrating screen of the present invention adopts the following technical solution: A multi-layer screen vibrating screen for screening materials includes a frame and a machine body. The machine body is inclined and arranged on the frame, and a screening mesh is arranged on the surface of the machine body; the machine body has a feeding end and a discharging end, and the materials can flow from the feeding end, pass through the screening mesh, and then leave from the discharging end, and the feeding end is located on the side away from the frame in the vertical direction of the discharging end; the screening mesh includes a fixed screen and a movable screen. The fixed screen is fixedly installed on the machine body, and the movable screen is installed on the fixed screen; the movable screen includes a first screening section and a second screening section. Both the first screening section and the second screening section are inclined and arranged on the machine body. The end of the first screening section close to the feeding end is called the first end, and the end of the first screening section close to the discharging end is called the second end; the end of the second screening section close to the feeding end is called the third end, and the end of the second screening section close to the discharging end is called the fourth end; and when the weight of the materials on the side of the first screening section close to the first end exceeds a first preset value, the first screening section can guide the materials from the first end to the second end, and when the weight of the materials on the side of the second screening section close to the third end exceeds the first preset value, the second screening section can guide the materials from the third end to the fourth end.

[0006] Further, the first screening section and the second screening section are arranged in a cross manner.

[0007] Furthermore, two groups of first cantilevers are fixedly arranged on the machine body. A first rotating rod is rotatably connected to each group of first cantilevers. The two first rotating rods are respectively rotatably connected to the first end and the second end of the first screening section; two groups of second cantilevers are fixedly arranged on the machine body. A second rotating rod is rotatably connected to each group of second cantilevers. The two second rotating rods are respectively rotatably connected to the third end and the fourth end of the second screening section.

[0008] Furthermore, a first elastic member is arranged between the first cantilever and the corresponding first rotating rod. The first elastic member is in a compressed state in the initial state; a second elastic member is arranged between the second cantilever and the corresponding second rotating rod. The second elastic member is in a compressed state in the initial state, and in the initial state, both the first screening section and the second screening section are on the same horizontal plane as the fixed screen.

[0009] Furthermore, the movable screen further includes a connecting mesh plate. The connecting mesh plate is quadrilateral. Elastic bands are fixedly connected to the connecting mesh plate. The elastic bands are evenly distributed on the four sides of the connecting mesh plate. The elastic bands are fixedly connected to the fixed screen and are on the same horizontal plane as the fixed screen.

[0010] Furthermore, the first screening section includes a first mesh plate and a second mesh plate. The first mesh plate is located on the side of the second mesh plate close to the feeding end. The first mesh plate and the second mesh plate are connected by a first connecting member. The first connecting member can make the second mesh plate move with the first mesh plate; the second screening section includes a third mesh plate and a fourth mesh plate. The third mesh plate is located on the side of the fourth mesh plate close to the feeding end. The third mesh plate and the fourth mesh plate are connected by a second connecting member. The second connecting member can make the fourth mesh plate move with the third mesh plate; the four sides of the elastic band are respectively connected to the first mesh plate, the second mesh plate, the third mesh plate and the fourth mesh plate; the two first rotating rods are respectively rotatably connected to the first mesh plate and the second mesh plate, and the two second rotating rods are respectively rotatably connected to the third mesh plate and the fourth mesh plate.

[0011] Furthermore, the first connecting member is a first connecting rod, and the second connecting member is a second connecting rod. The first connecting rod includes a first rod section and two second rod sections. The first rod section is arranged along the arrangement direction of the first mesh plate. The second rod sections are arranged along the vertical direction. The two second rod sections are respectively fixedly connected to both ends of the first rod section. The first connecting rod and the second connecting rod have the same structure, and the dimensions of the two second rod sections of the first connecting rod in the vertical direction are smaller than the dimensions of the two second rod sections of the second connecting rod in the vertical direction.

[0012] Further, a first stop bar is provided at the first rotating rod connected to the second screen plate and at the first cantilever rotatably connected to the first rotating rod, and the first stop bar is arranged parallel to the corresponding first rotating rod; a second stop bar is provided at the second rotating rod connected to the fourth screen plate and at the second cantilever rotatably connected to the second rotating rod, and the second stop bar is arranged parallel to the corresponding second rotating rod.

[0013] Further, four mounting openings are formed in the fixed screen, and first side plates are provided on the side edges of the four mounting openings near the feeding end side and on the side edges near the discharging end side, and the first side plates are arranged towards the side of the machine frame in the vertical direction; the first screen plate, the second screen plate, the third screen plate and the fourth screen plate are respectively installed in the four mounting openings, and second side plates are provided on the side edges of the first screen plate, the second screen plate, the third screen plate and the fourth screen plate near the feeding end side and on the side edges near the discharging end side, and the second side plates are arranged towards the side of the machine frame in the vertical direction.

[0014] Further, the elastic band is a rubber band.

[0015] The beneficial effects of the present invention are as follows: in a multi-layer screen vibrating sieve of the present invention, the screening mesh is divided into a fixed screen and a movable screen. During use, materials enter the screening mesh from the feeding end side. When the materials are on the fixed screen, the materials will be screened under the drive of the machine body. When the materials are on the movable screen, if the materials shift to one side, the first screening section or the second screening section will guide the materials according to different material shift situations. That is, when the weight of the materials on the first screening section near one side of the first end exceeds the first preset value, the first screening section can guide the materials from the first end to the second end. When the weight of the materials on the second screening section near one side of the third end exceeds the first preset value, the second screening section can guide the materials from the third end to the fourth end, thereby realizing the two-way guidance of the materials, avoiding the concentration of materials on one side, and improving the uniformity and screening effect of material screening. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a multi-layer screen vibrating sieve of the present invention;

[0018] Figure 2 It is a schematic diagram of the overall structure of an embodiment of a multi-layer screen vibrating sieve of the present invention from another perspective;

[0019] Figure 3 Top view of the overall structure of an embodiment of a multi - layer screen vibrating screen of the present invention;

[0020] Figure 4 is Figure 3 Cross - sectional view along A - A in;

[0021] Figure 5 is Figure 4 Enlarged view at B in;

[0022] Figure 6 Schematic diagram of the first screen plate and the second screen plate of an embodiment of a multi - layer screen vibrating screen of the present invention connected by a first connecting rod.

[0023] In the figure: 100, frame; 200, body; 201, feed end; 202, discharge end; 210, first cantilever; 220, first rotating rod; 230, second cantilever; 240, second rotating rod; 300, fixed screen; 400, movable screen; 410, first screening section; 411, first screen plate; 412, second screen plate; 420, second screening section; 421, third screen plate; 422, fourth screen plate; 430, connecting screen plate; 440, elastic band; 450, first connecting rod; 460, second side plate. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] An embodiment of a multi - layer screen vibrating screen of the present invention is as Figures 1 to 6 shown.

[0026] A multi - layer screen vibrating screen for screening materials, comprising a frame 100 and a body 200. The body 200 is inclined and arranged on the frame 100, and a screening mesh is arranged on the surface of the body 200. The body 200 has a feed end 201 and a discharge end 202. Materials can flow from the feed end 201 to the screening mesh, and after being screened by the screening mesh, leave from the discharge end 202, and the feed end 201 is located on the side of the discharge end 202 away from the frame 100 in the vertical direction.

[0027] The screening mesh includes a fixed screening mesh 300 and a movable screening mesh 400. The fixed screening mesh 300 is fixedly installed on the machine body 200, and the movable screening mesh 400 is installed on the fixed screening mesh 300. The movable screening mesh 400 includes a first screening section 410 and a second screening section 420. Both the first screening section 410 and the second screening section 420 are inclinedly arranged on the machine body 200. One end of the first screening section 410 close to the feeding end 201 is called the first end, and one end of the first screening section 410 close to the discharging end 202 is called the second end. One end of the second screening section 420 close to the feeding end 201 is called the third end, and one end of the second screening section 420 close to the discharging end 202 is called the fourth end. And when the weight of the material on the side of the first screening section 410 close to the first end exceeds the first preset value, the first screening section 410 can guide the material from the first end to the second end. When the weight of the material on the side of the second screening section 420 close to the third end exceeds the first preset value, the second screening section 420 can guide the material from the third end to the fourth end.

[0028] In this embodiment, the screening mesh is divided into a fixed screening mesh 300 and a movable screening mesh 400. During use, the material enters the screening mesh from the side of the feeding end 201. When the material is on the fixed screening mesh 300, the material will be screened under the drive of the machine body 200. When the material is on the movable screening mesh 400, if the material deviates to one side, then according to the different deviation situations of the material, the first screening section 410 or the second screening section 420 is used to guide the material. That is, when the weight of the material on the side of the first screening section 410 close to the first end exceeds the first preset value, the first screening section 410 can guide the material from the first end to the second end. When the weight of the material on the side of the second screening section 420 close to the third end exceeds the first preset value, the second screening section 420 can guide the material from the third end to the fourth end, thereby realizing the two-way guidance of the material, avoiding the material concentrating on one side, and improving the uniformity and screening effect of the material screening.

[0029] In this embodiment, the first screening section 410 and the second screening section 420 are cross - arranged.

[0030] By cross - arranging the first screening section 410 and the second screening section 420, when the material arrives at the first screening section 410 and the second screening section 420, the first screening section 410 and the second screening section 420 can simultaneously sense the material and select the first screening section 410 or the second screening section 420 for guidance according to the different deviation directions of the material, improving the accuracy of the guidance.

[0031] In this embodiment, two groups of first cantilevers 210 are fixedly arranged on the machine body 200. A first rotating rod 220 is rotatably connected to each group of first cantilevers 210. The two groups of first rotating rods 220 are respectively rotatably connected to the first end and the second end of the first screening section 410. Two groups of second cantilevers 230 are fixedly arranged on the machine body 200. A second rotating rod 240 is rotatably connected to each group of second cantilevers 230. The two groups of second rotating rods 240 are respectively rotatably connected to the third end and the fourth end of the second screening section 420. Further, a first elastic member is arranged between the first cantilever 210 and the corresponding first rotating rod 220. The first elastic member is a torsion spring, and the first elastic member is in a compressed state in the initial state. A second elastic member is arranged between the second cantilever 230 and the corresponding second rotating rod 240. The second elastic member is a torsion spring, and the second elastic member is in a compressed state in the initial state. And in the initial state, both the first screening section 410 and the second screening section 420 are on the same horizontal plane as the fixed screen 300.

[0032] Specifically, each group of first cantilevers 210 includes two first arms, and each first arm is rotatably connected to a first rotating rod 220. Each group of second cantilevers 230 includes two second arms, and each second arm is rotatably connected to a second rotating rod 240.

[0033] By arranging a first elastic member between the first cantilever 210 and the corresponding first rotating rod 220, and arranging a second elastic member between the second cantilever 230 and the corresponding second rotating rod 240, when the weight of the material falling on the first screening section 410 is less than the first preset value, the first screening section 410 will not be able to overcome the torsion force of the corresponding first elastic member. Similarly, when the weight of the material falling on the second screening section 420 is less than the first preset value, the second screening section 420 will not be able to overcome the torsion force of the corresponding second elastic member. That is to say, when the material enters the first screening section 410 and the second screening section 420 from the feed end 201, if the degree of material offset is not large, or there is no material offset, at this time, both the first screening section 410 and the second screening section 420 are on the same horizontal plane as the fixed screen 300 and no guiding is performed.

[0034] In this embodiment, the movable screen 400 further includes a connecting mesh plate 430. The connecting mesh plate 430 is quadrilateral, specifically a rhombus. An elastic band 440 is fixedly connected to the connecting mesh plate 430. The elastic band 440 is a rubber band. The elastic bands 440 are evenly distributed on the four sides of the connecting mesh plate 430, and the elastic bands 440 are fixedly connected to the fixed screen 300 and are on the same horizontal plane as the fixed screen 300.

[0035] The first screening section 410 includes a first mesh plate 411 and a second mesh plate 412. The first mesh plate 411 is located on the side of the second mesh plate 412 closer to the feed end 201, that is, the first mesh plate 411 is at the first end of the first screening section 410, and the second mesh plate 412 is at the second end of the first screening section 410. The first mesh plate 411 and the second mesh plate 412 are connected by a first connecting member, and the first connecting member can make the second mesh plate 412 move with the first mesh plate 411.

[0036] The second screening section 420 includes a third mesh plate 421 and a fourth mesh plate 422. The third mesh plate 421 is located on the side of the fourth mesh plate 422 closer to the feed end 201, that is, the third mesh plate 421 is at the third end of the second screening section 420, and the fourth mesh plate 422 is at the fourth end of the second screening section 420. The third mesh plate 421 and the fourth mesh plate 422 are connected by a second connecting member, and the second connecting member can make the fourth mesh plate 422 move with the third mesh plate 421.

[0037] The first mesh plate 411, the second mesh plate 412, the third mesh plate 421, and the fourth mesh plate 422 are all trapezoidal. Four sides of the elastic band 440 are respectively connected to the first mesh plate 411, the second mesh plate 412, the third mesh plate 421, and the fourth mesh plate 422. Two first rotating rods 220 are respectively rotatably connected to the first mesh plate 411 and the second mesh plate 412, and two second rotating rods 240 are respectively rotatably connected to the third mesh plate 421 and the fourth mesh plate 422.

[0038] By providing a connecting mesh plate 430 and connecting the first mesh plate 411 and the second mesh plate 412 through the connecting mesh plate 430, and connecting the third mesh plate 421 and the fourth mesh plate 422 through the connecting mesh plate 430, the cross - arranged first screening section 410 and the second screening section 420 can be independently guided.

[0039] Specifically, the first connecting member is a first connecting rod 450, and the second connecting member is a second connecting rod. The first connecting rod 450 includes a first rod section and two second rod sections. The first rod section and the two second rod sections are an integrally formed structure. The first rod section is arranged along the arrangement direction of the first mesh plate 411, and the second rod sections are arranged vertically. The two second rod sections are respectively fixedly connected to both ends of the first rod section. The first connecting rod 450 and the second connecting rod have the same structure, and the dimensions of the two second rod sections of the first connecting rod 450 in the vertical direction are smaller than the dimensions of the two second rod sections of the second connecting rod in the vertical direction.

[0040] By setting the dimensions of the two second rod sections of the first connecting rod 450 in the vertical direction to be smaller than the dimensions of the two second rod sections of the second connecting rod in the vertical direction, when the first connecting rod 450 yaws, it will not interfere with the second connecting rod. Similarly, when the second connecting rod yaws, it will not interfere with the first connecting rod 450.

[0041] In this embodiment, a first stop bar is provided at the first rotating rod 220 connected to the second screen plate 412 and at the first cantilever 210 rotatably connected to the first rotating rod 220. The first stop bar is arranged in parallel with the corresponding first rotating rod 220. That is, the first stop bar is arranged at the rotational connection between the first rotating rod 220 and the first cantilever 210, and the first stop bar is used to limit the increase in the angle between the first cantilever 210 and the first rotating rod 220 rotatably connected to the first cantilever 210.

[0042] A second stop bar is provided at the second rotating rod 240 connected to the fourth screen plate 422 and at the second cantilever 230 rotatably connected to the second rotating rod 240. The second stop bar is arranged in parallel with the corresponding second rotating rod 240. That is, the second stop bar is arranged at the rotational connection between the second rotating rod 240 and the second cantilever 230, and the second stop bar is used to limit the increase in the angle between the second cantilever 230 and the second rotating rod 240 rotatably connected to the second cantilever 230.

[0043] In this embodiment, by providing the first stop bar and the second stop bar, when the first screen plate 411 senses the material, it can be avoided that after the material flows onto the second screen plate 412, the second screen plate 412 is deflected by the acting force of the material, resulting in an increase in the angle between the first cantilever 210 connected to the second screen plate 412 and the first rotating rod 220 rotatably connected to the first cantilever 210. That is, the angle at this position can only decrease and cannot increase. Furthermore, during guiding, only the first screen plate 411 can move downward relatively, while the second screen plate 412 can only move upward relatively. That is, during guiding, within the first screening section 410, the guiding of the first screen plate 411 to the second screen plate 412 is one-way. This setting can avoid the situation that when the material flows from the first screen plate 411 to the second screen plate 412, if the second screen plate 412 senses synchronously, the material will flow back to the first screen plate 411, resulting in inaccurate sensing. The principle of setting the second stop bar is the same and will not be elaborated here.

[0044] In this embodiment, four mounting openings are formed in the fixed screen 300. First side plates are provided on the side edges of the four mounting openings near the feeding end 201 and on the side edges near the discharging end 202, and the first side plates are arranged towards the side of the frame 100 in the vertical direction. The first screen plate 411, the second screen plate 412, the third screen plate 421, and the fourth screen plate 422 are respectively installed in the four mounting openings, and second side plates 460 are provided on the side edges of the first screen plate 411, the second screen plate 412, the third screen plate 421, and the fourth screen plate 422 near the feeding end 201 and on the side edges near the discharging end 202, and the second side plates 460 are arranged towards the side of the frame 100 in the vertical direction.

[0045] By setting the first side plate and the second side plate 460, the sealing performance of the installation of the first screen plate 411, the second screen plate 412, the third screen plate 421, and the fourth screen plate 422 in the installation opening can be ensured, preventing material leakage when the material biases to one side, causing the first screen plate 411 to descend and the second screen plate 412 to ascend (the entire first screening section 410 tilts), or the third screen plate 421 to descend and the fourth screen plate 422 to ascend (the entire second screening section 420 tilts). Moreover, when the entire first screening section 410 or the second screening section 420 tilts, the inclined first screening section 410 or the second screening section 420 can cooperate with the first side plate or the second side plate 460 to guide the material.

[0046] Combined with the above embodiments, the specific working process is as follows:

[0047] During use, the material enters the screening mesh from one side of the feeding end 201. When the material is on the fixed screen 300, the material will be screened under the drive of the machine body 200. When the material is on the movable screen 400.

[0048] Taking the first screening section 410 as an example, when the weight of the material on the first screen plate 411 is within the first preset value, the weight of the material cannot overcome the torsion of the first elastic member. Thus, the material cannot cause the first screen plate 411 to descend at this time. At this time, both the first screening section 410 and the second screening section 420 are on the same horizontal plane as the fixed screen 300 and do not conduct guiding.

[0049] When the weight of the material on the first screening section 410 near the first end side exceeds the first preset value, it will cause the first screen plate 411 to descend. For details, please refer to Figure 4 and Figure 5 . The second screen plate 412 is on the left side, and the first screen plate 411 is on the right side. When the first screen plate 411 descends, it will drive the first rotating rod 220 connected to it to swing, and the corresponding first elastic member will release the stored energy, increasing the angle between the first rotating rod 220 and the first cantilever 210 corresponding to it. Then, through the first connecting rod 450, the second screen plate 412 is driven to move upward, making the entire first screening section 410 tilt. When the second screen plate 412 rotates and ascends, it will drive the first rotating rod 220 connected to it to swing, and the corresponding first elastic member will rotate and store energy, reducing the angle between the first rotating rod 220 and the first cantilever 210 corresponding to it.

[0050] See Figure 1 As shown, since the entire machine body 200 is inclinedly arranged on the frame 100, the material has a tendency to move from one side of the feeding end 201 to one side of the discharging end 202.

[0051] Therefore, after the entire first screening section 410 is tilted, the first mesh plate 411 will be tilted relative to the fixed screen 300, that is, the first mesh plate 411 is sunken relative to the plane where the fixed screen 300 is located, and the second mesh plate 412 is convex relative to the plane where the fixed screen 300 is located. Furthermore, when the material passes over the first mesh plate 411, it will be blocked by the first side plate at the installation opening and guided by the inclined surface of the first side plate (since the first mesh plate 411 itself is tilted, the installation opening is tilted, and the first side plate is tilted) to move to the side of the second mesh plate 412 after passing through the connecting mesh plate 430. And after the weight of the material on the first mesh plate 411 is less than or equal to the first preset value again, the first elastic member twists and resets. The guiding principle of the second screening section 420 is the same as that of the first screening section 410, and will not be elaborated here.

[0052] It should be particularly noted that, in this process, since the lowering of the first mesh plate 411 drives the second mesh plate 412 to rise, the elastic bands 440 between the first mesh plate 411 and the connecting mesh plate 430 and the elastic bands 440 between the second mesh plate 412 and the connecting mesh plate 430 will both deform, but the degree of deformation is not large. Therefore, the resistance of the elastic bands 440 is ignored here. At the same time, after the first mesh plate 411 descends and the second mesh plate 412 rises, the entire first screening section 410 will be tilted, which will cause a guiding force from the second mesh plate 412 to the first mesh plate 411 on the material when the material moves to the surfaces of the first mesh plate 411 and the second mesh plate 412 under the action of the tilted first screening section 410. However, since the material will continue to move towards the discharge end 202 after staying briefly on the surfaces of the first mesh plate 411 and the second mesh plate 412, this guiding effect can be ignored and has little impact during the entire guiding process.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A multi-layer mesh vibrating screen for screening materials, characterized in that: The machine comprises a frame and a body, wherein the body is tiltedly arranged on the frame, and a screen mesh is arranged on the surface of the body; the body is provided with a feed end and a discharge end, and the material can pass through the screen mesh from the feed end and then leave from the discharge end, and the feed end is located on a side of the discharge end away from the frame in the vertical direction; The screening net includes a fixed screen and a movable screen, the fixed screen is fixedly installed on the machine body, and the movable screen is installed on the fixed screen; the movable screen includes a first screening section and a second screening section, both of which are tiltedly arranged on the machine body, the end of the first screening section close to the feed end is called the first end, and the end of the first screening section close to the discharge end is called the second end; the end of the second screening section close to the feed end is called the third end, and the end of the second screening section close to the discharge end is called the fourth end; and when the weight of the material on the side of the first screening section close to the first end exceeds the first preset value, the first screening section can guide the material from the first end to the second end, and when the weight of the material on the side of the second screening section close to the third end exceeds the first preset value, the second screening section can guide the material from the third end to the fourth end.

2. A multi-layer mesh vibrating screen according to claim 1, characterized in that: The first screening material section and the second screening material section are arranged crosswise.

3. A multi-layer mesh vibrating screen according to claim 1, characterized in that: Two groups of first cantilevers are fixedly arranged on the machine body, each group of first cantilevers is rotatably connected to a first rotating rod, and the two groups of first rotating rods are rotatably connected to the first end and the second end of the first screening section respectively; two groups of second cantilevers are fixedly arranged on the machine body, each group of second cantilevers is rotatably connected to a second rotating rod, and the two groups of second rotating rods are rotatably connected to the third end and the fourth end of the second screening section respectively.

4. A multi-layer mesh vibrating screen according to claim 3, characterized in that: A first elastic member is arranged between the first cantilever and the first rotating rod corresponding thereto, and the first elastic member is in a compressed state in an initial state; A second elastic member is arranged between the second cantilever and the corresponding second rotating rod. In the initial state, the second elastic member is in a compressed state, and in the initial state, the first screening material section and the second screening material section are both on the same horizontal plane with the fixed screen.

5. A multi-layer mesh vibrating screen according to claim 4, characterized in that: The movable screen also includes a connecting mesh plate, which is a quadrilateral and fixedly connected with an elastic belt, which is evenly distributed on the four sides of the connecting mesh plate. The elastic belt is fixedly connected to the fixed screen and is on the same horizontal plane as the fixed screen.

6. A multi-layer mesh vibrating screen according to claim 5, characterized in that: The first screening section includes a first mesh plate and a second mesh plate, the first mesh plate is located on a side of the second mesh plate close to the feed end, the first mesh plate and the second mesh plate are connected by a first connecting member, and the first connecting member enables the second mesh plate to move with the first mesh plate; the second screening section includes a third mesh plate and a fourth mesh plate, the third mesh plate is located on a side of the fourth mesh plate close to the feed end, the third mesh plate and the fourth mesh plate are connected by a second connecting member, and the second connecting member enables the fourth mesh plate to move with the third mesh plate; the four side edges of the elastic band are respectively connected to the first mesh plate, the second mesh plate, the third mesh plate and the fourth mesh plate; the two first rotating rods are respectively rotatably connected to the first mesh plate and the second mesh plate, and the two second rotating rods are respectively rotatably connected to the third mesh plate and the fourth mesh plate.

7. A multi-layer mesh vibrating screen according to claim 6, characterized in that: The first connecting member is a first connecting rod, and the second connecting member is a second connecting rod. The first connecting rod includes a first rod segment and two second rod segments. The first rod segment is arranged along the arrangement direction of the first mesh plate, and the second rod segment is arranged along the vertical direction. The two second rod segments are respectively fixedly connected to both ends of the first rod segment. The first connecting rod and the second connecting rod have the same structure, and the size of the two second rod segments of the first connecting rod in the vertical direction is smaller than the size of the two second rod segments of the second connecting rod in the vertical direction.

8. A multi-layer mesh vibrating screen according to claim 7, characterized in that: A first blocking rod is arranged at the first rotating rod connected to the second mesh plate and the first cantilever rotatably connected to the first rotating rod, and the first blocking rod is arranged parallel to the first rotating rod corresponding to it; a second blocking rod is arranged at the second rotating rod connected to the fourth mesh plate and the second cantilever rotatably connected to the second rotating rod, and the second blocking rod is arranged parallel to the second rotating rod corresponding to it.

9. A multi-layer mesh vibrating screen according to claim 8, characterized in that: Four installation openings are opened on the fixed screen, and the first side plates are arranged on the sides of the four installation openings close to the feed end and the sides close to the discharge end, and the first side plates are arranged toward one side of the frame in the vertical direction; the first mesh plate, the second mesh plate, the third mesh plate and the fourth mesh plate are respectively installed in the four installation openings, and the second side plates are arranged on the sides of the first mesh plate, the second mesh plate, the third mesh plate and the fourth mesh plate close to the feed end and the sides close to the discharge end, and the second side plates are arranged toward one side of the frame in the vertical direction.

10. The multi-layer mesh vibrating screen according to claim 5, characterized in that: The elastic band is a rubber band.

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