Vibrating screen with multiple layers of screen meshes

Abstract

The invention relates to the technical field of vibration screening machines, in particular to a multi-layer screen vibrating screen which comprises a rack and a machine body, the machine body is obliquely arranged on the rack, and a material screening net is arranged on the surface of the machine body; the material screening net comprises a fixed screening net and a movable screening net, the fixed screening net is fixedly installed on the machine body, and the movable screening net is installed on the fixed screening net; the movable screen comprises a first material screening section and a second material screening section, and the first material screening section and the second material screening section are both obliquely arranged on the machine body. According to the vibrating screen with the multiple layers of screen meshes, the screen meshes are divided into the fixed screen meshes and the movable screen meshes, if materials deviate towards one side, the materials are guided through the first screening section or the second screening section according to different deviation conditions of the materials, the materials are prevented from being concentrated on one side, and the material screening uniformity and the screening effect are improved.

Description

Technical Field

[0001] This invention relates to the field of vibrating screen technology, and specifically to a multi-layer vibrating screen. Background Art

[0002] A circular vibrating screen is a type of screening machine. Because its motion trajectory approximates a circle, it is simply called a circular vibrating screen. It is a multi-layered, high-efficiency new type of vibrating screen. The circular vibrating screen uses a cylindrical eccentric shaft vibrator and adjustable eccentric blocks to control the amplitude. It features a long material flow path, multiple screening specifications, reliable structure, strong excitation force, high screening efficiency, low vibration noise, durability, convenient maintenance, and safe operation.

[0003] When using a circular vibrating screen, uneven feeding, uneven force on the screen surface, insufficient screen inclination angle, screen hole blockage or wear, and installation problems may cause some screen surfaces to be overloaded due to excessive material, while other screen surfaces may be unloaded due to insufficient material. This results in material concentrating on one side of the screen during screening, making it impossible to distribute the material evenly on the screen, leading to poor screening effect and affecting the service life of the screen. Summary of the Invention

[0004] This invention provides a multi-layer vibrating screen to solve the problem that in existing circular vibrating screens, materials are concentrated on one side of the screen during screening, which prevents the materials from being evenly distributed on the screen, resulting in poor screening effect and affecting the service life of the screen.

[0005] The present invention provides a multi-layer vibrating screen with the following technical solution: A multi-layer vibrating screen for screening materials includes a frame and a body. The body is inclinedly mounted on the frame, and a screen is provided on the surface of the body. The body has an inlet end and an outlet end, allowing materials to flow from the inlet end to the outlet end after passing through the screen. The inlet end is located on the side of the outlet end that is vertically away from the frame. The screen includes a fixed screen and a movable screen. The fixed screen is fixedly mounted on the body, and the movable screen is mounted on the fixed screen. The movable screen includes a first screening section and a second screening section. The screening sections are all inclined on the machine body. The end of the first screening section near the feed end is called the first end, and the end of the first screening section near the discharge end is called the second end. The end of the second screening section near the feed end is called the third end, and the end of the second screening section near the discharge end is called the fourth end. When the weight of the material on the side of the first screening section near the first end exceeds the first preset value, the first screening section 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 near the third end exceeds the first preset value, the second screening section can guide the material from the third end to the fourth end.

[0006] Furthermore, the first screening section and the second screening section are arranged alternately.

[0007] Furthermore, two sets of first cantilever arms are fixedly installed on the machine body, and a first rotating rod is rotatably connected to each set of first cantilever arms. The two sets of first rotating rods are rotatably connected to the first end and the second end of the first screening section, respectively. Two sets of second cantilever arms are fixedly installed on the machine body, and a second rotating rod is rotatably connected to each set of second cantilever arms. The two sets of second rotating rods are rotatably connected to the third end and the fourth end of the second screening section, respectively.

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

[0009] Furthermore, the movable screen also includes a connecting screen plate, which is quadrilateral in shape. An elastic band is fixedly connected to the connecting screen plate. The elastic band is evenly distributed on the four sides of the connecting screen plate. The elastic band is fixed to the fixed screen and is on the same horizontal plane as the fixed screen.

[0010] Furthermore, the first screening section includes a first screen plate and a second screen plate, with the first screen plate located on the side of the second screen plate near the feed end. The first screen plate and the second screen plate are connected by a first connector, which enables the second screen plate to move with the first screen plate. The second screening section includes a third screen plate and a fourth screen plate, with the third screen plate located on the side of the fourth screen plate near the feed end. The third screen plate and the fourth screen plate are connected by a second connector, which enables the fourth screen plate to move with the third screen plate. The four sides of the elastic band are respectively connected to the first screen plate, the second screen plate, the third screen plate, and the fourth screen plate. Two first rotating rods are rotatably connected to the first screen plate and the second screen plate, respectively, and two second rotating rods are rotatably connected to the third screen plate and the fourth screen plate, respectively.

[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 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 vertical dimension of the two second rod segments of the first connecting rod is smaller than the vertical dimension of the two second rod segments of the second connecting rod.

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

[0013] Furthermore, the fixed screen has four mounting holes. A first side plate is provided on the side of each mounting hole near the feed end and the side near the discharge end. The first side plate is vertically oriented towards the machine frame. The first screen plate, the second screen plate, the third screen plate, and the fourth screen plate are respectively installed in the four mounting holes. A second side plate is provided on the side of each screen plate near the feed end and the side near the discharge end. The second side plate is vertically oriented towards the machine frame.

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

[0015] The beneficial effects of this invention are as follows: This multi-layer vibrating screen divides the screening mesh into a fixed screen and a movable screen. During use, material enters the screening mesh from the feed end. When the material is on the fixed screen, it is screened under the drive of the machine. When the material is on the movable screen, if it shifts to one side, the first or second screening section guides the material according to the shift. Specifically, when the weight of the material on the first screening section near the first end exceeds a first preset value, the first screening section guides the material from the first end to the second end. When the weight of the material on the second screening section near the third end exceeds the first preset value, the second screening section guides the material from the third end to the fourth end. This achieves bidirectional guidance of the material, preventing material concentration on one side and improving the uniformity and screening effect of the material screening. Attached Figure Description

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the multi-layer vibrating screen of the present invention; Figure 2 This is a schematic diagram of the overall structure of an embodiment of the multi-layer vibrating screen of the present invention from another perspective; Figure 3 This is a top view of the overall structure of an embodiment of the multi-layer vibrating screen of the present invention; Figure 4 for Figure 3 Sectional view at point AA along the middle; Figure 5 for Figure 4 Enlarged view of point B in the middle; Figure 6 This is a schematic diagram showing the first and second screen plates of an embodiment of a multi-layer vibrating screen according to the present invention connected by a first connecting rod.

[0018] In the diagram: 100, frame; 200, machine 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 DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] An embodiment of the multi-layer vibrating screen of the present invention, such as... Figures 1 to 6 As shown.

[0021] A multi-layer vibrating screen for screening materials includes a frame 100 and a body 200. The body 200 is inclinedly mounted on the frame 100, and a screen is provided 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 screen and exit from the discharge end 202 after being screened by the screen. The feed end 201 is located on the side of the discharge end 202 that is vertically away from the frame 100.

[0022] The screening screen includes a fixed screen 300 and a movable screen 400. The fixed screen 300 is fixedly installed on the machine body 200, and the movable screen 400 is installed on the fixed screen 300. The movable screen 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. The end of the first screening section 410 near the feed end 201 is called the first end, and the end of the first screening section 410 near the discharge end 202 is called the second end. The end of the second screening section 420 near the feed end 201 is called the third end, and the end of the second screening section 420 near the discharge end 202 is called the fourth end. Furthermore, when the weight of the material on the side of the first screen section 410 near the first end exceeds the first preset value, the first screen 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 screen section 420 near the third end exceeds the first preset value, the second screen section 420 can guide the material from the third end to the fourth end.

[0023] This embodiment divides the screening mesh into a fixed screen 300 and a movable screen 400. In use, the material enters the screening mesh from the feed end 201. When the material is on the fixed screen 300, it will be screened by the machine body 200. When the material is on the movable screen 400, if the material shifts to one side, the first screening section 410 or the second screening section 420 will guide the material according to the different shift conditions. That is, when the weight of the material on the first screening section 410 near the first end exceeds a 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 second screening section 420 near 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 achieving bidirectional guidance of the material, avoiding material concentration on one side, and improving the uniformity and screening effect of material screening.

[0024] In this embodiment, the first screening section 410 and the second screening section 420 are arranged alternately.

[0025] By interleaving 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 to guide it according to the different offset directions of the material, thereby improving the accuracy of guidance.

[0026] In this embodiment, two sets of first cantilever arms 210 are fixedly installed on the machine body 200. Each set of first cantilever arms 210 is rotatably connected to a first rotating rod 220, and the two sets of first rotating rods 220 are rotatably connected to the first end and the second end of the first screening section 410, respectively. Two sets of second cantilever arms 230 are fixedly installed on the machine body 200. Each set of second cantilever arms 230 is rotatably connected to a second rotating rod 240, and the two sets of second rotating rods 240 are rotatably connected to the third end and the fourth end of the second screening section 420, respectively. Further, a first elastic element, which is a torsion spring, is provided between the first cantilever arm 210 and its corresponding first rotating rod 220. The first elastic element is in a compressed state in the initial state. A second elastic element, which is a torsion spring, is provided between the second cantilever arm 230 and its corresponding second rotating rod 240. The second elastic element 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.

[0027] Specifically, each set of first cantilever 210 includes two first arms, each first arm being rotatably connected to a first rotating rod 220, and each set of second cantilever 230 includes two second arms, each second arm being rotatably connected to a second rotating rod 240.

[0028] By providing a first elastic element between the first cantilever 210 and its corresponding first rotating rod 220, and a second elastic element between the second cantilever 230 and its 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 torque of its corresponding first elastic element. 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 torque of its corresponding second elastic element. In other words, 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 deviation is not large, or there is no material deviation, the first screening section 410 and the second screening section 420 are both on the same horizontal plane as the fixed screen 300 and are not guided.

[0029] In this embodiment, the movable screen 400 also includes a connecting screen plate 430, which is quadrilateral, specifically rhomboid. An elastic band 440 is fixedly connected to the connecting screen plate 430. The elastic band 440 is a rubber band and is evenly distributed on the four sides of the connecting screen plate 430. The elastic band 440 is fixedly connected to the fixed screen 300 and is on the same horizontal plane as the fixed screen 300.

[0030] The first screening section 410 includes a first screen plate 411 and a second screen plate 412. The first screen plate 411 is located on the side of the second screen plate 412 closer to the feed end 201, that is, the first screen plate 411 is located at the first end of the first screening section 410, and the second screen plate 412 is located at the second end of the first screening section 410. The first screen plate 411 and the second screen plate 412 are connected by a first connector, which enables the second screen plate 412 to move with the first screen plate 411.

[0031] The second screening section 420 includes a third screen plate 421 and a fourth screen plate 422. The third screen plate 421 is located on the side of the fourth screen plate 422 closer to the feed end 201, that is, the third screen plate 421 is at the third end of the second screening section 420, and the fourth screen plate 422 is at the fourth end of the second screening section 420. The third screen plate 421 and the fourth screen plate 422 are connected by a second connector, which enables the fourth screen plate 422 to move with the third screen plate 421.

[0032] The first mesh plate 411, the second mesh plate 412, the third mesh plate 421, and the fourth mesh plate 422 are all trapezoidal. The 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 rotatably connected to the first mesh plate 411 and the second mesh plate 412, respectively, and two second rotating rods 240 are rotatably connected to the third mesh plate 421 and the fourth mesh plate 422, respectively.

[0033] By setting up a connecting mesh plate 430, and connecting the first mesh plate 411 and the second mesh plate 412, and connecting the third mesh plate 421 and the fourth mesh plate 422, the first screening section 410 and the second screening section 420, which are arranged in a cross manner, can be guided independently.

[0034] 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 segment and two second rod segments. The first rod segment and the two second rod segments are integrally formed. The first rod segment is arranged along the arrangement direction of the first mesh plate 411, and the second rod segment is arranged in the vertical direction. The two second rod segments are respectively fixedly connected to both ends of the first rod segment. The first connecting rod 450 and the second connecting rod have the same structure, and the vertical dimension of the two second rod segments of the first connecting rod 450 is smaller than the vertical dimension of the two second rod segments of the second connecting rod.

[0035] By setting the vertical dimensions of the two second segments of the first connecting rod 450 to be smaller than those of the two second segments of the second connecting rod, when the first connecting rod 450 wobbles, it will not interfere with the second connecting rod. Similarly, when the second connecting rod wobbles, it will not interfere with the first connecting rod 450.

[0036] In this embodiment, a first stop bar is provided at the first rotating rod 220 connected to the second mesh plate 412 and the first cantilever 210 rotatably connected to the first rotating rod 220. The first stop bar is arranged parallel to the first rotating rod 220, that is, the first stop bar is located at the rotatable connection between the first rotating rod 220 and the first cantilever 210. The first stop bar is used to limit the increase of the included angle between the first cantilever 210 and the first rotating rod 220 rotatably connected to the first cantilever 210.

[0037] A second stop is provided at the second rotating rod 240 connected to the fourth mesh plate 422 and at the second cantilever 230 rotatably connected to the second rotating rod 240. The second stop is arranged parallel to the corresponding second rotating rod 240. That is, the second stop is located at the rotatable connection between the second rotating rod 240 and the second cantilever 230. The second stop is used to limit the increase of the included angle between the second cantilever 230 and the second rotating rod 240 rotatably connected to the second cantilever 230.

[0038] In this embodiment, by setting a first stop and a second stop, when the first screen plate 411 senses the material, it can prevent the second screen plate 412 from being deflected by the force of the material after flowing onto it. This would prevent 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 from increasing. The angle at this point can only decrease, not increase, thus ensuring that during guidance, only the first screen plate 411 can relatively descend, while the second screen plate 412 can only relatively rise. In other words, during guidance, within the first screening section 410, the guidance from the first screen plate 411 to the second screen plate 412 is unidirectional. This setting prevents the material from flowing back to the first screen plate 411 if the second screen plate 412 senses it simultaneously after flowing from the first screen plate 411, causing inaccurate sensing. The setting of the second stop is similar and will not be described further here.

[0039] In this embodiment, the fixed screen 300 has four mounting openings. A first side plate is provided on the side of each of the four mounting openings near the feed end 201 and the side near the discharge end 202. The first side plate faces 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. A second side plate 460 is provided on the side of each of the four screen plates 411, 412, 421, and 422 near the feed end 201 and the side near the discharge end 202. The second side plate 460 faces the frame 100 in the vertical direction.

[0040] By setting the first side plate and the second side plate 460, the sealing 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 port can be guaranteed, so as to prevent material leakage when the material is biased to one side, causing the first screen plate 411 to fall and the second screen plate 412 to rise (the first screening section 410 is tilted as a whole) or the third screen plate 421 to fall and the fourth screen plate 422 to rise (the second screening section 420 is tilted as a whole). When the first screening section 410 or the second screening section 420 is tilted as a whole, the tilted 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.

[0041] Based on the above embodiments, the specific working process is as follows: During use, the material enters the screen from the feed end 201. When the material is on the fixed screen 300, it will be screened by the machine body 200. When the material is on the movable screen 400...

[0042] 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 torque of the first elastic element. Therefore, the material will not be able to cause the first screen plate 411 to descend. At this time, the first screening section 410 and the second screening section 420 are both on the same horizontal plane as the fixed screen 300 and are not guided.

[0043] When the weight of the material on the first screen section 410 near the first end exceeds a first preset value, it will cause the first screen plate 411 to descend. See the appendix for details. Figure 4 and attached Figure 5 The left side is the second screen plate 412, and the right side is the first screen plate 411. When the first screen plate 411 descends, it will cause the first rotating rod 220 connected to it to swing, and cause the first elastic element corresponding to it to release its stored force, so that the included angle between the first rotating rod 220 and the first cantilever 210 corresponding to it increases. Then, through the first connecting rod 450, it will drive the second screen plate 412 to move upward, so that the first screening section 410 is tilted as a whole. When the second screen plate 412 rotates and rises, it will cause the first rotating rod 220 connected to it to swing, and cause the first elastic element corresponding to it to rotate and store force, so that the included angle between the first rotating rod 220 and the first cantilever 210 corresponding to it decreases.

[0044] See Figure 1 As shown, since the entire machine body 200 is inclined on the frame 100, the material tends to move from the feed end 201 side to the discharge end 202 side.

[0045] Therefore, when the first screening section 410 tilts as a whole, the first screen plate 411 will tilt relative to the fixed screen 300. That is, the first screen plate 411 is concave relative to the plane of the fixed screen 300, and the second screen plate 412 is convex relative to the plane of the fixed screen 300. When the material passes over the first screen plate 411, it will be blocked by the first side plate on the mounting opening. Guided by the inclined surface of the first side plate (because the first screen plate 411 itself is tilted, the mounting opening is tilted, and the first side plate is tilted), it will move towards the second screen plate 412 after passing through the connecting screen plate 430. After the weight of the material on the first screen plate 411 is less than or equal to the first preset value again, the first elastic element will twist and reset. The guiding principle of the second screening section 420 is the same as that of the first screening section 410, and will not be described again here.

[0046] It should be noted that during this process, as the first screen plate 411 descends, it causes the second screen plate 412 to rise. Therefore, the elastic bands 440 between the first screen plate 411 and the connecting screen plate 430, as well as between the second screen plate 412 and the connecting screen plate 430, will both deform. However, the degree of deformation is not significant, so the resistance of the elastic bands 440 is negligible. Simultaneously, as the first screen plate 411 descends and the second screen plate 412 rises, the entire first screening section 410 will tilt. This will cause a guiding force from the second screen plate 412 towards the first screen plate 411 when the material moves to the surfaces of the first screen plate 411 and the second screen 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 a brief stay on the surfaces of the first screen plate 411 and the second screen plate 412, this guiding effect is negligible and has a small impact throughout the guiding process.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should 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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