Coal fine vibration screening device

Abstract

The invention relates to the technical field of screening, in particular to a coal fine vibration screening device which comprises a rack, a vibration screening plate is arranged on the rack, the vibration screening plate is obliquely arranged and used for screening materials, a vibration assembly is further arranged on the rack and drives the vibration screening plate to vibrate, and the vibration screening plate is provided with a first screening plate and a second screening plate. The first screen plate and the second screen plate are located on the same plane with the vibrating screen plate, and the first screen plate and the second screen plate can sense material distribution on the two sides of the vibrating screen plate, so that distribution of materials on the vibrating screen plate is adjusted, the materials are gradually and evenly distributed, and the vibrating screen plate evenly screens the materials.

Description

Technical Field

[0001] The invention relates to the technical field of screening, in particular to a fine vibration screening device for coal. Background Art

[0002] Vibrating screen plate is a kind of equipment used for screening, filtering or separating particulate materials. Its working principle is to use vibration force to screen the material on the screen. Vibrating screen plate is widely used in mining, building materials, chemical, food, medicine and other industries for screening, filtering, grading and separation of particulate materials.

[0003] For example, Chinese patent CN111744777A discloses a vibrating screen plate, which screens materials by setting up an inclined screening box and a buffer. The material falls on the screen and rolls downward at the same time, so that the upper and lower layers of the material can be screened by the screen, thereby achieving the function of uniform screening of the material.

[0004] However, when the material falls on the screen and rolls, it may be unevenly distributed on the screen. For example, if there is more material on the left or right side, there will be more material on that side, and the screening effect will be much worse than that on the other side with less material distributed, resulting in uneven screening of the material. Summary of the invention

[0005] Based on this, it is necessary to provide a coal fine vibration screening device to address the current problem of uneven material screening.

[0006] The above purpose is achieved through the following technical solutions: A coal fine vibration screening device, comprising: A frame, wherein a vibrating screen plate is arranged on the frame, wherein the vibrating screen plate is arranged obliquely, and the material falls on the vibrating screen plate and rolls under the action of gravity; A vibration assembly, wherein the vibration assembly is located on the frame, the vibration assembly drives the frame to vibrate so as to drive the vibration screen plate to vibrate, and the vibration screen plate vibrates to screen the material; The vibrating screen plate comprises a first screen plate and a second screen plate, the first screen plate and the second screen plate are both in the same plane as the vibrating screen plate, the first screen plate and the second screen plate are arranged obliquely along the rolling direction of the material, and the first screen plate and the second screen plate are arranged symmetrically about a line connecting the midpoints of the distance between the first screen plate and the second screen plate, and the angle between the first screen plate and the second screen plate is an acute angle; The first sieve plate and the second sieve plate can respectively sense the amount of material on both sides of the vibrating sieve plate. The first sieve plate and the second sieve plate are configured so that when the materials on both sides of the vibrating sieve plate are different, the first sieve plate or the second sieve plate adjusts the materials on both sides to be the same.

[0007] Furthermore, both ends of the first screen plate and the second screen plate are hinged to the vibrating screen plate, and both ends of the first screen plate and the second screen plate can move in a direction perpendicular to the surface of the vibrating screen plate. When the first screen plate has more material on one end on the front side of the material conveying direction than on the other side, this side moves downward to tilt the first screen plate, and the first screen plate diverts the material on this side to the other side; when the second screen plate has more material on one end on the front side of the material conveying direction than on the other side, this side moves downward to tilt the second screen plate, and the second screen plate diverts the material on this side to the other side.

[0008] Furthermore, hinge assemblies are provided on both sides of the frame, and the hinge assemblies are used to hinge the first sieve plate and the second sieve plate to the frame. The hinge assembly includes a first hinge rod and a second hinge rod, one end of the first hinge rod is vertically arranged on the frame, the other end of the first hinge rod is hinged to one end of the second hinge rod, and a torsion spring is connected therebetween, the other end of the second hinge rod is hinged to the first sieve plate or the second sieve plate, the angle between the first hinge rod and the second hinge rod is an acute angle, and the angle between the second hinge rod and the first sieve plate or the second sieve plate is an obtuse angle.

[0009] Furthermore, a torsion spring coefficient between the first hinged rod and the second hinged rod at one end of the first screen plate and the second screen plate on the front side of the material conveying direction is greater than a torsion spring coefficient between the first hinged rod and the second hinged rod at one end of the second screen plate on the rear side of the material conveying direction.

[0010] Furthermore, a locking assembly is provided on one end of the first screen plate and the second screen plate on the rear side in the material conveying direction, and the locking assembly is used to limit the rotation direction of the first hinge rod and the second hinge rod.

[0011] Furthermore, the locking assembly includes a locking block, and the locking block is located between the first hinged rod and the second hinged rod, and the locking block limits the increase of the angle between the first hinged rod and the second hinged rod.

[0012] Furthermore, the vibration assembly includes an eccentric vibrator symmetrically arranged on the frame and a rotating shaft rotatably arranged on the frame, the eccentric vibrator is fixedly arranged on the rotating shaft, and the rotation of the rotating shaft drives the eccentric vibrator to rotate.

[0013] Furthermore, a driving assembly is provided on the frame, and the driving assembly includes a driving motor, and the driving motor is connected to the rotating shaft, and the driving motor drives the rotating shaft to rotate.

[0014] Furthermore, a support frame is provided below the rack, and the support frame is used to support the rack.

[0015] Furthermore, a support rod is provided between the support frame and the frame, and the support rod is retractable.

[0016] The beneficial effects of the present invention are: The present invention arranges a first sieve plate and a second sieve plate, and the first sieve plate and the second sieve plate can sense the distribution of materials on both sides of the vibrating sieve plate, thereby adjusting the distribution of materials on the vibrating sieve plate, making the materials gradually evenly distributed, so that the vibrating sieve plate can evenly screen the materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a coal fine vibration screening device provided in one embodiment of the present invention; Figure 2 for Figure 1 A front view of a coal fine vibration screening device provided in an embodiment; Figure 3 for Figure 1 A top view of a coal fine vibration screening device provided in one embodiment; Figure 4 for Figure 3 A cross-sectional view of a coal fine vibration screening device along AA provided in an embodiment; Figure 5 A schematic structural diagram of a coal fine vibration screening device from another angle provided in one embodiment of the present invention.

[0018] in: 100, frame; 110, support frame; 120, support rod; 200, vibrating screen plate; 210, first screen plate; 220, second screen plate; 300, hinge assembly; 310, first hinge rod; 320, second hinge rod; 400, vibration assembly; 410, eccentric vibrator; 420, rotating shaft; 430, driving motor. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0021] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0022] Refer to the following Figure 1-Figure 5 To describe a coal fine vibration screening device provided in this application.

[0023] A fine vibration screening device for coal is suitable for vibration screening of materials, especially for fine screening of coal, comprising a frame 100, on which a vibration screen plate 200 is arranged, on which a plurality of screen holes (not shown in the figure) are opened, and the vibration screen plate 200 is arranged obliquely, that is, there is an angle between the vibration screen plate 200 and the horizontal plane, so that the material falling on the vibration screen plate 200 rolls on the vibration screen plate 200 under the action of gravity, and the frame 100 is also provided with a vibration component 400, which drives the frame 100 to vibrate when the vibration component 400 vibrates, so that the frame 100 drives the vibration screen plate 200 to vibrate, and the material rolls and vibrates on the vibration screen plate 200 to achieve material screening. Since the sizes of the materials to be screened are uneven, the distribution of the materials on the vibrating screen plate 200 is not uniform, resulting in different screening effects for the materials on both sides of the vibrating screen plate 200. The screening effect on the side with more materials is poor, while the screening effect on the side with less materials is significantly better than that on the side with more materials.

[0024] Therefore, in order to solve the above problems, the vibrating screen plate 200 of the present application has a first screen plate 210 and a second screen plate 220, both of which are movable screen plates, while the other parts of the vibrating screen plate 200 are fixed screen plates, which are fixed on the frame 100 and cannot move. The first screen plate 210 and the second screen plate 220 are in the same plane as the vibrating screen plate 200, as shown in FIG. Figure 1 and Figure 3 As shown, the first sieve plate 210 and the second sieve plate 220 are arranged along the conveying direction of the material (the conveying direction of the material is Figure 3 The first sieve plate 210 and the second sieve plate 220 are arranged tilted (in the direction from right to left in the middle), and the first sieve plate 210 and the second sieve plate 220 are arranged symmetrically about the midpoint line of the distance between the two, and the angle formed between the first sieve plate 210 and the second sieve plate 220 is an acute angle. The first sieve plate 210 and the second sieve plate 220 can sense the amount of material on both sides of the vibrating sieve plate 200, that is, when the material passes through the first sieve plate 210 or the second sieve plate 220, the first sieve plate 210 and the second sieve plate 220 can sense the amount of material passing through, thereby judging the amount of material.

[0025] For example, Figure 2 As shown, the conveying direction of the material is from right to left. If the material falls on the vibrating screen plate 200 and the material on the lower side is more than that on the upper side, when the material passes through the first screen plate 210, the weight of the material on the lower side of the first screen plate 210 is greater than the weight of the material on the upper side. At this time, the first screen plate 210 begins to adjust the distribution of the material, that is, the lower side of the first screen plate 210 moves downward in a direction perpendicular to the surface of the vibrating screen plate 200, and the upper side of the first screen plate 210 moves upward so that the right side of the first screen plate 210 is convex, thereby playing a role in guiding the material upward, that is, the material subsequently passing through the first screen plate 210 will gradually move in the direction with less material on the upper side under the drainage effect of the first screen plate 210, so that The materials on the upper and lower sides gradually become evenly distributed; if the material falling on the upper side of the vibrating screen plate 200 is more than the material on the lower side, when the material passes through the second screen plate 220, the weight of the material on the upper side of the second screen plate 220 is greater than the weight of the material on the lower side, so that the upper side of the second screen plate 220 moves downward in a direction perpendicular to the surface of the vibrating screen plate 200, and the lower side of the second screen plate 220 moves upward, so that the right side of the second screen plate 220 bulges, thereby playing a role in guiding the material downward, that is, the subsequent material gradually moves to the side with less material on the lower side under the guidance of the second screen plate 220, so that the material is gradually evenly distributed, so that the vibrating screen plate 200 can screen the material evenly.

[0026] Specifically, in this embodiment, hinge assemblies 300 are provided on both sides of the frame 100, and the hinge assemblies 300 are used to hinge the two ends of the first sieve plate 210 and the second sieve plate 220 so as to realize the function of moving the first sieve plate 210 and the second sieve plate 220. The hinge assembly 300 includes a first hinge rod 310 and a second hinge rod 320, such as Figure 4 As shown, one end of the first hinge rod 310 is vertically arranged on both sides of the frame 100, and the other end of the first hinge rod 310 is hinged to one end of the second hinge rod 320. A torsion spring (not shown in the figure) is arranged between the first hinge rod 310 and the second hinge rod 320. One end of the second hinge rod 320 is hinged to both ends of the first sieve plate 210 or the second sieve plate 220. The angle between the first hinge rod 310 and the second hinge rod 320 is an acute angle, and the second hinge rod 320 and the first sieve plate 210 or the second sieve plate The angle between the first sieve plate 210 and the second sieve plate 220 is an obtuse angle. The first sieve plate 210 and the second sieve plate 220 maintain the above state under the action of the torsion spring. When the material passing through the first sieve plate 210 or the second sieve plate 220 is uneven, that is, when there is more material on one side, the weight of the material can overcome the force of the torsion spring and press down the first sieve plate 210 or the second sieve plate 220, so that the first sieve plate 210 or the second sieve plate 220 is tilted. Since both ends of the first sieve plate 210 and the second sieve plate 220 are hinged to the second hinge rod 320, Figure 4 For example, Figure 4 The middle is a cross-sectional view of the second screen plate 220. If the material on the right side is more than the material on the left side, the right side of the second screen plate 220 is pressed down, and the left side moves to the right, so that the height of the left side is higher than the height of the right side. Figure 3 From the top view shown, it is known that the left side height of the second screen plate 220 is higher than the right side height, and the inclined angle formed can guide the subsequent more right side materials to the less left side materials, thereby playing a role in adjusting the material distribution on the vibrating screen plate 200. Similarly, the first screen plate 210 is also the same, which will not be repeated here.

[0027] In a further embodiment, Figure 3 As shown, the elastic coefficient of the torsion spring between the first hinge rod 310 and the second hinge rod 320 at the end of the first sieve plate 210 and the second sieve plate 220 on the front side in the material conveying direction is greater than the elastic coefficient of the torsion spring between the first hinge rod 310 and the second hinge rod 320 at the end on the rear side in the material conveying direction. That is, the elastic coefficient of the torsion spring at the lower end of the first sieve plate 210 is greater than the elastic coefficient of the torsion spring at the upper end, and the elastic coefficient of the torsion spring at the upper end of the second sieve plate 220 is greater than the elastic coefficient of the torsion spring at the lower end.

[0028] It should be noted that Figure 3As shown, the above arrangement is to adapt to the inclination of the first sieve plate 210 and the second sieve plate 220, resulting in the material first rolling to the lower end of the first sieve plate 210 or the upper end of the second sieve plate 220. In the direction of material conveying, that is, from the right to the left, during the screening process, the material on the right will be slightly more than the material on the left. This is because the material on the left is screened for a slightly longer time than the screening time on the right, so the material on the right will be slightly more than the material on the left. Then the slightly more material on the right will affect the weight judgment of the first sieve plate 210 and the second sieve plate 220 on the material, that is, under the premise of uniform distribution of the material, the material first contacted by the lower side of the first sieve plate 210 and the upper side of the second sieve plate 220 will be more than the upper side of the first sieve plate 210 and the lower side of the second sieve plate 220. Therefore, in order to balance the excess material, the elastic coefficient of the torsion spring at the lower side of the first sieve plate 210 and the upper side of the second sieve plate 220 is set to be larger, that is, the elastic coefficient of the torsion spring at this location is greater than the elastic coefficient of the torsion spring at the upper side of the first sieve plate 210 and the lower side of the second sieve plate 220. This avoids the situation where the first screen plate 210 and the second screen plate 220 are affected in adjusting the distribution of materials on the screening plates due to the fact that there is more material on the right side of the vibrating screen plate 200 than on the left side.

[0029] In a further embodiment, Figure 3 As shown, in order to make the first screen plate 210 only used to adjust the material distribution on the upper side of the vibrating screen plate 200, and the second screen plate 220 only used to adjust the material distribution on the lower side of the vibrating screen plate 200, the first screen plate 210 and the second screen plate 220 are provided with a locking assembly at one end of the rear side of the material conveying direction, and the locking assembly is specifically used to limit the rotation direction of the second hinge rod 320 at the upper end of the first screen plate 210 and the lower end of the second screen plate 220. Figure 4 As shown, the locking assembly is used to limit the lower end of the second screen plate 220, that is, Figure 4 The leftward rotation of the second hinged rod 320 on the left side of the second screen plate 220 limits Figure 4 The angle between the second hinge rod 320 on the left side of the second screen plate 220 and the first hinge rod 310 increases, so that the second screen plate 220 is only used to sense that there are more materials on the right side and guide the more materials on the right side to move in the direction of less materials on the left side. Similarly, the locking assembly is used to limit the rightward rotation of the second hinge rod 320 on the right side of the first screen plate 210, so that the first screen plate 210 is only used to sense that there are more materials on the left side and guide the more materials on the left side to move in the direction of less materials on the right side, so that the first screen plate 210 and the second screen plate 220 work independently without affecting each other, thereby improving the accuracy of the first screen plate 210 and the second screen plate 220 in adjusting the material distribution.

[0030] Specifically, the locking assembly includes a locking block (not shown in the figure), which is disposed at the hinge position of the first hinge rod 310 and the second hinge rod 320, so as to limit the increase of the angle between the first hinge rod 310 and the second hinge rod 320.

[0031] It should be noted that the locking assembly is not limited to the above structure, but can also be a block disposed on both sides of the frame 100, thereby limiting the rotation direction of the first hinge rod 310 and the second hinge rod 320. Of course, other structures are also possible, which are not specifically limited here.

[0032] Specifically, the vibration assembly 400 includes an eccentric vibrator 410 and a rotating shaft 420. The rotating shaft 420 is rotatably set on the frame 100, and the eccentric vibrator 410 is fixedly set on the rotating shaft 420. The rotation of the rotating shaft 420 drives the eccentric vibrator 410 to rotate. Since the fixed position of the eccentric vibrator 410 is eccentrically fixed on the rotating shaft 420, the eccentric vibrator 410 can make the frame 100 vibrate during rotation, thereby driving the vibration screen plate 200 to vibrate.

[0033] In a further embodiment, a driving assembly is disposed on the frame 100, and the driving assembly is used to drive the two rotating shafts 420 to rotate. The driving assembly includes two driving motors 430, and the two driving motors 430 drive the two rotating shafts 420 respectively, and the rotation directions are opposite.

[0034] Specifically, a support frame 110 is disposed at the bottom of the frame 100 , and the support frame 110 is used to support the frame 100 .

[0035] Specifically, a plurality of support rods 120 are provided between the support frame 110 and the frame 100 , and both ends of the support rods 120 are universally connected to the frame 100 and the support frame 110 . The support rods 120 are hydraulic cantilevers, so that the vibration of the vibrating screen is more stable.

[0036] The specific working process of a coal fine vibration screening device provided by the present application is described in combination with the above embodiments: Starter: The driving motor 430 is turned on, and the driving motor 430 drives the rotating shaft 420 to rotate, and the rotating shaft 420 drives the eccentric vibrator 410 to rotate so that the vibration screen plate 200 starts to vibrate.

[0037] Normal screening: The material falls on the vibrating screen plate 200 and is evenly distributed on the vibrating screen plate 200. The material rolls on the vibrating screen plate 200 under the action of its own gravity and is screened on the vibrating screen plate 200 under the action of the exciting force. Since the material is evenly distributed on the vibrating screen plate 200, the vibrating screen plate 200 screens the material evenly.

[0038] Uneven material: When the material is unevenly distributed on the vibrating screen plate 200, for example Figure 3As shown, if the material is distributed more on the lower side than on the upper side, when the material passes through the first screen plate 210, more material will overcome the force of the torsion spring between the first hinge rod 310 and the second hinge rod 320 at the lower side of the first screen plate 210, so that the lower side of the first screen plate 210 moves downward in a direction perpendicular to the surface of the vibrating screen plate 200, and the upper side of the first screen plate 210 moves upward, so that the right side of the first screen plate 210 bulges to guide the material to the upper side, thereby gradually guiding the subsequent material to the upper side. This process is a step-by-step process. When there is more material on the upper side, the guiding effect of the first screen plate 210 will be weaker, until the materials on the upper and lower sides are even, the first screen plate 210 is Plate 210 is reset, thereby completing the adjustment of material distribution; similarly, if the material is distributed more on the upper side than on the lower side, when the material passes through the second screen plate 220, more material will overcome the force of the torsion spring between the first hinge rod 310 and the second hinge rod 320 on the upper side of the second screen plate 220, so that the upper side of the second screen plate 220 moves downward in a direction perpendicular to the surface of the vibrating screen plate 200, while the lower side of the second screen plate 220 moves upward, so that the right side of the second screen plate 220 bulges to guide the material to the downward side, and then the subsequent material is gradually guided to the downward side, until the materials on the upper and lower sides are uniform, the second screen plate 220 is reset, thereby completing the adjustment of material distribution.

[0039] Through the adjustment of the first screen plate 210 or the second screen plate 220 , the material is evenly distributed on the vibrating screen plate 200 , thereby avoiding excessive accumulation of material on one side of the vibration, and further making the screening of the vibrating screen plate 200 more uniform.

[0040] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A coal fine vibration screening device, characterized in that: include: A frame, wherein a vibrating screen plate is arranged on the frame, wherein the vibrating screen plate is arranged obliquely, and the material falls on the vibrating screen plate and rolls under the action of gravity; A vibration assembly, wherein the vibration assembly is located on the frame, the vibration assembly drives the frame to vibrate so as to drive the vibration screen plate to vibrate, and the vibration screen plate vibrates to screen the material; The vibrating screen plate comprises a first screen plate and a second screen plate, the first screen plate and the second screen plate are both in the same plane as the vibrating screen plate, the first screen plate and the second screen plate are arranged obliquely along the rolling direction of the material, and the first screen plate and the second screen plate are arranged symmetrically about a line connecting the midpoints of the distance between the first screen plate and the second screen plate, and the angle between the first screen plate and the second screen plate is an acute angle; The first sieve plate and the second sieve plate can respectively sense the amount of material on both sides of the vibrating sieve plate. The first sieve plate and the second sieve plate are configured so that when the materials on both sides of the vibrating sieve plate are different, the first sieve plate or the second sieve plate adjusts the materials on both sides to be the same.

2. The coal fine vibration screening device according to claim 1, characterized in that: Both ends of the first screen plate and the second screen plate are hinged to the vibrating screen plate, and both ends of the first screen plate and the second screen plate can move in a direction perpendicular to the surface of the vibrating screen plate. When the first screen plate has more material on one end on the front side of the material conveying direction than on the other side, this side moves downward to tilt the first screen plate, and the first screen plate diverts the material on this side to the other side; when the second screen plate has more material on one end on the front side of the material conveying direction than on the other side, this side moves downward to tilt the second screen plate, and the second screen plate diverts the material on this side to the other side.

3. The coal fine vibration screening device according to claim 2, characterized in that: Hinge assemblies are provided on both sides of the frame, and the hinge assemblies are used to hinge the first sieve plate and the second sieve plate to the frame. The hinge assembly includes a first hinge rod and a second hinge rod, one end of the first hinge rod is vertically arranged on the frame, the other end of the first hinge rod is hinged to one end of the second hinge rod, and a torsion spring is connected therebetween, the other end of the second hinge rod is hinged to the first sieve plate or the second sieve plate, the angle between the first hinge rod and the second hinge rod is an acute angle, and the angle between the second hinge rod and the first sieve plate or the second sieve plate is an obtuse angle.

4. The coal fine vibration screening device according to claim 3, characterized in that: The torsion spring coefficient between the first hinge rod and the second hinge rod at one end of the first screen plate and the second screen plate on the front side of the material conveying direction is greater than the torsion spring coefficient between the first hinge rod and the second hinge rod at one end of the rear side of the material conveying direction.

5. The coal fine vibration screening device according to claim 4, characterized in that: The first screen plate and the second screen plate are provided with a locking assembly at one end on the rear side of the material conveying direction, and the locking assembly is used to limit the rotation direction of the first hinge rod and the second hinge rod.

6. The coal fine vibration screening device according to claim 5, characterized in that: The locking assembly comprises a locking block, wherein the locking block is located between the first hinge rod and the second hinge rod, and the locking block limits the increase of the angle between the first hinge rod and the second hinge rod.

7. The coal fine vibration screening device according to claim 1, characterized in that: The vibration assembly comprises an eccentric vibrator symmetrically arranged on the frame and a rotating shaft rotatably arranged on the frame, the eccentric vibrator is fixedly arranged on the rotating shaft, and the rotation of the rotating shaft drives the eccentric vibrator to rotate.

8. The coal fine vibration screening device according to claim 7, characterized in that: The frame is provided with a driving assembly, which includes a driving motor connected to the rotating shaft, and the driving motor drives the rotating shaft to rotate.

9. The coal fine vibration screening device according to claim 1, characterized in that: A support frame is arranged below the frame, and the support frame is used to support the frame.

10. The coal fine vibration screening device according to claim 9, characterized in that: A support rod is arranged between the support frame and the frame, and the support rod can be extended and retracted.

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