Screen with novel beating mode and screening device

Abstract

The invention relates to the technical field of material grading equipment, in particular to a screen with a novel beating mode and a screening device. The screen with the novel beating mode comprises a screen assembly and a beating assembly. The screen assembly comprises a first screen frame and a flexible screen arranged in the first screen frame. The beating assembly is arranged below the screen assembly and comprises a plate spring and a beating tool bit. One end of the plate spring is fixedly arranged and the other end is provided with a striking cutter head; a plurality of adjusting holes are formed in the surface of the plate spring to adjust the inherent frequency of the plate spring; when the screen assembly vibrates, the plate spring vibrates along with the screen assembly, so that the beating tool bit can repeatedly beat the flexible screen. Due to the fact that the flexible screen has the characteristic of flexibility, under repeated knocking of the striking tool bit, the flexible screen can generate extra vibration besides vibration under the action of external force, then materials attached to the flexible screen are separated from the flexible screen, screen holes of the flexible screen are prevented from being blocked, and the screening efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of material grading equipment, and in particular to a screen with a novel striking method and a screening device. Background Art

[0002] Vibrating screen is a common equipment for screening and grading fine-grained materials, and is widely used in the coal mining industry. The string screen is a commonly used type of vibrating screen, and its main components include an exciter and a screen mechanism. The screen mechanism consists of a first screen frame and a screen installed therein. The screen uses multiple rigid steel wires arranged horizontally, vertically, or horizontally and vertically. During operation, the exciter drives the screen mechanism to vibrate, causing the material to move on the screen. Smaller particles pass through the screen pores, while larger particles are retained on the screen surface, thereby completing the efficient grading of the material. However, when dealing with wet and sticky materials, the material is easy to adhere to the steel wire, causing the screen holes to be blocked, seriously affecting the screening efficiency. Summary of the invention

[0003] (I) The problem to be solved by the present invention is that when the existing string screen processes wet and sticky materials, the materials easily adhere to the screen, causing the screen holes to be blocked, thereby affecting the screening efficiency.

[0004] (II) Technical solution In order to solve the above technical problems, an embodiment of the present invention provides a screen with a new striking method, including: a screen assembly and a striking assembly; The screen assembly comprises a first screen frame and a flexible screen disposed in the first screen frame; The striking assembly is arranged below the screen assembly, and the striking assembly comprises a leaf spring and a striking blade head; one end of the leaf spring is fixedly arranged, and the other end is provided with the striking blade head; a plurality of adjustment holes are provided on the surface of the leaf spring to adjust the natural frequency of the leaf spring; When the screen assembly vibrates, the leaf spring vibrates along with the screen assembly, so that the striking blade head can repeatedly strike the flexible screen.

[0005] Furthermore, the striking blade head is located below the middle position of the flexible screen.

[0006] Furthermore, the striking assembly also includes two groups of splint sets; The leaf spring is arranged between the two groups of the clamping plate groups, and the clamping plate groups are fixed on the first screen frame through fixing members.

[0007] Furthermore, the striking components are provided in multiple groups; all of the striking components are arranged in sequence along the edge of the first screen frame.

[0008] Furthermore, the screen assembly also includes a reinforcement member; The reinforcement is arranged in the first screen frame, and the two ends of the reinforcement are respectively connected to the first screen frame; the striking blade head is provided with avoidance grooves corresponding to the reinforcements one by one; when the striking blade head strikes the flexible screen, the reinforcement is located in the corresponding avoidance groove.

[0009] Another embodiment of the present invention further provides a screening device, including a device frame, a vibration source and the above-mentioned screen with a novel striking method; The screen with a novel striking method is fixedly arranged in the equipment frame; the vibration source is transmission-connected to the equipment frame and is used to drive the equipment frame to vibrate.

[0010] Furthermore, the vibration frequency of the vibration source during operation is a; the natural frequency of the leaf spring is b, wherein: a<b<1.05×a.

[0011] Furthermore, after the leaf spring is provided with an adjustment hole, the equivalent mass of the striking assembly is m, where: ; Where n is the number of leaf springs; E is the elastic modulus of the leaf spring; x is the width of the leaf spring; t is the thickness of the leaf spring; l is the length of the leaf spring.

[0012] Furthermore, the striking assembly also includes a connecting member; The connecting member is arranged below the clamping plate group located below, the connecting member and the two clamping plate groups are fixed on the first screen frame through fixing members, and the connecting member is also connected to the equipment frame at the same time.

[0013] Further, a hard screen assembly is also included; The rigid screen assembly is fixedly arranged in the equipment frame and is located above the screen assembly with the novel striking method.

[0014] Beneficial effects of the present invention: The present invention provides a screen with a new striking method, comprising: a screen assembly and a striking assembly; the screen assembly comprises a first screen frame and a flexible screen arranged in the first screen frame; the striking assembly is arranged below the screen assembly, and the striking assembly comprises a leaf spring and a striking cutter head; one end of the leaf spring is fixed, and the other end is provided with a striking cutter head; a plurality of adjustment holes are opened on the surface of the leaf spring to adjust the natural frequency of the leaf spring; when the screen assembly vibrates, the leaf spring vibrates with the screen assembly, so that the striking cutter head can repeatedly strike the flexible screen.

[0015] Due to the flexible nature of the flexible screen, it is allowed to be struck by external force without being damaged. Under the repeated striking of the striking cutter head, the flexible screen can generate additional vibrations in addition to the vibrations caused by the external force, thereby separating the material adhering to the flexible screen from the flexible screen, keeping the flexible screen clean at all times, avoiding blockage of the screen holes of the flexible screen, and improving the screening efficiency. At the same time, by opening an adjustment hole on the leaf spring, on the one hand, the adjustment hole can be used for material leakage to avoid the accumulation of materials on the leaf spring after passing through the flexible screen, and on the other hand, the natural frequency of the leaf spring can be adjusted so that the natural frequency of the leaf spring is close to the vibration frequency of the vibration source to form resonance, thereby bringing about a high vibration amplitude and improving the cleaning effect of the flexible screen. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 1 A schematic structural diagram of a screen provided by an embodiment of the present invention from one viewing angle; Figure 2 A schematic structural diagram of a screen provided by an embodiment of the present invention from another perspective; Figure 3 A schematic structural diagram of a screen provided by an embodiment of the present invention from a third viewing angle; Figure 4 for Figure 3 AA perspective cross-sectional view; Figure 5 A schematic diagram of the structure of a striking assembly provided by an embodiment of the present invention; Figure 6 A schematic structural diagram of a hard screen assembly provided in an embodiment of the present invention.

[0018] Icons: 1-screen assembly; 11-first screen frame; 12-flexible screen string; 13-reinforcement member; 2- striking assembly; 21- leaf spring; 211- adjusting hole; 22- striking cutter head; 221- avoidance groove; 23- clamping plate group; 231- clamping plate; 24- connecting piece; 4-hard screen mesh assembly; 41-second screen frame; 42-hard screen string. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0023] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0026] like Figures 1 to 5 As shown, an embodiment of the present invention provides a screen with a new striking method, and the screen with a new striking method includes a screen assembly 1 and a striking assembly 2. The screen assembly 1 includes a first screen frame 11 and a flexible screen with flexible characteristics; the flexible screen is fixedly arranged in the first screen frame 11; during use, the first screen frame 11 can be vibrated under the action of an external force, and then the flexible screen located in the first screen frame 11 can be vibrated, so that the flexible screen can hit the material located thereon, so that the sticky material can be broken up to pass through the sieve holes of the flexible screen, and the screening effect on wet sticky materials is obvious. The striking assembly 2 is arranged below the screen assembly 1, and includes a leaf spring 21 and a striking blade 22. One end of the leaf spring 21 is fixedly arranged, and the other end is fixedly provided with the striking blade 22 by a bolt or other structure. When the screen assembly 1 vibrates under the action of an external force, the leaf spring 21 can also vibrate with the screen assembly 1, thereby causing the striking blade 22 fixedly arranged at the end of the leaf spring 21 to swing, so that the striking blade 22 can repeatedly strike the flexible screen above. Preferably, the striking blade 22 can be made of polyurethane material, so as to provide a certain protection for the flexible screen. Preferably, a plurality of adjustment holes 211 are provided on the surface of the leaf spring 21. The adjustment holes 211 can be used for leaking materials to prevent materials from accumulating on the leaf spring 21 after passing through the flexible screen. More importantly, the adjustment holes 211 can also adjust the natural frequency of the leaf spring 21, so that the natural frequency of the leaf spring 21 is close to the vibration frequency of the vibration source so as to form resonance, thereby bringing about a high vibration amplitude and improving the cleaning effect of the flexible screen. The shape of the adjustment hole 211 is not limited, and can be any one or more of a square hole, a round hole, an elliptical hole, and a long strip hole.

[0027] The screen with a new striking method provided in this embodiment can be struck by external force without being damaged due to its flexible characteristics. Under the repeated striking of the striking blade 22, the flexible screen can generate additional vibrations in addition to the vibrations caused by the external force, thereby separating the material adhering to the flexible screen from the flexible screen, keeping the flexible screen clean at all times, avoiding blockage of the screen holes of the flexible screen, and improving the screening efficiency.

[0028] Optionally, in this embodiment, the screen with a new striking method is generally used in a screening device, and the screening device is provided with an exciter as a vibration source. Under the action of the exciter, the screen assembly 1 can vibrate when in use. Since the screen assembly 1 vibrates, the striking assembly 2 will also vibrate, so the fixed end of the leaf spring 21 can be fixedly set on the screening device and vibrate under the action of the screening device, or fixedly set on the first screen frame 11 and vibrate under the action of the screen assembly 1, or fixedly set on both the screening device and the first screen frame 11.

[0029] Optionally, in the present embodiment, the first screen frame 11 of the screen assembly 1 is generally a square structure having two pairs of mounting frames arranged opposite to each other, the flexible screen comprises a plurality of flexible screen strings 12, the flexible screen strings 12 may be steel wire ropes, all the flexible screen strings 12 are arranged horizontally, vertically or crosswise, and the two ends of the flexible screen strings 12 are respectively fixedly connected to the two mounting frames of the same pair.

[0030] In this embodiment, the striking component 2 adopts a leaf spring 21, which has a high structural strength. Compared with elastic parts such as torsion bar springs or coil springs, the vibration direction of the leaf spring 21 is easier to control, so that the striking blade head 22 can move in a preset direction to achieve the purpose of reciprocatingly striking the flexible screen.

[0031] During use of the above-mentioned screen with a new striking method, the deformation in the middle position of the flexible screen is the largest. Therefore, in this embodiment, the striking blade head 22 is preferably arranged below the middle position of the flexible screen. At this time, the striking effect of the striking blade head 22 is best, which helps to keep the surface of the flexible screen clean and avoid blockage of the sieve holes of the flexible screen. In other embodiments, the striking blade head 22 may also be disposed at the end of the flexible screen, which can also achieve the purpose of striking the flexible screen in this embodiment to prevent the sieve holes of the flexible screen from being blocked.

[0032] Optional, such as Figures 1 to 5 As shown, the striking assembly 2 also includes two groups of splint groups 23, each group of splint groups 23 includes at least one splint 231. When the splint group 23 includes multiple splints 231, the multiple splints 231 are stacked, and the length, width and thickness of each splint 231 can be the same or different. The two groups of splint groups 23 are respectively arranged on the upper and lower sides of the fixed end of the leaf spring 21, and the leaf spring 21 is clamped between the two groups of splint groups 23. Then, the leaf spring 21 and the two groups of splint groups 23 are fixed to the mounting frame of the first screen frame 11 by fixing parts such as rivets or screws. Specifically, the leaf spring 21 and the two groups of splint groups 23 are provided with one-to-one corresponding through holes, and the mounting frame is provided with corresponding connecting holes, and the fixing parts are connected to the connecting holes through the through holes in sequence.

[0033] Optionally, in the present embodiment, a plurality of mounting holes corresponding one to one with the flexible screen strings 12 are provided on the mounting frame of the first screen frame 11, and one end of the flexible screen string 12 is passed through the mounting hole and then locked and fixed by a lock. When the striking assembly 2 is installed on the mounting frame of the first screen frame 11, it may interfere with the installation of the flexible screen string 12. Therefore, as a preference, avoidance holes and other structures may be provided on the leaf spring 21 and the clamping plate group 23, so that the flexible screen string 12 passes through the mounting hole and then through the avoidance hole, and then the flexible screen string 12 is locked and fixed by the lock.

[0034] Preferably, in the present embodiment, the above-mentioned striking components 2 may be provided in multiple groups, and all striking components 2 are arranged in sequence along the edge of the first screen frame 11, so as to improve the striking effect on the flexible screen and prevent wet and sticky materials from sticking to the flexible screen and causing blockage of the screen holes.

[0035] Optional, such as Figure 2 and Figure 4 As shown, the screen assembly 1 also includes a reinforcement member 13, which is arranged in the first screen frame 11 and is used to improve the structural strength of the first screen frame 11. The reinforcement member 13 is a rod-shaped structure, and its two ends are respectively fixedly connected to the two mounting frames of the same pair. When the striking cutter head 22 strikes the flexible screen, there is interference between the reinforcement member 13 and the striking cutter head 22. For this reason, the striking cutter head 22 is provided with an avoidance groove 221 corresponding to the reinforcement member 13. When the striking cutter head 22 strikes the flexible screen, the reinforcement member 13 is located in the corresponding avoidance groove 221 to avoid interference between the reinforcement member 13 and the striking cutter head 22.

[0036] The screen with a novel striking method provided in this embodiment integrates the screen assembly 1 with the striking assembly 2, so that the screen with a novel striking method can be applied to a string screen, a linear screen or a banana screen, and has greater applicability.

[0037] Another embodiment of the present invention also provides a screening device, including an equipment frame, a vibration source, and a screen with a novel striking method in any of the above embodiments. The screen with a novel striking method is fixedly arranged in the equipment frame, and the vibration source is arranged on the equipment frame. During use, the vibration source drives the equipment frame to vibrate, thereby driving the screen with a novel striking method in the equipment frame to vibrate, so that the flexible screen vibrates, and can also drive the leaf spring 21 and the striking blade 22 on the leaf spring 21 to move, so that the striking blade 22 can knock the flexible screen to keep the surface of the flexible screen clean.

[0038] Optionally, the above-mentioned vibration source can be a vibrator, and the vibration frequency of the vibration source during operation is a, and the natural frequency of the leaf spring 21 itself is b. Preferably, a<b<1.05×a. In this embodiment, since a<b<1.05×a, b is close to a value, so that the vibration source can resonate with the leaf spring 21 after operation, which can bring high vibration amplitude and improve the cleaning effect on the flexible screen. At the same time, the high-intensity acceleration generated by the striking cutter head 22 can also make the amplitude of the flexible screen larger, improve the striking effect of the flexible screen on the material, and the material passes through the flexible screen faster. Moreover, when the vibration source is turned off, the leaf spring 21 of the striking component 2 can also stop vibrating quickly.

[0039] Furthermore, in this embodiment, the natural frequency of the leaf spring 21 is affected by stiffness and deflection, while the life span is affected by stress, specifically: ; Where k is the stiffness of the leaf spring; n is the number of leaf springs in the striking assembly. The striking assembly may be provided with only one leaf spring or may be provided with multiple leaf springs stacked in layers; E is the elastic modulus of the leaf spring; x is the width of the leaf spring; t is the thickness of the leaf spring; l is the length of the leaf spring; ; Where b is the natural frequency of the leaf spring; m is the equivalent mass of the striking component; According to the above formula, it can be concluded that after the material is selected, the natural frequency of the striking component 2 is related to the leaf spring 21, width, thickness and mass. The length and width of the leaf spring 21 are determined according to the size of the flexible screen. After the thickness of the leaf spring 21 is selected according to the expected service life of the leaf spring 21, the natural frequency is adjusted by opening the adjustment hole 211 to meet the use requirements.

[0040] Furthermore, according to a<b<1.05×a, it can be concluded that the equivalent mass of the striking component 2 must satisfy: .

[0041] It should be noted that the initial equivalent mass of the striking assembly 2 is m'. According to the above formula, the natural frequency b' of the leaf spring can be obtained. b'>1.05×a, which does not meet the preset requirements, resulting in the striking assembly 2 being unable to operate as expected. In this way, a hole can be opened on the leaf spring to form the above-mentioned adjustment hole 211, so that the equivalent mass of the striking assembly 2 is reduced. After the leaf spring hole is opened, the equivalent mass of the striking assembly 2 is m'', so that m'' is at In this embodiment, the opening of the adjustment hole 211 on the leaf spring can not only enable the under-screen material of the flexible screen to pass through the leaf spring smoothly, but also adjust the vibration frequency of the leaf spring so that the vibration frequency of the leaf spring after adjustment is consistent with a~1.05×a, thereby improving the striking effect of the striking component 2 and improving the screening efficiency of the screening device.

[0042] Alternatively, the initial equivalent mass of the striking component 2 is m', and the natural frequency b' of the leaf spring can be obtained according to the above formula, b'<a, which does not meet the preset requirements, resulting in the striking component 2 being unable to operate as expected; at this time, the equivalent mass of the striking component 2 can be increased by increasing the number of the splints 231 of the splint group 23, or a counterweight block can be set on the leaf spring after the hole is opened, such as adding a plurality of counterweight blocks at the connection between the leaf spring and the striking blade head, so that the equivalent mass of the striking component 2 is increased to m'', so that m'' is at The natural frequency b'' of the leaf spring after the hole is opened conforms to the range of a~1.05×a. Optionally, in one implementation of the present embodiment, the clamping plate group 23 can not only be used to fix the leaf spring, but also play the role of a counterweight, so that the vibration frequency of the leaf spring conforms to a~1.05×a, thereby improving the striking effect of the striking assembly 2 and improving the screening efficiency of the screening device.

[0043] The equivalent mass of the striking assembly 2 is the product of the mass of the leaf spring, the clamping plate group 23, the fixing member and the connecting member 24 and the error coefficient.

[0044] like Figures 1 to 5 As shown, in this embodiment, the striking assembly 2 further includes a connecting member 24. The connecting member 24 is located below the lower splint group 23, and is used to connect the striking assembly 2 with the screen assembly 1 and to connect the striking assembly 2 with the equipment frame. The connecting member 24 includes a crossbeam and L-shaped connecting plates located at both ends of the crossbeam, and the crossbeam is located below the lower splint group 23. The fixing member passes through the crossbeam, the two groups of splint groups 23 and the leaf spring in sequence and is connected to the mounting frame of the first screen frame 11, and the L-shaped connecting plates on both sides are respectively connected to the equipment frame. By providing the connecting member 24, the fixing effect of the striking assembly 2 can be improved, so that the striking assembly 2 can maintain long-term stable operation.

[0045] like Figure 6As shown, in this embodiment, the above-mentioned screening device can also include a hard screen assembly 4. The hard screen assembly 4 is fixedly arranged in the equipment frame, and the hard screen assembly 4 includes a second screen frame 41 and a hard screen string 42. The hard screen string 42 is made of high-strength wear-resistant material and is arranged in an S-shaped bending. All hard screen strings 42 are arranged horizontally or vertically to form a hard screen. When in use, the hard screen assembly 4 vibrates under the action of the vibration source, and the curved hard screen string 42 can also avoid the blockage of the first screen frame 11 of the hard screen assembly 4. The material on the hard screen assembly 4 can vibrate and advance between the curved slits between two adjacent hard screen strings 42, so that the material can quickly cover the hard screen assembly 4 and effectively pass through the screen, which can effectively increase the processing capacity and realize large-capacity screening.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A screen with a new striking method, characterized in that: include: A screen assembly (1) and a striking assembly (2); The screen assembly (1) comprises a first screen frame (11) and a flexible screen arranged in the first screen frame (11); The striking assembly (2) is arranged below the screen assembly (1), and comprises a leaf spring (21) and a striking blade head (22); one end of the leaf spring (21) is fixedly arranged, and the other end is provided with the striking blade head (22); a plurality of adjustment holes (211) are provided on the surface of the leaf spring (21) to adjust the natural frequency of the leaf spring (21); When the screen assembly (1) vibrates, the leaf spring (21) vibrates along with the screen assembly (1), so that the striking blade head (22) can repeatedly strike the flexible screen.

2. The screen with a novel striking method according to claim 1, characterized in that: The striking blade head (22) is located below the middle position of the flexible screen.

3. The screen with a novel striking method according to claim 1, characterized in that: The striking assembly (2) further comprises two groups of clamping plate groups (23); The leaf spring (21) is arranged between two groups of the clamping plate groups (23), and the clamping plate groups (23) are fixed on the first screen frame (11) via fixing members.

4. The screen with a novel striking method according to any one of claims 1 to 3, characterized in that: The striking components (2) are arranged in multiple groups; all of the striking components (2) are arranged in sequence along the edge of the first screen frame (11).

5. The screen with a novel striking method according to any one of claims 1 to 3, characterized in that: The screen assembly (1) further comprises a reinforcement member (13); The reinforcement member (13) is arranged in the first screen frame (11), and both ends of the reinforcement member (13) are respectively connected to the first screen frame (11); the striking blade head (22) is provided with avoidance grooves (221) corresponding to the reinforcement members (13) one by one; when the striking blade head (22) strikes the flexible screen, the reinforcement member (13) is located in the corresponding avoidance groove (221).

6. A screening device, characterized in that: It comprises an equipment frame, a vibration source and a screen with a novel striking method as claimed in any one of claims 1 to 5; The screen with a novel striking method is fixedly arranged in the equipment frame; the vibration source is transmission-connected to the equipment frame and is used to drive the equipment frame to vibrate.

7. The screening device according to claim 6, characterized in that: The vibration frequency of the vibration source during operation is a; the natural frequency of the leaf spring (21) is b, wherein: a<b<1.05×a.

8. The screening device according to claim 7, characterized in that: After the leaf spring (21) is provided with an adjustment hole (211), the equivalent mass of the striking component (2) is m, where: ； In the formula, n is the number of leaf springs; E is the elastic modulus of the leaf spring; x is the width of the leaf spring; t is the thickness of the leaf spring; l is the length of the leaf spring.

9. The screening device according to claim 6, characterized in that: The striking assembly (2) further comprises a connecting member (24); The connecting member (24) is arranged below the clamping plate group (23) located below, the connecting member (24) and the two clamping plate groups (23) are fixed on the first screen frame (11) via fixing members, and the connecting member (24) is also connected to the equipment frame.

10. The screening device according to claim 6, characterized in that: Also included is a rigid screen assembly (1); The hard screen assembly (1) is fixedly arranged in the equipment frame and is located above the screen assembly (1) with a novel striking method.

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