Stepped percussion screen and sticky material separation method

Abstract

The present invention discloses a stepped percussion screen, comprising a frame, a feed port provided at the rear end of the frame, the rear end of the frame being higher than the front end thereof, a plurality of percussion screen units being arranged on the frame in a stepped manner from the back to the front, the discharge end of the percussion screen unit at the relatively rear end being located above the feed end of the percussion screen unit at the relatively front end, the discharge end of the percussion screen unit at the front end serving as the discharge end for the oversize material, each percussion screen unit having a horizontal screen plate, the undersize material discharge end of each percussion screen unit being located below the horizontal screen plate of each percussion screen unit. A disturbance kneading unit is provided above the horizontal screen plate of each percussion screen unit, the disturbance kneading unit being used to perform disturbance kneading on viscous materials; the present invention also discloses a corresponding viscous material separation method. The present invention has a good separation effect on viscous materials through stepped vibration separation in combination with disturbance kneading, and does not require heating, so the screening cost is low, and does not require water washing and will not damage the environment.

Description

Technical Field

[0001] The present invention relates to the technical field of material separation, in particular to a vibrating screen. Background Art

[0002] Vibrating screens are widely used in solid particle classification processes across various industrial production processes. They are generally categorized by shape into circular and rectangular screens. Circular screens have a simple structure and are generally suitable for classifying small flow rates. Rectangular screens can be manufactured with larger surfaces to handle large flow rates. Vibrating screens can be vibrated in a variety of ways, including mechanical, electromagnetic, airflow, and primary percussion.

[0003] The structure of a typical vibrating screen includes a housing, screen, vibrator, vibration springs, and a fixed frame. In industrial applications, the factors that affect the working efficiency of the vibrating screen are mainly the properties of the material and the passing capacity of the screen.

[0004] Generally, sticky materials have poor permeability and can even quickly clog the screen, rendering the vibrating screen completely ineffective. The screen structure and vibration method also significantly impact the efficiency of the vibrating screen. For materials containing clay, separating finer particles at high moisture levels is particularly challenging.

[0005] In the process of separating bulk bauxite ore from clay, the 3mm (millimeter) sieve can hardly pass through the clay due to its high viscosity.

[0006] The key drawback of the technical solution for dry separation of sticky materials is that the materials need to be dried, which inevitably consumes a lot of energy and is too costly to be applied.

[0007] The technology of wet separation of sticky materials (such as clay) and target materials (such as bauxite ore, the characteristic of target materials and sticky materials is that the target material has a higher hardness than the sticky material) has been banned due to its significant negative impact on the environment. Therefore, it is necessary to develop a new type of vibrating screen that can separate sticky materials. Summary of the Invention

[0008] The object of the present invention is to provide a stepped percussion screen for separating viscous materials from target materials with higher hardness (higher than viscous materials), thereby avoiding both the high cost of dry separation and the environmental damage caused by wet separation, and achieving effective separation of viscous materials from target materials on the basis of environmental protection and low cost (without heating the materials).

[0009] To achieve the above-mentioned purpose, the stepped percussion screen of the present invention comprises a frame, with the direction of movement of the material on the screen as the downstream direction and the forward direction, a feed port being provided at the rear end of the frame, the rear end of the frame being higher than the front end thereof, and a plurality of percussion screen units being provided on the frame in a stepped manner from the rear to the front, the rear end of each percussion screen unit being the feed end thereof, and the front end of each percussion screen unit being the discharge end thereof;

[0010] The material entering the feed port enters the feed end of the rearmost percussion screen unit; among the adjacent percussion screen units, the discharge end of the relatively rear percussion screen unit is located above the feed end of the relatively front percussion screen unit, and the discharge end of the frontmost percussion screen unit serves as the discharge end for the oversize material. Each percussion screen unit has a horizontal screen plate, and below the horizontal screen plate of each percussion screen unit is the discharge end for the undersize material of each percussion screen unit.

[0011] A disturbance and kneading unit is provided above the horizontal screen plate of the knocking screen unit, and the disturbance and kneading unit is used to disturb and knead the sticky material;

[0012] The disturbance and kneading unit includes a mounting frame, which is connected to the frame through a connecting frame; a disturbance motor is provided upwardly on the mounting frame, the shaft of the disturbance motor extends downwardly from the mounting frame and is connected to a disturbance plate, the disturbance plate is hinged to a disturbance rod through a hinge seat, and the rotation plane of the disturbance rod around the hinge point of the hinge seat is a vertical plane; the bottom end of the disturbance rod is connected to a disturbance foot for disturbing and kneading the material; the disturbance foot and the hinge seat are evenly provided with more than two in the circumferential direction of the disturbance plate, the disturbance foot is located above the horizontal screen plate, and when the horizontal screen plate vibrates, the disturbance foot disturbs and kneads the material by rotating horizontally circumferentially with the disturbance plate, and when encountering larger materials, the disturbance foot and the disturbance rod rotate up and down around the hinge point of the hinge seat to avoid getting stuck.

[0013] The disturbance plate, the articulated seat, the disturbance rod and the disturbance foot constitute a group of disturbance kneading structures. Several disturbance kneading structures are provided in the same disturbance kneading unit. Except for a group of disturbance kneading structures directly connected to the shaft of the disturbance motor, the disturbance plates of the other disturbance kneading structures are all connected upward with a transmission shaft. The transmission shaft is installed on the mounting frame through a bearing. A driven transmission wheel is provided on the transmission shaft. A driving transmission wheel is provided on the shaft of the disturbance motor. The driving transmission wheel and the driven transmission wheel are connected by a transmission belt or a transmission chain.

[0014] The knocking screen unit includes a mounting frame connected to the frame, a knocking motor is installed at the rear end of the mounting frame, the output shaft of the knocking motor is connected to the knocking rod, and the knocking rod is located below the front end of the horizontal screen plate; the horizontal screen plate is supported downward on the supporting structure on the mounting frame;

[0015] Each time the knocking rod rotates one circle along with the output shaft of the knocking motor, it lifts the horizontal screen plate upwards and leaves the horizontal screen plate once; after the knocking rod lifts and leaves the front end of the horizontal screen plate, the horizontal screen plate falls back to the supporting structure, playing a vibrating screening role;

[0016] Side grid plates are provided on the left and right sides of the horizontal screen plate. The side grid plates are fixedly connected to the frame or mounting frame. The lower part of the side grid plates is movably inserted into the mesh of the horizontal screen plate through vertical rods, thereby allowing the horizontal screen plate to move up and down relative to the side grid plates.

[0017] A rear grille is provided at the rear of the horizontal screen plate. The rear grille is fixedly connected to the frame or mounting frame. The lower part of the rear grille is movably inserted into the mesh of the horizontal screen plate through a vertical rod, thereby allowing the horizontal screen plate to move up and down relative to the rear grille.

[0018] The rear grille plate is fixedly connected to an upper positioning strip for defining the upper limit position of the horizontal screen plate; the horizontal screen plate behind the rear grille plate is fixedly connected to a rear positioning strip for defining the front limit position of the horizontal screen plate; the horizontal screen plate in front of the rear grille plate is fixedly connected to a front positioning strip for defining the rear limit position of the horizontal screen plate; the support structure defines the lower limit position of the horizontal screen plate;

[0019] More than two knocking rods are evenly arranged along the circumference of the output shaft of the knocking motor.

[0020] The present invention also discloses a method for separating viscous materials using the stepped percussion screen, which is carried out in the following steps:

[0021] Add the sticky material from the feed port, start the percussion motor and the corresponding disturbance motor of each percussion screen unit, and the material is vibrated and screened on the horizontal screen plates of each level of percussion screen units. The oversize material flows forward and downward into the horizontal screen plates of the next level of percussion screen units. The oversize material flowing out of the horizontal screen plate of the frontmost percussion screen unit is the final oversize material, and the undersize material of the horizontal screen plates of the percussion screen units at each level is discarded as the final undersize material.

[0022] During the vibration screening process, the disturbance and kneading units corresponding to the percussion screen units at each level disturb and knead the materials on the horizontal screen plate through the horizontal circumferentially rotating disturbance rods and disturbance feet. When encountering large pieces of material, the disturbance rods and disturbance feet automatically rise by rotating vertically around the hinged seat to avoid getting stuck.

[0023] The present invention has the following advantages:

[0024] The present invention arranges multiple percussion screen units in a stepped manner to perform stepped multiple vibration screening on viscous materials, thereby improving the material separation rate through multiple vibration screening. On the one hand, no heating is required, so the screening cost is low; on the other hand, no water washing is required, which will not damage the environment.

[0025] The simple structure of the disturbance and kneading unit not only disturbs and kneads sticky materials but also prevents them from getting stuck. When encountering larger materials, the disturbance foot, positioned above the material, is lifted by the interaction force (the disturbance rod is hinged to the articulated seat, allowing the disturbance foot to be lifted under force). This lift reduces the interaction force with the material, preventing the rotational disturbance action of the disturbance rod from getting stuck.

[0026] The same disturbance and kneading unit is provided with multiple disturbance and kneading structures, which can strengthen the disturbance and kneading effect on the material on the horizontal screen plate of the corresponding knocking screen unit, and has a good disturbance and kneading effect on the material at various locations in the width direction of the horizontal screen plate.

[0027] The side grid plate can prevent the material from vibrating in the left and right directions and leaving the horizontal screen plate, while not hindering the horizontal screen plate from vibrating up and down.

[0028] The setting of the supporting structure, upper positioning bar, rear positioning bar and front positioning bar limits the up-down, front-back and forward movement positions of the horizontal screen plate, and the side grid plate limits the left-right position of the horizontal screen plate, so that the horizontal screen plate can vibrate freely under the action of the knocking rod, and has the upper, lower, left, right and forward movement positions limited, avoiding excessive displacement of the horizontal screen plate and causing negative impact on the screened material.

[0029] The multiple knocking rods are evenly distributed in the circumferential direction, so that the output shaft of the knocking motor can knock the horizontal screen plate multiple times (the number of knocking rods is the same as the number of knocking rods) every time it rotates one circle, thereby designing different knocking vibration frequencies by designing different numbers of knocking rods.

[0030] The present invention utilizes the following methods to separate the target material with higher hardness (such as bauxite ore) from the sticky material without drying or washing:

[0031] ① Each stage of vibratory screening is equipped with a disturbance and kneading function. When the disturbance foot and the disturbance rod disturb the material, sticky materials are squeezed, deformed, and even broken, while the target material with higher hardness is not squeezed, deformed, or broken. In this way, sticky materials (such as clay) are crushed and become the undersize material by taking advantage of the difference in hardness. There is a technical difficulty in achieving this, that is, the technology for achieving disturbance and kneading is prone to jamming. It is necessary to be able to both disturb and knead and avoid jamming.

[0032] ② Step-by-step multi-stage vibration screening; at each level of the screen plate, the disturbance foot and the disturbance rod will peel off a part of the sticky material adhering to the target material to form the undersize material. Through multi-stage vibration screening and multi-stage disturbance kneading, the sticky material (such as clay) adhering to the target material is gradually peeled off and a good separation efficiency is achieved.

[0033] In the process of realizing stepped multi-stage vibrating screening, there are also difficulties and their solutions. On the one hand, the horizontal screen plates at all levels must be able to vibrate freely under the drive of the knocking rod (the horizontal screen plates are supported downward on the supporting structure on the mounting frame so that the horizontal screen plates can vibrate freely). On the other hand, the displacement of the horizontal screen plates at all levels can be limited, and this limitation cannot cause obvious vibration resistance (through the vertical rods of the side grid plates and the rear grid plates inserted into the mesh of the horizontal screen plates, as well as the upper positioning bars, rear positioning bars and front positioning bars, the ultimate displacement is limited without limiting the basic vibration displacement of the horizontal screen plates). Thirdly, the material also needs to be limited so that the material on the screen can only move forward and downward and cannot flow backward or left and right (through the vertical rods of the side grid plates and the rear grid plates inserted into the mesh of the horizontal screen plates, the side grid plates and the rear grid plates limit the material on the screen to only leave the horizontal screen plate forward). BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of the step percussion screen of the present invention;

[0035] Figure 2 It is a schematic diagram of the structure of two adjacent knocking screen units cooperating;

[0036] Figure 3 It is a structural diagram of the disturbance kneading unit;

[0037] Figure 4 It is a side view structural diagram of the cooperation between the knocking screen unit and the disturbance kneading unit;

[0038] Figure 5 It is a structural diagram of the side grille plate;

[0039] Figure 6 It is a structural diagram of the rear grille plate;

[0040] Figure 7 yes Figure 2 Enlarged view of point A in the middle. DETAILED DESCRIPTION

[0041] like Figures 1 to 7 As shown, the step percussion screen of the present invention comprises a frame 1, with the direction of movement of the material on the screen as the downstream direction and the forward direction, the rear end (i.e., upstream end) of the frame 1 is provided with a feed port 2, and the rear end of the frame 1 is higher than its front end (i.e., downstream end, located at Figure 1 The right end of the frame 1 is provided with a plurality of knocking screen units 3 in a stepped manner from the back to the front, the rear end of each knocking screen unit 3 being its feeding end, and the front end of each knocking screen unit 3 being its discharging end;

[0042] The material entering from the feed port 2 enters the feed end of the rearmost (upstream) percussion screen unit 3; among adjacent percussion screen units 3, the discharge end of the relatively rear percussion screen unit 3 is located above the feed end of the relatively front percussion screen unit 3, and the discharge end of the frontmost percussion screen unit 3 serves as the discharge end for the material above the screen. Each percussion screen unit 3 has a horizontal screen plate 4, and below the horizontal screen plate 4 of each percussion screen unit 3 is the discharge end for the material below the screen. Figure 2 and Figure 7 The dotted line position is the position when the horizontal screen plate 4 is lifted.

[0043] The present invention arranges multiple percussion screen units 3 in a stepped manner to perform stepped multiple vibration screening on the viscous material, thereby improving the material separation rate through multiple vibration screening. On the one hand, no heating is required, so the screening cost is low, and on the other hand, no water washing is required, which will not damage the environment.

[0044] A disturbance and kneading unit 5 is provided above the horizontal screen plate 4 of the knocking screen unit 3, and the disturbance and kneading unit 5 is used to disturb and knead the sticky material;

[0045] The disturbance and kneading unit 5 includes a mounting frame 6, which is connected to the frame 1 through a connecting frame 7; the mounting frame 6 is provided with a disturbance motor 8 upward, and the axis of the disturbance motor 8 extends downward from the mounting frame 6 and is connected to a horizontally arranged disturbance plate 9, and the disturbance plate 9 is hinged to a disturbance rod 11 through a hinge seat 10, and the rotation plane of the disturbance rod 11 around the hinge point of the hinge seat 10 is a vertical plane; the bottom end of the disturbance rod 11 is connected to a disturbance foot 12 for disturbing and kneading the material (the disturbance foot 12 is preferably spherical); the disturbance foot 12 and the hinge seat 10 are evenly provided with more than two in the circumferential direction of the disturbance plate 9, and the disturbance foot 12 is located above the horizontal screen plate 4. When the horizontal screen plate 4 vibrates, the disturbance foot 12 disturbs and rubs the material by rotating horizontally circumferentially with the disturbance plate 9. When encountering larger materials, the disturbance foot 12 and the disturbance rod 11 rotate up and down around the hinge point of the hinge seat 10 to avoid getting stuck.

[0046] The agitation and kneading unit 5 has a simple structure, capable of both agitating and kneading viscous materials and preventing jamming. When encountering larger materials, the agitation foot 12 is positioned above the material, and thus, the interaction force causes it to lift (the agitation rod 11 is hinged to the hinged seat 10, allowing the agitation foot 12 to be lifted under force). This lift reduces the interaction force with the material, thus preventing the agitation rod 11's rotational agitation action from jamming.

[0047] The disturbance plate 9, the articulated seat 10, the disturbance rod 11 and the disturbance foot 12 constitute a group of disturbance kneading structures. Several disturbance kneading structures are provided in the same disturbance kneading unit 5. Except for a group of disturbance kneading structures directly connected to the shaft of the disturbance motor 8, the disturbance plates 9 of the other disturbance kneading structures are all connected upward with a transmission shaft 13, and the transmission shaft 13 is installed on the mounting frame 6 through a bearing.

[0048] A driven transmission wheel 14 is provided on the transmission shaft 13, and a driving transmission wheel 15 is provided on the shaft of the disturbance motor 8. The driving transmission wheel 15 and the driven transmission wheel 14 are connected to each other through a transmission belt or a transmission chain. Figure 4 The reference numeral 16 indicates a transmission belt or a transmission chain.

[0049] The same disturbance and kneading unit 5 is provided with multiple disturbance and kneading structures, which can strengthen the disturbance and kneading effect on the material on the horizontal screen plate 4 of the corresponding knocking screen unit 3, and have a good disturbance and kneading effect on the material at all locations in the width direction of the horizontal screen plate 4.

[0050] The knocking screen unit 3 includes a mounting frame 17 connected to the frame 1, a knocking motor 18 is installed at the rear end of the mounting frame 17, and the output shaft of the knocking motor 18 is connected to a knocking rod 19, which is located below the front end of the horizontal screen plate 4; the horizontal screen plate 4 is supported downwardly on a support structure 20 on the mounting frame 17;

[0051] The knocking rod 19 rotates one circle along with the output shaft of the knocking motor 18, and lifts the horizontal screen plate 4 upward and leaves the horizontal screen plate 4 once; after the knocking rod 19 lifts and leaves the front end of the horizontal screen plate 4, the horizontal screen plate 4 falls back to the supporting structure 20, playing a vibrating screening role;

[0052] Side grid plates 21 are provided on the left and right sides of the horizontal screen plate 4, respectively. The side grid plates 21 are fixedly connected to the frame 1 or the mounting frame 17 (which can be the mounting frame 17 of the upper-level percussion screen unit 3). The lower part of the side grid plates 21 is movably inserted into the mesh of the horizontal screen plate 4 through the vertical rod 22, thereby allowing the horizontal screen plate 4 to move up and down relative to the side grid plates 21.

[0053] A rear grille plate 23 is provided at the rear of the horizontal screen plate 4. The rear grille plate 23 is fixedly connected to the frame 1 or the mounting frame 17. The lower portion of the rear grille plate 23 is movably inserted into the mesh of the horizontal screen plate 4 via a vertical rod 22, thereby allowing the horizontal screen plate 4 to move up and down relative to the rear grille plate 23.

[0054] An upper positioning strip 24 for defining the upper limit position of the horizontal sieve plate 4 is fixedly connected to the rear grille plate 23. A rear positioning strip 25 for defining the front limit position of the horizontal sieve plate 4 is fixedly connected to the horizontal sieve plate 4 behind the rear grille plate 23. A front positioning strip 26 for defining the rear limit position of the horizontal sieve plate 4 is fixedly connected downward to the horizontal sieve plate 4 in front of the rear grille plate 23. The support structure 20 defines the lower limit position of the horizontal sieve plate 4.

[0055] Of course, the structure for defining the extreme positions of the horizontal screen plate 4 can be modified. For example, the positioning functions of the rear positioning bar 25 and the front positioning bar 26 can be replaced by two adjacent vertical bars provided on the side grid plate 21. After the two vertical bars are inserted into two adjacent meshes of the horizontal screen plate 4, the front and rear extreme positions of the horizontal screen plate 4 are positioned by defining the front and rear displacement of the meshes of the horizontal screen plate 4. Such modifications fall within the scope of protection of the present invention.

[0056] The side grid plates 21 can prevent the material from vibrating in the left-right direction and leaving the horizontal screen plate 4, while not hindering the horizontal screen plate 4 from vibrating up and down.

[0057] The arrangement of the support structure 20, the upper positioning bar 24, the rear positioning bar 25 and the front positioning bar 26 limits the up-down, forward-backward movement position of the horizontal screen plate 4, and the side grid plate 21 limits the left-right position of the horizontal screen plate 4, so that the horizontal screen plate 4 can vibrate freely under the action of the knocking rod 19, and has the upper-lower, left-right, forward-backward movement position limit, thereby avoiding excessive displacement of the horizontal screen plate 4 and causing negative impact on the screened material.

[0058] The knocking rods 19 are evenly provided with two or more knocking rods 19 along the circumference of the output shaft of the knocking motor 18. The multiple knocking rods 19 are evenly distributed in the circumference, so that the output shaft of the knocking motor 18 can knock the horizontal screen plate 4 multiple times (the number of knocking rods 19 is equal to the number of knocking rods 19) for each rotation of the output shaft. Therefore, different knocking vibration frequencies can be designed by designing different numbers of knocking rods 19.

[0059] The height difference between the percussion screen units installed on the upper and lower adjacent steps is 30-500 mm (including both ends). The horizontal screen plate is a strip screen plate or a punched screen plate.

[0060] The present invention also discloses a method for separating viscous materials using the stepped percussion screen, which is carried out in the following steps:

[0061] The viscous material is added from the feed port 2, and the percussion motor 18 and the corresponding disturbance motor 8 of each percussion screen unit 3 are started. The material is vibrated and screened on the horizontal screen plates 4 of the percussion screen units 3 at each level. The oversize material flows forward and downward into the horizontal screen plates 4 of the next level percussion screen unit 3. The oversize material flowing out of the horizontal screen plate 4 of the frontmost percussion screen unit 3 is the final oversize material (such as bauxite ore, which is the target product), and the undersize material of the horizontal screen plates 4 of the percussion screen units 3 at each level is discarded as the final undersize material.

[0062] During the vibration screening process, the disturbance and kneading units 5 corresponding to the percussion screen units 3 at each level disturb and knead the material on the horizontal screen plate 4 through the horizontal circumferentially rotating disturbance rods 11 and disturbance feet 12. When encountering large pieces of material, the disturbance rods 11 and disturbance feet 12 are automatically lifted by rotating vertically around the articulated seat 10 to avoid getting stuck.

[0063] The present invention utilizes the following methods to separate the target material with higher hardness (such as bauxite ore) from the sticky material without drying or washing:

[0064] ① Each stage of vibratory screening incorporates a disturbing and kneading effect. When the disturbing foot 12 and the disturbing rod 11 disturb the material, sticky materials are squeezed, deformed, and even crushed, while harder target materials are not. By utilizing this difference in hardness, sticky materials (such as clay) are crushed and become the undersize material. Achieving this presents a technical difficulty: the technology used to achieve this disturbing and kneading process is prone to jamming. It is necessary to achieve both disturbing and kneading while avoiding jamming.

[0065] ② Step-by-step multi-stage vibration screening; at each level of the horizontal screen plate 4, the disturbance foot 12 and the disturbance rod 11 will peel off a part of the sticky material adhering to the target material to form the undersize material. Through multi-stage vibration screening and multi-stage disturbance kneading, the sticky material (such as clay) adhering to the target material is gradually peeled off and a good separation efficiency is achieved.

[0066] In the process of realizing stepped multi-stage vibrating screening, there are also difficulties and solutions. On the one hand, the horizontal screen plates 4 at all levels must be able to vibrate freely under the drive of the knocking rod 19 (the horizontal screen plates 4 are supported downward on the support structure 20 on the frame 1, so that the horizontal screen plates 4 can vibrate freely). On the other hand, the displacement of the horizontal screen plates 4 at all levels can be limited. This limitation cannot cause obvious vibration resistance (through the vertical rods 22 of the side grid plates 21 and the rear grid plates 23 inserted into the mesh of the horizontal screen plates 4, as well as the upper positioning bars 24, the rear positioning bars 25 and the front positioning bars 26, without limiting the basic vibration displacement of the horizontal screen plates 4, its limit displacement is limited); thirdly, it is also necessary to limit the material so that the material on the screen can only move forward and downward and cannot flow backward or left and right (through the vertical rods 22 of the side grid plates 21 and the rear grid plates 23 inserted into the mesh of the horizontal screen plates 4, the side grid plates 21 and the rear grid plates 23 limit the material on the screen to only leave the horizontal screen plates 4 forward).

[0067] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The stepped percussion screen comprises a frame, with the direction of movement of the material on the screen as the downstream direction and the forward direction, and a feed port provided at the rear end of the frame, characterized by: The rear end of the frame is higher than its front end, and a number of percussion screen units are arranged on the frame in a stepped manner from the back to the front. The rear end of each percussion screen unit is its feeding end, and the front end of each percussion screen unit is its discharging end. The material entering the feed port enters the feed end of the rearmost percussion screen unit; among adjacent percussion screen units, the discharge end of the relatively rear percussion screen unit is located above the feed end of the relatively front percussion screen unit, and the discharge end of the frontmost percussion screen unit serves as the discharge end for the oversize material. Each percussion screen unit has a horizontal screen plate, and the lower portion of the horizontal screen plate of each percussion screen unit is the discharge end for the undersize material of each percussion screen unit. A disturbance and kneading unit is provided above the horizontal screen plate of the knocking screen unit, and the disturbance and kneading unit is used to disturb and knead the sticky material; The disturbance and kneading unit includes a mounting frame, which is connected to the frame through a connecting frame; a disturbance motor is provided upwardly on the mounting frame, the shaft of the disturbance motor extends downwardly from the mounting frame and is connected to a disturbance plate, the disturbance plate is hinged to a disturbance rod through a hinge seat, and the rotation plane of the disturbance rod around the hinge point of the hinge seat is a vertical plane; the bottom end of the disturbance rod is connected to a disturbance foot for disturbing and kneading the material; the disturbance foot is spherical; the disturbance foot and the hinge seat are evenly provided with more than two disturbance feet in the circumferential direction of the disturbance plate, the disturbance foot is located above the horizontal screen plate, and when the horizontal screen plate vibrates, the disturbance foot disturbs and kneads the material by rotating horizontally circumferentially with the disturbance plate, and when encountering larger materials, the disturbance foot and the disturbance rod rotate up and down around the hinge point of the hinge seat to avoid getting stuck; The disturbance plate, the articulated seat, the disturbance rod and the disturbance foot constitute a group of disturbance and kneading structures. Several disturbance and kneading structures are provided in the same disturbance and kneading unit. Except for a group of disturbance and kneading structures directly connected to the shaft of the disturbance motor, the disturbance plates of the other disturbance and kneading structures are all upwardly connected to a transmission shaft, which is mounted on the mounting frame through a bearing. A driven transmission wheel is provided on the transmission shaft, and an active transmission wheel is provided on the shaft of the disturbance motor. The active transmission wheel and the driven transmission wheel are connected through a transmission belt or a transmission chain. The knocking screen unit includes a mounting frame connected to the frame, a knocking motor is installed at the rear end of the mounting frame, the output shaft of the knocking motor is connected to the knocking rod, and the knocking rod is located below the front end of the horizontal screen plate; the horizontal screen plate is supported downward on the supporting structure on the mounting frame; Each time the knocking rod rotates one circle along with the output shaft of the knocking motor, it lifts the horizontal screen plate upwards and leaves the horizontal screen plate once; after the knocking rod lifts and leaves the front end of the horizontal screen plate, the horizontal screen plate falls back to the supporting structure, playing a vibrating screening role; Side grid plates are provided on the left and right sides of the horizontal screen plate. The side grid plates are fixedly connected to the frame or mounting frame. The lower part of the side grid plates is movably inserted into the mesh of the horizontal screen plate through vertical rods, thereby allowing the horizontal screen plate to move up and down relative to the side grid plates. A rear grille is provided at the rear of the horizontal screen plate. The rear grille is fixedly connected to the frame or mounting frame. The lower part of the rear grille is movably inserted into the mesh of the horizontal screen plate through a vertical rod, thereby allowing the horizontal screen plate to move up and down relative to the rear grille. An upper positioning strip for defining the upper limit position of the horizontal sieve plate is fixedly connected to the rear grille plate, a rear positioning strip for defining the front limit position of the horizontal sieve plate is fixedly connected to the horizontal sieve plate behind the rear grille plate, and a front positioning strip for defining the rear limit position of the horizontal sieve plate is fixedly connected to the horizontal sieve plate in front of the rear grille plate; the supporting structure defines the lower limit position of the horizontal sieve plate.

2. The stepped percussion screen according to claim 1, characterized in that: More than two knocking rods are evenly arranged along the circumference of the output shaft of the knocking motor.

3. The method for separating viscous materials using the step percussion screen according to claim 2 is characterized in that Follow these steps: Add the sticky material from the feed port, start the percussion motor and the corresponding disturbance motor of each percussion screen unit, and the material is vibrated and screened on the horizontal screen plates of each level of percussion screen units. The oversize material flows forward and downward into the horizontal screen plates of the next level of percussion screen units. The oversize material flowing out of the horizontal screen plate of the frontmost percussion screen unit is the final oversize material, and the undersize material of the horizontal screen plates of the percussion screen units at each level is discarded as the final undersize material. During the vibration screening process, the disturbance and kneading units corresponding to the percussion screen units at each level disturb and knead the materials on the horizontal screen plate through the horizontal circumferentially rotating disturbance rods and disturbance feet. When encountering large pieces of material, the disturbance rods and disturbance feet automatically rise by rotating vertically around the hinged seat to avoid getting stuck.

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