Swing type screening equipment for environmental protection and screening method

Abstract

The invention relates to the technical field of garbage sorting treatment equipment, and discloses environment-friendly swing type screening equipment and a screening method.The environment-friendly swing type screening equipment comprises side edge supporting plates and a supporting mechanism of a material guiding inclined plate which are oppositely arranged, the material guiding inclined plate is connected between the two side edge supporting plates and located at the feeding end of the equipment, and the side edge supporting plates and the material guiding inclined plate are oppositely arranged. The guiding device is used for guiding to-be-screened materials; the screening mechanism is erected between the two side supporting plates, and a plurality of screening parts distributed in a preset state are arranged in the screening mechanism; the swing transmission mechanism is in transmission connection with the driving motor and is used for driving the screening component to swing back and forth; the protective cover plate is provided with a feeding port and an observation window, and the feeding port corresponds to the feeding position of the guide inclined plate; the whole equipment is obliquely arranged at a preset angle, and materials with different particle sizes are screened through reciprocating swing of the screening component.

Description

Technical Field

[0001] This application relates to the field of waste sorting and processing equipment technology, and in particular to an environmentally friendly oscillating screening device and screening method. Background Technology

[0002] In the waste management industry, waste screening is a crucial step in achieving waste reduction and resource utilization. It requires separating materials of different particle sizes and types from mixed waste for subsequent recycling or harmless treatment. Existing waste screening equipment mainly includes drum screens, vibrating screens, and air separators, among which drum screens and vibrating screens are the mainstream equipment based on particle size screening.

[0003] The problem of long, strip-shaped waste entanglement is prominent: Mixed waste often contains long, strip-shaped materials such as waste plastics, branches, and waste clothing. The screens of traditional drum screens or vibrating screens are easily entangled and stuck by such materials, leading to screen hole blockage, a significant decrease in screening efficiency, and even the need to stop the machine for cleaning, affecting the continuity of the processing flow; the material stays on the screen surface for a short time, and some fine particles are easily discharged along with the coarse material, resulting in insufficient screening accuracy; the waste material has an irregular shape and complex composition, and the existing equipment has a simple feeding guide structure, which easily leads to material accumulation and spillage, further reducing screening efficiency; To address the aforementioned issues, there is an urgent need for a waste screening device that can prevent long strips of waste from tangling and operate stably, in order to meet the actual needs of the waste treatment industry. Summary of the Invention

[0004] To address the aforementioned problems, this application provides an environmentally friendly oscillating screening device and screening method.

[0005] The environmentally friendly oscillating screening equipment and screening method provided in this application adopt the following technical solution: Firstly, an environmentally friendly oscillating screening device is proposed, comprising a support mechanism for a pair of opposing side support plates and a guide plate, wherein the guide plate is connected between the two side support plates and is located at the feed end of the device for guiding the material to be screened; a screening mechanism mounted between the two side support plates, wherein several screening components are arranged in a preset state; an oscillating transmission mechanism connected to a drive motor for driving the screening components to oscillate back and forth; a protective cover plate having a feed port and an observation window, wherein the feed port corresponds to the feed position of the guide plate; the entire device is inclined at a predetermined angle, and the screening of materials of different particle sizes is achieved through the reciprocating oscillation of the screening components.

[0006] Furthermore, the screening component is configured as screening plates, and a plurality of screening plates are distributed in a predetermined state of alternation, and the reciprocating swing direction of the screening plates is configured as left and right swing.

[0007] Furthermore, the swing transmission mechanism includes: a main transmission shaft that is driven to the output end of the drive motor; a swing linkage frame that is linked to the main transmission shaft through a transmission connecting rod; a secondary linkage frame that is connected to the swing linkage frame through a transmission connecting member; and the swing linkage frame and the secondary linkage frame are driven to the screening component.

[0008] Furthermore, when the main drive shaft rotates, it causes the transmission connecting rod to deform, thereby driving the swing linkage frame, transmission connecting parts and secondary linkage frame to drive synchronously, thus driving the screening component to reciprocate.

[0009] Furthermore, the tilt angle of the guide plate is consistent with the predetermined tilt angle of the entire equipment, and the discharge end of the guide plate extends above the screening component of the screening mechanism.

[0010] Furthermore, the screening plate has a plate-like structure, with its length direction parallel to the tilt direction of the equipment. The edges of the screening plate are provided with a rounded chamfer structure. Several screening plates are arranged in layers along the height direction in the screening mechanism, and the staggered directions of adjacent layers of screening plates are opposite, forming a continuous screening channel.

[0011] Furthermore, the swing linkage frame is provided with multiple linkage interfaces along the height direction. One end of the secondary linkage frame is connected to one linkage interface of the swing linkage frame, and the other end is connected to the screening plate of the corresponding height layer. By synchronously driving multiple secondary linkage frames through the swing linkage frame, the synchronous reciprocating swing drive of the screening plates of different heights can be realized.

[0012] Furthermore, the screening plates are arranged in a combination of various forms, including at least the following from top to bottom: wide-spacing arc-shaped screening plates, rectangular screening plates, and anti-winding screening plates; the wide-spacing arc-shaped screening plates have an arc-shaped plate structure; the middle layer rectangular screening plates are rectangular plates with rounded edges, and rectangular blocks with arc-shaped outer sides are arranged between adjacent middle layer rectangular screening plates; rectangular blocks are arranged between adjacent anti-winding screening plates, and the outer arc surface of the rectangular blocks is adapted to the opposite arc surface of the anti-winding screening plates.

[0013] Secondly, a screening method for an environmentally friendly oscillating screening device is proposed, including the following steps: S1, the material to be screened is fed into the feed port of the protective cover plate, and the material is guided by the guide plate along the inclined direction of the equipment to the layered and staggered screening plates in the screening mechanism. S2. Start the drive motor. The drive motor drives the main transmission rod shaft of the swing transmission mechanism to rotate. During the rotation of the main transmission rod shaft, the transmission connecting rod is deformed, thereby driving the swing linkage frame to move synchronously. S3. The swing linkage frame synchronously drives multiple secondary linkage frames connected to it through multiple linkage interfaces set along the height direction. Each secondary linkage frame drives the screening plate of the corresponding height layer to swing back and forth. S4. Under the reciprocating swing of the screening plates, the material that meets the particle size requirements falls through the continuous screening channel formed by the screening plates, while the material that does not meet the particle size requirements is discharged from the discharge end of the screening mechanism along the inclined direction of the equipment. The long strip material is prevented from getting tangled in the crisscross swing of the screening plates. S5. During the screening process, the screening status of the material is observed in real time through the observation window of the protective cover. The output speed of the drive motor is adjusted according to the screening effect, thereby adjusting the reciprocating oscillation frequency of the screening plate to ensure screening efficiency.

[0014] In summary, this application includes the following beneficial technical effects: By using staggered screening plates and a reciprocating transmission mechanism, the entanglement of long strips of waste is disrupted, preventing waste from jamming the equipment, ensuring the continuity of the screening process, and significantly reducing downtime for cleaning.

[0015] The layered and staggered screening plates form a continuous screening channel, extending the waste residence time and improving the separation effect of fine-particle materials. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an environmentally friendly oscillating screening device according to the present invention.

[0017] Figure 2 This is a front view of an environmentally friendly oscillating screening device according to the present invention.

[0018] Figure 3 This is a perspective view of an environmentally friendly oscillating screening device according to the present invention.

[0019] Figure 4 This is a top view of an environmentally friendly oscillating screening device according to the present invention.

[0020] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0021] Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0022] Figure 7 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0023] Explanation of reference numerals in the attached drawings: 1. Support mechanism; 2. Swing transmission mechanism; 3. Screening mechanism; 4. Protective cover plate; 5. Drive motor; 11. Side support plate; 12. Guide inclined plate; 21. Main transmission shaft; 22. Transmission connecting rod; 23. Swing linkage frame; 24. Secondary linkage frame; 25. Transmission connecting piece; 31. Screening plate; 42. Feed port; 43. Observation window. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1 —7 provides a further detailed description of this application. By optimizing the structure of the sorting mechanism, the transmission method, and the feed guide design, efficient grading and sorting of materials of different particle sizes in mixed waste is achieved, while effectively avoiding the entanglement of long strips of waste, improving the stability of equipment operation and sorting accuracy, and reducing maintenance costs.

[0025] Example 1 An environmentally friendly oscillating screening device, such as Figure 1 As shown, it includes a support mechanism 1, a screening mechanism 3, a swing transmission mechanism 2, a protective cover plate 4, and a drive motor 5; like Figure 1 As shown, the support mechanism 1 includes two opposing side support plates 11 and a guide plate 12. The guide plate 12 is fixedly connected between the two side support plates 11 and is located at the feed end of the equipment to guide the mixed waste into the machine, ensuring that the waste is smoothly transported to the screening mechanism 3 and preventing accumulation and spillage. The screening mechanism 3 is mounted between the two side support plates 11 and has several screening components arranged in a preset state inside. The screening components are used to classify and screen materials of different particle sizes in the mixed waste. The swing transmission mechanism 2 is connected to the drive motor 5 and is the screening part. The component provides the driving force to drive the screening component to reciprocate and oscillate, thereby achieving the screening and separation of waste materials through the oscillation action; the protective cover plate 4 is installed on the upper part of the equipment, which is equipped with a feed port 42 and an observation window 43. The feed port 42 corresponds to the feed position of the guide inclined plate 12, which facilitates the accurate input of waste. The observation window 43 is used to observe the screening status inside the equipment in real time and promptly detect abnormalities such as blockage and entanglement; the entire equipment is set at a predetermined angle, and the reciprocating oscillation of the screening component achieves the screening of waste of different particle sizes. The inclined structure of the equipment assists in the transportation of waste materials and improves the screening efficiency.

[0026] like Figure 1 and Figure 4As shown, the screening component is configured as screening plates 31, with several screening plates 31 arranged in a pre-defined, staggered pattern. The reciprocating oscillation direction of the screening plates 31 is set to left and right. The staggered oscillation of the screening plates 31 disrupts the entanglement of long strips of waste. Under the action of the staggered oscillating screening plates 31, the long strips of waste cannot form a stable entanglement and move with the material flow, effectively preventing waste from entanglement with the equipment. Simultaneously, the oscillation motion increases the contact frequency between the waste and the screening plates 31, improving the throughput of fine-particle waste and increasing screening efficiency.

[0027] like Figures 1 to 3 As shown, the swing transmission mechanism 2 includes a main drive shaft 21, a swing linkage frame 23, a secondary linkage frame 24, and a transmission connector 25. The main drive shaft 21 is connected to the output end of the drive motor 5 via a coupling to ensure stable power transmission. The swing linkage frame 23 is linked to the main drive shaft 21 via a transmission connecting rod 22, and the secondary linkage frame 24 is connected to the swing linkage frame 23 via the transmission connector 25, which facilitates equipment disassembly and maintenance and reduces maintenance costs. The swing linkage frame 23 and the secondary linkage frame 24 are connected to the screening components to realize the step-by-step transmission of power from the drive motor 5 to the screening components.

[0028] In the above embodiment, when the main drive shaft 21 rotates, it causes the transmission connecting rod 22 to deform, thereby driving the swing linkage frame 23, the transmission connecting piece 25, and the secondary linkage frame 24 to move synchronously, thus driving the screening component to reciprocate. The deformation characteristics of the transmission connecting rod 22 can buffer the impact force during the transmission process, reduce the wear of hard waste on the equipment, and at the same time ensure the synchronous movement of each transmission component, improving the transmission stability.

[0029] In the above embodiment, the inclination angle of the guide plate 12 is consistent with the predetermined inclination angle of the entire equipment, and the discharge end of the guide plate 12 extends above the screening component of the screening mechanism 3. This allows the mixed waste to slide smoothly down the guide plate 12 to the screening component, preventing waste from accumulating or spilling during the feeding process and ensuring the continuity of the screening process. The surface of the guide plate 12 can be provided with a wear-resistant and anti-slip coating to reduce wear during the waste sliding process and extend the service life of the equipment.

[0030] In the above embodiment, the screening plate 31 is further shaped like a plate, with its length direction parallel to the tilting direction of the equipment. The edge of the screening plate 31 is provided with a rounded chamfer structure to avoid scratching recyclable materials (plastics, paper) in the waste, and to prevent snagging on long strips of waste. Several screening plates 31 are arranged in layers along the height direction in the screening mechanism 3, and the staggered directions of adjacent layers of screening plates 31 are opposite, forming a continuous screening channel, which prolongs the residence time of waste in the screening mechanism 3 and improves the screening accuracy.

[0031] In the above embodiment, the swing linkage frame 23 is further provided with multiple linkage interfaces along the height direction. One end of the secondary linkage frame 24 is connected to one linkage interface of the swing linkage frame 23, and the other end is connected to the screening plate 31 of the corresponding height layer. By synchronously driving the multiple secondary linkage frames 24 through the swing linkage frame 23, the synchronous reciprocating swing drive of the screening plates 31 at different heights is realized. This ensures that the movement of the screening plates 31 at each layer is consistent, avoids the decrease in screening efficiency caused by asynchronous transmission, and facilitates the adjustment of the connection position between the secondary linkage frame 24 and the screening plate 31 according to the waste screening requirements, adapting to the screening requirements of different particle sizes.

[0032] This embodiment also discloses a screening method based on the above-mentioned environmentally friendly oscillating screening equipment, including the following steps: S1. Mixed waste is fed into the feed port 42 of the protective cover plate 4. Under the action of gravity, the waste is smoothly guided by the guide plate 12 along the inclined direction of the equipment to the screening plates 31 in the screening mechanism 3, which are layered and staggered. S2. Start the drive motor 5. The drive motor 5 outputs power to drive the main transmission rod shaft 21 of the swing transmission mechanism 2 to rotate. During the rotation of the main transmission rod shaft 21, the transmission connecting rod 22 undergoes elastic deformation, thereby driving the swing linkage frame 23 to perform reciprocating motion synchronously. S3, the swing linkage frame 23 drives the corresponding secondary linkage frame 24 through multiple linkage interfaces set along its height direction. Each secondary linkage frame 24 drives the screening plate 31 of the corresponding height layer to swing left and right. The swinging action of the screening plate 31 forms a screening force on the mixed waste on it. S4. Under the reciprocating swing of the screening plate 31, fine materials (dust, shredded paper, small plastic particles, etc.) that meet the particle size requirements in the mixed waste fall through the continuous screening channel formed by the screening plate 31 and enter the fine material collection device to complete the screening and collection. Coarse materials (large stones, branches, waste clothing, etc.) that do not meet the particle size requirements are discharged from the discharge end of the screening mechanism 3 along the inclined direction of the equipment under the action of gravity and the inclined structure of the equipment and enter the coarse material processing stage. At the same time, long strips of waste cannot form a stable entanglement in the crisscross swing of the screening plate 31 and are discharged together with the coarse material to avoid jamming the equipment. S5. During the screening process, the screening status of the waste can be observed in real time through the observation window 43 of the protective cover plate 4. The output speed of the drive motor 5 can be adjusted according to the screening effect (the pass rate of fine materials, whether there is entanglement and blockage). In turn, the reciprocating swing frequency of the screening plate 31 can be adjusted to ensure screening efficiency and screening accuracy. If any abnormality is found, the machine can be stopped in time to avoid damage to the equipment.

[0033] Example 2 Based on Example 1, in order to further improve the comprehensiveness of screening, the screening components are arranged as follows: Figures 5 to 7 As shown, the screening plates 31 are arranged in various combinations to improve the comprehensiveness of screening different types of construction waste. A large-scale construction waste recycling plant processes approximately 500 tons of mixed construction waste daily, including: large concrete blocks (particle size > 200mm), crushed stone (50-200mm), fine sand (< 5mm), waste steel bars (long strips, diameter 6-12mm), and waste plastics (sheets / strips). Traditional screening equipment cannot simultaneously meet the needs of screening large materials, filtering fine materials, and preventing long strips from tangling, resulting in low purity of the screened material and affecting the efficiency of resource utilization. Therefore, based on Example 1, a combination of screening plates 31 in various shapes is adopted to improve the comprehensiveness of screening.

[0034] The upper screening plate 31 is set as a wide-spacing arc-shaped screening plate 31A ( Figure 5 The screen has an arc-shaped plate structure, with the screening plate 31A being 25cm wide and the horizontal spacing between adjacent screening plates 31A being 30cm. It is suitable for the initial screening of large concrete blocks and large gravel. The arc-shaped structure guides large materials to slide along the inclined direction of the equipment, avoiding accumulation. The middle screening plate 31B is set in one or two layers. Figure 6 The selection is based on actual needs. Similar to the rectangular screening plate 31 in Example 1, it has a more complete rounded edge, and rectangular blocks are provided between adjacent screening plates 31. The rectangular blocks are 10cm long and 8cm wide; the outer edges of the rectangular blocks are arc-shaped. The middle screening plate 31B separates crushed stone (50-200mm) from fine materials, and the lower screening plate 31C is designed as an anti-winding screening plate 31. Figure 7 A rectangular block is set between adjacent screening plates 31C. The outer arc surface of the rectangular block is set to be reversed and adapted to the arc surface of the screening plate 31C. This can prevent long strips of materials from getting tangled during the swing. For materials such as waste steel bars and long strips of waste plastic, it can break up the long strips of materials and further prevent tangling by swinging left and right. Based on Example 1, only the screening mechanism 3 and the swing transmission mechanism 2 are adjusted as follows: the linkage interface of the swing linkage frame 23 is increased to three or four to adapt to the multi-layer screening plates 31; the length of the secondary linkage frame 24 is slightly adjusted according to the position of each layer of screening plates 31 to ensure that the swing amplitude of each layer of screening plates 31 is consistent; the power of the drive motor 5 is increased to 3kW to adapt to the load requirements of the multi-shaped screening plates 31, and the swing frequency is adjusted to 15 times / minute (to adapt to the sliding speed of large materials).

[0035] Specific screening process: Feeding and preliminary screening (first layer): Mixed construction waste is fed in through the feed port 42 and slides down through the guide plate 12 to the arc-shaped screening plate 31A. Large concrete blocks (>200mm) slide along the arc structure and are discharged from the discharge end, entering the crushing stage; large crushed stones (50-200mm) fall to the second layer through a 30cm interval.

[0036] Graded filtration (second or third layer): Large gravel falls to the second layer (10mm aperture), where it is intercepted and discharged along the inclined direction. Fine sand, dust, etc. fall through the aperture to the third layer (5mm aperture), where fine sand (5-10mm) is intercepted and dust (<5mm) falls through the aperture to the fine material collection box.

[0037] Long strip material processing (bottom layer): Waste steel bars, long strips of waste plastic and other materials slide down from the upper layer to the bottom screening plate 31C, which breaks up the long strip materials and helps to prevent them from getting tangled. Finally, they are discharged together with small gravel and enter the subsequent metal sorting stage.

[0038] Example 3 Based on Example 1, this paper provides a detailed explanation of the implementation process, parameter settings, and application effects of the oscillating waste screening equipment and screening method of the present invention for screening mixed waste at urban and rural domestic waste transfer stations.

[0039] A certain urban and rural domestic waste transfer station processes approximately 300 tons of mixed domestic waste daily. The waste composition is complex, including kitchen waste, waste plastics, branches, broken glass, bricks, and waste clothing. Long, strip-shaped waste (waste plastic ropes, branches, and waste cloth) accounts for about 15%, while fine-particle materials (dust, shredded paper, and rotten kitchen waste particles) account for about 25%. Traditional vibrating screens frequently encounter problems such as long, strip-shaped waste entanglement in the screen mesh and low throughput of fine materials, requiring 5-8 shutdowns per day for cleaning. The screening efficiency is only 15 tons / hour, which is insufficient to meet the transfer station's processing needs. Therefore, the oscillating waste screening equipment of this invention is adopted to replace traditional equipment, achieving efficient grading and screening of mixed domestic waste.

[0040] The specific screening process is as follows: Start the drive motor 5, adjust the swing frequency of the screening plate 31 to 18 times / minute through the frequency converter, run for 30 minutes for no-load debugging, check that there is no jamming or abnormal noise in the main drive shaft 21, transmission connecting rod 22, swing linkage frame 23 and other components, and that the swing amplitude of the screening plate 31 is uniform (about 20mm). After confirming that the equipment is operating normally, connect it to the garbage conveying system of the transfer station.

[0041] The mixed domestic waste from the transfer station is conveyed to the feed port 42 of the protective cover 4 via a conveyor belt. Under the action of gravity, the waste falls onto the guide plate 12 and slides smoothly down the plate, evenly distributing itself on the four layers of staggered screening plates 31. The wear-resistant and anti-slip coating of the guide plate 12 effectively prevents the accumulation of wet and slippery waste, and the feeding speed is stably controlled at 25 tons / hour (adapted to the equipment's processing capacity).

[0042] The drive motor 5 drives the main transmission shaft 21 to rotate, which in turn drives the swing linkage frame 23 to reciprocate left and right through the deformation of the transmission connecting rod 22. The swing linkage frame 23 drives the secondary linkage frame 24 through the linkage interface, which in turn drives the multi-layer screening plates 31 to swing left and right synchronously. During operation, the spring steel material of the transmission connecting rod 22 effectively buffers the impact of hard waste such as bricks and broken glass on the equipment, and the elasticity of the screening plates 31 reduces the rigid collision and wear with the waste.

[0043] Under the alternating oscillation of the screening plates 31, fine-sized materials (dust, shredded paper, and rotten kitchen waste particles) pass through the gaps between the screening plates 31 and fall into the fine material collection box below the equipment. After further processing, they can be used for composting. Larger coarse materials (bricks, large pieces of plastic, branches, and waste clothing) move along the inclined direction of the equipment and are discharged from the discharge end of the screening mechanism 3. Long strips of waste (waste plastic ropes and branches) cannot form stable entanglement under the action of the alternating oscillation of the screening plates 31 and are discharged along with the coarse materials, entering the subsequent manual sorting or resource recovery process. Hard impurities such as broken glass and small stones fall through the screening channel to the bottom of the fine material collection box, where they can be separated by subsequent screening.

[0044] During the screening process, the operator monitors in real time through the observation window 43. When the fine material throughput is low (about 60%), the speed of the drive motor 5 is increased to 1600 rpm through the frequency converter, and the oscillation frequency of the screening plate 31 is adjusted to 22 times / minute, increasing the fine material throughput to 85%. After running for 4 hours, a small amount of kitchen waste is found on the surface of some screening plates 31 through the observation window 43. After stopping the machine, the protective cover 4 is opened and a high-pressure water gun is used for quick cleaning. The cleaning time is only 15 minutes, which is much shorter than the cleaning time of traditional equipment.

[0045] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An environmentally friendly swing sifting device, characterized by, The utility model provides a kind of screening device, including: Supporting mechanism, including oppositely arranged side support plate and material guiding inclined plate;The material guiding inclined plate is connected between two side support plates, and the material guiding inclined plate is located at the equipment feed end, to carry out the guidance of material to be screened; Screening mechanism, erected between two side support plates, internally provided with several screening components in preset state distribution; Swing transmission mechanism, transmission connection with driving motor, the swing transmission mechanism is used to drive screening component to carry out reciprocating swing; Protective cover plate is provided with feed port and observation window, the feed port corresponds with the feed position of material guiding inclined plate; The whole equipment is set to be inclined at predetermined angle, and the screening of different particle size materials is realized by the reciprocating swing of screening component.

2. The swing sifting device for environmental protection according to claim 1, characterized in that, The screening component is set as screening piece, and several screening pieces are distributed in preset state in turn staggered, and the reciprocating swing direction of screening piece is set as left and right swing.

3. The swing sifting device for environmental protection according to claim 1, characterized in that, The swing transmission mechanism includes: Main transmission rod shaft, transmission connection with the output end of driving motor; Swing linkage frame, linkage with main transmission rod shaft through transmission connecting rod; Secondary linkage frame, connected with swing linkage frame through transmission connecting piece; The swing linkage frame and the secondary linkage frame are transmission connection with the screening component.

4. The swing sifting device for environmental protection according to claim 3, characterized in that, When the main transmission rod shaft rotates, transmission connecting rod is deformed, and then drive swing linkage frame, transmission connecting piece and secondary linkage frame synchronous transmission, so as to drive screening component to realize reciprocating swing.

5. The swing sifting device for environmental protection according to claim 1, characterized in that, The inclination angle of material guiding inclined plate is consistent with the predetermined inclination angle of the whole equipment, and the discharge end of material guiding inclined plate extends above the screening component of screening mechanism.

6. The swing sifting device for environmental protection according to claim 1, characterized in that, The screening piece is in plate structure, the length direction is parallel with the inclination direction of equipment, the edge of screening piece is provided with smooth transition chamfer structure, and several screening pieces are arranged in height direction in screening mechanism, and the staggered direction of adjacent two layers of screening pieces is opposite, forming continuous screening channel.

7. The swing sifting device for environmental protection according to claim 2, characterized in that, A plurality of linkage interfaces are arranged on the swing linkage frame in height direction, one end of the secondary linkage frame is connected with one linkage interface of the swing linkage frame, and the other end is transmission connection with the screening piece of corresponding height layer;Through synchronous driving of swing linkage frame, the synchronous reciprocating swing driving of screening pieces of different heights is realized.

8. The swing sifting device for environmental protection according to claim 6, characterized in that, The screening piece is combined and arranged in multiple forms, including at least wide-spacing arc-shaped screening piece, rectangular screening piece and anti-winding screening piece from top to bottom;The wide-spacing arc-shaped screening piece is in arc-shaped plate structure;The middle layer rectangular screening piece is in rectangular plate shape and the edge is circular arc edge, and rectangular block with arc-shaped outer side is arranged between adjacent middle layer rectangular screening pieces;Anti-winding screening piece is arranged with rectangular block between adjacent anti-winding screening pieces, and the outer side arc surface of the rectangular block is reversely adapted with the arc surface of the anti-winding screening piece.

9. A screening method for an environmentally friendly swing screening apparatus according to any one of claims 1 to 8, characterized in that, The utility model provides a kind of screening device, including: S1, the material to be screened is put in through the feed port of protective cover plate, and the material is guided to the screening piece on the screening mechanism in layered and staggered distribution along the inclination direction of equipment by material guiding inclined plate; S2, start driving motor, driving motor drives the rotation of the main transmission rod shaft of swing transmission mechanism, and the main transmission rod shaft drives the deformation of transmission connecting rod in the process of rotation, and then drives the synchronous movement of swing linkage frame; S3. The swing linkage frame synchronously drives multiple secondary linkage frames connected to it through multiple linkage interfaces set along the height direction. Each secondary linkage frame drives the screening plate of the corresponding height layer to swing back and forth. S4. Under the reciprocating swing of the screening plates, the material that meets the particle size requirements falls through the continuous screening channel formed by the screening plates, while the material that does not meet the particle size requirements is discharged from the discharge end of the screening mechanism along the inclined direction of the equipment. The long strip material is prevented from getting tangled in the crisscross swing of the screening plates. S5. During the screening process, the screening status of the material is observed in real time through the observation window of the protective cover. The output speed of the drive motor is adjusted according to the screening effect, thereby adjusting the reciprocating oscillation frequency of the screening plate to ensure screening efficiency.

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