High-sludge stale garbage screening device

Abstract

The utility model relates to the technical field of screening devices, and discloses a high-sludge stale garbage screening device which comprises a composite screening part, a manual sorting part, a light screening part and a heavy screening part, and the manual sorting part, the light screening part and the heavy screening part are respectively connected with the composite screening part. The composite sieve comprises a box body, a plurality of upper sieve plates and a plurality of lower sieve plates, the upper sieve plates and the lower sieve plates are arranged in the box body, each upper sieve plate comprises a frame and a plurality of partition plates arranged in the frame, and pendulum bobs rotationally connected with the partition plates are arranged on the partition plates; the device can screen the high-sludge stale garbage into heavy substances with the particle size larger than 60 mm, light substances with the particle size smaller than 60 mm and larger than 30 mm and sludge with the particle size smaller than 30 mm, the heavy substances can serve as backfill materials to be recycled, the light substances can be incinerated, the sludge can serve as greening humus soil, and the greening humus soil can serve as greening humus soil. The high-sludge stale garbage is efficiently screened and recycled, the resource utilization rate is high, and the greening humus soil yield is high.

Description

Technical Field

[0001] The utility model relates to the technical field of screening devices, in particular to a high-silt stale garbage screening device. Background Art

[0002] Stale garbage refers to the garbage stock in landfills. Due to the lagging economic development in some areas, some landfills are not set up in a standardized manner, which has a serious impact on the surrounding soil, groundwater, surface water and other ecological environments, resulting in the landfill being unable to be used again, causing a large amount of land resources to be occupied. Therefore, in order to release these occupied landfills, the existing technology proposes to screen and treat the stale garbage in the landfill.

[0003] At present, the stale garbage screening technology in the prior art mainly adopts the combination of a drum and an air separator. The stale garbage in the landfill contains some high-silt stale garbage, which is buried in the soil and poses a great threat to the soil. However, the traditional drum and air separator combination cannot effectively screen the high-silt stale garbage. Therefore, it is necessary to optimize the process for the high-silt stale garbage. The prior art discloses that the screening treatment of sludge materials often adopts a relaxation screen, which can peel off the silt adhering to the screen, thereby preventing the relaxation screen from being stuck to the screen. The screen of the loose screen is blocked by silt, such as a loose screen disclosed in publication number CN110369270B. The device is equipped with multiple sieve plates and can process materials of multiple particle sizes at one time for screening. At present, the silt in high-silt stale garbage will adhere to the surface of other materials. The screening device in the prior art cannot effectively peel off and screen this part of the silt. When the silt is screened to a particle size below 30 mm, it can be used as humus for greening. Therefore, peeling and screening the silt during the screening process can significantly improve the resource utilization efficiency of the stale garbage. Summary of the invention

[0004] In order to overcome the problem in the prior art that high-silt stale garbage is difficult to handle and the sludge attached to the surface of the garbage is difficult to peel off by the tension screen, the utility model provides a high-silt stale garbage screening device, the device consists of a manual sorting part, a composite screen, a light screening part and a heavy screening part, the composite screen in the device is provided with an upper screen and a lower screen, which can screen the high-silt stale garbage into humus with a particle size of less than 30 mm, combustible light materials with a particle size of 30-60 mm and heavy materials above 60 mm, the upper screen separates materials with a particle size of less than 60 mm, and a pendulum is provided on the upper screen, which can hammer light materials of 30 to 60 mm, and can efficiently peel off the silt attached to the surface of the light materials, thereby improving the screening efficiency of the sludge.

[0005] The specific technical scheme of the present invention is:

[0006] A high-silt stale garbage screening device is characterized in that it includes a composite screening section and a manual sorting section, a light screening section and a heavy screening section respectively connected to the composite screening section, the composite screening section includes a composite screen, the composite screen includes a screen body, a plurality of upper screen plates and a plurality of lower screen plates arranged in the screen body, the upper screen plate includes a frame and a plurality of partitions arranged in the frame, and the partition is provided with a pendulum rotatably connected to the partition.

[0007] The utility model provides a high-silt stale garbage screening device, which consists of a manual sorting part, a composite screen composite screening part, a light screening part and a heavy screening part. The composite screening part includes a composite screen, the upper screen plate of the composite screen is a vibrating screen plate, and the lower screen plate is a relaxation screen plate. The upper screen plate and the lower screen plate are used in combination to screen heavy particles with a particle size of more than 60mm, light particles with a particle size of 30-60mm and sludge below 30mm. The upper screen plate of the present application is a vibrating screen, which can perform transverse reciprocating motion under the action of a transmission component. The upper screen plate is composed of a plurality of partitions, and the gaps formed between the partitions can play a screening role, so that light materials and sludge with a particle size of less than 60mm can pass through the gaps, while heavy materials with a particle size of more than 60mm can remain on the upper screen plate, thereby realizing the separation of heavy materials. In addition, since the light materials and sludge enter between the upper screen plate and the lower screen plate together, the movement of the traditional relaxation screen will The silt and light objects are bounced up, but due to the light weight of the light objects, it is difficult to separate the silt and the light objects when they are bounced up. The silt will adhere to and wrap the light objects, making it impossible to efficiently separate the light objects from the attached silt. Therefore, the present application provides a pendulum on the partition of the upper screen plate, and the pendulum will swing when the upper screen plate is making a lateral reciprocating motion. When the mixture of silt and light objects passes through the partition and enters the space between the upper screen plate and the lower screen plate, the swing of the pendulum will hammer the mixture of light objects and silt to separate the mixture of light object particles and silt. At the same time, the silt has high fluidity and is heavier, so the silt will sink to the surface of the lower screen plate first, and the light objects will be deposited on the surface of the silt. In addition, when the relaxation screen bounces the deposited silt again, it will be hammered again under the action of the pendulum. During the screening process, the attached objects on the surface of the light objects can be peeled off many times, so that the light objects and silt can be effectively separated.

[0008] Preferably, the pendulum includes a hammer body and a bearing arranged on the hammer body, and the partition includes a plate body, a plurality of support ends located at the top of the plate body and a plurality of grooves located at the bottom of the partition and matching the pendulum, a rotating shaft is provided in the groove, and the rotating shaft is rotatably connected to the bearing.

[0009] The pendulum of the present application is rotatably connected to the rotating shaft on the partition through the bearing, so that the pendulum can rotate around the rotating shaft.

[0010] Preferably, the composite screen is provided with a light screening piece connected to the light screening part, a heavy screening piece connected to the heavy screening part and a first humus soil output piece, and the heavy screening piece is provided with a first magnetic separator.

[0011] Preferably, the manual sorting section comprises a first belt member connected to the composite screening section, a front-end conveying member connected to the first belt member, and a manual sorting platform.

[0012] Preferably, the lightweight screening part comprises a lightweight air selection member connected to the composite screen, and the lightweight air selection member is provided with a lightweight output member and a second humus soil output member.

[0013] Preferably, the heavy mass screening section comprises a first heavy mass air selection element and a second belt element connecting the heavy mass air selection element and the composite screening section.

[0014] Preferably, the heavy-weight screening part is provided with a heavy-weight output component and a second humus soil output component, and the heavy-weight output component is provided with a second magnetic selection component.

[0015] Preferably, the screening particle size of the upper sieve plate is greater than 60 mm.

[0016] Preferably, the screening particle size of the lower sieve plate is less than 30 mm.

[0017] Preferably, the lower screen plate is a polyurethane relaxation screen.

[0018] Compared with the prior art, this application has the following technical effects:

[0019] The device can screen high-silt stale garbage into heavy materials with a particle size greater than 60mm, light materials with a particle size less than 60mm and greater than 30mm, and silt with a particle size less than 30mm. The heavy materials can be reused as backfill, the light materials can be incinerated, and the silt can be used as greening humus soil. The high-silt stale garbage can be efficiently screened and recycled, with a high resource utilization rate.

[0020] The composite screening part of the device adopts a composite screen. The composite screen adopts a vibrating screen as the upper screen plate and a tension screen as the lower screen plate. The composite screen can realize the screening of materials in three particle ranges. In addition, a pendulum rotatably connected to the upper screen plate is provided on the upper screen plate. By setting the pendulum, the mixture of silt and light matter can be hammered to separate the light matter and silt that are more difficult to separate. In addition, the pendulum will hammer the light matter and silt bounced up by the tension screen for the second time, so as to peel off the silt on the surface of the light matter and crush the silt at the same time, which significantly improves the separation efficiency of light matter and silt. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model.

[0022] Figure 2 It is a structural schematic diagram of the composite screen of the utility model.

[0023] Figure 3 It is a structural schematic diagram of the upper screen of the utility model.

[0024] Figure 4 It is a partial structural schematic diagram of the upper screen plate of the utility model.

[0025] Figure 5 It is a structural schematic diagram of the lower screen plate of the utility model.

[0026] In the figure, the composite screening part 1, the composite screen 101, the box 111, the upper screen plate 112, the frame 121, the partition 122, the support end 1221, the groove 1222, the rotating shaft 1223, the pendulum 123, the hammer 1231, the bearing 1232, the lower screen plate 113, the screen body 1131, the relaxation screen hole 1132, the clamping end 1133, the fixing hole 1134, the light screening piece 102, the heavy screening piece 103, the first humus Soil output element 104, first magnetic selection element 105, manual sorting section 2, first belt element 201, front end conveying element 202, manual sorting platform 203, light screening section 3, light air selection element 301, light output element 311, second humus soil output element 312, heavy screening section 4, heavy air selection element 401, heavy output element 411, second humus soil output element 412, second magnetic selection element 413 and second belt element 402. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the embodiments.

[0028] Embodiment 1:

[0029] like Figure 1As shown, a high-silt stale garbage screening device comprises a composite screening part 1 and a manual sorting part 2, a light screening part 3 and a heavy screening part 4 respectively connected to the composite screening part, the manual sorting part comprises a first belt member 201, a front end conveying member 202 and a manual sorting platform 203, the front end conveying member is a plate chain conveyor, the first belt member is a belt conveyor, the manual sorting platform is located on one side of the first belt member, the front end of the first belt member is connected to the front end conveying member, the rear end of the first belt member is connected to the composite screening part, the composite screening part comprises a composite screen 101, a light screening member 102, a heavy screening member 103 and a first humus output member 104 are provided on the composite screen, and the heavy screening member 104 is provided on the composite screen. A first magnetic separation element 105 is arranged on the component, and the first magnetic separation element is a magnetic separator. The light screening element is connected with the light screening part. The light screening part includes a light air separation element 301. The light air separation element is provided with a light output element 311 and a second humus output element 312. The light air separation element is a wind separator. The heavy screening element is connected with the heavy screening part. The heavy screening part includes a first heavy air separation element 401 and a second belt element 402. The second belt element connects the heavy air separation element and the heavy screening element. The heavy screening element is a 3D wind separator. The heavy screening element is provided with a heavy output element 411 and a second humus output element 412. The heavy output element is provided with a second magnetic separation element 413. The second magnetic separation element is a magnetic separator.

[0030] like Figure 2 As shown, the composite screen includes a box body 111, a plurality of upper sieve plates 112 and a plurality of lower sieve plates 113 arranged in the box body, the box body is a banana-shaped box body, the upper sieve plates and the lower sieve plates are arranged along the curvature of the box body, the curvature formed by the upper sieve plates and the lower sieve plates is gradually reduced, the upper sieve plates are arranged on the upper sieve plate frame at the top of the box body, the upper sieve plates are arranged in four rows and six columns in parallel, the lower sieve plates are arranged at the lower part of the lower sieve plates and form a certain space with the upper sieve plates, the lower sieve plates are arranged in six columns in parallel, the upper sieve plates and the lower sieve plates of the composite screen are powered by one driver, and a shock absorber is provided at the bottom of the box body.

[0031] like Figure 3 and Figure 4 As shown, the upper screen plate includes a frame 121 and a plurality of parallel partitions 122 arranged in the frame. The frame is a rectangular frame. The number of partitions is 13. The top of the partition is provided with a plurality of support ends 1221. The number of support ends is 7. The support ends are arc-shaped, and adjacent support ends form intervals. The bottom end of the partition is provided with a plurality of grooves 1222. A rotating shaft 1223 is provided inside the groove. The rotating shaft is provided with a pendulum 123 rotatably connected to the rotating shaft. The pendulum includes a hammer body 1231 and a bearing 1232 arranged on the hammer body. The hammer body is a rectangular parallelepiped. The bearing is rotatably connected to the rotating shaft. Each partition is provided with 40 grooves and a pendulum corresponding to the grooves at the bottom.

[0032] like Figure 5As shown, the lower sieve plate is a polyurethane loose sieve, which includes a sieve body 1131 and a plurality of loose sieve holes 1132 arranged on the sieve body. The sieve body is a rectangular sheet, the screening particle size of the loose sieve holes is 30 mm, the loose sieve holes are rectangular through holes, and a clamping end 1133 and a fixing hole 1134 are provided on the sieve body. The clamping end, the fixing hole and the crossbeam of the composite sieve are detachably connected.

[0033] Embodiment 2:

[0034] like Figure 1 As shown, a high-silt stale garbage screening device comprises a composite screening part 1 and a manual sorting part 2, a light screening part 3 and a heavy screening part 4 respectively connected to the composite screening part, the manual sorting part comprises a first belt member 201, a front end conveying member 202 and a manual sorting platform 203, the front end conveying member is a plate chain conveyor, the first belt member is a belt conveyor, the manual sorting platform is located on one side of the first belt member, the front end of the first belt member is connected to the front end conveying member, the rear end of the first belt member is connected to the composite screening part, the composite screening part comprises a composite screen 101, a light screening member 102, a heavy screening member 103 and a first humus output member 104 are provided on the composite screen, and the heavy screening member 104 is provided on the composite screen. A first magnetic separation element 105 is arranged on the component, and the first magnetic separation element is a magnetic separator. The light screening element is connected with the light screening part. The light screening part includes a light air separation element 301. The light air separation element is provided with a light output element 311 and a second humus output element 312. The light air separation element is a wind separator. The heavy screening element is connected with the heavy screening part. The heavy screening part includes a first heavy air separation element 401 and a second belt element 402. The second belt element connects the heavy air separation element and the heavy screening element. The heavy screening element is a 3D wind separator. The heavy screening element is provided with a heavy output element 411 and a second humus output element 412. The heavy output element is provided with a second magnetic separation element 413. The second magnetic separation element is a magnetic separator.

[0035] like Figure 2 As shown, the composite screen includes a box body 111, a plurality of upper sieve plates 112 and a plurality of lower sieve plates 113 arranged in the box body, the box body is a banana-shaped box body, the upper sieve plates and the lower sieve plates are arranged along the curvature of the box body, the curvature formed by the upper sieve plates and the lower sieve plates is gradually reduced, the upper sieve plate is arranged on the upper sieve plate frame at the top of the box body, the upper sieve plates are arranged in four rows and seven columns in parallel, the lower sieve plates are arranged at the lower part of the lower sieve plates and form a certain space with the upper sieve plates, the lower sieve plates are arranged in seven columns in parallel, the upper sieve plates and the lower sieve plates of the composite screen are powered by a driver, and a shock absorber is provided at the bottom of the box body.

[0036] like Figure 3 and Figure 4As shown, the upper screen plate includes a frame 121 and a plurality of parallel partitions 122 arranged in the frame. The frame is a rectangular frame. The number of partitions is 13. The top of the partition is provided with a plurality of support ends 1221. The number of support ends is 7. The support ends are arc-shaped, and adjacent support ends form intervals. The bottom end of the partition is provided with a plurality of grooves 1222. A rotating shaft 1223 is provided inside the groove. The rotating shaft is provided with a pendulum 123 rotatably connected to the rotating shaft. The pendulum includes a hammer body 1231 and a bearing 1232 arranged on the hammer body. The hammer body is a rectangular parallelepiped. The bearing is rotatably connected to the rotating shaft. Each partition is provided with 40 grooves and a pendulum corresponding to the grooves at the bottom.

[0037] like Figure 5 As shown, the lower sieve plate is a polyurethane loose sieve, which includes a sieve body 1131 and a plurality of loose sieve holes 1132 arranged on the sieve body. The sieve body is a rectangular sheet, the screening particle size of the loose sieve holes is 30 mm, the loose sieve holes are rectangular through holes, and a clamping end 1133 and a fixing hole 1134 are provided on the sieve body. The clamping end, the fixing hole and the crossbeam of the composite sieve are detachably connected.

[0038] Embodiment 3:

[0039] like Figure 1 As shown, a high-silt stale garbage screening device comprises a composite screening part 1 and a manual sorting part 2, a light screening part 3 and a heavy screening part 4 respectively connected to the composite screening part, the manual sorting part comprises a first belt member 201, a front end conveying member 202 and a manual sorting platform 203, the front end conveying member is a plate chain conveyor, the first belt member is a belt conveyor, the manual sorting platform is located on one side of the first belt member, the front end of the first belt member is connected to the front end conveying member, the rear end of the first belt member is connected to the composite screening part, the composite screening part comprises a composite screen 101, a light screening member 102, a heavy screening member 103 and a first humus output member 104 are provided on the composite screen, and the heavy screening member 104 is provided on the composite screen. A first magnetic separation element 105 is arranged on the component, and the first magnetic separation element is a magnetic separator. The light screening element is connected with the light screening part. The light screening part includes a light air separation element 301. The light air separation element is provided with a light output element 311 and a second humus output element 312. The light air separation element is a wind separator. The heavy screening element is connected with the heavy screening part. The heavy screening part includes a first heavy air separation element 401 and a second belt element 402. The second belt element connects the heavy air separation element and the heavy screening element. The heavy screening element is a 3D wind separator. The heavy screening element is provided with a heavy output element 411 and a second humus output element 412. The heavy output element is provided with a second magnetic separation element 413. The second magnetic separation element is a magnetic separator.

[0040] like Figure 2As shown, the composite screen includes a box body 111, a plurality of upper sieve plates 112 and a plurality of lower sieve plates 113 arranged in the box body, the box body is a banana-shaped box body, the upper sieve plates and the lower sieve plates are arranged along the curvature of the box body, the curvature formed by the upper sieve plates and the lower sieve plates is gradually reduced, the upper sieve plate is arranged on the upper sieve plate frame at the top of the box body, the upper sieve plates are arranged in three rows and eight columns in parallel, the lower sieve plates are arranged at the lower part of the lower sieve plates and form a certain space with the upper sieve plates, the lower sieve plates are arranged in eight columns in parallel, the upper sieve plates and the lower sieve plates of the composite screen are powered by one driver, and a shock absorber is provided at the bottom of the box body.

[0041] like Figure 3 and Figure 4 As shown, the upper screen plate includes a frame 121 and a plurality of parallel partitions 122 arranged in the frame. The frame is a rectangular frame. The number of partitions is 13. The top of the partition is provided with a plurality of support ends 1221. The number of support ends is 7. The support ends are arc-shaped, and adjacent support ends form intervals. The bottom end of the partition is provided with a plurality of grooves 1222. A rotating shaft 1223 is provided inside the groove. The rotating shaft is provided with a pendulum 123 rotatably connected to the rotating shaft. The pendulum includes a hammer body 1231 and a bearing 1232 arranged on the hammer body. The hammer body is a rectangular parallelepiped. The bearing is rotatably connected to the rotating shaft. Each partition is provided with 40 grooves and a pendulum corresponding to the grooves at the bottom.

[0042] like Figure 5 As shown, the lower sieve plate is a polyurethane loose sieve, which includes a sieve body 1131 and a plurality of loose sieve holes 1132 arranged on the sieve body. The sieve body is a rectangular sheet, the screening particle size of the loose sieve holes is 30 mm, the loose sieve holes are rectangular through holes, and a clamping end 1133 and a fixing hole 1134 are provided on the sieve body. The clamping end, the fixing hole and the crossbeam of the composite sieve are detachably connected.

[0043] Embodiment 4:

[0044] The application of the high-silt stale garbage screening device in processing high-silt stale garbage includes the following steps: using an excavation device to transfer the high-silt stale garbage in a landfill to the high-silt stale garbage screening device, placing the high-silt stale garbage on a plate chain conveyor, the plate chain conveyor transports the high-silt fluorine-precipitated garbage to a first belt member, a sorting operator sorts the high-silt stale garbage on the first belt member, picks out large pieces of stones and other objects, and the sorted high-silt stale garbage is transported to the top of the composite screen through the first belt;

[0045] The high-silt stale garbage moves from the top of the composite screen to the arc of the composite screen, and is screened by the upper and lower screen plates. The particles with a screening size greater than 60 mm are heavy objects, which are output from the heavy object screening piece to the second belt piece and screened by the magnetic separator. The heavy objects on the second belt piece are transported to the heavy screening piece. The particles with a screening size of 30 mm to 60 mm are light objects, which are output from the light screening piece to the light air selection piece. The particles with a screening size less than 30 mm are humus soil, which is screened by the composite screen and output by the first humus soil output piece.

[0046] The light material obtained by the composite screen also contains a small amount of silt. After this part of the light material enters the light air selection part, the light air selection part obtains relatively clean light material and a small amount of humus soil after air selection and screening. The light material is output through the light output part and collected for light material processing, and a small amount of humus soil is output through the second humus soil output part and collected;

[0047] The heavy material obtained by the composite screen still contains a small amount of silt. This part of the heavy material enters the heavy air selection element and is screened by 3D air selection to obtain relatively clean heavy material and a small amount of humus. The heavy material is output through the heavy output element and the magnetic material is screened again through the magnetic selection element. A small amount of humus is output through the third humus output element and collected.

[0048] Comparative Example 1:

[0049] Compared with the embodiment, the comparative example 1 does not have a pendulum, and the other conditions are the same as those of the embodiment.

[0050] The high-silt stale garbage screening devices of Examples 1 to 3 and Comparative Example 1 were used to screen high-silt stale garbage with moisture contents of 30%, 40% and 50%, and the recovery rate of the humus finally obtained was calculated. After calculation, the humus yield per kilogram of Examples 1 to 3 can reach 85-92%, and the humus yield per kilogram of Comparative Example 1 is 65-80%. In addition, the higher the water content, the lower the humus yield of Comparative Example 1, while the high-silt stale garbage screening devices provided in Examples 1 to 3 can still achieve a humus yield of more than 85% at high moisture contents.

Claims

1. A high-silt stale garbage screening device, characterized in that: The invention comprises a composite screening section (1), and a manual sorting section (2), a light screening section (3), and a heavy screening section (4) respectively connected to the composite screening section, wherein the composite screening section comprises a composite screen (101), the composite screen comprises a box body (111), a plurality of upper screen plates (112) and a plurality of lower screen plates (113) arranged in the box body, the upper screen plate comprises a frame (121) and a plurality of partition plates (122) arranged in the frame, and the partition plates are provided with pendulums (123) rotatably connected to the partition plates.

2. A high-silt stale garbage screening device according to claim 1, characterized in that: The pendulum comprises a hammer body (1231) and a bearing (1232) arranged on the hammer body, and the partition comprises a plate body (1221), a plurality of support ends (1222) located on the plate body at the top of the partition, and a plurality of grooves (1223) located at the bottom of the partition and matching the pendulum, wherein a rotating shaft (1224) is arranged in the groove, and the rotating shaft is rotatably connected to the bearing.

3. A high-silt stale garbage screening device according to claim 1, characterized in that: The composite screen is provided with a light screening piece (102) connected to the light screening part, a heavy screening piece (103) connected to the heavy screening part, and a first humus soil output piece (104), and the heavy screening piece is provided with a first magnetic selection piece (105).

4. A high-silt stale garbage screening device according to claim 1, characterized in that: The manual sorting section comprises a first belt member (201) connected to the composite screening section, a front-end conveying member (202) connected to the first belt member, and a manual sorting platform (203).

5. The high-silt stale garbage screening device according to claim 1 is characterized in that: The light screening section comprises a light air selection component (301) connected to a composite screen, and the light air selection component is provided with a light output component (311) and a second humus soil output component (312).

6. A high-silt stale garbage screening device according to claim 1, characterized in that: The heavy-mass screening section comprises a first heavy-mass air selection element (401) and a second belt element (402) connecting the heavy-mass air selection element and the composite screening section.

7. A high-silt stale garbage screening device according to claim 5, characterized in that: The heavy-mass screening section is provided with a heavy-mass output component (411) and a second humus soil output component (412), and the heavy-mass output component is provided with a second magnetic selection component (413).

8. The high-silt stale garbage screening device according to claim 1 is characterized in that: The screening particle size of the upper sieve plate is greater than 60 mm.

9. The high-silt stale garbage screening device according to claim 1 is characterized in that: The screening particle size of the lower sieve plate is less than 30 mm.

10. A high-silt stale garbage screening device according to claim 1 or 9, characterized in that: The lower screen plate is a polyurethane relaxation screen.

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