Outdoor modular multi-stage screening device

Abstract

The utility model relates to the technical field of building construction, in particular to an outdoor modular multi-stage screening device which comprises a supporting plate, a multi-stage screen assembly and a vibration mechanism. The supporting plate is provided with a plurality of guide holes, the multi-stage screen assembly is provided with standard screens, and the periphery of each standard screen is provided with a lug part. The vibrating mechanism comprises a vibrating plate, a connecting guide rod, a vibrating spring and a driving module, the connecting guide rod is provided with a shaft shoulder, the two sides of the connecting guide rod are a connecting rod part and a guide rod part respectively, the connecting rod part penetrates through the standard screen lug part, and the guide rod part is inserted into the guide hole. The vibrating plate is slidably connected with the guide rod portion, the vibrating spring sleeves two ends of the guide rod portion and abuts against the vibrating plate and the support plate respectively, and the outer contour of a cam of the driving module abuts against the vibrating plate. The cam rotates to push the vibrating plate to drive the connecting guide rod and the standard screens of all levels to vibrate synchronously. Materials are placed on the multi-stage screen assembly, graded screening is achieved through the corresponding screens under vibration according to the particle size, and the design is good in portability.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, and more specifically, to an outdoor modular multi-stage screening device. Background Technology

[0002] The main components of asphalt concrete are asphalt and aggregates. Aggregates can be divided into coarse aggregates and fine aggregates. Coarse aggregates act as the skeleton in asphalt concrete, constructing the main structure of the entire pavement, while fine aggregates fill the gaps between the coarse aggregates, reinforcing the overall structure. Aggregate gradation refers to the proportion of aggregates of different particle sizes, generally calculated by weight. Aggregate gradation has a certain impact on the permeability of the road, the compressive strength of the concrete, the fracture properties of the concrete, and its skid resistance.

[0003] In actual road construction, it is necessary to analyze the gradation ratio of aggregates. The gradation ratio is the proportion of aggregates in each particle size range. Testing and optimizing the gradation can avoid accidents and economic losses caused by these problems and extend the service life of roads. Currently, the analysis of aggregate gradation ratios is usually carried out in the laboratory by screening aggregates on a vibrating table. Since most construction sites are usually in remote outdoor areas, the cycle of sending samples to the laboratory is long, which prolongs the construction period and increases construction costs. On-site testing requires consideration of power supply and transportation issues of the vibrating table. Therefore, it is necessary to propose a portable outdoor screening device to reduce construction costs. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an outdoor modular multi-stage screening device, aiming to provide a portable outdoor screening device to reduce construction costs.

[0005] An outdoor modular multi-stage screening device according to an embodiment of the present invention includes:

[0006] A support plate, wherein a plurality of guide holes are provided on the support plate;

[0007] A multi-stage screen assembly, wherein at least two standard screens are provided in the vertical direction; the mesh count of the standard screens gradually increases downward in the vertical direction; and each standard screen has several ears on its outer periphery.

[0008] The vibration mechanism includes a vibrating plate, a connecting guide rod, a vibration spring, and a drive module. The connecting guide rod has a shoulder, with a connecting rod portion on one side and a guide rod portion on the other side. The connecting rod portion passes sequentially through the ears of all the standard screens in the vertical direction, and the guide rod portion is inserted into the guide hole. The vibrating plate and the guide rod portion are slidably connected. One side of the vibrating plate abuts against the shoulder. The vibration spring is sleeved on the guide rod portion, with one end abutting against the vibrating plate and the other end abutting against the support plate. The drive module has a cam, the outer contour of which abuts against the vibrating plate.

[0009] According to some embodiments of the present invention, the drive module includes a housing, a primary gear set, a secondary gear set, and a drive shaft; the primary gear set and the secondary gear set are disposed within the housing, and the housing and the support plate are detachably connected; the drive shaft is drivenly connected to the primary gear set, the output end of the primary gear set is drivenly connected to the input end of the secondary gear set, and the output end of the secondary gear set is drivenly connected to the cam.

[0010] According to some embodiments of the present invention, the primary gear set includes a first bevel gear, a second bevel gear, and a first drive shaft. The two sides of the first drive shaft are rotatably mounted on the outer casing via bearings with mounting seats. The first bevel gear is fixedly connected to the drive shaft, and the second bevel gear is fixedly connected to the first drive shaft. The first bevel gear and the second bevel gear mesh, and the transmission ratio between the first bevel gear and the second bevel gear is 1:1.

[0011] According to some embodiments of the present invention, the secondary gear set includes a first spur gear, a second spur gear, and a second transmission shaft. The second transmission shaft is rotatably mounted on the outer casing via a bearing with a mounting seat. The first spur gear and the first transmission shaft are fixedly connected, and the second spur gear and the second transmission shaft are fixedly connected. The first spur gear meshes with the second spur gear. One end of the second transmission shaft passes through the outer casing and is detachably connected to the cam.

[0012] According to some embodiments of the present invention, the transmission ratio between the first spur gear and the second spur gear is 1:n, where 2≤n≤5.

[0013] According to some embodiments of the present invention, the second drive shaft and the cam are connected by a spline.

[0014] According to some embodiments of the present invention, one end of the drive shaft is provided with an L-shaped rocker arm.

[0015] According to some embodiments of this utility model, the connecting guide rod is made of aluminum alloy and has a hollow structure.

[0016] According to some embodiments of the present invention, the lower end of the support plate is provided with at least three support feet; all of the support feet are threadedly connected to the support plate.

[0017] According to some embodiments of this utility model, the support foot has a tapered structure.

[0018] An outdoor modular multi-stage screening device according to an embodiment of the present invention has at least the following beneficial effects:

[0019] According to the present invention, during operation, the cam in the drive module begins to rotate. Since the outer contour of the cam is not a regular circle, as the cam rotates, its outer contour contacts the vibrating plate and pushes it. The cam pushes the vibrating plate to reciprocate linearly along the guide rod. Because one side of the vibrating plate abuts against the shaft shoulder, the entire connecting guide rod moves together with the vibrating plate under the push of the cam. The connecting rod of the connecting guide rod passes through the ears of all the standard screens in sequence. When the connecting guide rod moves, it drives the standard screens at each level to vibrate synchronously. The material to be screened is placed on the multi-stage screen assembly. Under the vibration of the screens, materials of different particle sizes will pass through the corresponding mesh sizes of the standard screens, achieving grading and screening according to particle size. Smaller particle sizes will pass through the lower screen with a larger mesh size, while larger particle sizes will remain on the upper screen with a smaller mesh size. In this embodiment, the multi-stage screening assembly is equipped with at least two standard screens in the vertical direction, and the mesh size gradually increases downwards in the vertical direction. This allows for multi-stage screening of materials in one go, separating materials of different particle size ranges simultaneously. Compared with single-stage screening equipment, this greatly improves screening efficiency.

[0020] According to the present invention, the connecting rod is separated into a connecting rod part and a guide rod part by a shoulder. The connecting rod part is connected to the screen, and the guide rod part is inserted into the guide hole of the support plate, which provides a stable guiding effect for the vibration of the connecting rod and the entire screen assembly. At the same time, the vibration spring is sleeved on the guide rod part, which not only plays a role in buffering and damping vibration, but also further enhances the stability of the entire vibration system, ensuring that the equipment can operate stably for a long time.

[0021] According to the present invention, the vibrating plate is driven by a cam, which in turn drives the connecting guide rod and the screen to vibrate. This driving method can generate relatively stable and continuous vibration, which is beneficial for the material to be fully dispersed and screened on the screen, thereby improving the screening accuracy.

[0022] According to the present invention, each standard screen is provided with an ear on its outer periphery, and the screen is connected by a connecting rod passing through the ear in sequence. This structural design makes the installation and disassembly of the screen convenient, facilitates regular inspection, cleaning or replacement of the screen, and reduces the maintenance cost of the equipment. At the same time, the vibration mechanism adopts a modular design, which is convenient to use and quick to install, improving the portability of the device. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0025] Figure 3 For the present utility model Figure 2 A magnified schematic diagram of the local structure at point A;

[0026] Figure 4 This is a schematic diagram of the drive module of this utility model.

[0027] In the picture:

[0028] 100 - Support plate, 110 - Guide hole, 120 - Support foot;

[0029] 200 - Multi-stage screen assembly, 210 - Standard screen, 211 - Ear;

[0030] 300-Vibration mechanism, 310-Vibration plate, 320-Connecting guide rod, 321-Shoulder, 322-Connecting rod part, 323-Guide rod part, 330-Vibration spring;

[0031] 400-Drive module, 410-Cam, 420-Housing housing, 430-First stage gear set, 431-First bevel gear, 432-Second bevel gear, 433-First drive shaft, 440-Second stage gear set, 441-First spur gear, 442-Second spur gear, 443-Second drive shaft, 450-Drive shaft, 451-L-type rocker arm, 460-Bearing with mounting bracket. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0035] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0036] Reference Figures 1 to 4 As shown, this utility model discloses an outdoor modular multi-stage screening device, including a support plate 100, a multi-stage screen assembly 200, and a vibration mechanism 300. The support plate 100 has several guide holes 110. The multi-stage screen assembly 200 has at least two standard screens 210 arranged vertically. The mesh size of the standard screens 210 gradually increases downwards along the vertical direction. Each standard screen 210 has several ears 211 on its outer periphery. The vibration mechanism 300 includes a vibrating plate 310, a connecting guide rod 320, a vibration spring 330, and a drive module 400. The connecting guide rod 320 has a shoulder 321. A connecting rod portion 322 is provided on one side of the shaft shoulder 321, and a guide rod portion 323 is provided on the other side of the shaft shoulder 321. The connecting rod portion 322 passes through the ears 211 of all the standard screens 210 in the vertical direction in sequence, and the guide rod portion 323 is inserted into the guide hole 110. The vibrating plate 310 and the guide rod portion 323 are slidably connected. One side of the vibrating plate 310 abuts against the shaft shoulder 321. The vibrating spring 330 is sleeved on the guide rod portion 323. One end of the vibrating spring 330 abuts against the vibrating plate 310, and the other end of the vibrating spring 330 abuts against the support plate 100. The drive module 400 is provided with a cam 410, and the outer contour of the cam 410 abuts against the vibrating plate 310. In this embodiment, the support plate 100 is provided with 4 guide holes 110, and the connecting guide rod 320 is provided with 4 holes.

[0037] Specifically, during operation, the cam 410 in the drive module 400 begins to rotate. Since the outer contour of the cam 410 is not a regular circle, as the cam 410 rotates, its outer contour contacts and pushes the vibrating plate 310. The cam 410 pushes the vibrating plate 310 to reciprocate linearly along the guide rod portion 323. Because one side of the vibrating plate 310 abuts against the shaft shoulder 321, the entire connecting guide rod 320 moves together with the vibrating plate 310 under the push of the cam 410. The connecting rod portion 322 of the connecting guide rod 320 passes sequentially through the ears 211 of all the standard screens 210. When the connecting guide rod 320 moves, it drives the standard screens 210 at each level to vibrate synchronously. The material to be screened is placed on the multi-stage screen assembly 200. Under the vibration of the screens, materials of different particle sizes will pass through the corresponding mesh size of the standard screens 210, achieving grading and screening according to particle size. Smaller particles pass through the lower standard screen 210 with a larger mesh size, while larger particles remain in the upper standard screen 210 with a smaller mesh size. In this embodiment, each standard screen 210 has four ears 211 correspondingly arranged on its outer periphery. The multi-stage screen assembly 200 has five standard screens 210 arranged vertically, with only the bottommost standard screen 210 having no screen holes. The mesh size of the standard screens 210 gradually increases vertically downwards, enabling multi-stage screening of materials in one go, separating materials of different particle size ranges simultaneously, which greatly improves screening efficiency compared to single-stage screening equipment.

[0038] In this embodiment, the connecting guide rod 320 is separated into a connecting rod portion 322 and a guide rod portion 323 by a shoulder 321. The connecting rod portion 322 connects to the screen, and the guide rod portion 323 is inserted into the guide hole 110 of the support plate 100, providing stable guidance for the vibration of the connecting guide rod 320 and the entire screen assembly. Simultaneously, the vibration spring 330 is sleeved on the guide rod portion 323, which not only buffers and dampens vibrations but also further enhances the stability of the entire vibration system, ensuring stable operation of the equipment for extended periods. In this embodiment, the cam 410 drives the vibrating plate 310, which in turn drives the connecting guide rod 320 and the screen to vibrate. This driving method generates relatively stable and continuous vibration, which is beneficial for the full dispersion and screening of materials on the screen, improving screening accuracy. In this embodiment, each standard screen 210 is provided with an ear 211 on its outer periphery. The screen is connected by a connecting rod 322 passing through the ear 211 in sequence. This structural design makes the installation and disassembly of the screen convenient, facilitating regular inspection, cleaning, or replacement of the screen and reducing equipment maintenance costs. At the same time, the vibration mechanism 300 adopts a modular design, which is convenient to use and quick to install, improving the portability of this device.

[0039] In some embodiments of this utility model, the drive module 400 includes a housing 420, a primary gear set 430, a secondary gear set 440, and a drive shaft 450. The primary gear set 430 and the secondary gear set 440 are disposed within the housing 420, and the housing 420 and the support plate 100 are detachably connected. The drive shaft 450 is drive-connected to the primary gear set 430, the output end of the primary gear set 430 is drive-connected to the input end of the secondary gear set 440, and the output end of the secondary gear set 440 is drive-connected to the cam 410. Specifically, in this embodiment, power is transmitted from the drive shaft 450 to the drive module 400. When the drive shaft 450 rotates, it drives the primary gear set 430, which is drive-connected to it, to rotate. The primary gear set 430 starts working under the drive of the drive shaft 450, and its output end transmits power to the input end of the secondary gear set 440. Through the transmission of the two gear sets, the speed adjustment and torque variation can be realized to meet the motion parameters required by the cam 410. The output end of the secondary gear set drives the cam 410 to rotate. Because of its special profile shape, the cam 410 contacts and pushes the vibrating plate 310 during rotation, causing the vibrating plate 310 to reciprocate linearly. This ultimately drives the connecting guide rod 320 and the screen assembly to vibrate, completing the material screening process. The combined transmission of the primary gear set 430 and the secondary gear set 440 smoothly transmits power from the drive shaft 450 to the cam 410. Compared to some direct or single-drive structures, multi-stage gear transmission can better adapt to different workloads and speed requirements, reducing impact and vibration during transmission and ensuring the stability and reliability of the equipment. The drive module 400 is encapsulated in a housing 420, which is detachably connected to the support plate 100. This modular design makes the drive module 400 a relatively independent component, facilitating overall disassembly and repair in case of equipment failure. It eliminates the need for large-scale disassembly of the entire screening equipment, shortening repair time and reducing maintenance difficulty.

[0040] In some embodiments of this utility model, the primary gear set 430 includes a first bevel gear 431, a second bevel gear 432, and a first transmission shaft 433. The two sides of the first transmission shaft 433 are rotatably mounted on the outer casing 420 via bearings 460. The first bevel gear 431 is fixedly connected to the drive shaft 450, and the second bevel gear 432 is fixedly connected to the first transmission shaft 433. The first bevel gear 431 and the second bevel gear 432 mesh, and the transmission ratio of the first bevel gear 431 and the second bevel gear 432 is 1:1. Specifically, in this embodiment, the engagement of the first bevel gear 431 and the second bevel gear 432 enables a change in the transmission direction. In this embodiment, this bevel gear transmission structure allows for flexible power transmission to the desired direction, optimizing the overall layout of the equipment and making the arrangement of various components more reasonable and compact. The bevel gear structure is relatively compact and can withstand large loads. During the operation of screening equipment, it may be subjected to various forces such as material impact. The first-stage gear set 430 adopts a bevel gear structure, which can effectively disperse and transmit these forces, ensuring that the transmission system can still work normally under a large load, thus improving the durability and reliability of the equipment.

[0041] In some embodiments of this utility model, the secondary gear set 440 includes a first spur gear 441, a second spur gear 442, and a second transmission shaft 443. The second transmission shaft is rotatably mounted on the housing 420 via a bearing 460. The first spur gear 441 is fixedly connected to the first transmission shaft 443, and the second spur gear 442 is fixedly connected to the second transmission shaft 443. The first spur gear 441 meshes with the second spur gear 442. One end of the second transmission shaft 443 passes through the housing 420 and is detachably connected to the cam 410. Specifically, in this embodiment, when the first transmission shaft 433 of the primary gear set 430 rotates, it drives the first spur gear 441, which is fixedly connected to it, to rotate synchronously. Since the first spur gear 441 and the second spur gear 442 mesh with each other, the rotation of the first spur gear 441 drives the second spur gear 442 to rotate. The second spur gear 442 is fixed on the second transmission shaft 443, so the second transmission shaft 443 rotates together with the second spur gear 442. Finally, one end of the second drive shaft 443 passes through the outer casing 420 and is detachably connected to the cam 410, thereby driving the cam 410 to rotate and transmitting power to the cam 410, causing it to push the vibrating plate 310 according to a predetermined motion pattern, thus realizing the vibration of the screen assembly. By rationally designing the gear ratio of the first spur gear 441 and the second spur gear 442, the rotational speed of the cam 410 can be precisely adjusted. In conjunction with the first-stage gear set 430, it can further meet the vibration frequency required for screening different materials. Compared with a single transmission structure, it can more flexibly adapt to various screening conditions, improving the equipment's adaptability to different materials and screening efficiency.

[0042] In some embodiments of this utility model, the transmission ratio of the first spur gear 441 and the second spur gear 442 is 1:n, where 2≤n≤5. In this embodiment, n is 3. With this structural design, it is more labor-saving to rotate the drive shaft 450.

[0043] In some embodiments of this invention, the second drive shaft 443 and the cam 410 are connected by a spline. The spline connection has multiple key teeth and keyways that engage with each other, resulting in a larger contact area compared to a conventional flat key connection. During the operation of the screening equipment, the cam 410 needs to transmit a large torque to drive the vibrating plate 310 and the screen assembly to vibrate. The spline connection effectively transmits the torque of the second drive shaft 443 to the cam 410, ensuring that the cam 410 can still work stably without slippage even when rotating at high speed and bearing a large load, thus guaranteeing the reliability of power transmission and ensuring the normal screening operation of the equipment.

[0044] In some embodiments of this utility model, an L-shaped rocker arm 451 is provided at one end of the drive shaft 450. Specifically, in this embodiment, the working scenario is usually in a remote outdoor area where power supply is difficult. By providing an L-shaped rocker arm 451 at one end of the drive shaft 450, manual control of the rotation of the drive shaft 450 can be achieved.

[0045] In some embodiments of this invention, the connecting guide rod 320 is made of aluminum alloy and has a hollow structure. While ensuring the connecting guide rod 320 possesses sufficient strength and rigidity to fulfill its connection and transmission functions, the hollow structure significantly reduces its weight. For screening equipment, the reduced overall weight helps decrease energy consumption during operation and improve energy efficiency. Simultaneously, the lighter weight also facilitates equipment installation, handling, and debugging, reducing the difficulty and cost of manual operation.

[0046] In some embodiments of this utility model, the lower end of the support plate 100 is provided with at least three support feet 120; all the support feet 120 are threadedly connected to the support plate 100. The design of providing at least three support feet 120 can ensure the stability of the support plate 100.

[0047] In some embodiments of this utility model, the support foot 120 has a conical structure. In this embodiment, when the device is used outdoors and a flat working platform is lacking, the support foot 120 can be inserted into soft soil, thus improving the practicality of the device.

[0048] In this embodiment, the support plate 100 comprises a first substrate and a second substrate, which are connected together by a hinge.

[0049] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. An outdoor modular multi-stage screening device, characterized in that, include: A support plate (100) is provided with a plurality of guide holes (110); A multi-stage screen assembly (200) is provided with at least two standard screens (210) in the vertical direction; the mesh count of the standard screens (210) gradually increases downward in the vertical direction; and each standard screen (210) is provided with a plurality of ears (211) on its outer periphery. A vibration mechanism (300) is provided, comprising a vibration plate (310), a connecting guide rod (320), a vibration spring (330), and a drive module (400). The connecting guide rod (320) is provided with a shoulder (321), a connecting rod portion (322) is provided on one side of the shoulder (321), and a guide rod portion (323) is provided on the other side of the shoulder (321). The connecting rod portion (322) passes sequentially through the ears (211) of all the standard screens (210) in the vertical direction, and the guide rod portion (323) is inserted into... In the guide hole (110), the vibrating plate (310) and the guide rod (323) are slidably connected. One side of the vibrating plate (310) abuts against the shoulder (321). The vibrating spring (330) is sleeved on the guide rod (323). One end of the vibrating spring (330) abuts against the vibrating plate (310), and the other end of the vibrating spring (330) abuts against the support plate (100). The drive module (400) is provided with a cam (410), and the outer contour of the cam (410) abuts against the vibrating plate (310).

2. The outdoor modular multi-stage screening device according to claim 1, characterized in that, The drive module (400) includes a housing (420), a primary gear set (430), a secondary gear set (440), and a drive shaft (450); the primary gear set (430) and the secondary gear set (440) are disposed inside the housing (420), and the housing (420) and the support plate (100) are detachably connected; the drive shaft (450) is drivenly connected to the primary gear set (430), the output end of the primary gear set (430) is drivenly connected to the input end of the secondary gear set (440), and the output end of the secondary gear set (440) is drivenly connected to the cam (410).

3. The outdoor modular multi-stage screening device according to claim 2, characterized in that, The first-stage gear set (430) includes a first bevel gear (431), a second bevel gear (432), and a first drive shaft (433). The two sides of the first drive shaft (433) are rotatably mounted on the outer casing (420) via bearings (460). The first bevel gear (431) is fixedly connected to the drive shaft (450), and the second bevel gear (432) is fixedly connected to the first drive shaft (433). The first bevel gear (431) and the second bevel gear (432) mesh, and the transmission ratio between the first bevel gear (431) and the second bevel gear (432) is 1:

1.

4. The outdoor modular multi-stage screening device according to claim 3, characterized in that, The secondary gear set (440) includes a first spur gear (441), a second spur gear (442), and a second transmission shaft (443). The second transmission shaft is rotatably mounted on the outer casing (420) via a bearing (460). The first spur gear (441) and the first transmission shaft (443) are fixedly connected, and the second spur gear (442) and the second transmission shaft (443) are fixedly connected. The first spur gear (441) meshes with the second spur gear (442). One end of the second transmission shaft (443) passes through the outer casing (420) and is detachably connected to the cam (410).

5. The outdoor modular multi-stage screening device according to claim 4, characterized in that, The transmission ratio between the first spur gear (441) and the second spur gear (442) is 1:n, where 2≤n≤5.

6. The outdoor modular multi-stage screening device according to claim 4, characterized in that, The second drive shaft (443) and the cam (410) are connected by a spline.

7. The outdoor modular multi-stage screening device according to claim 4, characterized in that, An L-shaped rocker arm (451) is provided at one end of the drive shaft (450).

8. The outdoor modular multi-stage screening device according to claim 1, characterized in that, The connecting guide rod (320) is made of aluminum alloy and has a hollow structure.

9. The outdoor modular multi-stage screening device according to claim 1, characterized in that, The lower end of the support plate (100) is provided with at least 3 support feet (120); all of the support feet (120) are threadedly connected to the support plate (100).

10. The outdoor modular multi-stage screening device according to claim 9, characterized in that, The support foot (120) has a tapered structure.

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