Gravel screening device for civil engineering

Abstract

The invention discloses a gravel screening device for civil engineering. The gravel screening device comprises a strip-shaped base; the screening assembly is connected to the middle of the strip-shaped base and used for multi-stage screening of gravel; the conveying assembly is connected to the strip-shaped base, located on one side of the screening assembly and used for conveying to-be-screened gravel into the screening assembly, and the conveying assembly communicates with the screening assembly; and the collecting assembly is connected to the strip-shaped base, located on the other side of the screening assembly and used for collecting screened materials, and the collecting assembly communicates with the screening assembly.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a sand and gravel screening device for civil engineering. Background Technology

[0002] The working principle of the sand and gravel screening device is mainly based on the screening and stratification effect of materials. The raw material mixture enters the screening machine through the feeding device. After being screened by the screen, larger stone particles are blocked above the screen, while smaller sand particles fall below the screen through the screen holes. By adjusting the screen hole diameter, the particle size of the stone can be flexibly controlled to meet the needs of different projects.

[0003] In the traditional method, after the sand and gravel are screened in multiple stages, the material on each screen needs to be manually moved and transferred before the next batch of sand and gravel is screened. This method is inefficient and takes up a lot of time, which seriously affects the screening efficiency of sand and gravel. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sand and gravel screening device for civil engineering, which can automatically feed, screen and collect materials, thereby improving construction efficiency.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is a sand and gravel screening device for civil engineering, comprising: Strip-shaped base; A screening assembly, connected to the middle of the strip base, is used for multi-stage screening of sand and gravel; A transport component, connected to the strip base and located on one side of the screening component, is used to transport the sand and gravel to be screened into the screening component, and the transport component is in communication with the screening component; A collection component, connected to the strip base and located on the other side of the screening component, is used to collect the screened material, and the collection component is in communication with the screening component.

[0006] A further improvement of the sand and gravel screening device for civil engineering of the present invention is that the screening component includes: A screening box is located above the strip base. The top of the screening box has an opening, and multiple discharge ports are vertically spaced on the side of the screening box that is relatively close to the collection component. An opening and closing unit is movably connected to multiple discharge ports and is used to synchronously control the opening and closing of multiple discharge ports; Multiple unloading troughs are located on the side of the screening box that is relatively close to the collection component and are inclined downwards. The multiple unloading troughs are connected to the multiple discharge ports one by one. Multiple vertical rods are located on opposite sides of the screening box and connected to the strip base, and each vertical rod is connected to the screening box by a spring; Centrifuge blocks are rotatably connected to the bottom of the screening box and are used to shake the screening box. Multiple screen plates are vertically spaced within the screening box and correspond one-to-one with multiple discharge ports. The screen aperture of the multiple screen plates gradually decreases from top to bottom. The end of each screen plate that is relatively close to the corresponding discharge port is rotatably connected to the screening box via a rotating shaft, and the rotating shaft is flush with the bottom edge of the corresponding discharge port. The unloading unit is used to drive multiple screen plates to swing to an inclined state so that the material on the screen plates can be discharged from the corresponding discharge port.

[0007] A further improvement of the sand and gravel screening device for civil engineering of the present invention is that a double-headed motor is connected to the bottom of the screening box, the two output ends of the double-headed motor rotate in opposite directions, and the centrifugal block is connected to both output ends.

[0008] A further improvement of the sand and gravel screening device for civil engineering of the present invention is that the unloading unit includes: The movable block has a vertically opening on the inner wall of the screening box on the side relatively away from the discharge port, which provides a mounting groove for the movable block to move vertically. A driven plate, which is located in the mounting groove and vertically connected to the bottom end of the moving block; Multiple rotating rods are arranged in a one-to-one correspondence with multiple sieve plates. One end of each sieve plate is hinged to the driven plate, and the other end is slidably inserted into the corresponding sieve plate. Each sieve plate has a first slot for the corresponding rotating rod to be inserted at the end that is relatively close to the driven plate. A first driving component is connected inside the screening box to drive the moving block to move up and down.

[0009] A further improvement of the sand and gravel screening device for civil engineering of the present invention is that the first driving component includes: A first motor is connected to the top of the screening box on the side relatively away from the collecting assembly; The first lead screw is located in the mounting groove. The top end of the first lead screw extends out of the mounting groove and is coaxially connected to the motor shaft of the first motor. The bottom end of the first lead screw is rotatably connected to the mounting groove. The first lead screw is offset from the driven plate and screwed to the moving block.

[0010] A further improvement of the sand and gravel screening device for civil engineering of the present invention is that the opening and closing unit includes: Multiple baffles correspond one-to-one with multiple discharge ports, and each baffle is adapted to the corresponding discharge port. Each baffle can move up and down, and each discharge port has an accommodating space above it for the corresponding baffle to move. A linkage rod is used to connect multiple baffles together; The second driving component is connected inside the screening box and is used to drive any of the baffles or the linkage rod to move up and down.

[0011] A further improvement of the sand and gravel screening device for civil engineering of the present invention is that the second driving component includes a second lead screw, which is vertically arranged and its bottom end is rotatably connected to the bottom of the uppermost discharge port, and its top end is rotatably connected to the top of the uppermost accommodating space. The uppermost baffle is provided with a threaded hole for the second lead screw to pass through and be screwed into. The second lead screw is connected to an external drive motor through a transmission assembly.

[0012] A further improvement of the sand and gravel screening device for civil engineering of the present invention is that the collection component includes: A collection box, which is movably connected to the strip base; Multiple drawers are provided, each corresponding to one of the multiple unloading troughs. Each drawer in the collection box has a through-hole for sliding, allowing the corresponding drawer to be pulled out. Each drawer has an opening on the side closest to the screening box for insertion into the corresponding unloading trough.

[0013] A further improvement of the sand and gravel screening device for civil engineering of the present invention is that one of the collection box and the screening box is provided with a rod, and the other is provided with a second slot for inserting the rod. When the rod is inserted into the second slot, a plurality of discharge troughs are inserted into a plurality of drawers in a corresponding manner. The size of the second slot is larger than the size of the rod, and the size of the discharge trough is smaller than the size of the opening of the corresponding drawer, so as to accommodate the vibration margin of the screening box during vibration.

[0014] A further improvement of the sand and gravel screening device for civil engineering of the present invention is that the transport component includes a Z-type belt conveyor, the end of the upper flange section of the Z-type belt conveyor being located directly above the opening of the screening box.

[0015] Compared with the prior art, the advantages of the present invention are: The combination of screening, collection, and transportation components facilitates fully automated feeding, screening, and collection of sand and gravel, improving construction efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the sand and gravel screening device for civil engineering of the present invention.

[0018] Figure 2 This is a schematic diagram showing the disassembly of the screening box in the sand and gravel screening device for civil engineering of the present invention.

[0019] Figure 3 This is a schematic diagram of the sieve plate distribution of the sand and gravel screening device for civil engineering of the present invention.

[0020] Figure 4 This is a detailed structural diagram of the unloading unit of the sand and gravel screening device for civil engineering of the present invention.

[0021] Figure 5 This is a detailed structural diagram of the opening and closing unit of the sand and gravel screening device for civil engineering of the present invention.

[0022] Figure 6 This is a detailed structural diagram of the second drive component of the sand and gravel screening device for civil engineering of the present invention.

[0023] Figure 7 This is a detailed structural diagram of the strip base of the sand and gravel screening device for civil engineering of the present invention.

[0024] Figure 8 This is a schematic diagram showing the disassembled collection box of the sand and gravel screening device for civil engineering of the present invention.

[0025] In the diagram: 1. Strip base; 2. Transport assembly; 3. Screening assembly; 301. Screening box; 302. Opening; 303. Screen plate; 304. Vertical rod; 305. Spring; 306. Discharge port; 307. Unloading chute; 308. Hollow block; 309. Dual-head motor; 310. Centrifugal block; 311. Baffle; 312. Accommodation space; 313. Linkage rod; 314. Mounting slot; 315. First motor; 316. First lead screw; 17. Moving block; 318. Driven plate; 319. Rotating rod; 320. Cover plate; 321. Second lead screw; 322. C-type transmission component; 323. C-type through groove; 4. Collection assembly; 401. Collection box; 402. Drawer; 403. Sliding space; 404. Opening; 405. Handle; 406. Sliding block; 407. Limiting rod; 408. Limiting block; 5. Inserted groove; 6. Second motor; 7. Third lead screw; 8. Moving block. Detailed Implementation

[0026] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0027] The sand and gravel screening device for civil engineering of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Please see Figures 1-8 As shown, a sand and gravel screening device for civil engineering includes: Strip base 1; Screening component 3 is connected to the middle of the strip base 1 and is used for multi-stage screening of sand and gravel; The transport component 2 is connected to the strip base 1 and located on one side of the screening component 3. It is used to transport the sand and gravel to be screened into the screening component 3. The transport component 2 is connected to the screening component 3. The collecting component 4 is connected to the strip base 1 and located on the other side of the screening component 3. It is used to collect the screened material and is connected to the screening component 3.

[0029] The cooperation of the screening component 3, the collection component 4, and the transportation component 2 facilitates the fully automated feeding, screening, and collection of sand and gravel, thereby improving construction efficiency.

[0030] Preferably, the screening component 3 includes: The screening box 301 is located above the strip base 1. The top of the screening box 301 has an opening 302. The screening box 301 has a plurality of discharge ports 306 vertically spaced on the side relatively close to the collection component 4. An opening and closing unit is movably connected to multiple discharge ports 306 and is used to synchronously control the opening and closing of multiple discharge ports 306; Multiple discharge troughs 307 are located on the side of the screening box 301 that is relatively close to the collection component 4 and are inclined downwards. The multiple discharge troughs 307 are connected to the multiple discharge ports 306 one by one. Multiple vertical rods 304 are located on opposite sides of the screening box 301 and connected to the strip base 1. Each vertical rod 304 is connected to the screening box 301 by a spring 305. Centrifuge block 310 is rotatably connected to the bottom of the screening box 301 and is used to shake the screening box 301; Multiple screen plates 303 are vertically spaced within the screening box 301 and correspond one-to-one with multiple discharge ports 306. The screen aperture of the multiple screen plates 303 gradually decreases from top to bottom. The end of each screen plate 303 that is relatively close to the discharge port 306 is rotatably connected to the screening box 301 through a rotating shaft, and the rotating shaft is flush with the bottom edge of the discharge port 306. The unloading unit is used to drive multiple screen plates 303 to swing to an inclined state so that the material on the screen plate 303 can be discharged from the corresponding discharge port 306.

[0031] Specifically, the bottommost of the multiple sieve plates 303 does not have sieve holes.

[0032] By limiting the aperture of the screen holes on each screen plate 303, it is convenient to perform multi-stage screening of the sand and gravel, and screen the materials of each grade on the corresponding screen mesh for collection, thereby improving the screening quality.

[0033] Preferably, a dual-head motor 309 is connected to the bottom of the screening box 301. The two output ends of the dual-head motor 309 rotate in opposite directions, and the centrifugal block 310 is connected to each of the two output ends.

[0034] By setting two centrifugal blocks 310 that rotate in opposite directions, and cooperating with the spring 305 between the screening box 301 and the vertical rod 304, the screening box 301 is kept in an irregular shaking state at all times so as to screen the material in the screening box 301.

[0035] Preferably, the unloading unit includes: The movable block 317 has a vertically provided mounting groove 314 on the inner wall of the screening box 301 on the side relatively away from the discharge port 306, which allows the movable block 317 to move vertically. Driven plate 318, which is located in the mounting groove 314 and vertically connected to the bottom end of the movable block 317; Multiple rotating rods 319 are arranged one-to-one with multiple screen plates 303. One end of each screen plate 303 is hinged to the driven plate 318, and the other end is slidably inserted into the screen plate 303. Each screen plate 303 has a first slot for inserting the rotating rod 319 at the end that is relatively close to the driven plate 318. The first driving component is connected inside the screening box 301 to drive the moving block 317 to move up and down.

[0036] The operating principle of the unloading unit is as follows: When unloading is required, the first driving component controls the moving block 317 to move upward. The moving block 317 drives the driven plate 318 to move upward, which in turn drives multiple rotating rods 319 to move upward. While the multiple rotating rods 319 move upward, they will also adaptively swing and automatically adjust the insertion depth in the first slot, and drive multiple screen plates 303 to swing around the corresponding rotating axis to an inclined state. The material on each screen plate 303 will automatically be discharged from the corresponding discharge port 306 due to gravity.

[0037] Preferably, the first driving element includes: The first motor 315 is connected to the top of the screening box 301 on the side relatively away from the collection assembly 4; The first lead screw 316 is located in the mounting groove 314. The top end of the first lead screw 316 extends out of the mounting groove 314 and is coaxially connected to the motor shaft of the first motor 315. The bottom end of the first lead screw 316 is rotatably connected to the mounting groove 314. The first lead screw 316 is offset from the driven plate 318 and screwed into the moving block 317.

[0038] Specifically, the top of the movable block 317 is connected to a baffle 320 to protect the first lead screw 316, and the top of the screening box 301 is provided with a channel through which the baffle 320 passes, and the channel is connected to the mounting groove 314.

[0039] By setting up this channel, the baffle 320 is prevented from affecting the up-and-down movement of the moving block 317. The baffle 320, together with the driven plate 318, blocks the opening of the mounting groove 314, preventing large-diameter sand and gravel on the screen plate 303 from entering the mounting groove 314 and affecting the rotation of the first lead screw 316.

[0040] Preferably, the opening and closing unit includes: Multiple baffles 311 correspond one-to-one with multiple discharge ports 306, and each baffle 311 is adapted to the corresponding discharge port 306. Each baffle 311 can move up and down, and each discharge port 306 has an accommodating space 312 above it for the baffle 311 to move. Linkage rod 313 is used to connect multiple baffles 311 together; The second driving component is connected inside the screening box 301 and is used to drive any of the baffles 311 or the linkage rod 313 to move up and down.

[0041] The operating principle of the opening and closing unit is as follows: During sand and gravel screening, multiple baffles 311 are positioned at the corresponding discharge ports 306 to prevent sand and gravel from falling out; when the sand and gravel screening is completed and unloading is required, the second driving component controls any one of the baffles 311 to move upward, and based on the linkage rod 313, drives all other baffles 311 to move upward synchronously until multiple baffles 311 move into the corresponding receiving space 312. At this time, the multiple baffles 311 release their obstruction of multiple discharge ports 306, facilitating unloading.

[0042] Preferably, the second driving component includes a second lead screw 321, which is vertically arranged and rotatably connected at its bottom end to the bottom of the uppermost discharge port 306, and rotatably connected at its top end to the top of the uppermost receiving space 312. The uppermost baffle 311 has a threaded hole through which the second lead screw 321 passes and is screwed into place. The second lead screw 321 is connected to an external drive motor through a transmission assembly.

[0043] Specifically, the drive motor is the first motor 315, the transmission component is a C-shaped transmission component 322, and a C-shaped through groove 323 is provided on the top end face of the screening box 301. The two flange grooves of the C-shaped through groove 323 are respectively connected to the uppermost accommodating space 312 and the mounting groove 314. The C-shaped transmission component 322 is movably connected in the C-shaped through groove 323, and one end is connected to the first lead screw 316 for transmission, and the other end is connected to the second lead screw 321 for transmission.

[0044] By setting the C-type transmission component 322, when unloading is required, the first motor 315 only needs to drive the first lead screw 316 to rotate, which can simultaneously control the flipping and tilting of multiple screen plates 303 and the upward movement of multiple baffles 311, which is convenient, quick and improves construction efficiency.

[0045] Specifically, the C-shaped transmission component 322 includes three transmission shafts, which are rotatably connected to the two flange grooves and one belly groove of the C-shaped through groove 323, respectively. Adjacent transmission shafts are connected by a first bevel gear for transmission. One of the two transmission shafts located in the two flange grooves is connected to the first lead screw 316 by a second bevel gear, and the other is connected to the second lead screw 321 by a third bevel gear.

[0046] Preferably, the collection component 4 includes: Collection box 401, which is movably connected to the strip base 1; Multiple drawers 402 are provided one-to-one with multiple unloading troughs 307. Each drawer 402 in the collection box 401 is provided with a sliding space 403 for pulling out the corresponding drawer 402. Each drawer 402 has an opening 404 on the side closest to the screening box 301 for inserting the corresponding unloading trough 307.

[0047] Specifically, each of the drawers 402 is connected to a handle 405 on the side of the drawer that is relatively away from the sieving box 301.

[0048] The handle 405 facilitates the pulling out of the drawer 402.

[0049] Specifically, each drawer 402 is connected to a sliding block 406 on both opposite sides. The sliding block 406 slides against the side wall of the sliding space 403. Limiting blocks 408 are connected to the inner walls of both opposite sides of the sliding space 403 to block the sliding block 406. A limiting rod 407 is connected to the end of the sliding block 406 that is closer to the limiting block 408. The limiting block 408 has a limiting groove for the limiting rod 407 to be inserted. When the limiting block 408 and the sliding block 406 are in contact, the drawer 402 is completely contained in the sliding space 403.

[0050] Since the sliding space 403 is open through, the drawer 402 cannot be limited within the sliding space 403. Therefore, a sliding block 406 is provided to cooperate with the limiting block 408. When the drawer 402 is slid until the sliding block 406 and the limiting block 408 abut against each other, the limiting rod 407 is inserted into the limiting groove. At this time, the drawer 402 can be completely accommodated in the sliding space 403 for subsequent unloading.

[0051] Specifically, the strip base 1 has a groove 5 facing the screening box 301. A third lead screw 7 is rotatably connected in the groove 5. A second motor 6 is also connected in the groove 5. The motor shaft of the second motor 6 is coaxially connected with the third lead screw 7. A movable block 8 is also slidably connected in the groove 5. The movable block 8 is screwed onto the third lead screw 7 and is connected to the bottom of the collection box 401.

[0052] The second motor 6 controls the rotation of the third lead screw 7, which in turn drives the movable block 8 to slide along the groove 5, thereby driving the collection box 401 to move along the length of the groove 5, so as to control the movement of the collection box 401.

[0053] Preferably, one of the collection box 401 and the screening box 301 is provided with a rod, and the other is provided with a second slot for inserting the rod. When the rod is inserted into the second slot, a plurality of discharge troughs 307 are inserted into a plurality of drawers 402 in a one-to-one correspondence. The size of the second slot is larger than the size of the rod, and the size of the discharge trough 307 is smaller than the size of the opening of the corresponding drawer 402, so as to accommodate the vibration margin of the screening box 301 during vibration.

[0054] Specifically, the insertion rod is connected to the side of the collection box 401 that is relatively close to the screening box 301, and the side of the screening box 301 that is relatively close to the collection box 401 is connected to a hollow block 308, and the second slot is formed inside the hollow block 308.

[0055] By setting the insert rod and the hollow block 308, the distance between the collection box 401 and the screening box 301 is always kept consistent in order to facilitate unloading.

[0056] The specific unloading method is as follows: When the material in the screening box 301 has been screened and needs to be unloaded, first control the centrifugal block 310 to stop rotating, then control the collection box 401 to move until the insert rod is inserted into the second slot. At this time, multiple unloading troughs 307 are correspondingly inserted into multiple drawers 402. Then control multiple screen plates 303 to swing and tilt synchronously and multiple baffles 311 to move upward to open multiple discharge ports 306. Then control the centrifugal block 310 to rotate. At this time, since the insert rod is inserted into the second slot, the screening box 301 will not shake significantly, but will instead vibrate at a high frequency to discharge all the material on each screen plate 303. The material of the corresponding gradation is transferred to multiple drawers 402 through multiple unloading troughs 307.

[0057] Preferably, the transport assembly 2 includes a Z-shaped belt conveyor, the end of the upper flange section of which is located directly above the opening 302 of the screening box 301.

[0058] By setting up this Z-type belt conveyor, the sand and gravel to be screened only need to be continuously transported onto the belt, and it can be automatically transported upwards and enter the screening box 301 through the opening 302.

[0059] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding and reading. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A sand and gravel screening device for civil engineering, characterized in that, include: Strip-shaped base; A screening assembly, connected to the middle of the strip base, is used for multi-stage screening of sand and gravel; A transport component, connected to the strip base and located on one side of the screening component, is used to transport the sand and gravel to be screened into the screening component, and the transport component is in communication with the screening component; A collection component, connected to the strip base and located on the other side of the screening component, is used to collect the screened material, and the collection component is in communication with the screening component.

2. The sand and gravel screening device for civil engineering as described in claim 1, characterized in that, The screening component includes: A screening box is located above the strip base. The top of the screening box has an opening, and multiple discharge ports are vertically spaced on the side of the screening box that is relatively close to the collection component. An opening and closing unit is movably connected to multiple discharge ports and is used to synchronously control the opening and closing of multiple discharge ports; Multiple unloading troughs are located on the side of the screening box that is relatively close to the collection component and are inclined downwards. The multiple unloading troughs are connected to the multiple discharge ports one by one. Multiple vertical rods are located on opposite sides of the screening box and connected to the strip base, and each vertical rod is connected to the screening box by a spring; Centrifuge blocks are rotatably connected to the bottom of the screening box and are used to shake the screening box. Multiple screen plates are vertically spaced within the screening box and correspond one-to-one with multiple discharge ports. The screen aperture of the multiple screen plates gradually decreases from top to bottom. The end of each screen plate that is relatively close to the corresponding discharge port is rotatably connected to the screening box via a rotating shaft, and the rotating shaft is flush with the bottom edge of the corresponding discharge port. The unloading unit is used to drive multiple screen plates to swing to an inclined state so that the material on the screen plates can be discharged from the corresponding discharge port.

3. The sand and gravel screening device for civil engineering as described in claim 2, characterized in that, The bottom of the screening box is connected to a dual-head motor, the two output ends of the dual-head motor rotate in opposite directions, and the centrifugal blocks are connected to both output ends.

4. The sand and gravel screening device for civil engineering as described in claim 2, characterized in that, The unloading unit includes: The movable block has a vertically opening on the inner wall of the screening box on the side relatively away from the discharge port, which provides a mounting groove for the vertical movement of the movable block. A driven plate, which is located in the mounting groove and vertically connected to the bottom end of the moving block; Multiple rotating rods are arranged in a one-to-one correspondence with multiple sieve plates. One end of each sieve plate is hinged to the driven plate, and the other end is slidably inserted into the corresponding sieve plate. Each sieve plate has a first slot for the corresponding rotating rod to be inserted at the end that is relatively close to the driven plate. A first driving component is connected inside the screening box to drive the moving block to move up and down.

5. The sand and gravel screening device for civil engineering as described in claim 4, characterized in that, The first driving element includes: A first motor is connected to the top of the screening box on the side relatively away from the collecting assembly; The first lead screw is located in the mounting groove. The top end of the first lead screw extends out of the mounting groove and is coaxially connected to the motor shaft of the first motor. The bottom end of the first lead screw is rotatably connected to the mounting groove. The first lead screw is offset from the driven plate and screwed to the moving block.

6. The sand and gravel screening device for civil engineering as described in claim 5, characterized in that, The opening / closing unit includes: Multiple baffles correspond one-to-one with multiple discharge ports, and each baffle is adapted to the corresponding discharge port. Each baffle can move up and down, and each discharge port has an accommodating space above it for the corresponding baffle to move. A linkage rod is used to connect multiple baffles together; The second driving component is connected inside the screening box and is used to drive any of the baffles or the linkage rod to move up and down.

7. The sand and gravel screening device for civil engineering as described in claim 6, characterized in that, The second driving component includes a second lead screw, which is vertically arranged and rotatably connected at its bottom end to the bottom of the uppermost discharge port, and rotatably connected at its top end to the top of the uppermost accommodating space. The uppermost baffle has a threaded hole through which the second lead screw passes and is screwed into place. The second lead screw is connected to an external drive motor through a transmission assembly.

8. The sand and gravel screening device for civil engineering as described in claim 2, characterized in that, The collection component includes: A collection box, which is movably connected to the strip base; Multiple drawers are provided, each corresponding to one of the multiple unloading troughs. Each drawer in the collection box has a through-hole for sliding, allowing the corresponding drawer to be pulled out. Each drawer has an opening on the side closest to the screening box for insertion into the corresponding unloading trough.

9. The sand and gravel screening device for civil engineering as described in claim 8, characterized in that, One of the collection box and the screening box is provided with a rod, and the other is provided with a second slot for inserting the rod. When the rod is inserted into the second slot, a plurality of discharge troughs are inserted into a plurality of drawers in a corresponding manner. The size of the second slot is larger than the size of the rod, and the size of the discharge trough is smaller than the size of the opening of the corresponding drawer, so as to accommodate the vibration margin of the screening box when it vibrates.

10. The sand and gravel screening device for civil engineering as described in claim 2, characterized in that, The transport assembly includes a Z-belt conveyor, the end of the upper flange section of which is located directly above the opening of the screening box.

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