Gravel screening device

Abstract

The utility model discloses a sandstone screening device which comprises a shell, a sandstone feeding port is formed in the upper end of the shell, a plurality of discharging ports are vertically and evenly distributed in one side edge of the shell, corresponding screening parts are arranged in the shell and correspond to the discharging ports, the screening particle size of the screening parts is gradually reduced from top to bottom, the screening parts are jointly provided with vibrating parts, and the vibrating parts are arranged in the shell. The vibrating part is used for driving the screening part to generate vibration, the vibrating part is provided with the lifting part, the lifting part is used for lifting the vibrating part to drive the screening part to incline, the gravel screening device can synchronously screen gravel with different particle sizes, screen meshes with different pore diameters do not need to be replaced, the practicability of the gravel screening device is improved, and the screening efficiency and precision are improved.

Description

Technical Field

[0001] The utility model relates to a sand and gravel screening device. Background Art

[0002] A construction project refers to an engineering entity formed by the construction of various types of buildings and their ancillary facilities and the installation of supporting lines and pipeline equipment. In the process of construction, a large amount of sand will be used. Since the original sand contains sand of various particle sizes, it cannot meet the needs of different types of construction. Usually, a screening device is used for screening. For example, the patent application number is CN202322251299.5, a sand and gravel screening machine, which includes a frame and a sand screening box slidably mounted on the frame, the sand screening box includes a rectangular frame and a screen fixed to the bottom of the rectangular frame, the frame is provided with a power mechanism for driving the sand screening box to move along the length direction of the frame, fixed plates are fixed on both sides of the bottom surface of the rectangular frame, a rotating shaft is rotatably installed between the two fixed plates, a knocking rod for knocking the screen is fixed to the outer peripheral surface of the rotating shaft, and a driving mechanism for driving the rotating shaft to reciprocate is provided on the rectangular frame.

[0003] Since the above-mentioned sand and gravel screening machine is relatively single and has a simple structure, it can only be used to screen one type of sand particles. When screening sand of other particle sizes, it is necessary to replace the screen with different apertures, which has high working costs and low practicality. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a sand and gravel screening device, which can synchronously screen sand and gravel of different particle sizes without replacing sieves with different apertures, thereby improving the practicality of the sand and gravel screening device and improving screening efficiency and accuracy.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a sand and gravel screening device, comprising a shell, a sand and gravel inlet is provided at the upper end of the shell, a plurality of discharge ports are evenly distributed vertically on one side of the shell, corresponding screening elements are provided in the shell corresponding to the plurality of discharge ports, the plurality of screening elements gradually decrease from the top to the smallest screening particle size, the plurality of screening elements are commonly provided with a vibrating element, the vibrating element is used to drive the screening element to vibrate, the vibrating element is provided with a lifting element, the lifting element is used to lift the vibrating element to drive the screening element to tilt.

[0006] Furthermore, the shell is rectangular, and through grooves are provided on the opposite sides of the shell corresponding to the discharge port, the screening elements are abutted against the discharge port and the through grooves, a rectangular slide groove is provided on the discharge port, the screening element is slidably connected to the rectangular slide groove, and is connected to the through groove through a vibrating element.

[0007] Furthermore, the screening element includes a screening box, a hinged rod is hinged at the bottom of the screening box, a sliding block is connected to the bottom of the hinged rod and is slidably connected to the rectangular slide groove, the screening box is connected to a sliding plate that slides and rotates toward the end surface of the through groove, the sliding plate is hinged to an abutment plate, and the abutment plate is connected to the vibrating element.

[0008] Furthermore, the abutment plates are provided with rack grooves, the vibrating member includes a driving motor, the driving motor is connected to a rotating rod, the rotating rod passes through the shell and the rack groove, and the rotating rod is provided with a gear corresponding to the rack groove, and the rotating rod is provided with a limiting part on the upper and lower end surfaces corresponding to the rack groove, and the limiting part is used to limit the gear from disengaging from the rack groove.

[0009] Furthermore, the driving motor is fixedly connected to the lifting member, and the lifting member includes a hydraulic telescopic rod fixed on the side wall of the shell, the telescopic end of the hydraulic telescopic rod is connected to a fixed plate, and the driving motor is fixed on the fixed plate. The expansion of the hydraulic telescopic rod drives the fixed plate to rise, and then the vibrating member tilts the screening box, thereby realizing that the sand and gravel that have not been screened out on the screening box are discharged through the discharge port.

[0010] Furthermore, the driving motor is fixedly connected to the lifting member, and the lifting member includes a slot arranged at the upper end of the shell, and a first screw rod and a second screw rod are arranged in the slot, and the first screw rod and the second screw rod are commonly connected to a lifting plate, and the driving motor is fixed on the lifting plate, and a first motor is arranged at the upper end of the first screw rod, and the second screw rod rotates synchronously with the first screw rod through a transmission member, thereby realizing the up and down movement of the lifting plate along the length of the screw rod.

[0011] Furthermore, the limiting part includes a first limiting plate and a second limiting plate, the first limiting plate and the second limiting plate are connected by a rotating shaft, the first limiting plate is movably connected with an insertion rod, the second limiting plate is provided with a socket corresponding to the insertion rod, the rotating rod is provided with a through hole corresponding to the socket, and the insertion rod passes through the through hole and is plugged into the socket.

[0012] Furthermore, the screening box includes a rectangular frame and a screen fixed on the rectangular frame; or the screening box includes a screening bottom plate, the left and right sides of the screening bottom plate are provided with side baffles extending upward, the end surface of the screening bottom plate facing the discharge port is hinged with an expansion plate, the two end surfaces of the expansion plate are slidably connected with the left and right side baffles, and the end surface of the screening bottom plate facing the through slot is provided with a rear baffle, and the height of the rear baffle is the same as the through slot.

[0013] Furthermore, the left and right side baffles are provided with arc-shaped slide grooves corresponding to the unfolding plates, and an arc-shaped plate is detachably connected to the opening of the arc-shaped slide groove, and a guide groove is provided on the arc-shaped plate, and a through rod is provided on the unfolding plate corresponding to the guide groove, and a sliding block is provided at the end of the through rod corresponding to the arc-shaped slide groove, and a tension spring is provided between the sliding block and the arc-shaped slide groove.

[0014] Furthermore, a buffer discharge piece is provided between the upper and lower adjacent screening boxes, and the buffer discharge piece includes a collecting barrel, and a spiral plate is provided inside the collecting barrel for moving sand and gravel to the next screening box.

[0015] Beneficial effects: The sand and gravel screening device comprises a plurality of screening elements with different screening particle sizes, and the screening elements are also jointly equipped with a vibrating element, which realizes the lateral reciprocating movement of the screening element through a rotating rod, a rack groove and a gear, so that the sand and gravel on the screening element can be screened more fully, and then the vibrating element is also equipped with a lifting element, which is used to lift the vibrating element to drive the screening element to tilt, so that the unscreened sand and gravel on the screening element are discharged through the discharge port, and multiple screening elements are driven by the vibrating element and the lifting element for screening, thereby improving the screening efficiency and screening accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of a sand and gravel screening device according to Embodiment 1;

[0017] Figure 2 for Figure 1 Schematic diagram from another perspective;

[0018] Figure 3 is a schematic diagram of another lifting member;

[0019] Figure 4 for Figure 1 Internal schematic diagram;

[0020] Figure 5 A schematic diagram of the lifting member being activated;

[0021] Figure 6 is a schematic diagram of a screening device using the second screening box;

[0022] Figure 7 It is a schematic diagram of Embodiment 2;

[0023] Figure 8 is a schematic diagram of a limiting portion;

[0024] Fig. 9 Schematic diagram of the first screening box.

[0025] 1. Shell; 2. Sand and gravel inlet; 3. Discharge port; 4. Screening element; 41. Screening box; 42. Articulated rod; 43. Sliding block; 44. Sliding plate; 45. Abutment plate; 46. Rack groove; 5. Vibrating element; 51. Driving motor; 52. Rotating rod; 521. Through hole; 53. Gear; 54. Limiting part; 541. First limiting plate; 542. Second limiting plate; 543. Inserting rod; 544. Inserting hole; 6. Lifting element; 7. Through groove; 8. Rectangular slide groove; 9. Rectangular frame; 10. Screen; 11. Screening bottom plate; 12. Side baffle; 13. Expanding plate; 14. Rear baffle; 15. Arc slide groove; 16. Arc plate; 17. Guide groove; 18. Buffering discharge element; 181. Collecting barrel; 182. Spiral plate. DETAILED DESCRIPTION

[0026] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0027] Refer to Figure 1-Figure 6 , Figure 8 , Fig. 9 As shown, the first embodiment of the utility model provides a sand and gravel screening device, including a shell 1, the shell 1 is rectangular, and is provided with a sand and gravel inlet 2 at the upper end, and a plurality of discharge ports 3 are evenly distributed vertically on one side, and through grooves 7 are provided on the opposite sides of the shell 1 corresponding to the discharge ports 3. In order to prevent the sand and gravel from being irregularly scattered in various places during the process of discharging along the discharge port 3 during sand and gravel screening, a discharge pipe is detachably connected to the discharge port 3 to ensure that the discharge process is discharged along the discharge pipe. The number of discharge ports 3 is selected according to the type of mixed sand or the number of different particle sizes of the same type of sand and gravel. Four discharge ports 3 are used as an example and explanation below. Four groups of screening elements 4 are provided in the shell 1 corresponding to the four discharge ports 3. The four groups of screening elements 4 are reduced from the top to the smallest screening particle size component, so as to realize multi-stage screening of sand and gravel or mixed sand with different particle sizes, thereby improving the screening efficiency. The four groups of screening elements 4 are all equipped with a vibrating element 5, which is used to drive the screening element 4 to vibrate. The vibrating element 5 is also equipped with a lifting element 6, which is used to lift the vibrating element 5 to drive the screening element 4 to tilt, and discharge the sand and gravel on the screening element 4 through the corresponding discharge port 3. Switches or controllers are provided for the opening and closing of the vibrating element 5 and the lifting element 6.

[0028] Specific references such as Figure 4As shown, the four screening elements 4 are correspondingly abutted on the four discharge ports 3 and the through slot 7, and the four discharge ports 3 are each provided with a rectangular slot 8. The screening element 4 is slidably connected to the rectangular through slot 7 and is connected to the through slot 7 through a vibrating element 5. The screening element 4 includes a screening box 41, and a hinged rod 42 is hingedly connected to the rectangular slot 8 at the bottom of the screening box 41, and a slider 43 slidably connected to the rectangular slot 8 is connected to the end of the hinged rod 42. A telescopic spring can also be arranged between the slider 43 and the rectangular slot 8 to ensure that the telescopic spring has an abutment force on the slider 43 in the rectangular slot 8. The screening box 41 is symmetrically provided with oblique grooves on the end face facing the through groove 7, and the two sides of the bottom of the oblique groove are provided with a first waist-shaped groove, and a waist-shaped plate is detachably connected to the opening of the first waist-shaped groove, and a second waist-shaped groove is provided on the waist-shaped plate, and a sliding round block is slidably connected to the first waist-shaped groove, and the sliding round block is provided with a connecting rod corresponding to the second waist-shaped groove, and the connecting rod is commonly connected with a sliding plate 44, and the other end of the sliding plate 44 is hinged with an abutting plate 45, and the abutting plate 45 abuts on the through groove 7, and a rack groove 46 is provided on the abutting plate 45, and the vibrating member 5 includes a driving motor 51, and the driving motor 51 is connected to a rotating rod 52, which passes through the shell 1 and the rack groove 46, and the rotating rod 52 is provided with a gear 53 corresponding to the rack groove 46, and the rotating rod 52 is provided with a limiting portion 54 on the upper and lower end surfaces corresponding to the rack groove 46, and the limiting portion 54 is used to limit the gear 53 from disengaging from the rack groove 46 to avoid affecting the start of the lifting member 6. By driving the motor 51 forward and reverse, the rotating rod 52 drives the gear 53 to rotate, and then drives the rack groove 46 to drive the screening box 41 to move back and forth horizontally, causing the sand and gravel on the screening box 41 to shake. During the shaking process, particles with a smaller diameter than the aperture size of the screening box 41 fall into the next layer of screening box 41, and the correct screening of the sand and gravel is ensured by screening layer by layer.

[0029] Refer to Figure 8 As shown, the limiting portion 54 includes a first limiting plate 541 and a second limiting plate 542, and the first limiting plate 541 and the second limiting plate 542 are connected by a rotating shaft. The first limiting plate 541 is movably connected with an insertion rod 543, and the second limiting plate 542 is provided with a socket 544 corresponding to the insertion rod 543, and the rotating rod 52 is provided with a through hole 521 corresponding to the socket 544. When the gear 53 is engaged with the rack groove 46, the first limiting plate 541 and the second limiting plate 542 are installed on the rotating rod 52, and the insertion rod 543 passes through the through hole 521 and is plugged into the socket 544 to realize the connection between the limiting portion 54 and the rotating rod 52, thereby ensuring that the gear 53 and the rack groove 46 are both restricted between the limiting portion 54. When the vibrating member 5 is started, it can be ensured that the limiting portion 54 will not affect the rotating rod 52 to drive the gear 53 to rotate and thereby drive the rack groove 46 to move. When the lifting member 6 is started, it can ensure that the limiting portion 54 drives the rack groove 46 to move up and down.

[0030] The utility model has two ways to set the lifting member 6, one of which is: refer to Figure 5As shown, the driving motor 51 is fixedly connected to the lifting member 6, and the lifting member 6 includes a hydraulic telescopic rod fixed to the side wall of the housing 1, and the telescopic end of the hydraulic telescopic rod is connected to a fixed plate, and the driving motor 51 is fixed to the fixed plate. The expansion of the hydraulic telescopic rod drives the fixed plate to rise, and then the rotating rod 52 causes the screening box 41 to tilt, so that the sand and gravel that are not screened out of the screening box 41 are discharged through the discharge port 3. The second is: refer to Figure 3 As shown, the driving motor 51 is fixedly connected to the lifting member 6, and the lifting member 6 includes a slot set at the upper end of the shell 1, and a first screw rod and a second screw rod are arranged in the slot, and the first screw rod and the second screw rod are connected to a lifting plate together, and the driving motor 51 is fixed on the lifting plate, and a first motor is arranged at the upper end of the first screw rod, and the second screw rod rotates synchronously with the first screw rod through a transmission member, so as to realize the lifting plate moving up and down along the length of the screw rod, and the transmission member includes a first sprocket wheel set on the first screw rod and a second sprocket wheel set on the second screw rod, and a chain is arranged between the first sprocket wheel and the second sprocket wheel (since the transmission member is a prior art, it will not be described in detail here, and the structure of the transmission member is not limited thereto). Through the setting of the lifting member 6, the sand and gravel that are not screened out of each screening box 41 are discharged through the corresponding discharge port 3 to obtain sand and gravel classifications of different particle sizes, so that the required sand and gravel can be quickly confirmed during the construction process, thereby improving work efficiency.

[0031] There are two types of screening boxes 41. The first type is shown in FIG. Figure 6 As shown, the screening box 41 includes a rectangular frame 9 and a screen 10 fixed on the rectangular frame 9. There is a problem with the first screening box 41. When the vibrating member 5 is started to drive the screening box 41 to move back and forth horizontally, since there is no baffle set at the position of the rectangular frame 9 corresponding to the discharge port 3, it is easy to cause the sand and gravel near the discharge port 3 to be discharged from the discharge port 3 during the horizontal reciprocating movement. Therefore, when the first screening box 41 is used, a hinged baffle can be provided at the upper end of the discharge port 3. During the horizontal reciprocating movement, the hinged baffle can block the sand and gravel to a certain extent to prevent it from being discharged from the discharge port 3. During the start-up of the lifting member 6, the screening box 41 can be tilted, causing a large amount of sand and gravel screened out of the screening box 41 to move toward the discharge port 3, so that the hinged baffle opens, and the sand and gravel are discharged to the discharge port 3. When there is no push of sand and gravel, the hinged baffle returns to its original state.

[0032] The second reference is Fig. 9As shown, the screening box 41 includes a screening bottom plate 11, and side baffles 12 are extended upward on the left and right sides of the screening bottom plate 11. An expansion plate 13 is hinged on the end surface of the screening bottom plate 11 facing the discharge port 3. The two end surfaces of the expansion plate 13 are slidingly connected with the left and right side baffles 12. A rear baffle 14 is provided on the end surface of the screening bottom plate 11 facing the through groove 7. The rear baffle is used to block the through groove 7 to prevent sand and gravel from running out of the through groove 7. The height of the rear baffle 14 is the same as that of the through groove 7 to ensure that the vibrating member 5 is not affected by the rear baffle 14 when starting, thereby realizing lateral reciprocating movement. In order to ensure that the sand and gravel in the screening box 41 can be smoothly discharged from the discharge pipe when the lifting member 6 lifts the screening box 41, an arc-shaped slide groove 15 is provided on the left and right side baffles 12 corresponding to the expansion plate 13, and an arc plate 16 is detachably connected at the opening of the arc-shaped slide groove 15, and a guide groove 17 is provided on the arc-shaped plate 16. A through rod is provided on the expansion plate 13 corresponding to the guide groove 17, and a sliding block is provided at the end of the through rod corresponding to the arc-shaped slide groove 15, and a tension spring is provided between the sliding block and the arc-shaped slide groove 15. When the screening box 41 is tilted by the lifting member 6, the sand and gravel on the screening box 41 will move toward the direction of the discharge port 3. When the expansion plate 13 is subjected to more and more force from the sand and gravel, it opens towards the limit value of the tension spring, so that the sand and gravel are discharged to the discharge port 3. When the sand and gravel are discharged, the expansion plate 13 is expanded by the tension spring and then restored to its original state.

[0033] Refer to Figure 7 As shown, the second embodiment is basically the same as the above-mentioned first embodiment, and the only difference is that a buffer discharge piece 18 is provided between the upper and lower adjacent screening boxes 41, and the buffer discharge piece 18 includes a collecting barrel 181. A spiral plate 182 is provided inside the collecting barrel 181 for moving sand and gravel to the next screening box 41. Through the setting of the spiral plate 182, the path of the sand and gravel screened off the upper layer to the next screening box 41 is extended, thereby generating a certain time. During this period of time, the sand and gravel originally performed in the next screening box 41 can be fully screened, thereby providing sufficient space for the sand and gravel in the spiral plate 182, thereby avoiding excessive accumulation on the screening box 41, which makes the screening box 41 unable to perform better screening.

[0034] Working method: Pour a certain amount of sand and gravel from the sand and gravel inlet 2, and the sand and gravel enter the uppermost screening box 41 through the sand and gravel inlet 2. The sand particles in the sand and gravel with a diameter smaller than the aperture of the uppermost screening box 41 will fall into the corresponding screening element 4 along the sieve holes. Some small-sized sand and gravel are sandwiched between large-sized sand and gravel and cannot pass through the sieve holes to enter the corresponding screening element 4. Therefore, it is necessary to start the vibrating element 5, and the vibrating element 5 reciprocates and laterally moves the screening element 4 to ensure efficient screening of the sand and gravel. After screening, the sand and gravel on the screening element 4 are discharged from the corresponding discharge port 3 through the lifting element 6. After discharge, the lifting element 6 drives the screening element 4 to restore to a straight state, and then the vibrating element 5 is started, and a new batch of sand and gravel enters the sand and gravel inlet 2 for the next batch of screening. This cycle is repeated and the sand and gravel are screened continuously until the corresponding amount of sand and gravel required for construction is screened out.

[0035] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A sand and gravel screening device, comprising a housing (1), wherein the upper end of the housing (1) is provided with a sand and gravel inlet (2), and one side of the housing (1) is vertically and evenly distributed with a plurality of discharge ports (3), characterized in that: Corresponding screening elements (4) are provided in the housing (1) corresponding to the plurality of discharge ports (3). The plurality of screening elements (4) gradually reduce in size from the top to the smallest screening particle size. The plurality of screening elements (4) are commonly provided with a vibrating element (5). The vibrating element (5) is used to drive the screening element (4) to vibrate. The vibrating element (5) is provided with a lifting element (6). The lifting element (6) is used to lift the vibrating element (5) to drive the screening element (4) to tilt.

2. The sand and gravel screening device according to claim 1, characterized in that: The shell (1) is rectangular in shape, and through grooves (7) are provided on opposite sides of the shell (1) corresponding to the discharge port (3), the screening element (4) is in contact with the discharge port (3) and the through groove (7), a rectangular slide groove (8) is provided on the discharge port (3), the screening element (4) is slidably connected to the rectangular slide groove (8), and is connected to the through groove (7) via a vibrating element (5).

3. The sand and gravel screening device according to claim 2, characterized in that: The screening element (4) comprises a screening box (41), the bottom of the screening box (41) is hinged with a hinge rod (42), the bottom of the hinge rod (42) is connected with a slider (43) which is slidably connected to the rectangular slide groove (8), the screening box (41) is connected with a sliding plate (44) which is slidably and rotatably connected to the end surface of the through groove (7), the sliding plate (44) is hinged with an abutment plate (45), and the abutment plate (45) is connected to the vibrating element (5).

4. The sand and gravel screening device according to claim 3, characterized in that: The contact plate (45) is provided with a rack groove (46), the vibrating member (5) comprises a driving motor (51), the driving motor (51) is connected with a rotating rod (52), the rotating rod (52) passes through the housing (1) and the rack groove (46), and the rotating rod (52) is provided with a gear (53) corresponding to the rack groove (46), and the upper and lower end surfaces of the rotating rod (52) corresponding to the rack groove (46) are provided with limiting parts (54), and the limiting parts (54) are used to limit the gear (53) from disengaging from the rack groove (46).

5. The sand and gravel screening device according to claim 4, characterized in that: The driving motor (51) is fixedly connected to the lifting member (6), and the lifting member (6) includes a hydraulic telescopic rod fixed to the side wall of the shell (1), and the telescopic end of the hydraulic telescopic rod is connected to a fixed plate. The driving motor (51) is fixed to the fixed plate. The expansion of the hydraulic telescopic rod drives the fixed plate to rise, and then the vibrating member (5) tilts the screening box (41), thereby achieving the discharge of sand and gravel that have not been screened out of the screening box (41) through the discharge port (3).

6. The sand and gravel screening device according to claim 4, characterized in that: The driving motor (51) is fixedly connected to the lifting member (6), and the lifting member (6) includes a slot arranged at the upper end of the shell (1), and a first screw rod and a second screw rod are arranged in the slot, and the first screw rod and the second screw rod are commonly connected to a lifting plate, and the driving motor (51) is fixed to the lifting plate, and a first motor is arranged at the upper end of the first screw rod, and the second screw rod rotates synchronously with the first screw rod through a transmission member, thereby realizing the lifting plate moving up and down along the length of the screw rod.

7. The sand and gravel screening device according to claim 5 or 6, characterized in that: The limiting part (54) comprises a first limiting plate (541) and a second limiting plate (542), wherein the first limiting plate (541) and the second limiting plate (542) are connected via a rotating shaft, an insert rod (543) is movably connected to the first limiting plate (541), a plug hole (544) is provided on the second limiting plate (542) corresponding to the plug rod (543), and a through hole (521) is provided on the rotating rod (52) corresponding to the plug hole (544), and the plug rod (543) passes through the through hole (521) and is plugged into the plug hole (544).

8. The sand and gravel screening device according to claim 7, characterized in that: The screening box (41) comprises a rectangular frame (9) and a screen (10) fixed on the rectangular frame (9); or the screening box (41) comprises a screening bottom plate (11), the left and right sides of the screening bottom plate (11) are provided with side baffles (12) extending upward, the end surface of the screening bottom plate (11) facing the discharge port (3) is hinged with an expansion plate (13), the two end surfaces of the expansion plate (13) are slidably connected to the left and right side baffles (12), and the end surface of the screening bottom plate (11) facing the through slot (7) is provided with a rear baffle (14), the height of the rear baffle (14) is the same as that of the through slot (7).

9. The sand and gravel screening device according to claim 8, characterized in that: The left and right side baffles (12) are provided with arc-shaped slide grooves (15) corresponding to the unfolding plate (13); an arc-shaped plate (16) is detachably connected to the opening of the arc-shaped slide groove (15); a guide groove (17) is provided on the arc-shaped plate (16); a through rod is provided on the unfolding plate (13) corresponding to the guide groove (17); a sliding block is provided at the end of the through rod corresponding to the arc-shaped slide groove (15); and a tension spring is provided between the sliding block and the arc-shaped slide groove (15).

10. The sand and gravel screening device according to claim 9, characterized in that: A buffer discharge member (18) is provided between upper and lower adjacent screening boxes (41), and the buffer discharge member (18) comprises a collecting barrel (181), and a spiral plate (182) is provided inside the collecting barrel (181) for moving sand and gravel to the next screening box (41).

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