Gravel grading screening device

Abstract

When a first screen hole needs to be dredged, screened gravel can be discharged out of a vibration screening box, then a shielding mechanism is operated to remove shielding of an inlet and an outlet, and then a lifting assembly is operated to drive an upward pushing assembly to descend, so that the first screen hole is dredged, and the first screen hole is dredged. Then the first linear driving part is operated to move the upward pushing assembly to the position below the first through hole assembly, then the upward pushing assembly is operated to be connected with the lower portion of the adsorbed plate, then the adsorption force of the first adsorption part on the adsorbed plate is relieved, and then the first linear driving part is operated to move the upward pushing assembly to the position below the first through hole assembly; and the first linear driving piece conveys the dredging roller to the position below the first screen hole through the upward pushing assembly, then the upward pushing assembly is operated, and the upward pushing assembly drives the dredging roller to dredge the first screen hole.

Description

TECHNICAL FIELD

[0001] The utility model relates to sandstone grading and screening technical field especially relates to sandstone grading and screening device. BACKGROUND

[0002] Sandstone refers to the loose mixture of sand and gravel, and sandstone is widely used in the fields of house, road, highway, railway and engineering as high-quality building material and concrete raw material due to its good hardness and stable chemical property, sandstone needs to be screened after being obtained so as to be applied in different fields subsequently, therefore, a sandstone grading and screening device is required.

[0003] Most of the existing sandstone is screened by using screen mesh, and many stones with a size equivalent to the size of the mesh hole of the screen mesh will block the mesh hole in the process of using the screen mesh, the sandstone in the mesh hole cannot be removed well by the traditional screening device, so that the mesh hole is blocked, the working efficiency is affected, and even the machine is damaged. UTILITY MODEL CONTENT

[0004] (I) technical problem to be solved

[0005] In order to solve the above problems in the prior art, the utility model provides a sandstone grading and screening device, which can more conveniently and efficiently clean and dredge the screen holes on the screen mesh, so that the screen mesh can better screen sandstone and improve the screening efficiency.

[0006] (II) technical scheme

[0007] In order to achieve the above purpose, the utility model adopts the main technical scheme including:

[0008] A sandstone grading and screening device, which comprises a grading and screening mechanism, a shielding mechanism and a dredging mechanism, one side of the grading and screening mechanism is provided with an inlet and outlet of the dredging mechanism, the dredging mechanism is arranged on the side of the grading and screening mechanism close to the inlet and outlet, and is movably connected with the inlet and outlet and connected with the grading and screening mechanism;

[0009] The grading and screening mechanism comprises a vibrating screening box, a first screen disc and a second screen disc, the first screen disc and the second screen disc are arranged in the vibrating screening box from top to bottom, a plurality of first screen holes are arranged on the first screen disc, a plurality of second screen holes are arranged on the second screen disc, the diameter of the first screen hole is larger than that of the second screen hole, and a feeding port is arranged on the upper part of the vibrating screening box;

[0010] The dredging mechanism comprises a rack, a lifting assembly, a first linear drive, an upward pushing assembly, a first through hole assembly and a second through hole assembly, the rack is fixedly connected with a side of the vibrating screen sub-box close to the inlet and outlet, the first screen disc is provided below the first through hole assembly, the second screen disc is provided below the second through hole assembly, the first through hole assembly and the second through hole assembly are connected with the side of the rack close to the inlet and outlet, the side of the rack away from the inlet and outlet is provided with the lifting assembly, the lifting assembly is connected with the upward pushing assembly through the first linear drive, and the upward pushing assembly is detachably connected with the first through hole assembly and the second through hole assembly respectively.

[0011] The first through hole assembly and the second through hole assembly are the same in structure.

[0012] The first through hole assembly comprises an L-shaped placing rack, an adsorbed plate, a plurality of dredging rollers and a first suction accessory, the L-shaped placing rack is connected with the side of the rack close to the inlet and outlet, the L-shaped placing rack is provided with the first suction accessory, the lower part of the adsorbed plate is detachably connected with the first suction accessory, the upper part of the adsorbed plate is provided with a plurality of the dredging rollers arranged in an array, and the upward pushing assembly is detachably connected with the adsorbed plate.

[0013] Further, the upward pushing assembly comprises a mounting plate, a second linear drive, an upward pushing plate and a second suction accessory, the first linear drive is drivingly connected with the mounting plate, the lower part of the second linear drive is detachably connected with the mounting plate, the upper part of the second linear drive is linearly drivingly connected with the lower part of the upward pushing plate, the upper part of the upward pushing plate is provided with the second suction accessory, and the second suction accessory is detachably connected with the adsorbed plate.

[0014] Further, the lifting assembly comprises a rotating drive, a screw rod, a slide rod and a lifting plate, the side of the rack away from the inlet and outlet is provided with a plurality of the slide rods, the lifting plate is slidably connected with the plurality of slide rods, the screw rod is arranged in the middle of the lifting plate and is rotatably connected with the rack, the rotating drive is drivingly connected with the screw rod, and the first linear drive is connected with the lifting plate.

[0015] Further, the shielding mechanism comprises two third linear drives and a baffle, the baffle is slidably connected with the side of the rack close to the inlet and outlet, and the third linear drives are linearly drivingly connected with the baffle.

[0016] Further, the vibrating screening box comprises a box body, vibrating motors, a base and springs, the bottom of the box body is connected with the base through the springs, vibrating motors are arranged on the two sides of the box body, the first screen disc and the second screen disc are connected with the inside of the box body, and the upper part of the box body is provided with the feeding port.

[0017] Further, the vibrating screening box comprises a box body, vibrating motors, a base and springs, the bottom of the box body is connected with the base through the springs, vibrating motors are arranged on the two sides of the box body, the first screen disc and the second screen disc are connected with the inside of the box body, and the upper part of the box body is provided with the feeding port.

[0018] Further, the vibrating screening box comprises a box body, vibrating motors, a base and springs, the bottom of the box body is connected with the base through the springs, vibrating motors are arranged on the two sides of the box body, the first screen disc and the second screen disc are connected with the inside of the box body, and the upper part of the box body is provided with the feeding port.

[0019] (Three) beneficial effects

[0020] The utility model discloses beneficial effect is: when needing to carry out the classification screening to sandstone in actual use process, can throw sandstone through the upper part of vibrating screening box on the first screen disc, then run vibrating screening box, make vibrating screening box drive the first screen disc and the second screen disc and shake, thereby make the sandstone on the first screen disc greater than the first screen hole and remain on the first screen disc, and the sandstone less than the first screen hole falls into the second screen disc and carries out the next stage screening, then the sandstone less than the second screen hole falls into the lower part of vibrating screening box, when needing to dredge the first screen hole, can first discharge the screened sandstone from vibrating screening box outside, then run the shielding mechanism, make the shielding mechanism remove the shielding of import and export, then run the lifting assembly, make the lifting assembly drive the push-up assembly and drop, then run the first linear drive, make the first linear drive move the push-up assembly to the first through -hole assembly below, then run the push-up assembly, make the push-up assembly and the adsorbed plate lower part connect, then remove the adsorption of the first suction element to the adsorbed plate, then run the first linear drive, make the first linear drive through the push-up assembly and send the dredging roller to the first screen hole below, then run the push-up assembly, make the push-up assembly drive the dredging roller and dredge the first screen hole, when needing to dredge the second screen hole, can run the first linear drive and the push-up assembly, make the first linear drive and the push-up assembly drive the dredging roller on the adsorbed plate and reset to the L type rest on, then run the first suction element, make the first suction element adsorb the adsorbed plate, then run the lifting assembly and the first linear drive, make the push-up assembly move to the second through -hole assembly and connect, and dredge the second screen hole, thereby can more convenient and efficient to clean and dredge the screen hole on the screen, thereby make the screen better screen the sandstone, improve the screening efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1The overall structure schematic view of the sand grading and screening device of the embodiment of the present application;

[0022] Figure 2 The overall structure sectional view of the sand grading and screening device of the embodiment of the present application;

[0023] Figure 3 The overall structure sectional view of the sand grading and screening device of the embodiment of the present application;

[0024] Figure 4 The dredging mechanism schematic view of the sand grading and screening device of the embodiment of the present application;

[0025] Figure 5 The dredging mechanism side view of the sand grading and screening device of the embodiment of the present application;

[0026]

Explanation of the reference signs

[0027] The first through hole assembly 1, the lifting assembly 2, the first linear driving part 3, the second through hole assembly 4, the vibration motor 5, the spring 6, the base 7, the box 8, the feeding port 9, the valve body 10, the first sieve hole 11, the second sieve hole 12, the second sieve disc 13, the first sieve disc 14, the upward pushing assembly 15, the rack 16, the L-shaped placing rack 101, the adsorbed plate 102, the dredging roller 103, the first adsorption accessory 104, the rotating driving part 201, the sliding rod 202, the lifting plate 203, the screw rod 204, the second adsorption accessory 1501, the upward pushing plate 1502, the mounting plate 1503, and the second linear driving part 1504. DETAILED DESCRIPTION

[0028] In order to better explain the present application, so as to facilitate understanding, the present application is described in detail in combination with the specific embodiments and the accompanying drawings.

[0029] Please refer to Figures 1 to 5 The present application relates to a sand grading and screening device, which comprises a grading and screening mechanism, a shielding mechanism and a dredging mechanism.

[0030] The grading and screening mechanism comprises a vibrating screening box, a first sieve disc 14 and a second sieve disc 13, the vibrating screening box is internally provided with the first sieve disc 14 and the second sieve disc 13 from top to bottom, a plurality of first sieve holes 11 are arranged on the first sieve disc 14, a plurality of second sieve holes 12 are arranged on the second sieve disc 13, the aperture of the first sieve hole 11 is larger than that of the second sieve hole 12, and the vibrating screening box is provided with a feeding port 9 at the upper portion.

[0031] The dredging mechanism comprises a rack 16, a lifting assembly 2, a first linear drive 3, a pushing-up assembly 15, a first through-hole assembly 1 and a second through-hole assembly 4, the rack 16 is fixedly connected with the vibrating screen box at a side close to the inlet and outlet, the first through-hole assembly 1 is arranged below the first screen plate 14, the second through-hole assembly 4 is arranged below the second screen plate 13, the first through-hole assembly 1 and the second through-hole assembly 4 are connected with the rack 16 at a side close to the inlet and outlet, the lifting assembly 2 is arranged at a side of the rack 16 away from the inlet and outlet, the lifting assembly 2 is connected with the pushing-up assembly 15 through the first linear drive 3, and the pushing-up assembly 15 is detachably connected with the first through-hole assembly 1 and the second through-hole assembly 4 respectively.

[0032] The first through-hole assembly 1 and the second through-hole assembly 4 are the same in structure.

[0033] The first through-hole assembly 1 comprises an LL-type placing rack 101, an adsorbed plate 102, a plurality of dredging rollers 103 and a first adsorption accessory 104, the LL-type placing rack 101 is connected with the rack 16 at a side close to the inlet and outlet, the LL-type placing rack 101 is provided with the first adsorption accessory 104, the lower part of the adsorbed plate 102 is detachably connected with the first adsorption accessory 104, the upper part of the adsorbed plate 102 is provided with a plurality of the dredging rollers 103 arranged in an array, and the pushing-up assembly 15 is detachably connected with the adsorbed plate 102.

[0034] The utility model discloses a working principle as follows: when needing to carry out grading screening to sandstone in actual use, can put sandstone through the upper part of vibration screening box on the first screen disc 14, then run vibration screening box, make vibration screening box drive first screen disc 14 and second screen disc 13 shake, thereby make the sandstone on first screen disc 14 greater than the first sieve hole 11 and remain above first screen disc 14, and the sandstone less than the first sieve hole 11 falls into second screen disc 13 and carries out next stage screening, then the sandstone less than second sieve hole 12 falls into the lower part of vibration screening box, when needing to dredge first sieve hole 11, can first discharge the screened sandstone outside vibration screening box, then run shielding mechanism, make shielding mechanism remove the shielding of import and export, then run lifting assembly 2, make lifting assembly 2 drive push-up assembly 15 and descend, then run first linear drive 3, make first linear drive 3 move push-up assembly 15 to below first through-hole assembly 1, then run push-up assembly 15, make push-up assembly 15 connect with the lower part of adsorbed plate 102, then remove the adsorption of first suction member 104 to adsorbed plate 102, then run first linear drive 3, make first linear drive 3 convey dredging roller 103 to below first sieve hole 11 through push-up assembly 15, then run push-up assembly 15, make push-up assembly 15 drive dredging roller 103 and dredge first sieve hole 11, when needing to dredge second sieve hole 12, can run first linear drive 3 and push-up assembly 15, make first linear drive 3 and push-up assembly 15 drive the dredging roller 103 on adsorbed plate 102 and reset to LL type rack 101, then run first suction member 104, make first suction member 104 adsorb adsorbed plate 102, then run lifting assembly 2 and first linear drive 3, make push-up assembly 15 move to connect at second through-hole assembly 4 and dredge second sieve hole 12.

[0035] Further, the push-up assembly 15 includes a mounting plate 1503, a second linear drive 1504, a push-up plate 1502, and a second suction member 1501. The first linear drive 3 is drivingly connected to the mounting plate 1503. The second linear drive 1504 is detachably connected to the lower part of the mounting plate 1503. The upper part of the second linear drive 1504 is linearly drivingly connected to the lower part of the push-up plate 1502. The second suction member 1501 is arranged on the upper part of the push-up plate 1502. The second suction member 1501 is detachably connected to the adsorbed plate 102.

[0036] From the above description, it is beneficial when the first screen hole 11 needs to be dredged, the mounting plate 1503 is pushed to the first through hole assembly 1 by the first linear drive 3, then the second linear drive 1504 is operated, the second linear drive 1504 drives the second suction accessory 1501 to adhere to the suction plate 102 through the push plate, then the second suction accessory 1501 is operated, the second suction accessory 1501 is adsorbed to the suction plate 102, and the adsorption force of the first suction accessory 104 to the suction plate 102 is released, then the first linear drive 3 is operated, the first linear drive 3 moves the dredging roller 103 to the lower side of the first screen hole 11 through the push-up assembly 15, and then the second linear drive 1504 is operated, the second linear drive 1504 drives the dredging roller 103 to perform the dredging action on the first screen hole 11 through the push-up plate 1502.

[0037] Further, the lifting assembly 2 comprises a rotating drive 201, a screw rod 204, a sliding rod 202 and a lifting plate 203, the side of the rack 16 away from the inlet and outlet is provided with a plurality of sliding rods 202, the lifting plate 203 is slidably connected with the plurality of sliding rods 202, the screw rod 204 is arranged in the middle of the lifting plate 203 and is rotatably connected with the rack 16, the rotating drive 201 is drivingly connected with the screw rod 204, and the first linear drive 3 is connected with the lifting plate 203.

[0038] From the above description, it is beneficial when the first screen hole 11 needs to be dredged, the first linear drive 3 is operated to drive the push-up assembly 15 to move to the lower side of the first through hole assembly 1 or the second through hole assembly 4 through the first linear drive 3, so that the push-up assembly 15 drives the first through hole assembly 1 or the second through hole assembly 4 to dredge the first screen disc 14 and the second screen disc 13.

[0039] Further, the shielding mechanism comprises two third linear drives and a baffle, the baffle is slidably connected with the side of the rack 16 close to the inlet and outlet, and the third linear drives are linearly drivingly connected with the baffle.

[0040] From the above description, it is beneficial when the first screen hole 11 needs to be dredged, the first linear drive 3 is operated to drive the push-up assembly 15 to move to the lower side of the first through hole assembly 1 or the second through hole assembly 4 through the first linear drive 3, so that the push-up assembly 15 drives the first through hole assembly 1 or the second through hole assembly 4 to dredge the first screen disc 14 and the second screen disc 13.

[0041] Further, the vibrating screening box comprises a box body 8, a vibrating motor 5, a base 7 and springs 6, the bottom of the box body 8 is connected with the base 7 through the springs 6, one vibrating motor 5 is arranged on each side of the box body 8, the first screen plate 14 and the second screen plate 13 are connected with the inside of the box body 8, and the upper portion of the box body 8 is provided with the feeding port 9.

[0042] From the above description, it can be known that when sand and gravel need to be classified and screened, the sand and gravel can be input into the box body 8 through the feeding port 9, then the sand and gravel fall above the first screen plate 14, then the vibrating motor 5 is operated to drive the first screen plate 14 and the second screen plate 13 to shake, so that the sand and gravel larger than the first screen hole 11 remain on the first screen plate 14, the sand and gravel smaller than the first screen hole 11 fall on the second screen plate 13 for re-screening, and the second screen plate 13 retains the sand and gravel larger than the second screen hole 12 above the second screen plate 13 during screening, and the sand and gravel smaller than the second screen hole 12 fall into the lower portion of the box body 8 for collection.

[0043] Further, the valve body 10 is arranged, the box body 8 is provided with a discharging port above the first screen plate 14, above the second screen plate 13 and below the second screen plate 13, and the discharging port is provided with the valve body 10.

[0044] From the above description, it can be known that after the sorting is completed, the valve body 10 can be operated to open the discharging port, and then the screened sand and gravel is discharged outside the device for collection.

[0045] Further, the PLC controller is arranged, and the PLC controller is electrically connected with the classification and screening mechanism, the shielding mechanism and the dredging mechanism.

[0046] From the above description, it can be known that the parameters of the sand and gravel classification and screening device can be adjusted through the PLC controller, and the operation of the sand and gravel classification and screening device is more convenient. Embodiment one

[0047] Please refer to Figures 1 to 5 A sand and gravel classification and screening device, comprising a classification and screening mechanism, a shielding mechanism and a dredging mechanism, one side of the classification and screening mechanism is provided with an inlet and outlet of the dredging mechanism, the dredging mechanism is arranged on the side of the classification and screening mechanism close to the inlet and outlet, and is movably connected with the inlet and outlet and connected with the classification and screening mechanism.

[0048] The grading screening mechanism comprises a vibrating screening box, a first screen deck 14 and a second screen deck 13, the vibrating screening box is internally provided with the first screen deck 14 and the second screen deck 13 from top to bottom, a plurality of first screen holes 11 are arranged on the first screen deck 14, a plurality of second screen holes 12 are arranged on the second screen deck 13, the first screen holes 11 are larger than the second screen holes 12 in diameter, and a feeding port 9 is arranged on the upper portion of the vibrating screening box;

[0049] The dredging mechanism comprises a rack 16, a lifting assembly 2, a first linear drive 3, an upper pushing assembly 15, a first through-hole assembly 1 and a second through-hole assembly 4, the rack 16 is fixedly connected to the vibrating screening box on the side close to the inlet and outlet, the first screen deck 14 is provided below the first through-hole assembly 1, the second screen deck 13 is provided below the second through-hole assembly 4, the first through-hole assembly 1 and the second through-hole assembly 4 are connected to the rack 16 on the side close to the inlet and outlet, the rack 16 is provided with the lifting assembly 2 on the side away from the inlet and outlet, the lifting assembly 2 is connected to the upper pushing assembly 15 through the first linear drive 3, and the upper pushing assembly 15 is detachably connected to the first through-hole assembly 1 and the second through-hole assembly 4 respectively;

[0050] The first linear drive 3 is an electric cylinder, which is favorable for more accurately moving the dredging roller 103 to below the first screen hole 11 or the second screen hole 12 to perform the dredging action;

[0051] The first through-hole assembly 1 and the second through-hole assembly 4 are of the same structure;

[0052] The first through-hole assembly 1 comprises an LL-type placing rack 101, an adsorbed plate 102, a plurality of dredging rollers 103 and a first adsorption accessory 104, the LL-type placing rack 101 is connected to the rack 16 on the side close to the inlet and outlet, the first adsorption accessory 104 is arranged on the LL-type placing rack 101, the lower portion of the adsorbed plate 102 is detachably connected to the first adsorption accessory 104, the upper portion of the adsorbed plate 102 is provided with a plurality of the dredging rollers 103 arranged thereon, and the upper pushing assembly 15 is detachably connected to the adsorbed plate 102;

[0053] The upper pushing assembly 15 comprises a mounting plate 1503, a second linear drive 1504, an upper pushing plate 1502 and a second suction accessory 1501, the first linear drive 3 is drivingly connected with the mounting plate 1503, the lower part of the second linear drive 1504 is detachably connected with the mounting plate 1503, the upper part of the second linear drive 1504 is linearly drivingly connected with the lower part of the upper pushing plate 1502, the upper part of the upper pushing plate 1502 is provided with the second suction accessory 1501, and the second suction accessory 1501 is detachably connected with the suctioned plate 102;

[0054] The second linear drive 1504 is a gas cylinder;

[0055] The suctioned accessories are all made of metal materials capable of being attracted by electromagnets;

[0056] The first suction accessory 104 and the second suction accessory 1501 are both electromagnets;

[0057] The lifting assembly 2 comprises a rotating drive 201, a screw rod 204, a sliding rod 202 and a lifting plate 203, the machine frame 16 is provided with a plurality of sliding rods 202 away from the side of the inlet and outlet, the lifting plate 203 is slidably connected with the plurality of sliding rods 202, the screw rod 204 is arranged in the middle of the lifting plate 203 and is rotatably connected with the machine frame 16, the rotating drive 201 is drivingly connected with the screw rod 204, and the first linear drive 3 is connected with the lifting plate 203;

[0058] The lifting plate 203 is provided with a through hole in the middle, and the through hole is internally provided with an internal thread matched with the screw rod 204, and the internal thread is engaged with the screw rod 204;

[0059] The rotating drive 201 is a stepping motor, which is beneficial to better control the rotation number of the screw rod 204, so as to control the lifting height of the upper pushing assembly 15, and facilitate the better connection of the upper pushing assembly 15 with the first through hole assembly 1 and the second through hole assembly 4;

[0060] The shielding mechanism comprises two third linear drives and a baffle, the baffle is slidably connected with the side of the machine frame 16 close to the inlet and outlet, and the third linear drives are linearly drivingly connected with the baffle;

[0061] The third linear drives are gas cylinders;

[0062] Both ends of the baffle are provided with a third linear drive, the third linear drive is drivingly connected with the baffle, and the third linear drive is detachably connected with the outer surface of the machine frame 16;

[0063] The vibrating screening box comprises a box body 8, a vibrating motor 5, a base 7 and springs 6, the bottom of the box body 8 is connected with the base 7 through the springs 6, one vibrating motor 5 is arranged on each side of the box body 8, the first screen plate 14 and the second screen plate 13 are connected with the inside of the box body 8, and the upper portion of the box body 8 is provided with the feeding port 9;

[0064] The box body 8 is arranged above the first screen plate 14 and the second screen plate 13 and below the second screen plate 13, and a discharge port is arranged inside each discharge port and is provided with a valve body 10;

[0065] The valve body 10 is a butterfly valve;

[0066] The PLC controller is electrically connected with the grading screening mechanism, the shielding mechanism and the dredging mechanism;

[0067] The PLC controller is a DATA-7311 type, and is electrically connected with the first linear driving part 3, the second linear driving part 1504, the third linear driving part, the first suction accessory 104, the second suction accessory 1501, the rotating driving part 201, the vibrating motor 5 and the valve body 10.

[0068] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above, and the standard parts used in the utility model can be purchased from the market, the special-shaped parts can be ordered according to the description and the drawings, the specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art, the mechanical parts and equipment adopt conventional types in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, which will not be described in detail here.

[0069] The above is only an embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent transformation or direct or indirect application in the related technical field according to the content of the utility model specification and drawings is also included in the patent protection range of the utility model.

Claims

1. A grit sizing apparatus, characterised in that: The application relates to a screening device, which comprises a grading screening mechanism, a shielding mechanism and a dredging mechanism. The grading screening mechanism comprises a vibrating screening box, a first screening disc and a second screening disc. The dredging mechanism comprises a rack, a lifting assembly, a first linear driving element, an upward pushing assembly, a first through-hole assembly and a second through-hole assembly. The first through-hole assembly and the second through-hole assembly are connected to the rack. The first through-hole assembly comprises an L-shaped placing rack, an adsorbed plate, a plurality of dredging rollers and a first adsorption element.

2. The sand classification and sizing apparatus of claim 1, wherein: The upward pushing assembly comprises a mounting plate, a second linear driving element, an upward pushing plate and a second adsorption element.

3. The sand classification and sizing apparatus of claim 1, wherein: The lifting assembly comprises a rotating driving element, a screw rod, a sliding rod and a lifting plate.

4. The sand classification and sizing apparatus of claim 1, wherein: The shielding mechanism comprises two third linear driving elements and a baffle.

5. The sand classification and sizing apparatus of claim 1, wherein: The vibrating screening box comprises a box body, vibrating motors, a base and springs, the bottom of the box body is connected with the base through a plurality of springs, both sides of the box body are provided with a vibrating motor, the first screen disc and the second screen disc are connected with the inside of the box body, and the upper part of the box body is provided with the feeding port.

6. The sand classification and sizing apparatus of claim 5, wherein: The box body is located above the first screen disc, above the second screen disc and below the second screen disc, and is provided with a discharge port, and the discharge port is provided with a valve body.

7. The sand classification and sizing apparatus of claim 1, wherein: The PLC controller is electrically connected with the grading screening mechanism, the shielding mechanism and the dredging mechanism.

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