Dewatering screen for sand-mud separation

Abstract

The invention relates to the technical field of screening equipment, and provides a dewatering screen for sand-mud separation, the dewatering screen comprises a base, a screen box and a vibration motor, the screen box is mounted on the base through a plurality of rubber springs, and the vibration motor is mounted on the screen box; a first-level screen and a second-level screen are arranged in the screen box from bottom to top in a supporting mode, and meshes of the second-level screen are smaller than those of the first-level screen. A first muddy water collecting tank is arranged on the base, and a swirler is further arranged on the base in a supporting manner; a cyclone bottom flow port is located above the feeding end of the second-stage screen, a first slurry pump is arranged on one side of the first muddy water collecting tank, the water inlet end of the first slurry pump is communicated with the first muddy water collecting tank, and the water outlet end of the first slurry pump is communicated with a tangential feeding port of the cyclone. According to the recycling device, small-particle-size gravel in muddy water generated by the dewatering screen is recycled, and resource waste is effectively reduced.

Description

Technical Field

[0001] The present application relates to the field of screening equipment, and in particular to a dewatering screen for sand-mud separation. Background Art

[0002] Artificial sand is a green building material made from ore or rock through sand making equipment through steps such as crushing and screening. The production and use of artificial sand can effectively alleviate the traditional mining of natural river sand and effectively reduce the damage to the river's ecological environment.

[0003] Currently, most artificial sand is made by wet sand making process. Compared with dry sand making process, after the artificial sand production is completed, the wet sand making process uses sand washing equipment to wash the finished artificial sand, which effectively removes a large amount of dust contained in the artificial sand layer and reduces the dust overflow caused by the artificial sand production process, which seriously pollutes the surrounding environment.

[0004] After being washed by the sand washer, the machine-made sand needs to be dehydrated by a dewatering screen to remove a large amount of mud and water carried in the machine-made sand. In the related art, the dewatering screen includes a base, a screen box and a vibration motor, wherein the screen box is mounted on the base through a number of rubber springs, a screen is installed in the screen box, and the vibration motor is mounted on the screen box. When the dewatering screen is in operation, the machine-made sand to be dehydrated is discharged into the feed end of the screen, and the screen box is driven to vibrate by the vibrator on the screen box, so that the machine-made sand on the feed end of the screen moves toward the discharge end of the screen, and is finally discharged through the discharge end. During the movement of the screen, the accompanying mud and water are discharged through the sieve holes on the screen to achieve mud and sand separation.

[0005] With regard to the above-mentioned related technologies, the muddy water filtered out through the dewatering screen usually contains a lot of small-sized sand and gravel. On the one hand, it is easy to cause waste of resources. On the other hand, due to the small-sized sand and gravel attached to the muddy water, the difficulty of subsequent treatment of the muddy water generated by the dewatering screen is greatly increased. Therefore, there is room for improvement. Summary of the invention

[0006] In order to reduce waste of resources and at the same time lower the difficulty of handling muddy water generated by subsequent dewatering screens, the present application provides a dewatering screen for sand-mud separation.

[0007] The present application provides a dewatering screen for sand and mud separation, which adopts the following technical solution: A dewatering screen for sand-mud separation, comprising a base, a screen box and a vibration motor, wherein the screen box is mounted on the base through a plurality of rubber springs, and the vibration motor is mounted on the screen box; A primary screen and a secondary screen are supported in the screen box from bottom to top, and the mesh size of the secondary screen is smaller than that of the primary screen; the feed end of the secondary screen is staggered with the feed end of the primary screen; The base is provided with a first mud and water collecting trough, and the first mud and water collecting trough is located below the first-level screen; a cyclone is also supported on the base; the bottom flow port of the cyclone is located above the feed end of the second-level screen, and a first slurry pump is provided on one side of the first mud and water collecting trough, and the water inlet end of the first slurry pump is connected with the first mud and water collecting trough through a first water inlet pipe, and the water outlet end of the first slurry pump is connected with the tangential feed port of the cyclone through a first water outlet pipe.

[0008] By adopting the above technical scheme, the machine-made sand cleaned by the sand washing machine is discharged into the feed end of the first-level screen, and the screen box is driven to vibrate by the vibration motor on the screen box; the machine-made sand entering the first-level screen moves toward the discharge end of the first-level screen under the action of the vibration motor, during which the mud and water carried by the machine-made sand fall into the first mud and water collecting tank through the mesh holes on the first-level screen; the mud and water in the first mud and water collecting tank are pumped out by the first slurry pump on one side of the first mud and water collecting tank and discharged into the cyclone, and the small-sized sand and gravel attached to the mud and water are sorted by the cyclone, and the small-sized sand and gravel sorted by the cyclone carry a small part of the mud and water and are discharged into the second-level screen through the bottom flow port at the bottom of the cyclone, and move toward the discharge end of the second-level screen under the action of the vibration motor and are discharged through the discharge end of the second-level screen, during which the small-sized sand and gravel with a small part of the mud and water fall into the first mud and water collecting tank through the mesh holes of the second-level screen and the first-level screen. Effectively recovering the small-sized sand and gravel in the muddy water can help reduce the waste of resources and reduce the difficulty of subsequent treatment of the muddy water produced by the dewatering screen.

[0009] Preferably, a second mud and water collecting tank is further provided on one side of the base, and the overflow port at the top of the cyclone is connected to the second mud and water collecting tank through a drainage pipe.

[0010] By adopting the above technical solution, the muddy water generated during the cyclone sorting process can be discharged into the second muddy water collection tank through the drainage pipe for storage, thereby realizing the centralized collection of the muddy water generated by the cyclone and facilitating the subsequent centralized treatment of the muddy water.

[0011] Preferably, a second slurry pump is provided on one side of the second mud and water collecting tank, the water inlet end of the second slurry pump is connected to the second mud and water collecting tank through a second water inlet pipe, and the water outlet end of the second slurry pump is connected to the first mud and water collecting tank through a second water outlet pipe.

[0012] By adopting the above technical scheme, the second slurry pump is used to pump the muddy water in the second muddy water collecting tank into the first muddy water collecting tank. On the one hand, the muddy water pumped into the first muddy water collecting tank by the second slurry pump disturbs the original muddy water in the first muddy water collecting tank, which is beneficial to reduce the deposition of small-sized sand and gravel in the muddy water in the first muddy water collecting tank at the bottom of the first muddy water collecting tank; on the other hand, it is beneficial to replenish the muddy water in the first muddy water collecting tank, so that the muddy water in the first muddy water collecting tank is always maintained at a higher water level, thereby facilitating the first slurry pump to better pump the muddy water in the first muddy water collection tank into the cyclone.

[0013] Preferably, a water distribution assembly is provided at the bottom of the inner cavity of the first mud and water collection tank, and the water distribution assembly includes a water distribution main pipe, and the two ends of the water distribution main pipe respectively extend to the opposite ends of the inner cavity of the first mud and water collection tank. The water distribution main pipe is radially connected to a plurality of water distribution branch pipes, and the water distribution branch pipes are provided with a plurality of water permeable holes.

[0014] By adopting the above technical scheme, the muddy water pumped out from the second mud and water collecting tank by the second slurry pump flows into the water distribution main pipe through the outlet pipe, and flows out through the water holes on the water distribution branch pipes at various locations. This is conducive to the muddy water pumped into the first slurry pump by the second slurry pump to disturb the original muddy water in the first mud and water collecting tank more comprehensively and evenly, effectively reducing the existence of dead corners of mud water flow in the first mud and water collecting tank.

[0015] Preferably, a first overflow pipe is connected to the top of the first mud and water collecting tank, and one end of the first overflow pipe away from the first mud and water collecting tank is connected to the second mud and water collecting tank.

[0016] By adopting the above technical solution and setting up the first overflow pipe, excess mud and water in the first mud and water collecting tank can flow into the second mud and water collecting tank through the first overflow pipe, which is helpful to reduce the overflow caused by excess mud and water in the first mud and water collecting tank.

[0017] Preferably, a connecting shaft is coaxially penetrated in the first overflow pipe, and a spiral blade is circumferentially connected to the connecting shaft, and the outer periphery of the spiral blade is abutted against the inner periphery of the first overflow pipe; the second mud and water collecting trough is provided with a rotary driving component, and the rotary driving component is drivingly connected to the connecting shaft for driving the connecting shaft to rotate.

[0018] By adopting the above technical solution, the rotary driving member is used to drive the connecting shaft to drive the spiral blade to rotate, and the rotating connecting shaft and the spiral blade are used to push the mud and water in the first mud and water collecting tank into the second mud and water collecting tank through the first overflow pipe; on the one hand, it is helpful to speed up the discharge of excess mud and water in the first mud and water collecting tank into the second mud and water collecting tank, and on the other hand, it is helpful to reduce the adhesion of mud and sand and gravel in the mud and water to the inner wall of the first overflow pipe, causing blockage of the first overflow pipe.

[0019] Preferably, the second water outlet pipe is connected to a flushing pipe, an on-off valve is installed at the flushing pipe, and the flushing pipe is connected to a clean water source.

[0020] By adopting the above technical solution, by arranging a flushing pipe on the second water outlet pipe, clean water can be pumped into the water outlet pipe, the water distribution main pipe and the water distribution branch pipe through the flushing pipe on a regular basis to flush the above pipes, which is beneficial to reduce the blockage of the inside of the pipeline by mud and the like; by setting the on-off valve, in the process of daily pumping the mud and water in the second mud and water collection tank into the first mud and water collection tank through the second slurry pump, the flushing pipe can be closed by the on-off valve to limit the mud and water flowing through the second water outlet pipe from flowing into the flushing pipe, which is beneficial to the mud and water pumped out by the second slurry pump to be discharged into the first mud and water collection tank more concentratedly through the second water outlet pipe.

[0021] Preferably, a first air knife and a second air knife are respectively supported at the bottom of the feed ends of the primary screen and the secondary screen, the air outlet of the first air knife is arranged toward the primary screen, and the air outlet of the second air knife is arranged toward the secondary screen.

[0022] By adopting the above technical solution, the first air knife and the second air knife are used to blow compressed air toward the bottom of the discharge ends of the primary screen and the secondary screen respectively. On the one hand, it is beneficial to reduce the adhesion between sand and gravel and the primary screen and the secondary screen, and reduce the pile of materials at the feed ends of the primary screen and the secondary screen. On the other hand, it can reduce the situation where small particles of impurities clog the mesh holes of the primary screen and the secondary screen, affecting the overall drainage effect of the screen.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. While the dewatering screen is dewatering the machine-made sand discharged from the sand washing machine, the muddy water generated by the dewatering of the machine-made sand is transported to the cyclone by the first slurry pump. The cyclone is used to separate the muddy water and the small-sized sand and gravel it carries. After the small-sized sand and gravel are separated by the cyclone, they are discharged into the secondary screen of the screen box through the bottom flow port at the bottom of the cyclone. The water carried by the small-sized sand and gravel is further separated by the vibration motor in conjunction with the secondary screen, so that the small-sized sand and gravel carried in the muddy water can be collected. On the one hand, it is beneficial to reduce the waste of resources, and on the other hand, it is beneficial to reduce the difficulty of handling the muddy water generated by the subsequent dewatering screen.

[0024] 2. Install a second slurry pump between the first mud and water collecting tank and use the second slurry pump to pump the mud and water in the second mud and water collecting tank into the first mud and water collecting tank. On the one hand, the pumped mud and water can be used to disturb the original mud and water in the first mud and water collecting tank to reduce the sinking of small-sized sand and gravel in the first mud and water collecting tank. On the other hand, the newly pumped mud and water can be used to replenish the water level of the first mud and water collecting tank to maintain the water level in the first mud and water collecting tank at a higher state, thereby facilitating the first slurry pump to better pump out the mud and water in the first mud and water collecting tank.

[0025] 3. While the excess mud and water in the first mud and water collecting tank flows into the second mud and water collecting tank through the first overflow pipe, the rotary drive component drives the connecting shaft to drive the spiral blade to rotate. On the one hand, it is beneficial to accelerate the mud and water in the first mud and water collecting tank to enter the second mud and water collecting tank. On the other hand, the rotating connecting shaft is used in conjunction with the spiral blade to immediately clear the inner wall of the first overflow pipe to limit the mud and sand from clogging in the first overflow pipe, causing the first overflow pipe to be blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the dewatering screen used to illustrate the embodiment of the present application.

[0027] Figure 2 It is a schematic diagram used to illustrate the positional relationship between the base, the screen box and the vibration motor in an embodiment of the present application.

[0028] Figure 3 It is a schematic diagram of the internal structure of the screen box used to illustrate the embodiment of the present application.

[0029] Figure 4 It is a structural schematic diagram used to illustrate the first mud and water collecting tank and the second mud and water collecting tank in an embodiment of the present application.

[0030] Figure 5 It is a structural schematic diagram used to illustrate the water distribution component in an embodiment of the present application.

[0031] Figure 6 yes Figure 4 Enlarged schematic diagram of part A in the middle.

[0032] Description of reference numerals: 1. Base; 10. Rubber spring; 12. Cyclone; 121. Junction box; 122. Drain pipe; 2. Screen box; 20. Support plate; 21. Primary screen; 211. First baffle plate; 212. First air knife; 22. Secondary screen; 221. Second baffle plate; 222. Second air knife; 3. Vibration motor; 4. First mud and water collecting tank; 40. First overflow pipe; 41. First slurry pump; 411. First water inlet pipe; 412. First water outlet pipe; 42. Water distribution assembly; 421. Water distribution main pipe; 422. Water distribution branch pipe; 423. Water permeable hole; 5. Second mud and water collecting tank; 50. Second overflow pipe; 51. Second slurry pump; 511. Second water inlet pipe; 512. Second water outlet pipe; 513. Flushing pipe; 6. Connecting shaft; 61. Spiral blade; 62. Connecting support; 63. Rotary drive member. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-6 This application is described in further detail.

[0034] The present application embodiment discloses a dewatering screen for sand and mud separation, referring to Figure 1 and Figure 2 , including a base 1, a screen box 2 and a vibration motor 3; the bottom of the screen box 2 is supported on the top of the base 1 by a plurality of rubber springs 10, and the vibration motor 3 is installed on the screen box 2 through a bracket; a primary screen 21 and a secondary screen 22 are supported in the screen box 2, the secondary screen 22 is located above the primary screen 21 and the mesh of the secondary screen 22 is smaller than the mesh of the primary screen 21; the feeding ends of the primary screen 21 and the secondary screen 22 are staggered with each other. A first mud and water collecting trough 4 is installed on the base 1, and the first mud and water collecting trough 4 is located at the bottom of the screen box 2 and is arranged opposite to the primary screen 21; two cyclones 12 are also supported on the base 1, and the two cyclones 12 are located above the secondary screen 22 and the bottom flow ports of the cyclones 12 are both arranged toward the feed end of the secondary screen 22; a first slurry pump 41 is arranged on one side of the first mud and water collecting trough 4, and the water inlet end of the first slurry pump 41 is connected to the bottom of the first mud and water collecting trough 4 through a first water inlet pipe 411; the water outlet end of the first slurry pump 41 is connected to the tangential feed ports of the two cyclones 12 through a first water outlet pipe 412.

[0035] After the machine-made sand to be dehydrated enters the primary screen 21, the screen box 2 is driven to vibrate by the vibration motor 3, so that the machine-made sand on the primary screen 21 moves toward the discharge end of the primary screen 21. During the movement of the machine-made sand on the primary screen 21, the mud and water carried by the machine-made sand falls into the first mud and water collecting tank 4 through the mesh holes on the primary screen 21, thereby realizing the mud and sand separation treatment of the machine-made sand. At the same time, the mud and water in the first mud and water collecting tank 4 are pumped into the two cyclones 12 by the first slurry pump 41, and the two cyclones 12 are used to screen and separate the small-sized sand and gravel carried in the mud and water. The separated small-sized sand and gravel are discharged from the bottom flow outlet at the bottom of the cyclone 12 to the secondary screen 22 in the screen box 2, and the secondary screen 22 is used in conjunction with the vibration motor 3 to further dehydrate the small-sized sand and gravel, thereby realizing the effective recovery of the small-sized sand and gravel in the mud and water, reducing the waste of resources, and reducing the difficulty of subsequent mud and water treatment.

[0036] Reference Figure 2 and Figure 3 The screen box 2 includes two support plates 20, which are connected to each other by a plurality of connecting rods. The primary screen 21 and the secondary screen 22 are located between the two support plates 20, and the primary screen 21 and the secondary screen 22 are connected to the two support plates 20 on opposite sides, so that the primary screen 21 and the secondary screen 22 are firmly installed in the screen box 2.

[0037] The first-level screen 21 has a first baffle plate 211 vertically connected to the feeding end thereof; the second-level screen 22 has a second baffle plate 221 vertically connected to the feeding end thereof; the arrangement of the first baffle plate 211 and the second baffle plate 221 is conducive to limiting the subsequent materials falling onto the first-level screen 21 and the second-level screen 22 from falling from the feeding end of the screen structure, so that the materials on the first-level screen 21 and the second-level screen 22 can be better moved toward the discharging end of the corresponding screen structure under the action of the vibration motor 3.

[0038] The first and second air knives 212 and 222 are respectively supported at the bottom of the feed ends of the primary screen 21 and the secondary screen 22. The first and second air knives 212 and 222 are both connected to the support plate 20 of the screen box 2 through a bracket and are both connected to the air source. The air outlet of the first air knife 212 is spaced apart from the primary screen 21 and is arranged toward the primary screen 21, and the air outlet of the second air knife 222 is spaced apart from the secondary screen 22 and is arranged toward the secondary screen 22. Through the above arrangement, during the subsequent operation of the dewatering screen, compressed air can be continuously blown toward the primary screen 21 and the secondary screen 22 through the first air knife 212 and the second air knife 222 respectively, so as to reduce the adhesion between the sand and gravel and the primary screen 21 and the secondary screen 22, and reduce the blockage at the feed end of the primary screen 21 and the secondary screen 22. At the same time, the compressed air blown by the first air knife 212 and the second air knife 222 can be used to blow out the particulate debris blocked on the primary screen 21 and the secondary screen 22, so as to clear the meshes of the primary screen 21 and the secondary screen 22, which is conducive to the mud and water carried by the subsequent sand and gravel to better flow into the first mud and water collection tank 4 through the meshes of the primary screen 21 and the secondary screen 22.

[0039] Reference Figure 1 and Figure 2 A junction box 121 is also arranged above the secondary screen 22; the junction box 121 is installed and connected to the base 1 through a mounting frame. The overflow ports at the top of the two cyclones 12 are connected to the junction box 121 through pipelines, and a drain pipe 122 is connected to the bottom of the junction box 121. A second muddy water collection tank 5 is also arranged on one side of the base 1, and the end of the drain pipe 122 away from the junction box 121 extends into the second muddy water collection tank 5; the muddy water generated by the subsequent cyclone 12 separating small-sized sand and gravel can be discharged into the junction box 121 through the overflow port at the top of the cyclone 12, and then discharged into the second muddy water collection tank 5 through the drain pipe 122 on the junction box 121, so as to realize the centralized collection of the muddy water generated by the cyclone 12.

[0040] Reference Figure 4 and Figure 5 A water distribution assembly 42 is provided at the bottom of the inner cavity of the first mud and water collecting tank 4. The water distribution assembly 42 includes a water distribution main pipe 421 and a plurality of water distribution branch pipes 422. The water distribution main pipe 421 is located on one side of the first mud and water collecting tank 4, and the two ends of the water distribution main pipe 421 extend to the two ends of the inner cavity of the first mud and water collecting tank 4 respectively. A plurality of water distribution branch pipes 422 are vertically connected to the water distribution main pipe 421, and a plurality of water distribution branch pipes 422 are evenly distributed along the radial direction of the water distribution main pipe. A plurality of water permeable holes 423 are provided on the water distribution branch pipe 422 along its own radial direction. A second slurry pump 51 is also provided between the first mud and water collecting tank 4 and the second mud and water collecting tank 5; the water inlet end of the second slurry pump 51 is connected to the bottom of the second mud and water collecting tank 5 through the second water inlet pipe 511, and the second slurry pump 51 is connected to the water distribution main pipe 421 through the second water outlet pipe 512.

[0041] Through the above arrangement, the second slurry pump 51 can be used to pump the muddy water in the second muddy water collection tank 5 into the water distribution main pipe 421, and finally flow into the first muddy water collection tank 4 through the several water permeable holes 423 on the water distribution branch pipe 422. On the one hand, the muddy water pumped into the first muddy water collection tank 4 can be used to disturb the original muddy water in the first collection tank, which is conducive to reducing the situation where the first slurry pump 41 is difficult to pump the muddy water with small-sized sand and gravel into the cyclone 12 due to the sedimentation of sand and gravel in the first muddy water collection tank 4; on the other hand, the muddy water in the first muddy water collection tank 4 can be supplemented to keep the muddy water in the first muddy water collection tank 4 at a higher water level, so that the first slurry pump 41 can better pump out the muddy water in the first muddy water collection tank 4. The arrangement of the water distribution component 42 is conducive to the muddy water entering the first muddy water collection tank 4 to more evenly disturb the original muddy water in the first muddy water collection tank 4.

[0042] The second water outlet pipe 512 is also connected to a flushing pipe 513, and the flushing pipe 513 is connected to a clean water source through a water pump. A pass-through valve is installed at one end of the flushing pipe 513 near the second water outlet pipe 512. During the period when the second slurry pump 51 is pumping muddy water, the flushing pipe 513 is blocked by the pass-through valve to limit the muddy water flowing through the second water outlet pipe 512 from entering the flushing pipe 513; after the second slurry pump 51 stops pumping muddy water, the pass-through valve can be opened, and the water pump can pump clean water into the second water outlet pipe 512 through the flushing pipe 513, and the pumped clean water is used to flush the various pipes of the water distribution assembly 42, thereby reducing the blockage of the water distribution main pipe 421 and the water distribution main pipe 421 by mud and the like.

[0043] The bottom of the first mud and water collection box is connected to a first overflow pipe 40, and one end of the first overflow pipe 40 away from the first mud and water collection tank 4 is connected to the second mud and water collection tank 5. Excess mud and water in the first mud and water collection tank 4 can be discharged into the second mud and water collection tank 5 through the first overflow pipe 40. The top of the second mud and water collection tank 5 is connected to a second overflow pipe 50, and the second overflow pipe 50 is arranged lower than the first overflow pipe 40. In actual use, the second overflow pipe 50 can be connected to an external temporary mud and water storage point, so that the mud and water in the second mud and water collection tank 5 can be discharged in time through the second overflow pipe 50, thereby reducing the situation where the mud and water overflows the second mud and water collection tank 5. A filter cartridge for filtering sand and gravel is installed at the mouth of the second overflow pipe 50 to limit the small-sized sand and gravel in the second mud and water collection tank 5 from being discharged together with the mud and water.

[0044] Reference Figure 4 and Figure 6A connecting shaft 6 is coaxially supported in the first overflow pipe 40, and both ends of the connecting shaft 6 extend out of the pipe openings at both ends of the first overflow pipe 40. A spiral blade 61 is connected to the outer periphery of the connecting shaft 6, and the outer periphery of the spiral blade 61 is arranged in contact with the inner periphery of the first overflow pipe 40. A connecting support 62 is connected to the inner cavities of both the first mud and water collecting tank 4 and the second mud and water collecting tank 5 corresponding to the connecting shaft 6, and both ends of the connecting shaft 6 are rotatably connected to the two connecting supports 62 through bearings. The connecting support 62 located in the second mud and water collecting tank 5 is also provided with a rotary drive member 63 for driving the connecting shaft 6 to rotate. Specifically, the rotary drive member 63 is a reduction motor, and the output end of the reduction motor is connected to the connecting shaft 6 through a synchronous belt structure, so that the rotary drive member 63 is driven and connected to the connecting shaft 6. The rotary drive member 63 is used to drive the connecting shaft 6 to drive the spiral blade 61 to rotate. On the one hand, it is helpful to accelerate the discharge of mud and water in the first mud and water collecting tank 4 into the second mud and water collecting tank 5 through the first overflow pipe 40. On the other hand, during the rotation of the connecting shaft 6, the spiral blade 61 can continuously clean the inner periphery of the first overflow pipe 40 to limit the accumulation of mud and small-sized impurities in the mud and water in the first overflow pipe 40, causing the first overflow pipe 40 to be blocked, which is beneficial to keep the first overflow pipe 40 unobstructed.

[0045] The implementation principle of the embodiment of the present application is as follows: the machine-made sand to be dehydrated after cleaning by the sand washing machine is discharged into the feed end of the first-level screen 21, and the screen box 2 is driven to vibrate by the vibration motor 3, so that the machine-made sand on the first-level screen 21 moves toward the discharge end of the first-level screen 21 and is discharged through the discharge end of the first-level screen 21; during the movement of the first-level screen 21, the mud and water carried by the machine-made sand falls into the first mud and water collection tank 4 through the mesh holes of the first-level screen 21. The mud and water in the first mud and water collecting tank 4 is pumped into two cyclones 12 by the first slurry pump 41, and the small-sized sand and gravel carried in the mud and water are separated by the cyclone 12. The small-sized sand and gravel separated by the cyclone 12 are discharged through the bottom flow outlet at the bottom of the cyclone 12 to the secondary screen 22 for dehydration treatment, and are discharged through the discharge end of the secondary screen 22. The mud and water separated by the cyclone 12 are discharged into the junction box 121 through the overflow outlet at the top of the cyclone 12, and are discharged into the second mud and water collecting tank 5 through the drainage pipe 122 of the junction box 121.

[0046] The present application uses the first slurry pump 41 in cooperation with the cyclone 12 to further screen out and recover the small-sized sand and gravel accompanying the muddy water generated when the machine-made sand is dehydrated on the dewatering screen, which is beneficial to reducing the waste of resources and effectively reducing the difficulty of subsequent muddy water treatment.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dewatering screen for sand and mud separation, comprising a base (1), a screen box (2) and a vibration motor (3), wherein the screen box (2) is mounted on the base (1) via a plurality of rubber springs (10), and the vibration motor (3) is mounted on the screen box (2); characterized in that: A primary screen (21) and a secondary screen (22) are supported from bottom to top in the screen box (2); the mesh of the secondary screen (22) is smaller than the mesh of the primary screen (21); the feed end of the secondary screen (22) is staggered with the feed end of the primary screen (21); The base (1) is provided with a first muddy water collecting trough (4), and the first muddy water collecting trough (4) is located below the first-level screen (21); a cyclone (12) is also supported on the base (1); the bottom flow outlet of the cyclone (12) is located above the feed end of the second-level screen (22); a first slurry pump (41) is provided on one side of the first muddy water collecting trough (4); the water inlet end of the first slurry pump (41) is connected to the first muddy water collecting trough (4) through a first water inlet pipe (411), and the water outlet end of the first slurry pump (41) is connected to the tangential feed port of the cyclone (12) through a first water outlet pipe (412).

2. A dewatering screen for sand and mud separation according to claim 1, characterized in that: A second muddy water collection tank (5) is also provided on one side of the base (1), and the overflow port at the top of the cyclone (12) is connected to the second muddy water collection tank (5) via a drainage pipe (122).

3. A dewatering screen for sand-mud separation according to claim 2, characterized in that: A second slurry pump (51) is provided on one side of the second mud and water collecting tank (5); the water inlet end of the second slurry pump (51) is connected to the second mud and water collecting tank (5) via a second water inlet pipe (511); and the water outlet end of the second slurry pump (51) is connected to the first mud and water collecting tank (4) via a second water outlet pipe (512).

4. A dewatering screen for sand-mud separation according to claim 3, characterized in that: A water distribution assembly (42) is provided at the bottom of the inner cavity of the first muddy water collection tank (4), and the water distribution assembly (42) includes a water distribution main pipe (421). Two ends of the water distribution main pipe (421) respectively extend to the opposite ends of the inner cavity of the first muddy water collection tank (4). The water distribution main pipe (421) is radially connected to a plurality of water distribution branch pipes (422), and the water distribution branch pipes (422) are provided with a plurality of water permeable holes (423).

5. The dewatering screen for sand-mud separation according to claim 3, characterized in that: The top of the first muddy water collecting tank (4) is connected to a first overflow pipe (40), and one end of the first overflow pipe (40) away from the first muddy water collecting tank (4) is connected to the second muddy water collecting tank (5).

6. A dewatering screen for sand-mud separation according to claim 5, characterized in that: A connecting shaft (6) is coaxially passed through the first overflow pipe (40), and a spiral blade (61) is circumferentially connected to the connecting shaft (6), and the outer periphery of the spiral blade (61) is arranged in contact with the inner periphery of the first overflow pipe (40); the second mud and water collecting tank (5) is provided with a rotary driving member (63), and the rotary driving member (63) is drivingly connected to the connecting shaft (6) for driving the connecting shaft (6) to rotate.

7. A dewatering screen for sand-mud separation according to claim 4, characterized in that: The second water outlet pipe (512) is connected to a flushing pipe (513), an on-off valve is installed at the flushing pipe (513), and the flushing pipe (513) is connected to a clean water source.

8. The dewatering screen for sand-mud separation according to claim 1, characterized in that: A first air knife (212) and a second air knife (222) are respectively supported at the bottom of the feeding ends of the primary screen (21) and the secondary screen (22); an air outlet of the first air knife (212) is arranged toward the primary screen (21), and an air outlet of the second air knife (222) is arranged toward the secondary screen (22).

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