Washing and drying device for dredged sand

Abstract

The invention discloses a dredged sand washing and drying device which comprises a shell and a heating pipe, the shell comprises a water bin and a washing bin, a driving mechanism and a plurality of piston mechanisms are arranged on the water bin, each piston mechanism comprises a piston and a piston cylinder, and a net cylinder and a pendulum bob are arranged in the washing bin. The driving mechanism is used for driving the piston to reciprocate in the piston cylinder and driving the mesh cylinder to rotate, and the piston sprays water and air to the mesh cylinder by reciprocating in the piston cylinder. According to the device, water or air can be compressed through piston movement, pulse water flow or air flow is generated to act on the net barrel, meanwhile, dredging sand can be turned over to be washed, selected and dried in cooperation with rotation of the net barrel and baking of the heating pipe, and therefore the device can integrate two working procedures when the dredging sand is processed into building materials, and the working efficiency is improved. And meanwhile, due to the discontinuity of the pulse water flow, water resources can be saved, and the energy-saving and emission-reducing effects of the machining process are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of building material production, and particularly to a washing and drying device for dredged sand. Background Art

[0002] Dredged sand refers to sandy materials excavated during the dredging process of water areas such as rivers, lakes, and ports. Reasonable utilization of the sand and gravel materials generated during the dredging process can not only reduce the generation of waste and environmental pressure, but also generate economic benefits through resource utilization and turning waste into treasure. At the same time, it also helps to promote the development of circular economy and achieve sustainable utilization of resources.

[0003] Due to long-term water flow scouring and sedimentation, dredged sand has formed unique physical and chemical properties. Therefore, before its resource utilization, appropriate processing is required to meet the usage requirements of different fields. When the final use of dredged sand is building materials, it needs to comply with the standard of "Sand for Construction" (GB / T 14684-2022), with a mud content ≤ 3% (≤ 1% is required for high-strength concrete). Therefore, washing and screening are usually required to strictly control the purity, particle size, and environmental protection indicators of the sand material; and after the sand material is washed and screened, it also needs to be dried in time to control its moisture content ≤ 5% to avoid affecting the water-cement ratio of concrete and thus ensure the strength of the finished product.

[0004] After retrieval, the Chinese invention patent with the publication number CN117583250B discloses a quartz sand washing and screening device, including a lower support, a tabletop, an upper support, a screening component, and a cleaning component. The top of the lower support is connected with the tabletop, the upper support is inclined and fixed on the top of the tabletop, a screening component is installed between the upper parts of the upper support, and a cleaning component is connected to the tabletop; its characteristics are: the screening component includes a partition board, a blanking board, a mesh board, a baffle board, an inclined board, a sliding shaft, and a spring. There are two partition boards, symmetrically installed on the upper part of the upper support, the inclination angle of the partition board is the same as that of the upper support, and a blanking board is inclined and connected between the bottoms of the partition boards. Although this application can wash and screen the sand material, additional drying equipment is still required for sand material drying after washing and screening, so there will be multiple material transfers, which is inconvenient in the process of processing dredged sand into building materials. Summary of the Invention

[0005] Aiming at the above-mentioned prior art, the present invention aims to provide a washing and drying device for dredged sand, and the main technical problem to be solved is how to ensure the convenience in the process of processing dredged sand into building materials.

[0006] To achieve the above object, the technical solution of the embodiment of the present invention is realized as follows:

[0007] A washing and drying device for dredged sand, comprising a housing and heating tubes. The housing includes a water tank and a washing tank. A driving mechanism and several piston mechanisms are provided on the water tank. The piston mechanism includes a piston and a piston cylinder. A mesh cylinder and a pendulum are provided in the washing tank. The driving mechanism is used to drive the piston to reciprocate in the piston cylinder and drive the mesh cylinder to rotate. The piston sprays water and jets air into the mesh cylinder by reciprocating in the piston cylinder. The mesh cylinder flips the dredged sand by rotating itself. The pendulum includes a sleeve, a spring and a hammer head. The pendulum drives the hammer head to strike the mesh cylinder through the elastic force of the spring to cause vibration to shake the dredged sand.

[0008] Further, first through holes are opened at both top ends of the water tank. The water tank is rotatably connected to the same central axis at two second through holes. Several notches are provided on the central axis. Connectors are fixedly connected to both ends of the notch on the central axis. A curved rod is fixedly connected between the two connectors at the same notch. A bearing is fixedly connected to the outside of the curved rod. One end of the bearing is fixedly connected to a swing rod.

[0009] Further, a partition is fixedly connected between the internal water tank and the washing tank of the housing. Several second through holes are opened on the partition. The number of piston cylinders is the same as the number of second through holes. The piston cylinders are fixedly connected to the partition outside the second through holes. A third through hole is opened at the top end of the piston cylinder. A piston rod is slidably connected to the piston cylinder at the third through hole. The piston is fixedly connected to the bottom end of the piston rod.

[0010] Further, the number of piston rods is the same as that of the swing rods and they correspond one by one. The top end of the piston rod is rotatably connected to the swing rod. A nozzle is fixedly connected to the bottom end of the partition at the second through hole. A discharge valve is provided in the second through hole of the partition. An inlet is opened at the bottom end of one side of the piston cylinder. An inlet valve is provided at the inlet of the piston cylinder. Both the inlet valve and the discharge valve are one-way valves. A water injection port and a drain port are respectively opened at one top side and one bottom side of the water tank. Sealing covers are provided at the water injection port and the drain port of the water tank. Several air holes are opened at the top end of the water tank and the outer top end of the washing tank.

[0011] Further, a circular through hole and a circular opening are respectively opened on both sides of the washing tank. A rotating rod and a rotating cylinder are respectively rotatably connected to the washing tank at the circular through hole and the circular opening. The mesh cylinder is fixedly connected between the rotating cylinder and the rotating rod. A discharge port is opened on the outer side of the mesh cylinder. A cover plate is rotatably connected to the mesh cylinder at the discharge port. A magnetic lock is provided between the cover plate and the mesh cylinder. A feed hopper is fixedly connected to the side wall of the washing tank at the rotating cylinder. The bottom end of the feed hopper penetrates through the rotating cylinder and extends into the mesh cylinder.

[0012] Further, one ends of the rotating rod and the central shaft outside the housing are respectively connected with a driving wheel and a driven wheel by keys. The diameter of the driving wheel is smaller than that of the driven wheel. The outside of the driving wheel and the driven wheel is sleeved with the same belt. The water sump is fixedly connected with a housing outside the other end of the central shaft. The driving mechanism includes a motor in the housing, and the output shaft of the motor is fixedly connected with the central shaft.

[0013] Further, the pendulums are located on both sides of the top of the mesh cylinder. The springs are fixedly connected with the inner wall of the washing bin. The hammer heads are fixedly connected to one ends of the springs. The sleeves are sleeved outside the springs. The two ends of the sleeves are respectively fixedly connected with the inner wall of the washing bin and the hammer heads. The material of the sleeves is rubber. A plurality of bumps for hitting the hammer heads are equidistantly and fixedly connected to both sides of the outside of the mesh cylinder. The heating pipes are fixedly connected to the inner wall of the washing bin.

[0014] Further, a collecting groove is arranged at the inner bottom end of the washing bin, and a filter screen is fixedly connected to the middle part of the inner side of the collecting groove.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. In the present application, the piston movement can compress water or air to generate pulsed water flow or air flow acting on the mesh cylinder. At the same time, with the rotation of the mesh cylinder and the baking of the heating pipes, the dredged sand can be turned over and washed and dried respectively. Therefore, the two processes of processing the dredged sand into building materials can be integrated together, making the processing process more convenient. At the same time, the discontinuity of the pulsed water flow can save water resources to ensure the energy conservation and emission reduction effect of the processing process. In addition, the rotation of the mesh cylinder can also knock the pendulum through the bumps, and then the pendulum will hit the mesh cylinder under the influence of gravity and its own elastic force to cause its vibration, so as to vibrate the materials inside it to ensure full contact with the water flow or air flow, and further ensure the washing and drying effects of the dredged sand.

[0017] 2. By arranging the feed hopper on the housing in a state of passing through the rotating cylinder, the present device can facilitate feeding without affecting the rotation of the mesh cylinder. The cover plate can be kept in a normally closed state under the action of the magnetic lock, so as to maintain the smooth and stable progress of the washing and drying process of the dredged sand. After the washing and drying are completed, the magnetic lock can be controlled to release the locking of the cover plate. When the mesh cylinder rotates to the position where the cover plate faces downward, the dredged sand can be discharged. After the materials are completely discharged, when the mesh cylinder rotates to the position where the cover plate faces upward, the magnetic lock can be controlled to lock the cover plate, and then the processing of the next batch of materials can be started to ensure the continuity of the material processing process.

[0018] 3. By arranging a collecting groove below the mesh cylinder, the waste materials obtained from washing the dredged sand can be collected by using the collecting groove and the filter screen inside it, and solid-liquid separation can be realized at the same time, so as to facilitate the subsequent unified planning and treatment of the above waste materials. Description of the Drawings

[0019] Figure 1 It is a perspective view of a washing, selecting and drying device for dredged sand in Embodiment 1 of the present application;

[0020] Figure 2 It is a front sectional view of a washing, selecting and drying device for dredged sand in Embodiment 1 of the present application;

[0021] Figure 3 It is a perspective view of the central axis of a washing, selecting and drying device for dredged sand in Embodiment 1 of the present application;

[0022] Figure 4 It is a perspective view of the pendulum of a washing, selecting and drying device for dredged sand in Embodiment 1 of the present application;

[0023] Figure 5 It is a front sectional view of a washing, selecting and drying device for dredged sand in Embodiment 2 of the present application.

[0024] Explanation of the reference numerals in the drawings:

[0025] Outer shell 1, water tank 101, washing and selecting bin 102, belt 2, driven wheel 3, sealing cover 4, driving wheel 5, partition 6, joint 7, curved rod 8, bearing 9, central axis 10, machine shell 11, motor 12, swing rod 13, piston rod 14, piston 15, piston cylinder 16, spray head 17, pendulum 18, sleeve 1801, spring 1802, hammer head 1803, feed hopper 19, rotating drum 20, rotating rod 2001, mesh drum 21, convex block 22, cover plate 23, heating pipe 24, collection tank 25, filter screen 26. Detailed implementation manners

[0026] The technical solutions of the present invention will be further elaborated in detail below in conjunction with the drawings in the specification and specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0027] Embodiment 1

[0028] Refer to the appendix Figures 1-4, this application provides a washing and drying device for dredged sand, which includes a housing 1 and a heating pipe 24. The housing 1 includes a water tank 101 and a washing tank 102. A driving mechanism and several piston mechanisms are provided on the water tank 101. The piston mechanism includes a piston 15 and a piston cylinder 16. A mesh cylinder 21 and a pendulum 18 are provided in the washing tank 102. The driving mechanism is used to drive the piston 15 to reciprocate in the piston cylinder 16 and drive the mesh cylinder 21 to rotate. The piston 15 sprays water and jets air into the mesh cylinder 21 through its reciprocating movement in the piston cylinder 16 to meet the requirements of washing and drying respectively, that is, the water flow is used for washing, and the air flow is used for drying to accelerate the air flow so that the dredged sand can be fully heated. The mesh cylinder 21 flips the dredged sand by its own rotation. The pendulum 18 includes a sleeve 1801, a spring 1802 and a hammer head 1803. The pendulum 18 drives the hammer head 1803 to strike the mesh cylinder 21 through the elastic force of the spring 1802 to cause vibration to shake the dredged sand.

[0029] Preferably, a partition 6 is fixedly connected between the internal water tank 101 and the washing tank 102 of the housing 1. Several second through holes are opened on the partition 6. The number of piston cylinders 16 is the same as the number of second through holes. The piston cylinders 16 are fixedly connected to the partition 6 outside the second through holes. A third through hole is opened at the top end of the piston cylinder 16. A piston rod 14 is slidably connected to the piston cylinder 16 at the third through hole. The piston 15 is fixedly connected to the bottom end of the piston rod 14.

[0030] Preferably, the number of piston rods 14 is the same as that of swing rods 13 and they correspond one by one. The top end of the piston rod 14 is rotatably connected to the swing rod 13. A spray head 17 is fixedly connected to the bottom end of the partition 6 at the second through hole. A discharge valve is provided in the second through hole of the partition 6. A feed inlet is opened at the bottom end of one side of the piston cylinder 16. A feed valve is provided at the feed inlet of the piston cylinder 16. Both the feed valve and the discharge valve are one-way valves, that is, when the piston 15 rises, water or air in the water tank 101 can be drawn into the piston cylinder 16 from the feed inlet, and when the piston 15 descends, water or air in the piston cylinder 16 can be pushed into the washing tank 102 from the discharge port. A water injection port and a drain port are respectively opened at one side of the top end and one side of the bottom end of the water tank 101. Sealing covers 4 are provided at the water injection port and the drain port of the water tank 101. Several air holes are opened at the top end of the water tank 101 and the outer top end of the washing tank 102. The air holes on the water tank 101 can allow external air to supplement into the water tank 101 when the water or air inside it is consumed to maintain the internal and external air pressure balance. The washing tank 102 can discharge the internal air from the air holes when it is filled with water or air inside.

[0031] Preferably, circular through-holes are respectively formed on both sides of the washing bin 102. A rotating rod 2001 and a rotating cylinder 20 are respectively rotatably connected to the washing bin 102 at the circular through-hole and the circular opening. A mesh cylinder 21 is fixedly connected between the rotating cylinder 20 and the rotating rod 2001. A discharge port is formed on the outer side of the mesh cylinder 21. A cover plate 23 is rotatably connected to the mesh cylinder 21 at the discharge port. A feed hopper 19 is fixedly connected to the side wall of the washing bin 102 at the rotating cylinder 20. The bottom end of the feed hopper 19 penetrates through the rotating cylinder 20 and extends into the mesh cylinder 21.

[0032] When processing dredged sand into building materials, washing water can be injected into the water bin 101, the dredged sand can be put into the mesh cylinder 21 from the feed hopper 19, and then the motor 12 is started. The motor 12 can make the curved rod 8 swing by driving the central shaft 10 to rotate. The curved rod 8 can push and pull the piston rod 14 through the swing rod 13, thereby driving the piston 15 to perform a piston motion in the piston cylinder 16. That is, when the piston 15 rises, the cleaning liquid in the water bin 101 can be pumped into the piston cylinder 16, and when the piston 15 descends, the water body can be squeezed to spray out from the nozzle 17, so as to generate a pulsed water flow acting on the mesh cylinder 21.

[0033] Preferably, first through-holes are respectively formed at the top ends of both sides of the water bin 101. The water bin 101 is rotatably connected to the same central shaft 10 at two second through-holes. A plurality of notches are formed on the central shaft 10. Connectors 7 are fixedly connected to both ends of the central shaft 10 at the notches. A curved rod 8 is fixedly connected between the two connectors 7 at the same notch. A bearing 9 is fixedly connected to the outside of the curved rod 8. One end of the bearing 9 is fixedly connected to a swing rod 13.

[0034] Preferably, one ends of the rotating rod 2001 and the central shaft 10 outside the housing 1 are respectively connected to a driving wheel 5 and a driven wheel 3 by key connections. The diameter of the driving wheel 5 is smaller than that of the driven wheel 3. The driving wheel 5 and the driven wheel 3 are sleeved with the same belt 2. A machine housing 11 is fixedly connected to the outside of the other end of the central shaft 10 of the water bin 101. The driving mechanism includes a motor 12 in the machine housing 11. The output shaft of the motor 12 is fixedly connected to the central shaft 10. The transmission process of the driving wheel 5 and the driven wheel 3 by the belt 2 has a speed reduction effect. Therefore, while maintaining the frequency of the pulsed water flow and the air flow, it can avoid the rotating speed of the mesh cylinder 21 from being too fast and generating too large a centrifugal force, resulting in the influence on the effect of turning the dredged sand.

[0035] Preferably, the pendulum 18 is located on both sides of the top of the mesh cylinder 21. The spring 1802 is fixedly connected to the inner wall of the washing bin 102. The hammer head 1803 is fixedly connected to one end of the spring 1802. The sleeve 1801 is sleeved outside the spring 1802. Both ends of the sleeve 1801 are fixedly connected to the inner wall of the washing bin 102 and the hammer head 1803 respectively. The material of the sleeve 1801 is rubber. A number of bumps 22 for hitting the hammer head 1803 are equally spaced and fixedly connected to both sides of the outside of the mesh cylinder 21. After the bumps 22 hit the pendulum 18, the pendulum 18 will swing irregularly. However, affected by its own gravity, it will eventually return to the hanging state. During this process, the pendulum 18 can hit the mesh cylinder 21 irregularly, causing it to vibrate irregularly, and making the oscillation of the dredged sand more chaotic.

[0036] At the same time, the rotation of the central shaft 10 can also drive the driving wheel 5 to rotate. The driving wheel 5 drives the driven wheel 3 to rotate through the belt 2. The driven wheel 3 can drive the mesh cylinder 21 to rotate through the rotating rod 2001. The rotation of the mesh cylinder 21 can not only cooperate with the water flow sprayed from the nozzle 17 to wash the dredged sand by turning the material, but also the mesh cylinder 21 can hit the pendulum 18 through the bumps 22, causing it to undergo elastic deformation. Then, due to the elastic force of the spring 1802 and the gravity of the hammer head 1803, the pendulum 18 will hit the mesh cylinder 21 to cause its vibration. Therefore, during the rotation of the mesh cylinder 21, it can also oscillate the material through its own vibration, making the contact between the material and the water flow more sufficient, and thus ensuring the washing effect.

[0037] Preferably, the heating pipe 24 is fixedly connected to the inner wall of the washing bin 102.

[0038] After the dredged sand is fully washed, the washing water in the water storage bin 101 can be drained first, and then the heating pipe 24 is turned on. At this time, the movement of the piston 15 in the piston cylinder 16 will squeeze the air, enabling the nozzle 17 to spray pulsed air flow onto the mesh cylinder 21. Therefore, it can accelerate the air flow in the washing bin 102, enabling the high temperature generated by the heating pipe 24 to quickly and fully contact the dredged sand to achieve the effect of drying after washing.

[0039] Preferably, a magnetic lock is provided between the cover plate 23 and the mesh cylinder 21.

[0040] After the dredged sand is fully dried, the magnetic lock of the mesh cylinder 21 can be controlled to release the lock on the cover plate 23. Then, when the mesh cylinder 21 rotates to make the cover plate 23 face downward, the cover plate 23 will open due to its own gravity and the gravity of the material, enabling the material to be quickly discharged. After the material is discharged, when the mesh cylinder 21 rotates to make the cover plate 23 face upward, it is only necessary to control the magnetic lock to lock the cover plate 23 again to continue the washing and drying work of the next batch of materials.

[0041] Embodiment 2

[0042] Referring to the attached Figure 5 , this application provides a washing and drying device for dredged sand. Compared with Embodiment 1, in order to facilitate the collection of the waste materials obtained from washing and selection, a collection tank 25 is provided at the inner bottom end of the washing tank 102, and a filter screen 26 is fixedly connected to the middle part of the inner side of the collection tank 25.

[0043] The collection tank 25 can collect the waste materials and waste liquids generated from washing and dredging sand below the mesh cylinder 21, and can separate the solid and liquid of the two through the filter screen 26, so as to facilitate their collection and subsequent unified treatment.

[0044] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should be covered by the protection scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A washing, selecting and drying device for dredged sand, comprising a housing (1) and a heating tube (24), characterized in that, The housing (1) includes a water tank (101) and a washing and screening tank (102). A driving mechanism and a number of piston mechanisms are provided on the water tank (101). The piston mechanism includes a piston (15) and a piston cylinder (16). A mesh cylinder (21) and a pendulum (18) are provided in the washing and screening tank (102). The driving mechanism is used to drive the piston (15) to reciprocate in the piston cylinder (16) and to drive the mesh cylinder (21) to rotate. The piston (15) sprays water and jets air towards the mesh cylinder (21) by reciprocating in the piston cylinder (16). The mesh cylinder (21) flips the dredged sand by its own rotation. The pendulum (18) includes a sleeve (1801), a spring (1802) and a hammer head (1803). The pendulum (18) drives the hammer head (1803) to strike the mesh cylinder (21) by the elastic force of the spring (1802) to cause vibration to shake the dredged sand.

2. The washing, selecting and drying device for dredged sand according to claim 1, characterized in that, First through holes are formed at both top ends of the water tank (101). The water tank (101) is rotatably connected to the same central shaft (10) at two second through holes. A number of notches are formed on the central shaft (10). Connectors (7) are fixedly connected to both ends of the central shaft (10) at the notches. A curved rod (8) is fixedly connected between the two connectors (7) at the same notch. A bearing (9) is fixedly connected to the outside of the curved rod (8). One end of the bearing (9) is fixedly connected to a swing rod (13).

3. The washing and drying device for dredged sand according to claim 2, characterized in that, A partition (6) is fixedly connected between the internal water tank (101) and the washing and screening tank (102) of the housing (1). A number of second through holes are formed in the partition (6). The number of piston cylinders (16) is the same as the number of second through holes. The piston cylinders (16) are fixedly connected to the partition (6) outside the second through holes. A third through hole is formed at the top end of the piston cylinder (16). A piston rod (14) is slidably connected to the piston cylinder (16) at the third through hole. The piston (15) is fixedly connected to the bottom end of the piston rod (14).

4. The washing, selecting and drying device for dredged sand according to claim 3, characterized in that, The number of the piston rods (14) is the same as that of the swing rods (13) and they correspond one by one. The top end of the piston rod (14) is rotatably connected to the swing rod (13). A spray head (17) is fixedly connected to the bottom end of the partition (6) at the second through hole. A discharge valve is provided in the second through hole of the partition (6). A feed inlet is formed at the bottom end of one side of the piston cylinder (16). A feed valve is provided at the feed inlet of the piston cylinder (16). Both the feed valve and the discharge valve are one-way valves. A water injection port and a drain port are respectively formed at one top side and one bottom side of the top end of the water tank (101). Sealing caps (4) are provided at the water injection port and the drain port of the water tank (101). A number of air holes are formed at the top end of the water tank (101) and the outer top end of the washing and screening tank (102).

5. The washing, selecting and drying device for dredged sand according to claim 4, characterized in that, Both sides of the washing bin (102) are respectively provided with a circular through-hole and a circular opening. A rotating rod (2001) and a rotating cylinder (20) are respectively rotatably connected to the washing bin (102) at the circular through-hole and the circular opening. A mesh cylinder (21) is fixedly connected between the rotating cylinder (20) and the rotating rod (2001). A discharge port is arranged on the outer side of the mesh cylinder (21). A cover plate (23) is rotatably connected to the mesh cylinder (21) at the discharge port. A magnetic lock is arranged between the cover plate (23) and the mesh cylinder (21). A feed hopper (19) is fixedly connected to the side wall of the washing bin (102) at the rotating cylinder (20). The bottom end of the feed hopper (19) penetrates through the rotating cylinder (20) and extends into the mesh cylinder (21).

6. The washing and drying device for dredged sand according to claim 5, characterized in that, One ends of the rotating rod (2001) and the central shaft (10) outside the housing (1) are respectively connected with a driving wheel (5) and a driven wheel (3) by keys. The diameter of the driving wheel (5) is smaller than that of the driven wheel (3). The driving wheel (5) and the driven wheel (3) are sleeved with the same belt (2). A housing (11) is fixedly connected to the outside of the other end of the central shaft (10) of the water bin (101). The driving mechanism includes a motor (12) in the housing (11). The output shaft of the motor (12) is fixedly connected with the central shaft (10).

7. The washing and drying device for dredged sand according to claim 6, characterized in that, The pendulums (18) are located on both sides of the top end of the mesh cylinder (21). Springs (1802) are fixedly connected to the inner wall of the washing bin (102). Hammer heads (1803) are fixedly connected to one ends of the springs (1802). Sleeves (1801) are sleeved on the outside of the springs (1802). Two ends of the sleeves (1801) are respectively fixedly connected to the inner wall of the washing bin (102) and the hammer heads (1803). The material of the sleeves (1801) is rubber. A plurality of bumps (22) for hitting the hammer heads (1803) are equidistantly and fixedly connected to both sides of the outside of the mesh cylinder (21). Heating pipes (24) are fixedly connected to the inner wall of the washing bin (102).

8. The washing, selecting and drying device for dredged sand according to claim 1, wherein, A collection tank (25) is arranged at the inner bottom end of the washing bin (102). A filter screen (26) is fixedly connected to the middle part of the inner side of the collection tank (25).

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