Efficient sand and stone dewatering and air drying device

Abstract

This utility model relates to a high-efficiency sand and gravel dewatering and drying device, including a sand and gravel dewatering device, a dewatering and drying device, and a conveying device for conveying the thick slurry separated by the sand and gravel dewatering device into the dewatering and drying device; the sand and gravel dewatering device includes a hydrocyclone and a first slurry pump for pumping slurry into the hydrocyclone; the dewatering and drying device includes a frame, a dewatering device, and a drying device; the dewatering device includes a shell, a drum, and a rotary drive mechanism for driving the drum to rotate; the shell and the drum are coaxially arranged; the outer wall of the drum is rotatably connected to the inner wall of the shell, and the inner wall of the drum is provided with multiple sets of bending blades; the drying device includes an axial flow fan located at the end of the shell; the outlet of the axial flow fan faces the inner cavity of the drum. Through the above improvements, the high-efficiency sand and gravel dewatering and drying device of this utility model can significantly improve the resource utilization efficiency of waste sludge.

Description

Technical Field

[0001] This utility model relates to the field of sand and gravel processing, specifically to a high-efficiency sand and gravel dehydration and drying device. Background Technology

[0002] With the deepening of rural construction and environmental governance, solid waste such as construction slag and river dredging sludge has surged. Its complex composition (containing sand, gravel, wood, plastics, etc.) will cause secondary pollution if not treated efficiently. While existing waste slag and sludge separation equipment can initially classify sand and gravel, it suffers from three major drawbacks: First, the separation process is lengthy, often relying on a series of vibrating screens and wheel sand washers, requiring a large footprint; second, the moisture content of the separated fine sand is as high as 20-30%, necessitating additional drying or heat treatment, which prolongs the processing cycle and increases energy consumption; third, the resource recovery rate is low, as the moist fine sand is difficult to use directly in building materials or backfill. Especially in the context of promoting comprehensive rural revitalization, there is an urgent need for a closed-loop solution that can achieve fine separation, deep dehydration, and immediate use. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a high-efficiency sand and gravel dewatering and drying device, which can significantly improve the resource utilization efficiency of waste residue and sludge.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is:

[0005] A high-efficiency sand and gravel dewatering and drying device includes a sand and gravel dewatering unit, a dewatering and drying unit, and a conveying device for conveying the thick slurry separated from the sand and gravel dewatering unit into the dewatering and drying unit, wherein...

[0006] The sand and gravel dewatering device includes a hydrocyclone and a first mud pump for pumping mud into the hydrocyclone. The input end of the first mud pump is connected to a coarse particle collection tank, and the output end is connected to the input end of the hydrocyclone through a water and sand conveying pipe. The output end of the hydrocyclone is connected to a fine particle collection tank.

[0007] The dehydration and drying device includes a frame and a dehydration device and a drying device mounted on the frame. The dehydration device includes a housing, a roller disposed within the housing, and a rotary drive mechanism for driving the roller to rotate. The housing is mounted on the frame and is coaxially arranged with the roller. The outer wall of the roller is rotatably connected to the inner wall of the housing. Multiple sets of bending baffles are disposed on the inner wall of the roller, and the multiple sets of bending baffles are arranged along the circumference and axis of the roller. The drying device includes an axial flow fan disposed at the end of the housing. The outlet of the axial flow fan faces the inner cavity of the roller.

[0008] Preferably, the front end of the housing is provided with a kit, which is mounted on the housing.

[0009] Preferably, the conveying device includes a second mud pump; the input end of the second mud pump is connected to the fine particle collection tank, the output end is connected to one end of the mud conveying pipe, and the other end of the mud conveying pipe is connected to one end of the fixed mud pipe; the fixed mud pipe is installed on the kit, and the other end of the fixed mud pipe is connected to the inner cavity of the roller.

[0010] Preferably, the roller is provided with a rotary vent joint at a position corresponding to the fixed mud pipe. The rotary vent joint is coaxially arranged with the roller and rotatably connected to the roller. The fixed mud pipe is installed at the center position of the rotary vent joint, and a sealing element is provided between the outer wall of the fixed mud pipe and the rotary vent joint.

[0011] Preferably, the roller includes a dehydration and drying section at the front end and a filtration section at the end; wherein the bending blade is disposed in the dehydration and drying section; a screen is disposed on the filtration section; and a discharge port is disposed at the bottom of the outer shell at a position corresponding to the screen, and a discharge trough is disposed at the discharge port.

[0012] Preferably, the rotary drive mechanism includes a rotary motor mounted on the frame and a drive gear mounted on the rotary motor; a driven gear is provided on the outer wall of the drum, and a clearance groove is provided on the outer casing at a position corresponding to the driven gear; the drive gear meshes with the driven gear.

[0013] Preferably, the dehydration and drying device further includes a heating device for heating the drum. The heating device includes a hot air inlet on the kit, an air inlet on the rotary vent joint, and a steam heat exchange chamber between the outer and inner walls of the drum. The hot air inlet is connected to a hot air delivery pipe. The gaps in the kit form a hot air delivery channel connecting the hot air inlet and the air inlet. The air inlet is connected to the steam heat exchange chamber. The steam heat exchange chamber is located in the dehydration and drying section of the drum.

[0014] Preferably, there are multiple sets of air inlets, which are evenly arranged along the circumference of the rotary vent joint; there are multiple sets of steam heat exchange chambers, and each set of steam heat exchange chambers is connected to each set of air inlets.

[0015] Preferably, the device further includes an angle adjustment device for adjusting the angle of the dehydration and drying apparatus. The angle adjustment device includes a base frame, a front connecting rod, a rear connecting rod, and a hydraulic cylinder mounted on the base frame. The front connecting rod and the rear connecting rod are in two sets, with the upper end of each set of front connecting rods and the lower end of each set of rear connecting rods hinged to the frame and the lower end of each set of rear connecting rods hinged to the base frame. The cylinder body of the hydraulic cylinder is hinged to the base frame, and the hydraulic rod of the hydraulic cylinder is hinged to the frame.

[0016] Preferably, the outer shell is provided with a water collection tank at the end of the dehydration and drying section, and the end of the steam heat exchange cavity is connected to the water collection tank.

[0017] Compared with the prior art, this utility model has the following advantages:

[0018] 1. The high-efficiency sand and gravel dewatering and drying device of this utility model innovatively integrates a hydrocyclone and a blower drum (i.e., axial flow fan + drum + drying device). The hydrocyclone performs pre-dewatering, and then the pre-dewatered material (i.e., thick slurry) is subjected to secondary dewatering (i.e., countercurrent hot air drying), thereby completely solving the bottleneck of fine sand utilization and significantly improving the resource utilization efficiency of waste residue and mud.

[0019] 2. The high-efficiency sand and gravel dewatering and drying device of this utility model combines centrifugal pre-dewatering of the hydrocyclone with counter-current cold air drying of the blower drum for two-stage synergistic dewatering, which is highly efficient and has a good water removal and drying effect. Attached Figure Description

[0020] Figures 1-3 These are three structural schematic diagrams of the high-efficiency sand and gravel dehydration and drying device of this utility model from three different perspectives.

[0021] Figure 4 This is a schematic diagram of the rotary drive mechanism.

[0022] Figure 5 This is a 3D view of the roller.

[0023] Figure 6 This is a cross-sectional view of the roller.

[0024] Figure 7 This is a schematic diagram of the air inlet and steam heat exchange chamber (the arrows indicate the direction of hot air flow).

[0025] Figure 8 This is a schematic diagram of the water collection tank. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.

[0027] See Figures 1-8The high-efficiency sand and gravel dewatering and drying device of this utility model includes a sand and gravel dewatering device, a dewatering and drying device, and a conveying device for conveying the thick slurry separated by the sand and gravel dewatering device to the dewatering and drying device, wherein...

[0028] The sand and gravel dewatering device includes a hydrocyclone 29 and a first mud pump 2 for pumping mud into the hydrocyclone 29. The input end of the first mud pump 2 is connected to the coarse particle collection tank 1, and the output end is connected to the input end of the hydrocyclone 29 through the water and sand conveying pipe 3. The output end of the hydrocyclone 29 is connected to the fine particle collection tank 4.

[0029] In this embodiment, the hydrocyclone 29 is used for centrifugal pre-dehydration. The hydrocyclone 29 adopts a cone angle design and has a reasonable structural design. The wet sand is pre-dehydrated under the action of high-speed rotating centrifugal force, and the dehydration is highly efficient.

[0030] The water-sand mixture to be treated in the coarse particle collection tank 1 is pumped into the hydrocyclone 29 through the water-sand conveying pipe 3 by the first mud pump 2 for primary solid-liquid separation. The separated wastewater is discharged through the outlet pipe 20, and the dewatered slurry falls into the fine particle collection tank 4 below it.

[0031] The dehydration and drying device includes a frame 10 and a dehydration device and a drying device mounted on the frame 10. The dehydration device includes a housing 8, a roller 21 disposed within the housing 8, and a rotary drive mechanism for driving the roller 21 to rotate. The housing 8 is mounted on the frame 10 and is coaxially arranged with the roller 21. The outer wall of the roller 21 is rotatably connected to the inner wall of the housing 8. The inner wall of the roller 21 is provided with multiple sets of bending baffles 28, which are arranged along the circumference and axis of the roller 21. The drying device includes an axial flow fan 9 disposed at the end of the housing 8. The outlet of the axial flow fan 9 faces the inner cavity of the roller 21.

[0032] The front end of the outer shell 8 is provided with a kit 7, which is installed on the outer shell 8; the conveying device includes a second mud pump 5; the input end of the second mud pump 5 is connected to the fine particle collection tank 4, and the output end is connected to one end of the mud conveying pipe 6, while the other end of the mud conveying pipe 6 is connected to one end of the fixed mud pipe 24; the fixed mud pipe 24 is installed on the kit 7, and the other end of the fixed mud pipe 24 is connected to the inner cavity of the drum 21; the thick slurry in the fine particle collection tank 4 is pumped into the continuously rotating drum 21 by the second mud pump 5; the axial flow fan 9 blows air counter-currently from the bottom of the drum 21, and during the continuous rotation of the drum 21, the bending blades 28 inside the drum 21 continuously spray the thick slurry, so that the counter-current air and the thick slurry can fully exchange heat, thereby causing the water in the thick slurry to evaporate quickly, and thus obtaining air-dried fine sand. This dynamic air-drying method can also effectively prevent the fine sand from clumping.

[0033] See Figures 1-8 The roller 21 is provided with a rotary vent joint 23 at a position corresponding to the fixed mud pipe 24. The rotary vent joint 23 is coaxially arranged with the roller 21 and rotatably connected to the roller 21. The fixed mud pipe 24 is installed at the center position of the rotary vent joint 23. A sealing element 25 is provided between the outer wall of the fixed mud pipe 24 and the rotary vent joint 23 to achieve a seal between the fixed mud pipe 24 and the rotary vent joint 23. The rotary vent joint 23 can be implemented with reference to a slip ring structure, so as to prevent the fixed mud pipe 24 from rotating during the rotation of the roller 21.

[0034] See Figures 1-8 The roller 21 includes a dehydration and drying section at the front end and a filtration section at the end. The bending blade 28 is located in the dehydration and drying section. A screen 22 is provided on the filtration section. A discharge port 16 is provided at the bottom of the outer shell 8 at a position corresponding to the screen 22, and a discharge trough is provided at the discharge port 16. The dried fine sand will enter the screen 22, and after passing through the screen holes in the screen 22, it will continue to pass through the discharge port 16 in the outer shell 8 and fall into the discharge trough, and be guided to the corresponding collection device through the discharge trough.

[0035] In this embodiment, the roller 21 is installed at an angle, and the wet sand is repeatedly scattered from top to bottom by the bending blades 28 inside the roller 21. The roller 21 rotates and tumbles to scatter the sand at a low speed (5-8 rpm). An axial flow fan 9 is located at the tail of the roller 21, which delivers air in the opposite direction to dry the wet sand. This process can be completed in only 4-6 minutes. This reduces energy consumption to as low as 0.8 kWh / ton of sand (hot air drying requires ≥3.5 kWh / ton of sand), and reduces operating costs by 70%.

[0036] See Figures 1-8 The rotary drive mechanism includes a rotary motor 17 mounted on the frame 10 and a drive gear 18 mounted on the rotary motor 17; a driven gear 19 is mounted on the outer wall of the drum 21, and a clearance groove is provided on the outer shell 8 at the corresponding position of the driven gear 19; the drive gear 18 meshes with the driven gear 19; the rotary motor 17 drives the drive gear 18 to rotate, thereby driving the driven gear 19 and the drive gear 18 connected to the driven gear 19 to rotate, thus driving the drum 21 to rotate. During this process, the axial flow fan 9 sends air counter-currently from the bottom of the drum 21, and the bending blades 28 inside the drum 21 spray fine sand. The counter-current air and the fine sand undergo sufficient heat exchange (the gas-solid contact area is increased by 300%), reducing the moisture content from 15-20% to 7-10% within ≤10 minutes, and controlling the energy consumption to below 0.8kWh / ton of sand, thus breaking through the high energy consumption limitation of traditional hot air drying.

[0037] See Figures 1-8 The dehydration and drying device further includes a heating device for heating the drum 21. The heating device includes a hot air inlet 26 on the assembly 7, an air inlet on the rotary vent joint 23, and a steam heat exchange chamber 27 between the outer and inner walls of the drum 21. The hot air inlet 26 is connected to a hot air conveying pipe. The gaps within the assembly 7 form a hot air conveying channel connecting the hot air inlet 26 and the air inlet. The air inlet is connected to the steam heat exchange chamber 27. The steam heat exchange chamber 27 is located in the dehydration and drying section of the drum 21. High-pressure steam flows sequentially through the hot air inlet 26 on the assembly 7 and the air inlet on the rotary vent joint 23 before entering the steam heat exchange chamber 27 of the drum 21, thereby heating the drum body. The air blown in by the axial flow fan 9 flows over the heated surface of the drum body to form hot air, which penetrates and dries the material inside the drum 21 from bottom to top, thus improving drying efficiency.

[0038] In this embodiment, there are multiple sets of air inlets, which are evenly arranged along the circumference of the rotary vent joint 23; there are multiple sets of steam heat exchange channels 27, and each set of steam heat exchange channels 27 is connected to each set of air inlets; through the above arrangement, the heating efficiency of the cylinder of the drum 21 can be improved.

[0039] See Figures 1-8 The outer shell 8 is provided with a water collection tank 15 at the end of the dehydration and drying section. The end of the steam heat exchange channel 27 is connected to the water collection tank 15. During the heat exchange process, the condensate generated by the steam heat exchange channel 27 is collected and discharged uniformly through the water collection tank 15.

[0040] See Figures 1-8 The high-efficiency sand and gravel dewatering and drying device of this utility model also includes an angle adjustment device for adjusting the angle of the dewatering and drying device. The angle adjustment device includes a base frame 11, a front connecting rod 13 and a rear connecting rod 14 mounted on the base frame 11, and a hydraulic cylinder 12. The front connecting rod 13 and the rear connecting rod 14 are in two sets, with the upper end of each set hinged to the frame 10 and the lower end hinged to the base frame 11. The cylinder body of the hydraulic cylinder 12 is hinged to the base frame 11, and the hydraulic rod of the hydraulic cylinder 12 is hinged to the frame 10. The hydraulic cylinder 12 drives the hydraulic rod to move, thereby causing the dewatering and drying device to swing. During this process, the angle of the dewatering and drying device (i.e., the angle of the roller 21) can be adjusted by controlling the stroke of the hydraulic rod.

[0041] See Figures 1-8 The working principle of this utility model's high-efficiency sand and gravel dewatering and drying device is as follows:

[0042] During operation, the water-sand mixture to be treated is first stored in the coarse particle collection tank 1. It is then pumped by the first mud pump 2 through the water-sand conveying pipe 3 into the hydrocyclone 29 for primary solid-liquid separation. The separated wastewater is discharged through the outlet pipe, while the dewatered slurry falls into the fine particle collection tank 4 and is then pumped by the second mud pump 5 through the mud conveying pipe 6 and the fixed mud pipe 24 into the continuously rotating drum 21. Simultaneously, high-pressure steam flows sequentially through the hot air inlet 26 and the air inlet of the rotary vent joint 23 on the kit 7 before entering the steam heat exchange chamber 27 in the drum 21 to heat the drum body. The axial flow fan 9... The blown-in air flows over the heated surface of the cylinder to form hot air, which penetrates and dries the material inside the drum 21 from bottom to top. The material is continuously lifted and sprinkled by the bending welded plates set on the inner wall of the drum 21, forming a uniform material curtain, which allows it to fully contact the hot air, thereby achieving efficient heat and mass exchange. Finally, the dried fine sand moves from the high end to the low end of the drum 21 under the combined action of the inclination angle and the rotation of the drum 21, and enters the screen 22. After passing through the screen holes in the screen 22, it continues to pass through the discharge port 16 in the outer shell 8 and falls into the discharge trough, and is guided to the corresponding collection device through the discharge trough.

[0043] During the above process, the condensate generated in the steam heat exchange chamber 27 is collected by the water collection tank 15 located below the rear of the outer shell 8 and discharged uniformly.

[0044] The above are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above content. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A high efficiency sand and stone dewatering and air drying device, characterized in that, It includes a sand and gravel dewatering device, a dewatering and drying device, and a conveying device for conveying the thick slurry separated from the sand and gravel dewatering device to the dewatering and drying device, wherein, The sand and gravel dewatering device includes a hydrocyclone and a first mud pump for pumping mud into the hydrocyclone. The input end of the first mud pump is connected to a coarse particle collection tank, and the output end is connected to the input end of the hydrocyclone through a water and sand conveying pipe. The output end of the hydrocyclone is connected to a fine particle collection tank. The dehydration and drying device includes a frame and a dehydration device and a drying device mounted on the frame. The dehydration device includes a housing, a roller disposed within the housing, and a rotary drive mechanism for driving the roller to rotate. The housing is mounted on the frame and is coaxially arranged with the roller. The outer wall of the roller is rotatably connected to the inner wall of the housing. Multiple sets of bending baffles are disposed on the inner wall of the roller, and the multiple sets of bending baffles are arranged along the circumference and axis of the roller. The drying device includes an axial flow fan disposed at the end of the housing. The outlet of the axial flow fan faces the inner cavity of the roller.

2. The efficient sand and stone dewatering and air-drying device according to claim 1, characterized in that, The front end of the housing is provided with a kit, which is mounted on the housing.

3. The efficient sandstone dewatering and air-drying device according to claim 2, characterized in that, The conveying device includes a second mud pump; the input end of the second mud pump is connected to the fine particle collection tank, the output end is connected to one end of the mud conveying pipe, and the other end of the mud conveying pipe is connected to one end of the fixed mud pipe; the fixed mud pipe is installed on the kit, and the other end of the fixed mud pipe is connected to the inner cavity of the drum.

4. The efficient sandstone dewatering and air-drying device according to claim 3, characterized in that, The roller is provided with a rotary vent joint at a position corresponding to the fixed mud pipe. The rotary vent joint is coaxially arranged with the roller and rotatably connected to the roller. The fixed mud pipe is installed at the center position of the rotary vent joint, and a sealing element is provided between the outer wall of the fixed mud pipe and the rotary vent joint.

5. The efficient sandstone dewatering and air-drying device according to claim 4, characterized in that, The roller includes a dehydration and drying section at the front end and a filtration section at the end; wherein the bending blade is disposed in the dehydration and drying section; a screen is disposed on the filtration section; and a discharge port is disposed at the bottom of the outer shell at a position corresponding to the screen, and a discharge trough is disposed at the discharge port.

6. The efficient sandstone dewatering and air-drying device according to claim 5, characterized in that, The rotary drive mechanism includes a rotary motor mounted on the frame and a drive gear mounted on the rotary motor; a driven gear is provided on the outer wall of the drum, and a clearance groove is provided on the outer shell at a position corresponding to the driven gear; the drive gear meshes with the driven gear.

7. The efficient sandstone dewatering and air-drying device according to claim 6, characterized in that, The dehydration and drying device further includes a heating device for heating the drum. The heating device includes a hot air inlet on the kit, an air inlet on the rotary vent joint, and a steam heat exchange chamber between the outer and inner walls of the drum. The hot air inlet is connected to a hot air delivery pipe. The gaps in the kit form a hot air delivery channel connecting the hot air inlet and the air inlet. The air inlet is connected to the steam heat exchange chamber. The steam heat exchange chamber is located in the dehydration and drying section of the drum.

8. The efficient sandstone dewatering and air-drying device according to claim 7, characterized in that, The air inlets are in multiple sets, and the multiple sets of air inlets are evenly arranged along the circumference of the rotary vent joint; the steam heat exchange chambers are in multiple sets, and each set of steam heat exchange chambers is connected to each set of air inlets.

9. The efficient sandstone dewatering and air-drying device according to claim 8, characterized in that, It also includes an angle adjustment device for adjusting the angle of the dehydration and drying device. The angle adjustment device includes a base frame, a front connecting rod, a rear connecting rod and a hydraulic cylinder mounted on the base frame. The front connecting rod and the rear connecting rod are in two sets. The upper end of each set of front connecting rods and the lower end of each set of rear connecting rods are hinged to the frame and the base frame respectively. The cylinder body of the hydraulic cylinder is hinged to the base frame, and the hydraulic rod of the hydraulic cylinder is hinged to the frame.

10. The high-efficiency sand and gravel dewatering and drying device according to claim 8, characterized in that, The outer shell is provided with a water collection tank at the end of the dehydration and drying section, and the end of the steam heat exchange cavity is connected to the water collection tank.

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