A cascade countercurrent swing type sand drying device

Abstract

The application discloses a kind of cascade countercurrent swing type sand drying device, belong to dry-mixed mortar technical field;The device includes box, multiple groups of grid plate components, flow guide unit and gas distribution unit;Box both ends are provided with hollow shaft, can swing back and forth around shaft between 0 and 180 °;Grid plate component is arranged along the length direction of box, forms first drying channel and second drying channel alternately distributed;Flow guide unit is set to the both sides of box with up and down dislocation, with adjacent drying channel communication, after the swing of box is completed, sand is stepped to next channel, forms serpentine material path;Gas distribution unit supplies hot air to box by rotary joint and exports humid hot air.The application uses parallel gas supply and vertical countercurrent heat exchange, inlet temperature is low, and sand temperature is low;Multiple step drying is realized by box swing, and uniformity is good;Hot air closed loop circulation, energy saving and environmental protection.

Description

Technical Field

[0001] This invention relates to the technical field of dry-mixed mortar, and more specifically, to a stepped counter-current oscillating sand drying device. Background Technology

[0002] Dry-mixed mortar is an indispensable building material in construction projects, composed of cementitious materials, dried aggregates (sand), and additives mixed in a certain proportion. Among these, the moisture content of the aggregates (sand) is a key indicator affecting the quality of dry-mixed mortar—according to industry standards, the moisture content of dry sand used in dry-mixed mortar must be below 0.5%. Therefore, sand drying is a core process in the production of dry-mixed mortar.

[0003] In the prior art disclosed in CN102997647A, a three-pass rotary drying drum includes an outer cylinder, a middle cylinder, and an inner cylinder. Raw sand sequentially passes through the inner cylinder, middle cylinder, and outer cylinder to complete three stages of heat exchange. During operation, a fluidized bed furnace heats air to over 700°C, and the high-temperature hot air is introduced into the drum to exchange heat with the wet sand. However, this prior art requires heating the air to extremely high temperatures, resulting in high energy consumption and the need for additional cooling; furthermore, it relies on coal-fired heating in the fluidized bed furnace, leading to severe pollution and poor environmental performance.

[0004] Therefore, there is an urgent need for a sand drying device with low inlet temperature, low outlet temperature, recyclable hot air, and clean and environmentally friendly operation. Summary of the Invention

[0005] To address the above deficiencies, this invention provides a stepped counter-current oscillating sand drying device to solve the aforementioned problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a stepped countercurrent oscillating sand drying device, comprising: The box has hollow shafts at both ends, which are rotatably mounted on the support frame, allowing the box to swing back and forth. Multiple sets of grid plate assemblies are disposed inside the chamber and arranged along the length of the chamber; each set of grid plate assemblies includes a first grid plate and a second grid plate arranged in parallel and at intervals, the gap between the first grid plate and the second grid plate forms a first drying channel, and the gap between two adjacent sets of grid plate assemblies forms a second drying channel. Multiple flow guiding units are set on the upper and lower sides of the box and are staggered to enable the material to be transferred stepwise between the first drying channel and the second drying channel after the box has finished swinging. The air distribution unit is located outside the enclosure and is used to introduce hot air into the second grid plate and exhaust humid and hot air through the second grid plate. In this process, the material falls freely in the first and second drying channels, forming a counter-current heat exchange with the hot air sprayed from the second grid plate from bottom to top.

[0007] Furthermore, the grid assembly includes: The first grid plate has a smooth, non-porous surface. The second grid plate is parallel to and spaced apart from the first grid plate to form the first drying channel. It has an air inlet passage and an air return passage inside. The two sides of the second grid plate are centrally symmetrical. One side has at least one row of nozzles at the bottom and an air return chamber at the top. The other side has at least one row of nozzles at the top and an air return chamber at the bottom. The nozzle is connected to the air inlet passage, and the air return chamber is connected to the air return passage; a herringbone anti-clogging cover is provided above the nozzle, the herringbone anti-clogging cover covers the nozzle, and the width of the cover is smaller than the width of the drying channel.

[0008] Furthermore, the flow guiding unit includes: An inclined flow guide cavity, one end of which is connected to either the first drying channel or the second drying channel; A vertical guide cavity, one end of which is connected to the adjacent second drying channel or the first drying channel; its side is connected to the other end of the inclined guide cavity, and its lower end is provided with a narrowing opening; The storage cavity is located below the narrowing opening, and its central axis is offset from the central axis of the vertical guide cavity; A sealing component, located at the narrowing opening, is used to control the release of material.

[0009] Furthermore, the sealing component includes: The sealing frame is slidably mounted on multiple legs, which are fixed to the housing. A sealing head is disposed on the sealing frame and opposite to the narrowing opening, and is used to open or close the narrowing opening; Electric push rods are located on both sides below the sealing frame and fixed to the support legs. Their telescopic ends are connected to the sealing frame and are used to drive the sealing frame to move laterally.

[0010] Furthermore, electromagnetic vibrators are uniformly installed on the outer side wall of each of the aforementioned flow guiding units.

[0011] Furthermore, the air distribution unit includes an air inlet pipe located on one side of the outer casing and connected to the air inlet passage, an air outlet pipe located on the other side of the outer casing and connected to the air return passage, and a rotary joint located at the end of the hollow shaft. The air inlet pipe is connected to one of the hollow shafts and is used to introduce hot air into the casing; the air outlet pipe is connected to the other hollow shaft and is used to exhaust humid and hot air out of the casing.

[0012] Furthermore, a drive device is connected to the hollow shaft at one end of the housing, which is used to drive the housing to swing back and forth between the two extreme positions of 0° and 180°.

[0013] Furthermore, the rotary joints at both ends of the housing are used to connect the air intake and air return of the hot air circulation system, respectively.

[0014] Furthermore, it also includes: a feeding funnel and a discharge pipe; the feeding funnel is located above the box and is connected to the drying channel at the first end; the discharge pipe is located below the box and is connected to the drying channel at the last end.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. By adopting a parallel air supply method and a vertical countercurrent heat exchange design, high-efficiency drying can be achieved without the high-temperature hot air required by traditional equipment. The sand outlet temperature is mild and no additional cooling is required. At the same time, the heat is fully absorbed, significantly reducing system energy consumption and equipment investment. 2. By combining the swing of the box with the staggered flow guiding units, the sand is transferred in a step-by-step serpentine manner. Each grain of sand passes through multiple drying channels in sequence, and the residence time can be flexibly controlled by the number of swings, resulting in good drying uniformity. 3. It adopts a triple non-contact anti-clogging mechanism consisting of a herringbone anti-clogging cover (physical isolation), an electromagnetic vibrator (high-frequency vibration fluidization), and an eccentric storage chamber (gravity guidance), which effectively prevents wet sand from clogging and meets the drying requirements of high-humidity materials. 4. A closed-loop hot air circulation system is adopted. The hot and humid air is dehumidified in the regenerable drying box and then returned to the hot air furnace for reheating, forming a closed loop. The heat is repeatedly utilized, which significantly improves the thermal efficiency. At the same time, an electric magnetic tube hot air furnace is used as the heat source, with an electrothermal conversion efficiency of over 98%. The heating process has no open flame and no combustion exhaust emissions, making it environmentally friendly. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a stepped counter-current oscillating sand drying device according to the present invention; Figure 2 yes Figure 1 A side view diagram; Figure 3 This is a sectional view of the box. Figure 4 This is a cross-sectional view of the box after it has been swung 180°. Figure 5 This is a side sectional view of the second grid plate; Figure 6 This is a front view schematic diagram of the second grid plate; Figure 7 This is a side sectional view of the flow guiding unit; In the diagram: 1. Box body; 2. Hollow shaft; 3. Support frame; 4. First grid plate; 5. Second grid plate; 6. First drying channel; 7. Second drying channel; 8. Guide unit; 9. Air inlet pipe; 10. Air outlet pipe; 11. Rotary joint; 12. Nozzle; 13. Air return chamber; 14. Herringbone anti-clogging cover; 15. Angled guide chamber; 16. Vertical guide chamber; 17. Storage chamber; 18. Sealing head; 19. Sealing frame; 20. Support leg; 21. Electric push rod; 22. Electromagnetic vibrator; 23. Feed funnel; 24. Discharge pipe. Detailed Implementation

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0018] Example 1

[0019] like Figures 1 to 7 As shown in the figure, the step-countercurrent swing sand drying device provided in this embodiment includes a box 1, multiple sets of grid plate assemblies, a flow guiding unit 8, a gas distribution unit, a feed funnel 23, and a discharge pipe 24.

[0020] The housing 1 is a square structure, horizontally positioned, with hollow shafts 2 welded to both ends. The hollow shafts 2 are mounted on a support frame 3 via bearings and bearing seats, allowing the housing 1 to be suspended in the air. The housing 1 is constructed entirely of Q345B carbon steel, with a wall thickness of 8-12mm, and its inner and outer surfaces are coated with high-temperature resistant and rust-proof paint. The gap between the inner wall of the housing 1 and the grid assembly is filled with aluminum silicate fiber insulation cotton, 50-100mm thick. Simultaneously, the outer periphery of the housing 1 is wrapped with aluminum silicate fiber insulation cotton (not shown in the figure) to reduce heat loss. The housing 1 can reciprocate between 0° and 180° around the hollow shafts 2 under the drive of a driving device.

[0021] The hollow shaft 2 is made of 45# steel with a heat treatment process and a shaft diameter of 80-120mm. It has internal ventilation channels for the introduction or exhaust of hot air. The connection between the hollow shaft 2 and the housing 1 is reinforced with welded ribs to ensure connection strength.

[0022] The support frame 3 is welded from I-beams or square steel tubes and fixed to the ground at the bottom with anchor bolts. Self-aligning roller bearing housings are installed on the support frame 3 to support the hollow shaft 2. The bearing housings have a split structure for easy installation and maintenance.

[0023] As a preferred option, the hollow shaft 2 can be replaced with a supporting rotating cylinder (not shown in the figure). The outer side of this supporting sleeve is equipped with an annular raceway, the surface of which is hardened to a hardness of HRC45-50. Two to four sets of roller assemblies are installed on the support frame 3, each set consisting of two rollers and a roller seat. The rollers are machined from cast steel, with hardened surfaces, forming a rolling friction fit with the raceway of the supporting rotating cylinder. Bearings are installed inside the roller seats, allowing the rollers to rotate freely. The rollers bear the entire weight of the housing 1, and the low-friction reciprocating oscillation of the housing 1 is achieved through the rolling support of the rollers. Compared with the hollow shaft support scheme, the roller support scheme has the advantages of high load-bearing capacity, convenient installation and commissioning, and suitability for large and heavy equipment, especially suitable for large drying equipment with a housing length exceeding 3 meters or a weight exceeding 5 tons. It should be noted that when using the roller support scheme, the air inlet pipe 9 and the air outlet pipe 10 extend from inside the supporting rotating cylinder and are directly connected to the rotary joint 11.

[0024] Multiple sets of grid plate assemblies are disposed inside the housing 1 and arranged along the length of the housing 1. Each set of grid plate assemblies includes a first grid plate 4 and a second grid plate 5 arranged in parallel and at intervals.

[0025] The first grid plate 4 is made of 304 stainless steel plate, with a thickness of 3-5mm. The surface is smooth and non-porous, and polished to reduce the coefficient of friction, used to guide the sand to fall. The two ends of the first grid plate 4 are welded and fixed to the inner wall of the box 1.

[0026] The second grid plate 5 is made of 304 stainless steel plate with a thickness of 5-8mm. It is parallel to and spaced apart from the first grid plate 4, and the gap between them forms the first drying channel 6. The second grid plate 5 has an air inlet passage and an air return passage with a cross-sectional dimension of 20×20mm to 30×30mm. The two sides of the second grid plate 5 are centrally symmetrically arranged: one side has at least one row of nozzles 12 at the bottom and an air return chamber 13 at the top; the other side has at least one row of nozzles 12 at the top and an air return chamber 13 at the bottom. The depth of the air return chamber 13 is 30-50mm.

[0027] The width of both the first drying channel 6 and the second drying channel 7 is 30-50 mm, and the inner walls of the channels are polished. The first drying channel 6 is located between the first grid plate 4 and the second grid plate 5, and the second drying channel 7 is located between two adjacent grid plate assemblies.

[0028] Nozzle 12 is made of wear-resistant ceramic or hard alloy material, vertically installed inside the lower part of the first drying channel 6, and connected to the air inlet passage in the second grid plate 5 via a bent pipe. The outlet diameter of nozzle 12 is 3-8mm, and the spray angle is 45°-60°. A herringbone anti-clogging cover 14 is installed above nozzle 12, made of 304 stainless steel sheet, stamped with a thickness of 1.5-2.5mm, in a herringbone shape, covering nozzle 12, and its width is smaller than the width of the drying channel. The included angle of the herringbone anti-clogging cover 14 is 90°-120°, and its surface is polished. A 5-10mm side gap is left between the herringbone anti-clogging cover 14 and the first grid plate 4 and the second grid plate 5 as a hot air passage.

[0029] like Figure 7 As shown, the flow guiding unit 8 is welded from 304 stainless steel plate with a wall thickness of 3-5mm. It includes an inclined flow guiding cavity 15, a vertical flow guiding cavity 16, a storage cavity 17, and a sealing assembly.

[0030] The inclined guide cavity 15 is an inclined channel with an inclination angle of 30°-60°. One end of it is connected to the first drying channel 6 or the second drying channel 7. The inner wall of the inclined guide cavity 15 is polished, and the surface roughness is ≤0.8μm.

[0031] The vertical guide cavity 16 has a cross-sectional dimension of 30-50mm × 30-50mm, is located on one side of the inclined guide cavity 15, and is connected to the other end of the inclined guide cavity 15. Simultaneously, the vertical guide cavity 16 is connected to another adjacent drying channel. The lower end of the vertical guide cavity 16 has a narrowed opening.

[0032] The storage chamber 17 is located below the narrowed opening, and its volume is determined based on the single batch processing volume. The central axis of the storage chamber 17 is offset from the central axis of the vertical guide chamber 16 by a distance of 5-15mm. That is, the central axis of the storage chamber 17 is offset away from the inclined guide chamber 15, so that when the sand enters the next channel, it is deviated from the inlet of the inclined guide chamber 15, thus preventing sand backflow.

[0033] The flow guiding units 8 are arranged on the upper and lower sides of the housing 1 in an alternating manner. Specifically, the flow guiding units 8 include an upper flow guiding unit and a lower flow guiding unit.

[0034] The upper guide unit is located on the upper side of the housing 1. The inlet of its inclined guide cavity 15 is connected to the second drying channel 7, and the outlet of its vertical guide cavity 16 is connected to the first drying channel 6.

[0035] The lower guide unit is located on the lower side of the housing 1. The inlet of its inclined guide cavity 15 is connected to the first drying channel 6, and the outlet of its vertical guide cavity 16 is connected to the second drying channel 7.

[0036] By utilizing the upper and lower guide units: after the sand passes through the first drying channel 6, the inclined guide cavity 15 of the lower guide unit guides the sand into the vertical guide cavity 16 and stores it in the storage cavity 17; after the box 1 has finished swinging, the sealing head 18 opens, and the sand falls into the adjacent second drying channel 7; at the same time, the sand passes through the second drying channel 7 and falls back into the upper guide unit, and so on, step by step, forming a serpentine material path, and finally discharged from the discharge pipe 24 at the tail end. Throughout the process, the sand completes one channel switch every time it passes through a guide unit, and multiple, multi-stage drying is achieved through the reciprocating swing of the box 1.

[0037] The sealing assembly is located at the outlet of the storage chamber 17 to control the release of material. It includes a sealing frame 19, a support leg 20, a sealing head 18, and an electric push rod 21.

[0038] The support legs 20 are made of 304 stainless steel square tubing and are welded and fixed to the box body 1. There are 4-6 of them.

[0039] The sealing frame 19 is welded from 304 stainless steel square tubing and can be slidably mounted on the support leg 20 via linear bearings or sliding bushings.

[0040] The sealing head 18 is made of polyurethane or wear-resistant rubber material and is installed on the crossbar of the sealing frame 19, opposite to the narrowing opening, for opening or closing the narrowing opening. The front end of the sealing head 18 is designed to be conical or spherical to facilitate closing the narrowing opening.

[0041] Electric actuators 21 are located on both sides below the sealing frame 19. They are 24V DC electric actuators with a stroke of 20-50mm and a thrust of 100-300N. Their fixed ends are mounted on one set of support legs 20, and their telescopic ends are connected to the sealing frame 19 to drive its lateral movement. The telescopic speed of the electric actuators 21 is adjustable and they are equipped with position feedback sensors.

[0042] The electromagnetic vibrator 22 consists of multiple CZ10 type electromagnetic vibrators, installed on the outer wall of the flow guiding unit 8, evenly arranged along the length of the flow guiding unit 8, with the number determined by the length of the flow guiding unit 8. The entire machine weighs 2kg, has a vibration force of 10kg, a power of 8W, a voltage of 220V, a vibration frequency of 3000 times / min, and an amplitude of 1.5-4mm. The electromagnetic vibrator 22 is controlled in an intermittent working mode, vibrating for 5-10 seconds every 30-60 seconds.

[0043] The air distribution unit is located on the left and right sides of the housing 1, including an air inlet pipe 9 on one side of the housing 1, an air outlet pipe 10 on the other side of the housing 1, and a rotary joint 11 at the end of the hollow shaft 2. The air inlet pipe 9 and the air outlet pipe 10 are made of 304 stainless steel pipe with an outer aluminum silicate insulation layer, and have a pipe diameter of DN50-DN100. The rotary joint 11 is a large-diameter high-temperature rotary joint, using graphite or mechanical seals, with a temperature resistance ≥250℃ and a pressure resistance ≥1.0MPa. The air inlet pipe 9 connects to the rotary joint 11 of one of the hollow shafts 2 to introduce hot air into the housing 1. The air outlet pipe 10 connects to the rotary joint 11 of the other hollow shaft 2 to exhaust humid and hot air from the housing 1.

[0044] The feed hopper 23 is located above the housing 1 and is welded from 304 stainless steel plate with a polished inner wall. It is connected to the first drying channel 6 or the second drying channel 7 located at the beginning. A grid screen is provided at the inlet of the feed hopper 23 to remove large particles of impurities.

[0045] The discharge pipe 24 is located below the box body 1 and is made of 304 stainless steel pipe. It is connected to the first drying channel 6 or the second drying channel 7 located at the tail end.

[0046] It should be noted that in this embodiment, the total amount of sand injected into the feeding funnel 23 each time is matched with the volume of the storage cavity 17 in the guide unit 8, so as to ensure that the sand can fill the storage cavity 17, and the sealing head 18 is used to seal the storage cavity 17 to prevent the sand from leaking during the swinging process of the box 1. At the same time, the sand can fill the storage cavity 17, avoiding the problem of sand accumulating on one side when the box 1 swings, and ensuring that the sand passes through the first drying channel 6 or the second drying channel 7 evenly.

[0047] The working process of this embodiment is as follows: Feeding stage: The sand to be dried is quantitatively conveyed to the feeding hopper 23 by the conveyor belt, and then enters the box 1 through the feeding hopper 23, falling into the first drying channel 6 or the second drying channel 7 at the head end, and falling downwards under the action of gravity.

[0048] Swinging and step-by-step transfer stage: Sand falls from the current drying channel into the lower guide unit 8, passes through the inclined guide cavity 15 and the vertical guide cavity 16, and finally enters the storage cavity 17. After a certain period of time, all the sand falls into the storage cavity 17. At this time, the electric push rod 21 drives the sealing frame 19 to move laterally, and the sealing head 18 blocks the narrowed opening, and the sand is temporarily stored in the storage cavity 17.

[0049] The drive unit drives the housing 1 to swing from 0° to 180°. During the swinging process, the sand fills the storage cavity 17 and is blocked by the sealing head 18, thus preventing the sand from flowing in the storage cavity 17 due to the swing.

[0050] When the chamber 1 swings to 180°, the electric push rod 21 drives the sealing frame 19 to move in the opposite direction, and the sealing head 18 moves out of the narrowing opening, opening the narrowing opening. At this time, the sand in the storage chamber 17 falls into the next adjacent drying channel by gravity, and after a certain period of time, all the sand falls into the subsequent guiding unit 8. Then, the electric push rod 21 drives the sealing frame 19 to move laterally, so that the sealing head 18 blocks the narrowing opening.

[0051] The sealing head 18 blocks the narrowed opening. At this time, the drive device drives the housing 1 to swing in the opposite direction, returning from 180° to 0°.

[0052] By repeating the above process, the sand passes through multiple drying channels in a step-by-step manner, forming a serpentine material path.

[0053] Drying stage: Hot air enters the air intake passage of the second grid plate 5 through the air inlet pipe 9, hollow shaft 2, and rotary joint 11, and is ejected from the nozzle 12. The ejected hot air changes direction after encountering the herringbone anti-blocking cover 14, and diffuses obliquely upward along the slope of the anti-blocking cover, forming a counter-current heat exchange with the sand falling from above. The humid and hot air after passing through the sand layer exits the chamber 1 through the return air chamber 13, return air passage, hollow shaft 2, and air outlet pipe 10, enters the external regenerative drying chamber for dehumidification, and then returns to the hot air furnace for reheating, forming a closed loop cycle.

[0054] Discharge stage: After passing through all the drying channels, the sand falls from the drying channel at the tail end into the discharge pipe 24 and is discharged from the box 1.

[0055] Example 2

[0056] This embodiment is basically the same as Embodiment 1, except that the independent nozzle 12 on the second grid plate 5 is replaced with a transverse nozzle. The transverse nozzle is arranged along the length of the second grid plate 5, and multiple air jet holes are evenly distributed on the nozzle. The diameter of the air jet holes is 5mm, and the spacing is 60mm. A herringbone anti-clogging cover 14 is set above each air jet hole and is fixedly connected to the transverse nozzle. The transverse nozzle is directly connected to the air intake passage, eliminating the need for mounting holes and sealing structures for independent nozzles, making processing simpler and less prone to clogging.

[0057] Example 3

[0058] This embodiment is basically the same as Embodiment 1, except that the hot air circulation system uses a combination of an electric magnetic coil hot air furnace and a regenerable drying chamber. The electric magnetic coil hot air furnace has a heating temperature of 150-180℃, a thermal efficiency of over 98%, and a temperature control accuracy of ±1℃. The regenerable drying chamber is filled with activated alumina adsorbent, and the two adsorption channels work alternately: while one channel is adsorbing and dehumidifying, the other channel is regenerated through electric heating, ensuring continuous dehumidification capability.

[0059] Example 4

[0060] This embodiment is basically the same as Embodiment 1, except that the drive device uses a combination of a servo motor, a worm gear reducer, and a gear set. The worm gear reducer has a speed ratio of 40 and a self-locking function. After the housing 1 swings to its position, even if the motor is powered off, the self-locking action of the worm gear can keep the housing 1 in its current position, preventing accidental rotation due to center of gravity shift or inertia.

[0061] The above technical solutions only embody the preferred technical solutions of the present invention. Any modifications that may be made by those skilled in the art to certain parts thereof embody the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A stepped counter-current oscillating sand drying device, characterized in that, include: The box has hollow shafts at both ends, which are rotatably mounted on the support frame, allowing the box to swing back and forth. Multiple sets of grid plate assemblies are disposed inside the chamber and arranged along the length of the chamber; each set of grid plate assemblies includes a first grid plate and a second grid plate arranged in parallel and at intervals, the gap between the first grid plate and the second grid plate forms a first drying channel, and the gap between two adjacent sets of grid plate assemblies forms a second drying channel. Multiple flow guiding units are set on the upper and lower sides of the box and are staggered to enable the material to be transferred stepwise between the first drying channel and the second drying channel after the box has finished swinging. The air distribution unit is located outside the enclosure and is used to introduce hot air into the second grid plate and exhaust humid and hot air through the second grid plate. In this process, the material falls freely in the first and second drying channels, forming a counter-current heat exchange with the hot air sprayed from the second grid plate from bottom to top.

2. The stepped counter-current oscillating sand drying device according to claim 1, characterized in that, The grid assembly includes: The first grid plate has a smooth, non-porous surface. The second grid plate is parallel to and spaced apart from the first grid plate to form the first drying channel. It has an air inlet passage and an air return passage inside. The two sides of the second grid plate are centrally symmetrical. One side has at least one row of nozzles at the bottom and an air return chamber at the top. The other side has at least one row of nozzles at the top and an air return chamber at the bottom. The nozzle is connected to the air inlet passage, and the air return chamber is connected to the air return passage; a herringbone anti-clogging cover is provided above the nozzle, the herringbone anti-clogging cover covers the nozzle, and the width of the cover is smaller than the width of the drying channel.

3. The stepped counter-current oscillating sand drying device according to claim 1, characterized in that, The flow guiding unit includes: An inclined flow guide cavity, one end of which is connected to either the first drying channel or the second drying channel; A vertical guide cavity, one end of which is connected to the adjacent second drying channel or the first drying channel; its side is connected to the other end of the inclined guide cavity, and its lower end is provided with a narrowing opening; The storage cavity is located below the narrowing opening, and its central axis is offset from the central axis of the vertical guide cavity; A sealing component, located at the narrowing opening, is used to control the release of material.

4. The stepped counter-current oscillating sand drying device according to claim 3, characterized in that, The blocking assembly includes: The sealing frame is slidably mounted on multiple legs, which are fixed to the housing. A sealing head is disposed on the sealing frame and opposite to the narrowing opening, and is used to open or close the narrowing opening; Electric push rods are located on both sides below the sealing frame and fixed to the support legs. Their telescopic ends are connected to the sealing frame and are used to drive the sealing frame to move laterally.

5. A stepped counter-current oscillating sand drying device according to claim 1, characterized in that, Electromagnetic vibrators are uniformly installed on the outer side wall of each of the aforementioned flow guiding units.

6. The stepped counter-current oscillating sand drying device according to claim 1, characterized in that, The air distribution unit includes an air inlet pipe located on one side of the outer casing and connected to the air inlet passage, an air outlet pipe located on the other side of the outer casing and connected to the air return passage, and a rotary joint located at the end of the hollow shaft. The air inlet pipe is connected to one of the hollow shafts and is used to introduce hot air into the casing; the air outlet pipe is connected to the other hollow shaft and is used to exhaust humid and hot air out of the casing.

7. A stepped counter-current oscillating sand drying device according to claim 1, characterized in that, The hollow shaft at one end of the housing is connected to a drive device, which is used to drive the housing to swing back and forth between two extreme positions of 0° and 180°.

8. A stepped counter-current oscillating sand drying device according to claim 6, characterized in that, The rotary joints at both ends of the housing are used to connect the air intake and air return of the hot air circulation system, respectively.

9. A stepped counter-current oscillating sand drying device according to claim 1, characterized in that, Also includes: Feed hopper and discharge pipe; The feeding hopper is located on top of the chamber and is connected to the drying channel at the beginning. The discharge pipe is located at the bottom of the chamber and is connected to the drying channel at the tail end.

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