Quick-connection fan for granary ventilation and operation method of quick-connection fan

Abstract

The invention relates to the technical field of ventilation equipment, and provides a quick-connection draught fan for granary ventilation and an operation method thereof.The quick-connection draught fan comprises a draught fan body, a flexible air pipe, a leveling device, an inflation sealing ring and an inflation sealing device, the head end of the flexible air pipe is connected with an air outlet of the draught fan body, the tail end of the flexible air pipe is connected with a connector, and the connector is used for being connected with a granary air opening in an inserted mode; the outer diameter of the inflation sealing ring is expanded in an inflation state, and the inflation sealing ring is in sealed connection with the inner wall of the granary tuyere; the inflatable sealing device is communicated with the inflatable sealing ring through an air path and is used for supplying air to the inflatable sealing ring to expand the inflatable sealing ring; the leveling device is arranged on the draught fan body and used for adjusting the height and the posture of the flexible air pipe, and therefore the terrain height and angle deviation is compensated. The air-tight connection between the fan and the granary air port can be realized, and the functions of automatic leveling, pressure monitoring and intelligent air supply are supported, so that the operation efficiency and the operation stability of a granary ventilation system are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ventilation equipment, in particular to a quick connection fan for grain warehouse ventilation and an operation method thereof. BACKGROUND

[0002] In the field of grain storage, in order to prevent mold and insect damage caused by the accumulation of heat and humidity in the grain pile, regular forced ventilation of the grain warehouse is required. This process usually involves using an external fan to supply air to the interior of the grain warehouse, effectively regulating the temperature and humidity of the grain pile, inhibiting microbial activity, delaying grain aging, and ensuring the quality of stored grain.

[0003] Currently, traditional ventilation methods often use canvas air pipes as a flexible connection device between the fan and the grain warehouse air inlet. Although canvas air pipes have a certain degree of flexibility and foldability, making them convenient for transportation and temporary installation, they have the following drawbacks in actual application: 1. The size of the grain warehouse air inlet varies, with a common diameter of 500-600mm, while the outlet diameter of traditional fans is fixed, requiring the use of adapter flanges or multiple specifications of interfaces to achieve matching. This process is time-consuming and tedious, and the interface often leaks due to poor centering or aging of the sealing material, severely affecting ventilation efficiency; 2. The ground around the grain warehouse often has slopes, unevenness, etc., causing the fan to be placed at an angle, making it difficult to align the fan outlet with the grain warehouse air inlet. Existing equipment often uses adjustable legs for manual leveling, which is inconvenient and low in precision, cannot achieve dynamic compensation, and is prone to excessive bending of the air pipe, increasing air resistance and being tedious to operate; 3. Most current sealing methods rely on rubber gaskets or manual clamping structures, lacking real-time monitoring and pressure maintenance functions for the sealing state, and are prone to sealing failure due to vibration during operation; 4. From equipment handling, positioning, leveling, and connection to sealing completion, the entire process relies on multiple people and experience to judge, with a long average connection time per operation, making it difficult to meet the needs of large-scale grain storage for efficient rotation ventilation. Therefore, improvements and developments are needed to address the above issues. SUMMARY

[0004] The present application provides a quick connection fan for grain warehouse ventilation and an operation method thereof, aiming to solve the problems in the background art. The specific implementation is as follows: A quick connection fan for grain warehouse ventilation, comprising a fan body, a flexible air pipe, a leveling device, an inflatable sealing ring, and an inflatable sealing device. The first end of the flexible air pipe is connected to the air outlet of the fan body, and the end is connected with an interface. The interface is used to plug into the grain warehouse air inlet. The inflatable sealing ring is sleeved around the interface, and in the inflated state, its outer diameter expands and forms a sealed connection with the inner wall of the grain warehouse air inlet. The inflatable sealing device is in communication with the inflatable sealing ring through an air path, and is used to supply air to the inflatable sealing ring to make it expand, so as to realize the air-tight connection between the interface and the grain warehouse air inlet. The leveling device is arranged on the fan main body, and is used for adjusting the height and posture of the flexible air pipe to adapt to the ground slope, aligning the outlet air axis with the grain bin air outlet axis, and compensating for the height and angle deviation of the terrain.

[0005] As a further scheme of the present application, the inflatable sealing ring is an annular elastic rubber capsule structure, which is sleeved on the outer periphery of the interface. In the inflated state, the inflatable sealing ring expands radially, and the outer wall of the inflatable sealing ring is in sealing connection with the inner wall of the grain bin air outlet.

[0006] As a further scheme of the present application, the inflatable sealing device comprises a gas pump, which is in communication with the inflatable sealing ring through a gas path, and is used for conveying gas to the inflatable sealing ring to achieve expansion sealing. An air inlet electromagnetic valve is arranged on the pipeline between the gas pump and the inflatable sealing ring, and is used for controlling the inflation and interruption. An air outlet electromagnetic valve is arranged on the pipeline between the gas pump and the inflatable sealing ring, and is used for controlling the inflation and interruption.

[0007] As a further scheme of the present application, the inflatable sealing device further comprises a pressure transmitter, which is arranged in the gas path of the inflatable sealing ring, and is used for monitoring the inflation pressure of the inflatable sealing ring in real time.

[0008] As a further scheme of the present application, the leveling device comprises a lifting cylinder and a pump station. The lifting cylinder is arranged on the fan main body, and is used for supporting the fan main body and adjusting the height of the fan main body. The pump station is connected with the lifting cylinder to achieve the posture adjustment of the fan main body.

[0009] As a further scheme of the present application, the lifting cylinder is provided with a plurality of lifting cylinders, which are uniformly distributed along the circumference of the fan main body and arranged around the periphery of the fan main body. Each lifting cylinder is connected with the pump station through a hydraulic branch.

[0010] As a further scheme of the present application, the leveling device further comprises an inclination sensor, which is arranged on the fan main body, and is used for detecting the inclination angle of the fan main body in real time to realize the alignment of the outlet air axis with the grain bin air outlet axis.

[0011] As a further scheme of the present application, the output end of the lifting cylinder is provided with a ball head, and the fan main body is provided with a ball head flange matched with the ball head. The ball head flange and the ball head form a spherical pair connection.

[0012] As a further scheme of the present application, the fan main body is provided with an air pipe support, and the interface is provided with a limiting ring corresponding to the air pipe support. The limiting ring is detachably connected to the interface, and is used for limiting the position of the flexible air pipe.

[0013] Additionally, this invention provides a method for operating a quick-connect fan, including the quick-connect fan, the method comprising the following steps: S1. Move the main body of the fan to the vicinity of the target grain warehouse by traction or pushing, and adjust its orientation so that the air outlet of the fan body faces the air outlet of the grain warehouse. S2. Start the pump station, drive multiple lifting cylinders to move, combine the real-time feedback of the fan body attitude signal from the tilt sensor, and coordinate the adjustment of the stroke of each lifting cylinder. S3. Remove the limit ring and connect the interface to the grain warehouse vent. S4. Start the inflation sealing device and use an air pump to deliver gas into the inflation sealing ring, causing the inflation sealing ring to expand and form a sealed connection with the inner wall of the grain silo vent. S5. Start the main body of the fan for ventilation. During operation, the pressure transmitter continuously monitors the pressure inside the air-filled sealing ring. When the pressure is lower than the preset lower limit, start the air pump to replenish air. S6. After ventilation is complete, open the exhaust solenoid valve to release the pressure from the inflatable sealing ring. After the inflatable sealing ring contracts, pull out the interface, retract the flexible duct, and return it to the duct support to complete the operation.

[0014] Due to the adoption of the above technical solutions, the beneficial technical effects of the present invention are as follows: 1. This invention sets an inflatable sealing ring at the interface and equips it with a pressure transmitter to monitor the pressure inside the inflatable sealing ring in real time. It can automatically adjust the expansion amount of the inflatable sealing ring according to the actual size of the grain silo air outlet, so that its outer diameter adaptively forms a sealing connection with the inner wall of the grain silo air outlet of different specifications, thereby achieving an airtight connection between the two. This effectively solves the problems of difficult connection and gas leakage between the fan and the grain silo air outlet, and thus significantly improves the sealing reliability between the fan and the grain silo. 2. This invention, by setting up multiple lifting cylinders and combining them with tilt sensors and pump stations to work together, forms a multi-point support and leveling function. It can monitor the attitude of the main body of the fan and dynamically adjust the height and attitude of the main body of the fan through each lifting cylinder. Even on uneven ground, it can ensure that the air outlet axis of the fan is aligned with the air outlet axis of the grain silo, effectively avoiding the risk of excessive bending or falling off of the flexible air duct due to eccentric connection, thereby significantly improving the operational stability and terrain adaptability of the device. 3. By setting up a pressure transmitter, an inlet solenoid valve, and an exhaust solenoid valve, this invention can collect the air pressure data inside the inflation seal ring in real time, and automatically open and close the inlet solenoid valve to replenish air or open the exhaust solenoid valve to release pressure according to the preset pressure threshold, thereby dynamically maintaining the sealing stability between the blower and the grain silo air outlet, and ensuring that the connection between the blower and the grain silo air outlet is always in the best sealing state. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the structure of a quick-connect fan for grain warehouse ventilation in a specific embodiment of the present invention; Figure 2 This is a left view of a quick-connect fan for grain warehouse ventilation according to a specific embodiment of the present invention; Figure 3 This is a cross-sectional view of a quick-connect fan for grain warehouse ventilation according to a specific embodiment of the present invention; Figure 4 This is a front view of a quick-connect fan for grain warehouse ventilation in a specific embodiment of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of the structure of section A; Figure 6 This is a top view of a quick-connect fan for grain warehouse ventilation in a specific embodiment of the present invention; Figure 7 This is a schematic diagram of the air circuit of the air-filled sealing device in a specific embodiment of the present invention.

[0016] Explanation of reference numerals in the attached figures: 1. Fan body, 2. Fan motor, 3. Fan connector, 4. Flexible duct, 5. Interface, 6. Limiting ring, 7. Inflatable sealing ring, 8. Fixed flange, 9. Duct support, 10. Pump station, 11. Lifting cylinder, 12. Traction rod, 13. Casters, 14. Directional casters, 15. Fan impeller, 16. Ball head, 17. Ball head flange, 18. Air pump, 19. Inlet solenoid valve, 20. Exhaust solenoid valve, 21. Pressure transmitter. Detailed Implementation

[0017] The specific embodiments of the present invention are described below with reference to the accompanying drawings and examples: It should be noted that the structures, proportions, sizes, etc. illustrated in the accompanying drawings of this specification are only used to complement the content disclosed in the specification, so that those skilled in the art can understand and read them, and are not intended to limit the conditions under which the present invention can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0018] Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0019] Example 1, combined with Figures 1 to 7As shown, the present invention provides a quick-connect fan for grain warehouse ventilation and its operation method, including a fan body 1, a flexible air duct 4, a leveling device, an inflatable sealing ring 7, and an inflatable sealing device.

[0020] Specifically, the fan body 1 is a centrifugal ventilation device suitable for high-pressure, high-volume grain silo ventilation operations. It contains a fan impeller 15, driven by a fan motor 2. Centrifugal force draws air in from the inlet, accelerates and pressurizes it, and then discharges it radially, achieving efficient air delivery. The fan motor 2 is installed on the side of the fan body 1 and drives the fan impeller 15 via belt drive. The fan motor 2 is preferably a variable frequency motor, supporting airflow adjustment and energy-saving operation. A fan connector 3 is provided on the outlet side of the fan body 1, forming an outlet to guide airflow output. The outlet is connected to the beginning of a flexible duct 4 via a flange connection structure. Specifically, both the fan connector 3 and the flexible duct 4 have matching flanges, which are fastened with bolts and fitted with sealing gaskets to achieve an airtight connection between the fan connector 3 and the flexible duct 4.

[0021] Furthermore, the air outlet axis of the fan connector 3 is arranged in a straight line with the center line of the fan body 1 to ensure that the airflow direction is consistent and to reduce flow resistance; the flange surface is perpendicular to the airflow direction to ensure uniform and reliable sealing during connection.

[0022] The flexible duct 4 is preferably a spiral steel wire reinforced composite flexible hose, which has high flexibility and pressure resistance. Even when bent, it maintains a constant flow cross-sectional area, effectively compensating for axial, radial, and angular deviations between the fan and the grain silo air outlet, reducing wind resistance and avoiding the risk of detachment due to excessive deformation of the flexible duct 4. An interface 5 is connected to the end of the flexible duct 4 for connecting to the grain silo air outlet. An annular inflatable sealing ring 7 with an elastic rubber bladder structure is fitted around the outer periphery of the interface 5. The inflatable sealing ring 7 is installed on the interface 5 via a fixing flange 8. Its material is preferably silicone or nitrile rubber (NBR), which has good elasticity, wear resistance, and airtightness. When the inflatable sealing ring 7 is inflated, it can tightly fit the inner wall of grain silo air outlets of different diameters, thus significantly improving the sealing performance at the connection between the fan body 1 and the grain silo air outlet.

[0023] The flexible duct 4 is internally supported by high-strength spiral steel wires and externally covered with a layer of PVC-coated polyester fiber or silicone cloth. This structure gives the flexible duct 4 excellent flexibility and compressive strength, allowing it to maintain a constant flow cross-sectional area even under bending, torsion, or external pressure, effectively preventing a sharp increase in wind resistance or airflow interruption due to collapse. The flexible duct 4 compensates for axial distance deviations, radial misalignments, and angular tilts between the fan body 1 and the grain silo air outlet, significantly reducing the accuracy requirements for connection and improving the equipment's adaptability to complex terrain conditions. Simultaneously, its lightweight nature facilitates manual operation.

[0024] An interface 5 is connected to the end of the flexible duct 4. This interface 5 is a rigid connector, preferably made of engineering plastic or lightweight metal, used to insert into the grain silo air vent and achieve mechanical positioning. An annular inflatable sealing ring 7 is fitted around the outer periphery of the interface 5. This inflatable sealing ring 7 has an annular bladder structure and is preferably made of silicone rubber or ethylene propylene diene monomer (EPDM) rubber. The inflatable sealing ring 7 is axially pressed and fixed to the interface 5 by a fixing flange 8. The fixing flange 8 is securely connected to the interface 5 by screws or clamps, thereby ensuring that the inflatable sealing ring 7 does not undergo axial displacement or circumferential slippage during inflation. Furthermore, the inflatable sealing ring 7 is equipped with an air inlet, which is connected to the air supply system of the inflation sealing device via an air pipeline.

[0025] When interface 5 is inserted into the grain silo vent, the inflation program is started. Gas enters the inflation sealing ring 7 and causes it to expand radially. The outer surface of the inflation sealing ring 7 tightly fits the inner wall of the grain silo vent of different diameters, thus forming a reliable interference seal.

[0026] Furthermore, the cross-sectional shape of the inflatable sealing ring 7 can be circular, elliptical, or D-shaped to optimize the contact pressure distribution during expansion, reduce stress concentration, and thus extend service life.

[0027] In another preferred embodiment of the present invention, since the interface 5 and the inflatable sealing ring 7 fitted thereon are easily contaminated by impurities such as grain silo dust and oil during long-term use, or worn due to frequent insertion and removal, resulting in reduced sealing performance, the interface 5 is detachably connected to the end of the flexible duct 4. Specifically, the interface 5 and the flexible duct 4 adopt a detachable sealing connection structure, which can be a clamp type, threaded type, or quick-connect coupling type connection structure to achieve quick installation and reliable sealing. In this embodiment, the flange end of the interface 5 and the pipe opening of the flexible duct 4 are pressed and sealed by a stainless steel double clamp structure, which not only ensures the airtightness of the connection, but also facilitates the quick replacement of the worn interface 5 on the work site. In other embodiments, a threaded joint with an elastic sealing ring or a self-locking quick-connect coupling with a locking mechanism can also be used to further improve the efficiency of disassembly and assembly and the convenience of operation. By setting a detachable connection between the interface 5 and the flexible duct 4, the scrapping of the entire flexible duct 4 can be effectively avoided, thereby significantly reducing maintenance costs and extending the overall service life of the equipment.

[0028] Furthermore, the fan body 1 is provided with a duct support 9 for storing, positioning and supporting the flexible duct 4. A limiting ring 6 is provided at the relative position of the interface 5. The limiting ring 6 is detachably connected to the interface 5 to limit the relative position of the flexible duct 4 when it is not in use or during transportation, thereby preventing the flexible duct 4 from swinging or slipping at will.

[0029] Specifically, the limiting ring 6 is welded to the outer wall of the interface 5, forming an installation channel between them. The duct support 9 is equipped with a sling or hook corresponding to the limiting ring 6. The flexible duct 4 is fixed to the duct support 9 by the sling wrapped around the limiting ring 6. In addition, the sling or hook allows operators to easily and quickly assemble and disassemble the duct, thereby improving on-site work efficiency.

[0030] During the docking operation of the main fan body 1, the operator can first remove the limiting ring 6 from the duct support 9 to release the flexible duct 4 so that its end interface 5 can be inserted into the grain silo air outlet. When the flexible duct 4 is not in operation, the limiting ring 6 and the duct support 9 can work together to achieve orderly storage and stable storage of the flexible duct 4, avoiding wear or entanglement during transportation, thereby improving the overall neatness and service life of the equipment.

[0031] Specifically, the inflatable sealing device includes an air pump 18, an inlet solenoid valve 19, an exhaust solenoid valve 20, and a control module, which are used to achieve rapid sealing and safe release at the connection between the interface 5 and the grain silo vent.

[0032] The air pump 18 serves as a compressed gas power source. Its air inlet is connected to the atmospheric environment and draws in gas for pressurization. Its air outlet is connected to the inflatable sealing ring 7 through an air passage to deliver gas to the inflatable sealing ring 7 to achieve expansion and sealing, thereby driving the inflatable sealing ring 7 to expand radially, thus achieving an interference fit with the inner wall of the grain silo air vent, and thus completing the airtight connection.

[0033] The intake solenoid valve 19 is located on the air supply line between the air pump 18 and the inflation sealing ring 7. It is controlled by the control module. When a seal needs to be established, the control module opens the intake solenoid valve 19 to allow compressed gas to enter the inflation sealing ring 7. When the pressure reaches the preset upper limit, the control module closes the valve to stop the air supply, thereby preventing the inflation sealing ring 7 from being damaged by overpressure.

[0034] The air inlet of the exhaust solenoid valve 20 is connected to the air chamber of the inflatable sealing ring 7, and the air outlet is open to the atmosphere to achieve rapid depressurization of the inflatable sealing ring 7. After the ventilation operation is completed, the control module activates the exhaust solenoid valve 20 to quickly discharge the gas in the inflatable sealing ring 7. At this time, the inflatable sealing ring 7 contracts and resets, making it easy to pull the interface 5 out of the grain silo vent.

[0035] In this embodiment, the control module is located on the blower body 1 and is electrically connected to the air pump 18, the intake solenoid valve 19, and the exhaust solenoid valve 20, respectively, to coordinate and automatically control the various actuators of the inflation sealing device. This control module is an integrated electronic control unit, which can be a microcontroller, a programmable logic controller (PLC), or an embedded control system, and has data acquisition, logic operation, timing control, and output drive functions.

[0036] Specifically, the control module receives pressure signals from the pressure transmitter 21 through digital or analog input ports and determines the current sealing status according to preset control logic; it sends control commands to the air pump 18, the inlet solenoid valve 19 and the exhaust solenoid valve 20 through the output port, thereby realizing the automated operation of the entire process of inflation, pressure holding and pressure release.

[0037] The workflow is as follows: When interface 5 is inserted into the grain silo vent, the operator starts the sealing procedure. The control module then starts the air pump 18 and opens the air intake solenoid valve 19 to supply air to the inflatable sealing ring 7. When the pressure transmitter 21 detects that the pressure inside the sealing ring reaches the preset upper limit (e.g., 80 kPa), the control module shuts off the air pump 18 and the air intake solenoid valve 19 and enters the pressure holding state. During the ventilation process, the pressure is continuously monitored. If it is lower than the set lower limit (e.g., 60 kPa), the air supply is automatically restarted. After the ventilation operation is completed, the control module opens the exhaust solenoid valve 20, which causes the inflatable sealing ring 7 to quickly exhaust and contract, thereby completing the seal release so that interface 5 can be easily pulled out from the grain silo vent.

[0038] Preferably, the control module may also be equipped with a human-machine interface, which may include, but is not limited to, buttons, indicator lights or touch screens, and supports manual / automatic mode switching, thereby improving the operational flexibility and on-site adaptability of the equipment.

[0039] Furthermore, the inflatable sealing device can also be equipped with a pressure transmitter 21 to monitor the pressure inside the inflatable sealing ring 7 in real time and feed the signal back to the control module. When the pressure is detected to be lower than the set lower limit, the control module automatically restarts the air pump 18 and the air inlet solenoid valve 19 to replenish the air, thereby achieving dynamic maintenance of the sealing pressure and ensuring the reliability of the connection during long-term ventilation operations.

[0040] In actual operation, after interface 5 is inserted into the grain silo vent, the control unit starts the air pump 18 and opens the air inlet solenoid valve 19 to inflate the air-sealing ring 7. As the pressure rises, the air-sealing ring 7 expands radially until its outer wall forms an interference fit with the inner wall of the grain silo vent, thereby achieving an airtight seal. When the pressure transmitter 21 detects that the pressure has reached the preset upper limit value, the control unit automatically shuts off the air pump 18 and the air inlet solenoid valve 19, thus completing the sealing connection.

[0041] During ventilation, the control module continuously monitors the pressure. If a minor leak causes the pressure to fall below the preset lower limit, the control unit will automatically restart the air replenishment process to maintain sealing reliability. After ventilation is completed, the control unit opens the exhaust solenoid valve 20, causing the inflatable sealing ring 7 to quickly depressurize and contract, facilitating the removal of the interface 5.

[0042] Specifically, the leveling device is located at the bottom of the fan body 1 to adjust the overall height and spatial posture of the fan body 1 to adapt to the ground slope or unevenness of the work site, and to ensure that the air outlet axis of the flexible air duct 4 is precisely aligned with the air outlet axis of the grain warehouse, thereby effectively compensating for axial, radial and angular installation deviations caused by terrain undulations, and preventing the flexible air duct 4 from being excessively bent, twisted or loosened due to eccentric force.

[0043] In this embodiment, the leveling device includes a lifting cylinder 11, an integrated pump station 10, and a tilt sensor.

[0044] The lifting cylinder 11, as an actuator, is mounted on the base frame of the fan body 1 to support the weight of the entire unit and adjust the vertical stroke of each support point, thereby achieving dynamic adjustment of the height and spatial posture of the fan body 1. Preferably, there are three lifting cylinders 11, evenly distributed along the circumference of the base frame of the fan body 1, which can be arranged in a triangular pattern to form a geometrically stable three-point support structure, thus ensuring structural rigidity during the leveling process.

[0045] The integrated pump station 10 is connected to each lifting cylinder 11 via hydraulic pipelines and is equipped with a multi-way directional valve or an electrically controlled proportional valve group. It can independently or collaboratively adjust the extension and retraction movements of each lifting cylinder 11 according to control commands issued by the control module, thereby achieving precise stroke control. The multi-way directional valve supports manual or electric switching to meet the operational needs of different working modes.

[0046] The tilt sensor is installed near the center of gravity of the wind turbine body 1 to collect its pitch and roll angle data in real time and transmit analog or digital signals to the control module. Based on the received attitude information and a preset leveling target (such as a horizontal state or a specified angle), the control module calculates the required extension / retraction amount for each lifting cylinder 11 and sends a drive command to the pump station 10, thereby driving each lifting cylinder 11 to move.

[0047] In practical applications, once the main body 1 of the fan is in place, the operator starts the automatic leveling program. The control module reads the initial value of the tilt sensor and controls the pump station 10 to drive each lifting cylinder 11 in sequence to gradually eliminate the tilt error until the main body 1 of the fan reaches the preset posture. After leveling is completed, the control module can automatically lock the hydraulic circuit to maintain the stable support state of the main body 1 of the fan, ensuring the safety and reliability of subsequent ventilation operations.

[0048] Furthermore, the output end of the lifting cylinder 11 is provided with a ball head 16, and a corresponding ball head flange 17 is provided on the base frame of the fan body 1. The ball head flange 17 and the ball head 16 form a spherical joint connection. This spherical joint connection structure allows relative rotation between the lifting cylinder 11 and the fan body 1 within a certain angle range, including pitch, tilt, and compound angular motion, thereby adapting to the attitude changes of the fan body 1 during leveling and avoiding local stress concentration or hydraulic cylinder eccentricity caused by rigid connection. Especially in the case of uneven ground or slight settlement of the foundation, the spherical joint can effectively absorb installation errors and dynamic deformation, thereby improving the flexibility and reliability of the support. In addition, this connection method can reliably transmit axial support force and reaction force while realizing multi-degree-of-freedom attitude adjustment, ensuring structural stability during leveling.

[0049] Preferably, the surface of the ball head 16 may be chrome-plated or coated with a wear-resistant coating, and the ball head flange 17 may be fitted with a self-lubricating bearing or a wear-resistant bushing to reduce frictional resistance, improve smoothness of movement and extend service life.

[0050] Specifically, the base frame of the blower body 1 is equipped with casters 13 and directional wheels 14 to enable flexible movement and accurate positioning of the blower body 1 at the work site. The casters 13 are omnidirectional wheels with rotating bases, capable of rotating freely around a vertical axis and offering 360° turning capability. They are positioned at the front end of the blower body 1 for easy turning operations. The directional wheels 14 are fixed rollers, installed in the same direction as the longitudinal axis of the blower body 1, and located at the rear end of the base frame to provide stable linear support and rolling guidance. Through the coordinated operation of the casters 13 and directional wheels 14, operators can easily propel the blower body 1 to perform various movement actions such as forward, backward, turning, and rotating in place, thereby significantly improving the mobility and operational efficiency of the equipment in narrow passages or complex terrain environments in grain depots.

[0051] Furthermore, both the omnidirectional wheel 13 and the directional wheel 14 are equipped with a wheel locking mechanism to fix the rolling freedom of the wheel and the steering freedom of the omnidirectional wheel after the fan body 1 is positioned. This prevents the equipment from slipping or displacing unexpectedly due to external disturbances, ground slope, hydraulic leveling reaction force, or air-filled sealing expansion force during subsequent leveling or ventilation operations, thereby ensuring the stability and operational safety of the entire machine.

[0052] In this embodiment, the locking mechanism is a foot-operated brake mechanism integrated inside the wheel frame. The operator can step on the lever on the wheel frame to drive the brake block to press against the wheel shaft, thereby locking the rolling freedom. For the omnidirectional wheel 13, the mechanism also acts on the rotating base, restricting its rotational movement around the vertical axis, so that the omnidirectional wheel switches from a free-turning state to a fixed-direction state, which is equivalent to the function of a directional wheel.

[0053] Since this type of foot-operated braking mechanism is widely used in industrial mobile equipment, its specific structure and working principle are common knowledge to those skilled in the art, therefore, this specification will not describe its internal structure in detail. However, it should be understood that the present invention is not limited to this specific locking form, and other locking methods that can achieve equivalent functions are also applicable, such as: manual rotary locks, push rod brakes, electric electromagnetic braking devices, or pneumatic braking systems, etc.

[0054] Preferably, each wheel is made of high-strength nylon or rubber-coated wheel, which has good wear resistance, shock absorption performance and ground adaptability, avoiding scratches or excessive noise on hard surfaces such as cement and steel plates.

[0055] Furthermore, a traction rod 12 is provided on the base frame of the fan body 1 to assist the operator in pushing or pulling the fan body 1 to move it on the work site. The traction rod 12 is located on the side of the flexible duct 4, preferably in a non-air outlet area on one side of the fan body 1, thereby avoiding interference with the retraction path of the flexible duct 4. A fixed seat is provided on the base frame of the fan body 1. The fixed seat has a waist-shaped groove along the vertical direction. The bottom end of the traction rod 12 has a connecting hole. A bolt passes through the waist-shaped groove and the connecting hole and is engaged with a nut to realize the rotatable connection between the traction rod 12 and the base frame. This connection method allows the traction rod 12 to rotate around the bolt axis within an angle range of 0° to 90°. When the traction rod 12 rotates upward to a vertical position of 90°, it enters the working position, making it easy for the operator to hold and push. When it rotates downward to a near-horizontal position of 0°–30°, it fits against the base frame to reduce the overall height, thereby facilitating transportation, storage, and forklift handling.

[0056] In this embodiment, a U-shaped groove is provided at the top of the fixed base. This U-shaped groove and the lower waist-shaped groove are located on the same axis, thus forming a through guide and limiting channel. The traction rod 12 is provided with a locking component, which can be an elastic buckle, a limiting boss, or a pin structure with spring return. When the traction rod 12 is in a perpendicular state to the base frame, the locking component engages with the U-shaped groove, thereby achieving axial limiting and circumferential fixing of the traction rod 12, preventing the traction rod 12 from accidentally folding due to vibration or external force during use, thus ensuring operational stability and safety. When the traction rod 12 needs to be used, the operator applies external force to gently lift the locking component upwards, causing it to disengage from the constraint of the U-shaped groove. Then, the traction rod 12 is rotated around the central axis of the bolt, causing it to enter an inclined state to facilitate the traction operation of the fan body 1.

[0057] Example 2: The present invention also provides an operating method for a quick-connect fan, applied to the quick-connect fan as described in Example 1. The method includes the following steps: S1: Move the main body of the fan 1 to the vicinity of the target grain warehouse by traction or manual pushing, and adjust its position so that the air outlet axis of the main body of the fan 1 is aligned with the center of the grain warehouse air outlet, ensuring that the connection path of the flexible air duct 4 is unobstructed.

[0058] S2: Start the integrated pump station 10 to drive the extension and retraction of multiple lifting cylinders 11; and combine the pitch angle and roll angle signals of the fan body 1 collected in real time by the tilt sensor, the control module calculates the required stroke of each lifting cylinder 11 and coordinates the adjustment of the height of each support point, so as to realize the automatic leveling of the attitude of the fan body 1, so as to ensure that the air outlet axis is coaxial with the grain silo air outlet axis.

[0059] S3: Release the connection between the limiting ring 6 and the air duct support 9 to release the flexible air duct 4; the operator holds the interface 5 and inserts it into the grain warehouse air vent until the end face of the interface 5 is in contact with the grain warehouse wall to complete the mechanical connection.

[0060] S4: Start the inflation sealing device. The control module turns on the air pump 18 and the air intake solenoid valve 19 to deliver compressed gas into the inflation sealing ring 7. The inflation sealing ring 7 expands under pressure, and its outer circumference forms an interference fit with the inner wall of the grain silo air vent, thereby achieving an airtight connection. When the pressure reaches the preset upper limit value, the air pump 18 and the air intake solenoid valve 19 are turned off, and then the pressure holding state is entered.

[0061] S5: Start the main body of the fan 1 for ventilation operation; during operation, the pressure transmitter 21 continuously monitors the internal pressure of the air-filled sealing ring 7 and feeds the signal back to the control module; when the pressure is detected to be lower than the preset lower limit (such as due to temperature changes or micro-leakage), the control module automatically restarts the air pump 18 to replenish air and maintain the sealing stability.

[0062] S6: After the ventilation operation is completed, the control module opens the exhaust solenoid valve 20, which causes the inflation sealing ring 7 to depressurize and contract rapidly; after the inflation sealing ring 7 is fully reset, the interface 5 is pulled out smoothly; then the flexible air duct 4 is neatly stored and re-fixed to the air duct bracket 9 through the limit ring 6, thus completing the entire operation process.

[0063] Many other changes and modifications can be made without departing from the concept and scope of this invention. It should be understood that this invention is not limited to the specific embodiments, and the scope of this invention is defined by the appended claims.

Claims

1. A quick-connect fan for ventilation in grain silos, characterized in that, Includes a fan body (1), a flexible air duct (4), a leveling device, an inflatable sealing ring (7), and an inflatable sealing device. The first end of the flexible air duct (4) is connected to the air outlet of the fan body (1), and the end is connected to an interface (5). The interface (5) is used to insert into the grain warehouse air outlet. The inflatable sealing ring (7) is fitted around the outer periphery of the interface (5). When inflated, its outer diameter expands and forms a sealed connection with the inner wall of the grain silo vent. The inflatable sealing device is connected to the inflatable sealing ring (7) through an air passage to supply air to the inflatable sealing ring (7) to make it expand, so as to achieve an airtight connection between the interface (5) and the grain warehouse vent. The leveling device is installed on the main body of the fan (1) to adjust the height and posture of the flexible air duct (4) to adapt to the ground slope, so that the air outlet axis is aligned with the grain warehouse air outlet axis, thereby compensating for the terrain height and angle deviation.

2. The quick-connect fan for grain warehouse ventilation according to claim 1, characterized in that, The inflatable sealing ring (7) is an annular elastic rubber bladder structure, which is sleeved on the outer periphery of the interface (5). When inflated, the inflatable sealing ring (7) expands radially, and its outer wall forms a sealed connection with the inner wall of the grain silo vent.

3. A quick-connect fan for grain warehouse ventilation according to claim 1, characterized in that, The inflatable sealing device includes an air pump (18), which is connected to the inflatable sealing ring (7) through an air passage to deliver gas to the inflatable sealing ring (7) to achieve expansion sealing; An intake solenoid valve (19) is located on the pipeline between the air pump (18) and the inflation sealing ring (7) to control the inflation on / off. The exhaust solenoid valve (20) has an inlet end connected to an inflation seal ring (7) and an outlet end connected to the outside, used to control pressure relief and exhaust.

4. A quick-connect fan for grain silo ventilation according to claim 3, characterized in that, The inflatable sealing device also includes a pressure transmitter (21), which is located in the air path of the inflatable sealing ring (7) to monitor its inflation pressure in real time.

5. A quick-connect fan for grain silo ventilation according to claim 1, characterized in that, The leveling device includes a lifting cylinder (11) and a pump station (10). The lifting cylinder (11) is located on the fan body (1) to support the fan body (1) and adjust its height. The pump station (10) is connected to the lifting cylinder (11) to realize the attitude adjustment of the fan body (1).

6. A quick-connect fan for grain silo ventilation according to claim 5, characterized in that, The lifting cylinder (11) is provided in multiple ways. The multiple lifting cylinders (11) are evenly distributed around the circumference of the fan body (1) and arranged around its periphery. Each lifting cylinder (11) is connected to the pump station (10) through a hydraulic branch.

7. A quick-connect fan for grain silo ventilation according to claim 5, characterized in that, The leveling device also includes a tilt sensor, which is installed on the fan body (1) to detect the tilt angle of the fan body (1) in real time so as to achieve alignment between the air outlet and the grain silo air outlet axis.

8. A quick-connect fan for grain silo ventilation according to claim 5, characterized in that, The output end of the lifting cylinder (11) is provided with a ball head (16), and the main body of the fan (1) is provided with a ball head flange (17) that cooperates with it. The ball head flange (17) and the ball head (16) form a spherical pair connection.

9. A quick-connect fan for grain warehouse ventilation according to claim 1, characterized in that, The fan body (1) is provided with a duct support (9), and the interface (5) is provided with a limiting ring (6) corresponding to the duct support (9). The limiting ring (6) is detachably connected to the interface (5) to limit the position of the flexible duct (4).

10. A method for operating a quick-connect fan, characterized in that, Including the quick-connect fan as described in any one of claims 1-9, the method includes the following steps: S1. Move the main body of the fan (1) to the vicinity of the target grain warehouse by traction or pushing, and adjust its orientation so that the air outlet of the main body of the fan (1) faces the air outlet of the grain warehouse. S2. Start the pump station (10), drive multiple lifting cylinders (11) to move, combine the real-time feedback of the wind turbine body (1) attitude signal from the tilt sensor, and coordinate the adjustment of the stroke of each lifting cylinder (11); S3. Remove the limit ring (6) and connect the interface (5) to the grain warehouse vent. S4. Start the air-filled sealing device and pump gas into the air-filled sealing ring (7) through the air pump (18) to make the air-filled sealing ring (7) expand and form a sealed connection with the inner wall of the grain warehouse air vent. S5. Start the main body of the fan (1) for ventilation. During operation, the pressure transmitter (13) continuously monitors the pressure inside the air-filled sealing ring (7). When the pressure is lower than the preset lower limit, start the air pump (18) to replenish the air. S6. After ventilation is completed, open the exhaust solenoid valve (20) to exhaust and depressurize the air-filled sealing ring (7). After the air-filled sealing ring (7) contracts, pull out the interface (5), put the flexible air duct (4) back into place on the air duct support (9), and complete the operation.

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