Outward opening type grain blocking door

Abstract

The invention relates to the technical field of grain blocking doors, and discloses an outward opening type grain blocking door which comprises a door frame, two symmetrically-arranged door bodies are hinged to the door frame, a handle shaft is rotationally installed on each door body, an inner shaft driven by the handle shaft is rotationally installed in each door body, and an outward extending driving assembly is installed on the end face of each door body. Two supporting wing plates are installed on the outward-extending driving assembly in a transmission mode, the two supporting wing plates are hinged through a hinge shaft, the included angle formed by the supporting wing plates and the door body after the supporting wing plates are unfolded ranges from 10 degrees to 30 degrees, the bottom face of each supporting wing plate is provided with a set of universal supporting wheels, the top face and the bottom face of the door body are each provided with a door closing self-locking mechanism, and a winding mechanism is installed on the door body. An operator only needs to rotate the handle, torque can be transmitted to the inner shaft through the bevel gear set, the supporting wing plates are driven to be synchronously unfolded to form 25-degree triangular supporting, 30%-40% of lateral loads are effectively shared, meanwhile, the door closing self-locking mechanism pushes the locking plate to be accurately embedded into the locking groove through the right-hand and left-hand threaded lead screw, and automatic locking after the door body is closed is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of grain retaining doors, and more specifically, to an outward-opening grain retaining door. Background Art

[0002] There are many technical problems in the practical application of traditional grain retaining doors:

[0003] 1. When facing the situation of storing a large amount of grain, the pressure-bearing capacity of the door body of the traditional grain retaining door is limited, and it is extremely easy to deform, which cannot effectively ensure the safety and stability of grain storage;

[0004] 2. After the traditional grain retaining door is closed, it needs to be manually locked. The operation process is cumbersome, and it is easy to occur the situation of not being locked firmly, resulting in grain leakage or entry of external pests, affecting the quality of grain;

[0005] 3. The traditional grain retaining door has a single function and cannot meet the diverse needs of sampling inspection, ventilation and heat dissipation, sealing, and large-scale grain discharging of grain, nor can it effectively solve the problem of grain quality decline caused by temperature changes. These problems seriously restrict the application and development of traditional grain retaining doors in the field of grain storage;

[0006] Based on this, the present invention provides an outward-opening grain retaining door to solve the technical problems mentioned in the above background art. Summary of the Invention

[0007] In order to overcome the deficiencies of the prior art, the present invention provides an outward-opening grain retaining door. In the present invention, the operator only needs to turn the handle, and the torque can be transmitted to the inner shaft through the bevel gear set to drive the support wing plates to expand synchronously to form a 25° triangular support, effectively sharing 30%-40% of the lateral load. At the same time, the door-closing self-locking mechanism pushes the locking plate to accurately embed into the locking groove through the left-right threaded screw rod to realize automatic locking after the door body is closed.

[0008] To achieve the above object, the present invention provides the following technical solutions: an outward-opening grain retaining door, including a door frame, on which two symmetrically arranged door bodies are hinged. A handle shaft is rotatably installed on the door body, and an inner shaft driven by the handle shaft is rotatably installed inside the door body. An outward-expansion driving assembly is installed on the end face of the door body, and two support wing plates are drivingly installed on the outward-expansion driving assembly. The two support wing plates are hinged through a hinge shaft. The included angle formed between the support wing plates and the door body after expansion is 10°-30°. A set of universal supporting wheels are installed on the bottom surfaces of the two support wing plates. Closed-door self-locking mechanisms are provided on the top and bottom surfaces of the door body. A winding mechanism is installed on the door body, and a grain retaining plate is wound on the winding mechanism. The grain retaining plate is respectively provided with a grain discharging area, a ventilation area, a sealing area, and an open area. A heat preservation bladder is installed on the back of the door body, and a sealing bladder is installed on the side of the door body. An air pressure boosting system for sending air into the inner cavities of the heat preservation bladder and the sealing bladder is provided on the top surface of the door frame. A closed-door reinforcement mechanism for reinforcing the door body is provided on the door frame.

[0009] As a preferred technical solution of the present invention, the closed-door self-locking mechanism includes a locking plate, a locking groove opened on the door frame and cooperating with the locking plate, and a first lead screw rotatably connected inside the door body. The locking plate is slidably connected to the door body through a slide rail. The first lead screw is driven by the inner shaft. A positive thread portion a and a reverse thread portion a are symmetrically arranged on the first lead screw. A transmission block is installed on each of the positive thread portion a and the reverse thread portion a through thread transmission. A support arm is hinged between each of the two transmission blocks and the locking plate.

[0010] As a preferred technical solution of the present invention, first bevel gears are installed on the tail ends of the first lead screw and the inner shaft, and the two first bevel gears mesh with each other. Second bevel gears are installed on the tail ends of the handle shaft and the inner shaft, and the two second bevel gears mesh with each other. A handle is installed on the handle shaft.

[0011] As a preferred technical solution of the present invention, the outward-expansion driving assembly includes two second lead screws rotatably installed on the door body. Third bevel gears are installed on the tail ends of the second lead screws and the inner shaft, and the two third bevel gears mesh with each other. A positive thread portion b and a reverse thread portion b are symmetrically arranged on the second lead screw. An extension plate is installed on each of the positive thread portion b and the reverse thread portion b through thread transmission. The two extension plates are respectively hinged to the two support wing plates through pin shafts.

[0012] As a preferred technical solution of the present invention, the winding mechanism includes two rollers rotatably connected to the door frame. The two ends of the grain retaining plate are respectively fixedly installed on the two rollers. Two motors are installed on the side surface of the door frame, and the output shaft ends of the two motors are respectively fixedly connected to the two rollers.

[0013] As a preferred technical solution of the present invention, a sampling port is provided on the grain discharging area, ventilation filter holes are evenly distributed on the ventilation area, a grain discharging opening is provided on the open area, the baffle is made of steel, the thickness of the baffle is 1.2 mm - 2.5 mm, the lengths of the grain discharging area, ventilation area, sealing area and open area are the same, and the length of the grain discharging area is 1.2 times the height of the door frame.

[0014] As a preferred technical solution of the present invention, the opening rate of the ventilation filter holes on the ventilation area is 35% - 50%, the ventilation filter holes are circular holes, the aperture of the ventilation filter holes is 1 mm - 2 mm, the ventilation filter holes are arranged in a honeycomb shape on the ventilation area, the length of the sampling port is 0.05 times - 0.1 times the length of the grain discharging area, the width of the sampling port is 0.05 times - 0.15 times the width of the door frame, the length of the grain discharging opening is the same as the height of the door frame, the width of the grain discharging opening is 0.6 times - 0.8 times the width of the door frame, and the outer edge of the grain discharging opening is coated with a wear-resistant rubber strip.

[0015] As a preferred technical solution of the present invention, the pneumatic boosting system includes an air pump installed on the top surface of the door frame, the air outlet port of the air pump is connected to a pump air pipe, a pressure probe is installed on the pump air pipe, the inner cavities of the heat preservation bladder and the sealing bladder are both connected to the pump air pipe, and the air inlet port of the air pump is connected to an air inlet valve.

[0016] As a preferred technical solution of the present invention, the door closing and reinforcement mechanism includes an inner fixing plate hinged to one side of the door frame and an outer fixing plate hinged to the other side of the door frame. Pneumatic linear actuators are hinged to both side surfaces of the door frame, and the other ends of the two pneumatic linear actuators are respectively hinged to the inner fixing plate and the outer fixing plate. The pneumatic linear actuator controls the internal pressure through an air pump, and the lengths of the outer fixing plate and the inner fixing plate are both 1.1 times - 1.2 times the width of the door body.

[0017] As a preferred technical solution of the present invention, the height of the support wing plate is 60% - 80% of the height of the door body, the width of the support wing plate is 15% - 25% of the width of the door body, the support wing plate is internally provided with honeycomb-shaped reinforcing ribs, and the support wing plate is made of high-strength steel.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. Through the mechanical limiting structure of bevel gear transmission and two-way lead screw linkage, this design realizes the labor-saving and self-locking precision of the door body operation. The operator only needs to turn the handle, and the torque can be transmitted to the inner shaft through the bevel gear set, driving the support wing plates to expand synchronously to form a 25° triangular support, effectively sharing 30%-40% of the lateral load. At the same time, the door-closing self-locking mechanism pushes the lock position plate to accurately embed into the lock groove through the positive and negative thread lead screw, realizing automatic locking after the door body is closed. This mechanical linkage system reduces the opening and closing operation force of the traditional grain baffle door by more than 60%, and avoids the defect of easy leakage of the traditional hydraulic system through the rigid transmission structure, ensuring the reliability and safety under high-frequency operation.

[0020] 2. This invention adopts the composite design of high-strength steel support wing plates and honeycomb reinforcing ribs, combined with a universal support wheel set to form a dynamic pressure-bearing system. The width of the expanded support wing plate reaches 20% of the door body, and it adapts to the terrain with polyurethane wheel surfaces, reducing the grain pressure borne by the door body from 0.8 MPa of the traditional structure to below 0.5 MPa. The mechanical limiting design of the self-lubricating bearing and limit block of the hinge shaft ensures that the support angle error ≤ 1°, preventing overload deformation. After testing, the deformation of the door body under the pressure of a 10m grain pile is < 2mm, and the anti-deformation ability is 3 times higher than that of the traditional structure. Moreover, the expansion and retraction life of the support wing plate reaches more than 100,000 times, significantly extending the service life of the equipment.

[0021] 3. The innovative four-section grain baffle and pneumatic sealing system of this invention realize multi-functional intelligent switching. The 2mm steel grain baffle quickly switches the grain discharging / ventilation / sealing modes through the winding mechanism. Among them, the honeycomb ventilation area has an opening rate of 45% and the pore diameter is accurately controlled, increasing the ventilation efficiency by 40%. After the pneumatic pressurization system drives the Ω-shaped sealing capsule to expand, the door gap sealing level reaches the IP67 standard. Combined with the pneumatic linear actuator of the door-closing reinforcement mechanism, a door body pressure-sealing-reinforcement control linkage system is formed. Tests show that this system can reduce the temperature control energy consumption in the warehouse by 25% and the grain mildew rate drops to below 0.3%, realizing the coordinated optimization of precise storage environment control and energy efficiency. Brief Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the outward-opening grain baffle door of this invention;

[0023] Figure 2 For this invention Figure 1 The partial enlarged structural schematic diagram at A in;

[0024] Figure 3 It is a schematic structural diagram of the air pump and grain baffle of this invention;

[0025] Figure 4 It is a schematic structural diagram of the grain baffle of this invention;

[0026] Figure 5Schematic diagram of the air pump and lock groove of the present invention;

[0027] Figure 6 Schematic diagram of the second lead screw and extension plate of the present invention;

[0028] Figure 7 Schematic diagram of the door body and sealing capsule of the present invention;

[0029] Figure 8 Schematic diagram of the inner shaft and handle shaft of the present invention;

[0030] Figure 9 Schematic diagram of the support arm and lock position plate of the present invention.

[0031] In the figure: 1, door frame; 2, door body; 3, handle shaft; 4, inner shaft; 5, support wing plate; 6, universal support wheel; 7, grain baffle; 8, sealing capsule; 9, heat preservation capsule; 10, lock position plate; 11, lock groove; 12, first lead screw; 13, transmission block; 14, support arm; 15, second lead screw; 16, extension plate; 17, roller; 18, motor; 19, air pump; 20, pump air pipe; 21, air pressure probe; 22, intake valve; 23, inner fixing plate; 24, outer fixing plate; 25, pneumatic linear actuator; 71, grain discharging area; 72, ventilation area; 73, sealing area; 74, open area; 75, grain discharging opening; 76, sampling port; 77, ventilation filter hole. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] As Figures 1 to 9 shown, the present invention provides an outward-opening grain baffle door, including a door frame 1, two symmetrically arranged door bodies 2 are hinged on the door frame 1, a handle shaft 3 is rotatably installed on the door body 2, and an inner shaft 4 driven by the handle shaft 3 is rotatably installed inside the door body 2;

[0034] Second bevel gears are installed at the tail ends of the handle shaft 3 and the inner shaft 4, the two second bevel gears are meshed with each other, and a handle is installed on the handle shaft 3;

[0035] When it is necessary to open or close the door body 2, the operator rotates the handle to drive the handle shaft 3 to rotate. Since the second bevel gears at the tail end of the handle shaft 3 and the inner shaft 4 are meshed with each other, the rotation of the handle shaft 3 is transmitted to the inner shaft 4, realizing the synchronous rotation of the inner shaft 4;

[0036] This design solves the technical problems of inconvenient and laborious operation in the traditional opening method of the grain retaining door. Through this gear transmission structure, the inner shaft 4 can be rotated with a smaller force, making the operation more labor-saving and improving work efficiency. At the same time, this mechanical limitation ensures a stable transmission relationship between the handle shaft 3 and the inner shaft 4, so that the transmission structure is not easily damaged during frequent operation, improving the reliability and service life of the equipment;

[0037] An outward expansion drive assembly is installed on the end face of the door body 2. Two support wing plates 5 are installed on the outward expansion drive assembly through transmission. The two support wing plates 5 are hinged through a hinge shaft. The included angle formed between the support wing plate 5 and the door body 2 after expansion is 25°;

[0038] The hinge shaft is a stepped shaft with a self-lubricating bearing. The end of the hinge shaft is fixed in the shaft seat of the door body 2 through a snap ring. A limit block is provided on the hinge shaft to limit the maximum included angle formed between the support wing plate 5 and the door body 2 after expansion;

[0039] The height of the support wing plate 5 is 70% of the height of the door body 2, the width of the support wing plate 5 is 20% of the width of the door body 2. Honeycomb-shaped reinforcing ribs are provided inside the support wing plate 5, and the support wing plate 5 is made of high-strength steel;

[0040] A set of universal supporting wheels 6 are installed on the bottom surfaces of the two support wing plates 5;

[0041] After the support wing plate 5 is expanded, it forms a stable triangular support, sharing 30%-40% of the lateral load of the door body 2;

[0042] The diameter of the universal supporting wheel 6 is 80 mm, with a polyurethane wheel surface, which can adapt to the ground unevenness and prevent excessive local pressure at the support point;

[0043] The outward expansion drive assembly includes two second lead screws 15 rotatably installed on the door body 2. A third bevel gear is installed at the tail end of each of the second lead screws 15 and on the inner shaft 4. The two third bevel gears mesh with each other. A positive thread part b and a reverse thread part b are symmetrically arranged on the second lead screw 15. A stretching plate 16 is installed on each of the positive thread part b and the reverse thread part b through thread transmission. The two stretching plates 16 are respectively hinged to the two support wing plates 5 through pin shafts;

[0044] When the inner shaft 4 rotates, the third bevel gear at its tail end drives the third bevel gear at the tail end of the second lead screw 15 to rotate, thereby causing the second lead screw 15 to rotate. Since the second lead screw 15 is provided with a positive thread portion b and a reverse thread portion b, the extension plate 16 threadedly connected thereto will move in opposite directions along the axial direction of the lead screw as the lead screw rotates, thereby pushing the support wing plate 5 to unfold or retract around the hinge axis. When the support wing plate 5 forms a 25° angle with the door body 2 after unfolding, it can effectively increase the support area and stability of the door body 2 for the grain, solving the technical problem that the door body 2 of the traditional grain retaining door is prone to deformation due to limited pressure when storing a large amount of grain. The support wing plate 5 is made of high-strength steel and is internally provided with honeycomb-shaped reinforcing ribs, which not only ensures its own strength, reduces the weight, but also further improves the support effect. At the same time, the universal support wheels 6 installed on the bottom surface of the support wing plate 5 facilitate flexible movement during the unfolding and retracting processes, reduce friction, and reduce wear on the door body 2 and the ground. This mechanical limitation ensures the coordinated operation of the components of the outward expansion drive assembly and accurately realizes the unfolding and retracting actions of the support wing plate 5;

[0045] The top and bottom surfaces of the door body 2 are both provided with door closing self-locking mechanisms;

[0046] The door closing self-locking mechanism includes a lock position plate 10, a lock groove 11 opened on the door frame 1 and cooperating with the lock position plate 10, and a first lead screw 12 rotatably connected inside the door body 2. The lock position plate 10 is slidably connected to the door body 2 through a slide rail, and the first lead screw 12 is driven by the inner shaft 4;

[0047] A first bevel gear is installed at the tail end of the first lead screw 12 and on the inner shaft 4, and the two first bevel gears mesh with each other;

[0048] Positive thread portions a and reverse thread portions a are symmetrically arranged on the first lead screw 12. A transmission block 13 is installed on each of the positive thread portion a and the reverse thread portion a through threaded transmission. A support arm 14 is hinged between the two transmission blocks 13 and the lock position plate 10;

[0049] When the inner shaft 4 rotates, the first lead screw 12 is driven to rotate through the meshing of the first bevel gears. Since the first lead screw 12 has positive thread portions a and reverse thread portions a, the transmission blocks 13 threadedly connected thereto will move in opposite directions along the axial direction of the lead screw, and the lock position plate 10 is pushed along the slide rail towards the lock groove 11 on the door frame 1 through the support arm 14 to realize the automatic locking of the door body 2. When the door needs to be opened, the inner shaft 4 is rotated in the reverse direction, and the lock position plate 10 will retract. This design solves the technical problem that the traditional grain retaining door needs to be manually locked after closing, with cumbersome operation and easy to be not locked firmly. The door closing self-locking mechanism realizes the automatic locking function, improves the operation convenience and safety, and at the same time ensures the sealing performance and stability of the door body 2 after closing;

[0050] In terms of mechanical limitation, through the cooperation among the lead screw, the transmission block 13, the support arm 14 and the locking plate 10, the movement of the locking plate 10 is precisely controlled to ensure its accurate entry into the locking groove 11, improving the reliability of the self-locking mechanism;

[0051] A winding mechanism is installed on the door body 2, and a grain baffle 7 is wound on the winding mechanism. The grain baffle 7 is respectively provided with a grain discharging area 71, a ventilation area 72, a sealing area 73 and an open area 74;

[0052] The winding mechanism includes two winding rollers 17 rotatably connected to the door frame 1. Both ends of the grain baffle 7 are fixedly installed on the two winding rollers 17. Two motors 18 are installed on the side surface of the door frame 1, and the output shaft ends of the two motors 18 are respectively fixedly connected to the two winding rollers 17.

[0053] A sampling port 76 is opened on the grain discharging area 71. Ventilation filter holes 77 are evenly distributed on the ventilation area 72. A grain discharging opening 75 is opened on the open area 74. The grain baffle 7 is made of steel, and the thickness of the grain baffle 7 is 2 mm. The lengths of the grain discharging area 71, the ventilation area 72, the sealing area 73 and the open area 74 are the same, and the length of the grain discharging area 71 is 1.2 times the height of the door frame 1;

[0054] The opening rate of the ventilation filter holes 77 on the ventilation area 72 is 45%. The ventilation filter holes 77 are circular holes, the aperture of the ventilation filter holes 77 is 1.5 mm, and the ventilation filter holes 77 are arranged in a honeycomb shape on the ventilation area 72;

[0055] The length of the sampling port 76 is 0.08 times the length of the grain discharging area 71. The width of the sampling port 76 is 0.1 times the width of the door frame 1. The length of the grain discharging opening 75 is the same as the height of the door frame 1. The width of the grain discharging opening 75 is 0.7 times the width of the door frame 1. The outer edge of the grain discharging opening 75 is coated with a wear-resistant rubber strip;

[0056] When it is necessary to switch the functional areas of the grain baffle 7, start the motor 18. The output shaft of the motor 18 drives the winding roller 17 to rotate, so as to realize the winding or unfolding of the grain baffle 7. The grain baffle 7 is provided with a grain discharging area 71, a ventilation area 72, a sealing area 73 and an open area 74, meeting different usage requirements and solving the technical problem of the single function of the traditional grain baffle door;

[0057] The sampling port 76 on the grain discharging area 71 is convenient for the staff to conduct sampling inspections on the grain;

[0058] The ventilation filter holes 77 evenly distributed on the ventilation area 72 are arranged in a honeycomb shape with an opening rate of 45% and an aperture of 1.5 mm, which can effectively ensure the ventilation and heat dissipation of the grain and prevent the grain from mildewing;

[0059] The sealing area 73 can ensure good sealing performance when needed;

[0060] The grain discharge opening 75 in the open area 74 facilitates a large amount of grain discharge;

[0061] The baffle 7 is made of steel material with a thickness of 2 mm, ensuring its strength and durability. The settings of the lengths of each functional area and the designs of the sampling port 76 and the size of the open area 74 have all been optimized, improving the practicability and operation convenience of the baffle 7. This mechanical limitation ensures that the winding mechanism can accurately control the position of the baffle 7 and achieve rapid switching between different functional areas;

[0062] A thermal insulation bladder 9 is installed on the back of the door body 2, and a sealing bladder 8 is installed on the side of the door body 2. An air pressure boosting system for supplying air into the inner cavities of the thermal insulation bladder 9 and the sealing bladder 8 is provided on the top surface of the door frame 1, and a door closing reinforcement mechanism for strengthening the door body 2 is provided on the door frame 1.

[0063] The air pressure boosting system includes an air pump 19 installed on the top surface of the door frame 1. The air outlet port of the air pump 19 is connected to a pump air pipe 20. A pressure probe 21 is installed on the pump air pipe 20. The inner cavities of the thermal insulation bladder 9 and the sealing bladder 8 are both connected to the pump air pipe 20. The air inlet port of the air pump 19 is connected to an air inlet valve 22.

[0064] The door closing reinforcement mechanism includes an inner fixing plate 23 hinged to one side of the door frame 1 and an outer fixing plate 24 hinged to the other side of the door frame 1. Pneumatic linear actuators 25 are hinged to both side surfaces of the door frame 1. The other ends of the two pneumatic linear actuators 25 are respectively hinged to the inner fixing plate 23 and the outer fixing plate 24. The pneumatic linear actuators 25 control the internal pressure through the air pump 19. The lengths of the outer fixing plate 24 and the inner fixing plate 23 are both 1.1 times - 1.2 times the width of the door body 2.

[0065] The thermal insulation bladder 9 is a three-layer composite structure: outer layer neoprene + aramid reinforcement layer + inner lining EPDM. The cross-section of the sealing bladder 8 is a Ω-shaped cavity, and the compression and rebound rate ≥ 90%;

[0066] The connection between the thermal insulation bladder 9 and the pump air pipe 20 is realized through a special flexible connecting pipe. One end of the connecting pipe is tightly sleeved on the branch outlet of the pump air pipe 20 and is double-fixed with a metal clamp to ensure tight sealing. The other end of the connecting pipe is docked with the air inlet interface reserved on the thermal insulation bladder 9. This interface is firmly combined with the main body of the thermal insulation bladder 9 by hot melt welding technology to ensure the strength and sealing performance of the connection. And inside the connecting pipe, a small airflow regulating valve that can be manually fine-tuned is installed to accurately control the gas flow entering the thermal insulation bladder 9 to adapt to different working environments and thermal insulation requirements. The sealing bladder 8 is installed on the side of the door body, and its connection with the pump air pipe 20 also relies on a flexible connecting pipe with good flexibility and wear resistance. One end of it is connected to the branch port of the pump air pipe 20 by a threaded connection method, and the other end is connected to the air inlet of the sealing bladder 8 through a special sealing joint provided with multiple rubber sealing washers. A pressure safety valve is also installed at the air inlet of the sealing bladder 8 to automatically relieve pressure when the air pressure exceeds the safety value to ensure the safety of the system;

[0067] In terms of the pressure control of the pneumatic linear actuator 25 by the air pump 19, the high-pressure gas output by the air pump 19 first enters the main air path distributor near the door frame. Two independent branch air paths are led out from the main air path distributor and are respectively connected to the pneumatic linear actuators 25 on both sides of the door frame. An electromagnetic directional valve, a throttle valve and a pressure sensor are sequentially installed on each branch air path. The electromagnetic directional valve is controlled by an external control system signal. When it is necessary to push the inner fixing plate 23 or the outer fixing plate 24 to rotate, the control system sends a signal to make its spool act to change the air path flow direction. For example, when pushing the inner fixing plate 23 to rotate inward to reinforce the door body, the control signal makes the corresponding electromagnetic directional valve energized, the spool switches positions, and the gas enters the rodless cavity of the pneumatic linear actuator 25 to push the piston rod to extend. When performing the reverse action, it is de-energized and reset.

[0068] After the door body 2 is closed, the air pump 19 is started. The air pump 19 sucks in air through the intake valve 22 and sends the air into the inner cavities of the heat preservation bladder 9 and the sealing bladder 8 through the pump air pipe 20. The air pressure probe 21 monitors the air pressure in real time to ensure the stability of the air pressure in the bladder. The heat preservation bladder 9 can effectively reduce the heat exchange between the grain in the bin and the external environment and keep the storage temperature of the grain stable, solving the problem of the decline in the quality of the grain caused by temperature changes; the sealing bladder 8 improves the sealing performance between the door body 2 and the door frame 1, preventing grain leakage and the entry of external pests. At the same time, the pneumatic linear actuators 25 on both sides of the door frame 1 are controlled by the air pump 19 to push the inner fixing plate 23 and the outer fixing plate 24 to rotate inward or outward;

[0069] The lengths of the inner fixing plate 23 and the outer fixing plate 24 are limited to 1.1 times the width of the door body 2, enabling them to effectively reinforce the door body 2 after the door body 2 is closed, solving the technical problem that the door body 2 is prone to deformation and damage when bearing a large grain pressure. This combination of mechanical limitation and pneumatic control not only ensures the heat preservation and sealing effects, but also improves the structural strength and stability of the door body 2 and extends the service life of the grain retaining door;

[0070] The working principle and usage process of the present invention:

[0071] When the outward-opening grain baffle door of the present invention is in operation, the operator rotates the handle on the handle shaft 3, and utilizes the second bevel gear meshing with each other at the tail end of the handle shaft 3 and the inner shaft 4 to drive the inner shaft 4 to rotate synchronously. When the inner shaft 4 rotates, the third bevel gear meshing with the tail end of the second lead screw 15 causes the second lead screw 15 to rotate. Since the second lead screw 15 is provided with a positive thread portion b and a reverse thread portion b, the expansion plate 16 threadedly connected thereto will move in opposite directions along the axial direction of the lead screw, pushing the support wing plate 5 to unfold or fold up around the hinge shaft. After unfolding, the support wing plate 5 forms an angle of 25° with the door body 2, sharing 30%-40% of the lateral load of the door body. At the same time, the rotation of the inner shaft 4 also drives the first lead screw 12 to rotate through the first bevel gear. The positive thread portion a and the reverse thread portion a on the first lead screw 12 cause the transmission block 13 to move in the reverse direction along the axial direction of the lead screw, and the locking plate 10 is pushed along the slide rail to slide into the locking groove 11 on the door frame 1 through the support arm 14, realizing automatic locking or unlocking of the door body 2. When it is necessary to switch the functional area of the grain baffle 7, the motor 18 is started, and its output shaft drives the winding roller 17 to rotate, realizing winding or unfolding of the grain baffle 7. After the door body 2 is closed, the air pump 19 is started, and air is sent to the heat preservation bladder 9 and the sealing bladder 8 through the pump air pipe 20. The heat preservation bladder 9 reduces heat exchange, and the sealing bladder 8 improves the sealing performance. At the same time, the air pump 19 controls the pneumatic linear actuator 25 to push the inner fixing plate 23 and the outer fixing plate 24 to rotate, strengthening the door body 2.

[0072] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0073] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Outward-opening grain retaining door, including a door frame (1), on which two symmetrically arranged door bodies (2) are hinged, characterized in that: A handle shaft (3) is rotatably installed on the door body (2). An inner shaft (4) driven by the handle shaft (3) is rotatably installed inside the door body (2). An outward expansion drive assembly is installed on the end face of the door body (2). Two support wing plates (5) are drivingly installed on the outward expansion drive assembly. The two support wing plates (5) are hinged by a hinge shaft. The included angle formed between the support wing plate (5) and the door body (2) after expansion is 10°-30°. A set of universal supporting wheels (6) are installed on the bottom surfaces of the two support wing plates (5). Closing self-locking mechanisms are provided on both the top and bottom surfaces of the door body (2). A winding mechanism is installed on the door body (2). A grain baffle (7) is wound on the winding mechanism. A grain discharging area (71), a ventilation area (72), a sealing area (73), and an open area (74) are respectively provided on the grain baffle (7). A heat preservation bladder (9) is installed on the back surface of the door body (2). A sealing bladder (8) is installed on the side surface of the door body (2). An air pressure boosting system for supplying air into the inner cavities of the heat preservation bladder (9) and the sealing bladder (8) is provided on the top surface of the door frame (1). A closing reinforcement mechanism for reinforcing the door body (2) is provided on the door frame (1).

2. The outward-opening grain retaining door according to claim 1, wherein: The closing self-locking mechanism includes a locking plate (10), a locking groove (11) opened on the door frame (1) and cooperating with the locking plate (10), and a first lead screw (12) rotatably connected inside the door body (2). The locking plate (10) is slidably connected to the door body (2) through a slide rail. The first lead screw (12) is driven by the inner shaft (4). A positive thread portion a and a reverse thread portion a are symmetrically arranged on the first lead screw (12). A transmission block (13) is installed on both the positive thread portion a and the reverse thread portion a through thread transmission. A support arm (14) is hinged between each of the two transmission blocks (13) and the locking plate (10).

3. The outward-opening grain baffle door according to claim 2, wherein: First bevel gears are installed on the tail ends of the first lead screw (12) and the inner shaft (4). The two first bevel gears mesh with each other. Second bevel gears are installed on the tail ends of the handle shaft (3) and the inner shaft (4). The two second bevel gears mesh with each other. A handle is installed on the handle shaft (3).

4. The outward-opening grain retaining door according to claim 3, characterized in that: The outward expansion drive assembly includes two second lead screws (15) rotatably installed on the door body (2). Third bevel gears are installed on the tail ends of the second lead screws (15) and the inner shaft (4). The two third bevel gears mesh with each other. A positive thread portion b and a reverse thread portion b are symmetrically arranged on the second lead screw (15). An extension plate (16) is installed on both the positive thread portion b and the reverse thread portion b through thread transmission. The two extension plates (16) are respectively hinged to the two support wing plates (5) through pin shafts.

5. The outward-opening grain retaining door according to claim 1, wherein: The winding mechanism includes two winding rollers (17) rotatably connected to the door frame (1). The two ends of the grain baffle (7) are respectively fixedly installed on the two winding rollers (17). Two motors (18) are installed on the side surface of the door frame (1). The output shaft ends of the two motors (18) are respectively fixedly connected to the two winding rollers (17).

6. The outward-opening grain retaining door according to claim 1, characterized in that: A sampling port (76) is provided on the grain discharging area (71), ventilation filter holes (77) are evenly distributed on the ventilation area (72), a grain discharging opening (75) is provided on the open area (74), the baffle plate (7) is made of steel, the thickness of the baffle plate (7) is 1.2 mm - 2.5 mm, the lengths of the grain discharging area (71), ventilation area (72), sealing area (73) and open area (74) are the same, and the length of the grain discharging area (71) is 1.2 times the height of the door frame (1).

7. The outward-opening grain retaining door according to claim 6, characterized in that: The opening rate of the ventilation filter holes (77) on the ventilation area (72) is 35% - 50%, the ventilation filter holes (77) are circular holes, the aperture of the ventilation filter holes (77) is 1 mm - 2 mm, the ventilation filter holes (77) are arranged in a honeycomb shape on the ventilation area (72), the length of the sampling port (76) is 0.05 times - 0.1 times the length of the grain discharging area (71), the width of the sampling port (76) is 0.05 times - 0.15 times the width of the door frame (1), the length of the grain discharging opening (75) is the same as the height of the door frame (1), the width of the grain discharging opening (75) is 0.6 times - 0.8 times the width of the door frame (1), and the outer edge of the grain discharging opening (75) is coated with a wear-resistant rubber strip.

8. The outward-opening grain retaining door according to claim 1, wherein: The pneumatic boosting system includes an air pump (19) installed on the top surface of the door frame (1), an air pump pipe (20) is connected to the air outlet port of the air pump (19), a pressure probe (21) is installed on the air pump pipe (20), the inner cavities of the heat preservation bladder (9) and the sealing bladder (8) are both connected to the air pump pipe (20), and an air inlet valve (22) is connected to the air inlet port of the air pump (19).

9. The outward-opening grain retaining door according to claim 8, characterized in that: The door closing and strengthening mechanism includes an inner fixing plate (23) hinged to one side of the door frame (1) and an outer fixing plate (24) hinged to the other side of the door frame (1). Pneumatic linear actuators (25) are hinged to both side surfaces of the door frame (1). The other ends of the two pneumatic linear actuators (25) are respectively hinged to the inner fixing plate (23) and the outer fixing plate (24). The pneumatic linear actuator (25) controls the internal pressure through the air pump (19). The lengths of the outer fixing plate (24) and the inner fixing plate (23) are 1.1 times - 1.2 times the width of the door body (2).

10. The outward-opening grain retaining door according to claim 1, characterized in that: The height of the support wing plate (5) is 60% - 80% of the height of the door body (2), the width of the support wing plate (5) is 15% - 25% of the width of the door body (2), honeycomb-shaped reinforcing ribs are arranged inside the support wing plate (5), and the support wing plate (5) is made of high-strength steel.

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