Grain drying device

Abstract

The utility model belongs to the technical field of agricultural equipment, and particularly relates to a grain drying device which comprises a drying box body, a hot air blower box is installed on one side of the bottom end of the drying box body, and an air inlet pipe of the hot air blower box penetrates through a vertical pipe portion of an exhaust pipe of an L-shaped box body. The hot air is fully contacted with the air inlet pipe before being exhausted, so that the heat energy is recycled; according to the structure, waste heat in hot air can be effectively recycled, the heat energy utilization rate is increased, the operation energy consumption of the device is reduced, and compared with a traditional grain drying device directly exhausting air, the device is more energy-saving and environment-friendly and meets the requirements of modern green agriculture for energy conservation and consumption reduction; the scraping ring is nested outside the air inlet pipe, and the bottom of the scraping ring is connected with the scraping rod, so that the function of removing dust attached to the outer surface of the air inlet pipe is realized; a detachable pipe bottom cover structure at the bottom of an exhaust pipe of the L-shaped box body is combined, so that the device can be quickly cleaned and maintained after running for a period of time, and the running stability and maintainability of the whole machine are improved.

Description

Technical Field

[0001] This utility model belongs to the field of agricultural equipment technology, specifically relating to a grain drying device. Background Technology

[0002] If grain is not dried promptly after harvest, it is highly susceptible to mold, sprouting, and other quality problems due to high moisture content, affecting its subsequent storage and processing. Therefore, grain drying, as a crucial step in grain post-processing, has wide applications in agricultural production. Currently, most common grain drying devices generate hot air using heated fans and deliver it to drying silos or boxes for hot air circulation drying. However, existing technologies have the following problems:

[0003] On the one hand, most drying devices discharge the hot air directly after use without recovering the heat energy it still carries, resulting in energy waste and low overall energy efficiency. On the other hand, some devices are designed in a way that makes it difficult to clean and maintain the hot air duct components, which can easily lead to duct blockage and affect the long-term stability and efficiency of the equipment. Utility Model Content

[0004] In view of the problems existing in the prior art, the purpose of this utility model is to provide a grain drying device that can effectively improve the efficiency of heat energy utilization and is easy to maintain.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A grain drying device includes a drying chamber body, a hot air blower box installed on one side of the bottom of the drying chamber body, an L-shaped exhaust pipe installed at the exhaust port of the top of the drying chamber body, an air inlet pipe installed at the air inlet of the hot air blower box, the air inlet pipe penetrating the vertical pipe of the L-shaped exhaust pipe, and the intersection between the air inlet pipe and the L-shaped exhaust pipe being used for heat energy recovery and utilization.

[0007] Furthermore, the bottom of the L-shaped exhaust pipe is fitted with a pipe bottom cover by threaded connection, and the pipe bottom cover is used for cleaning dust after being removed.

[0008] Furthermore, a scraper ring is nested on the outer side of the intake pipe, and an outer wall scraper rod is welded to the bottom side of the scraper ring. The bottom end of the outer wall scraper rod passes through the bottom cover of the pipe and is nested with a handle. The scraper ring is used to scrape off the dust accumulated on the surface of the intake pipe.

[0009] Furthermore, an air supply pipe is installed between the air inlet of the drying oven body and the air outlet of the hot air blower box, and the air supply pipe is used for delivering hot air.

[0010] Furthermore, a side pipe is provided on one side of the bottom of the L-shaped housing exhaust pipe.

[0011] Furthermore, a hoist is provided on one side of the drying chamber.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This invention achieves heat recovery and utilization by connecting the air inlet pipe of the hot air blower box to the vertical pipe of the L-shaped exhaust pipe, ensuring full contact between the air inlet pipe and the hot air before it is discharged. This structure can effectively recover waste heat from the hot air, improve the heat utilization rate, and reduce the energy consumption of the device. It is more energy-efficient and environmentally friendly than traditional grain drying devices that directly exhaust air, and meets the requirements of modern green agriculture for energy conservation and consumption reduction.

[0014] This invention removes dust from the outer surface of the intake pipe by nesting a scraper ring around the outside of the intake pipe, with a scraper rod connected to the bottom of the scraper ring. The scraper rod passes through the bottom cover of the pipe and is connected to a manually operable handle. Combined with the detachable bottom cover structure of the L-shaped exhaust pipe, it facilitates quick cleaning and maintenance after the device has been running for a period of time, effectively avoiding the problem of reduced heat exchange efficiency and air duct blockage caused by dust accumulation, and improving the stability and maintainability of the whole machine. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a partial cross-sectional view and a three-dimensional structural schematic diagram of the L-shaped box-type exhaust pipe of this utility model;

[0017] Figure 3 This is a three-dimensional structural diagram of the scraper bar on the outer wall of the pipe according to this utility model.

[0018] The attached diagram lists the components represented by each number as follows:

[0019] 101. Drying oven body; 111. L-shaped oven exhaust pipe; 112. Pipe bottom cover; 113. Side pipe; 102. Elevator; 103. Hot air blower box; 131. Air supply pipe; 104. Air inlet pipe; 105. Scraper bar on the outer wall of the pipe; 151. Scraper ring; 152. Handle. Detailed Implementation

[0020] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model. Example

[0021] like Figure 1 and Figure 2 As shown, a grain drying device includes a drying chamber body 101. The drying chamber body 101 is made of double-layer stainless steel plates, which have good sealing and heat preservation properties. The inner cavity is equipped with multiple layers of detachable perforated screen plates for layered distribution of grain and uniform heating. A hot air blower box 103 is installed on one side of the bottom of the drying chamber body 101. The hot air blower box 103 is a high-temperature resistant blower of model HF-G120, equipped with ceramic heating elements and aluminum alloy impellers, which have the characteristics of continuous heating and stable air pressure. An L-shaped exhaust pipe 111 is installed at the exhaust port of the top of the drying chamber body 101. The L-shaped exhaust pipe 111 is made of carbon steel and includes a horizontal section and a vertical section. The vertical section is equipped with porous baffles to improve the heat exchange efficiency between the exhaust hot air and other components. The air inlet of the hot air blower box 103 is equipped with an air inlet pipe 104, which is made of high thermal conductivity aluminum alloy and has a diameter of 50mm. It has excellent high temperature resistance. The air inlet pipe 104 passes through the vertical pipe of the L-shaped box exhaust pipe 111, so that the exhaust residual hot air can transfer heat when it comes into full contact with the air inlet pipe 104. The intersection between the air inlet pipe 104 and the L-shaped box exhaust pipe 111 is used for heat recovery and utilization, which effectively improves thermal efficiency and reduces energy consumption, realizes the secondary heating and circulation of hot air, and meets the development needs of green energy saving.

[0022] like Figure 2 As shown, the bottom of the L-shaped exhaust pipe 111 is fitted with a pipe bottom cover 112 by threaded connection. The pipe bottom cover 112 is made of 316 stainless steel, which has good corrosion resistance and heat resistance. The connection part is equipped with a silicone sealing ring to prevent gas leakage. The pipe bottom cover 112 can be removed for cleaning dust, making cleaning convenient and effectively preventing the hot air exhaust path from being blocked, which would cause insufficient air pressure or poor exhaust, thus enhancing the continuous operation stability of the device.

[0023] like Figure 2 and Figure 3As shown, a scraper ring 151 is nested on the outer side of the intake pipe 104. The scraper ring 151 is made of high-molecular polytetrafluoroethylene material, which has low friction and wear resistance. The nested structure ensures a tight fit with the outer wall of the intake pipe 104 to achieve the scraping effect. A pipe outer wall scraper rod 105 is welded to the bottom side of the scraper ring 151. The pipe outer wall scraper rod 105 is made of high-carbon steel solid structure with a diameter of 10mm. It is firmly connected to the scraper ring 151 by argon arc welding to ensure that it is not easy to break during long-term operation. The bottom end of the pipe outer wall scraper rod 105 passes through the pipe bottom cover 112 and is nested with a handle 152. The handle 152 adopts a PVC anti-slip rubber coating design, which makes it easy for the operator to manually rotate or move the scraper rod 105 up and down. The scraper ring 151 is used to scrape off the dust accumulated on the surface of the intake pipe 104, effectively preventing dust from accumulating during the heat exchange process and reducing the heat recovery efficiency, thereby improving the overall heat exchange quality.

[0024] like Figure 1 As shown, an air supply pipe 131 is installed between the air inlet of the drying chamber 101 and the air outlet of the hot air blower box 103. The air supply pipe 131 is made of high-temperature resistant composite silicone tubing with an inner diameter of 65mm. The outer surface is covered with insulation cotton material, and the inside is equipped with a metal spiral skeleton to enhance the strength of the pipe wall. The air supply pipe 131 is used to transport the high-temperature hot air generated by the hot air blower box 103 to the inside of the drying chamber 101, ensuring stable temperature and uniform wind speed during the hot air transport process, which is conducive to the grain being fully heated and dried quickly inside the chamber.

[0025] like Figure 1 As shown, a side pipe 113 is provided on one side of the bottom of the L-shaped box exhaust pipe 111. The side pipe 113 is made of stainless steel with a diameter of 30mm and has a guide baffle inside. It is used to guide part of the airflow to be discharged during the exhaust process or to connect to the auxiliary heat energy recovery device. It can also be used as a temporary exhaust channel during maintenance, which improves the flexibility and convenience of device maintenance.

[0026] like Figure 1 As shown, an elevator 102 is installed on one side of the drying chamber 101. The elevator 102 adopts a bucket elevator structure, model DTS-300, with a shell made of 304 stainless steel. It has a built-in chain drive system and a leak-proof sealed chamber. The lower end of the elevator 102 is equipped with a feed hopper to receive the grain transported by the belt conveyor, and the upper end is equipped with a discharge port corresponding to the top inlet of the drying chamber 101. The elevator 102 is used to stably and continuously transport the grain to be dried to the multi-layer screen plate inside the drying chamber 101, and achieve layered drying treatment in conjunction with the internal hot air flow.

[0027] Example 2: Grain drying device based on heat recovery structure

[0028] In this embodiment, the hot air blower box is model HF-G120, which uses ceramic heating elements as the heating source. The blower power is 2.2kW, and the outlet air temperature is controlled between 90℃ and 120℃. The blower box delivers high-temperature hot air to the bottom of the drying chamber through an air supply pipe with an inner diameter of 65mm. The hot air passes through the grain layer from bottom to top in the chamber and makes full contact with the grain. After drying, it is discharged from the top. The L-shaped exhaust pipe is made of Q235 carbon steel with a thickness of 3mm. Five radial baffles are installed in its vertical section to extend the hot air flow path. The air inlet pipe is an aluminum alloy pipe with an outer diameter of 50mm, which is horizontally inserted in the vertical section of the exhaust pipe and has a length of 600mm. The outer wall of the air inlet pipe exchanges heat with the hot exhaust gas in a high-efficiency manner, so that the air is preheated to above 45℃ before being drawn in by the blower, reducing heating energy consumption by about 15%.

[0029] Comparative Case: Traditional drying equipment does not have an exhaust heat recovery structure, and the hot air is directly discharged into the atmosphere after use, resulting in serious energy waste; Under the same operating cycle and environmental conditions, this embodiment improves energy saving by about 17% compared with the traditional solution, and effectively reduces equipment operating temperature fluctuations.

[0030] Example 3: Heat exchange intake system with clean structure

[0031] In this embodiment, the intake pipe is made of 6061-T6 aluminum alloy with anodized surface treatment to enhance oxidation resistance and heat dissipation. It is equipped with a PTFE scraper ring with a thickness of 4mm and an inner ring diameter that fits tightly with the intake pipe. A 10mm diameter solid carbon steel scraper bar is welded to the bottom, with a length of 550mm. The lower end passes through a 304 stainless steel pipe bottom cover and is locked to a PVC anti-slip handle with an M16 thread. The operator can periodically pull the scraper bar up and down to thoroughly remove dust adhering to the outer wall of the intake pipe. The pipe bottom cover is equipped with a silicone sealing ring and is fixed by screwing in the internal thread, making it easy to disassemble and assemble and improving the overall cleaning efficiency of the machine.

[0032] Comparative Case: Existing devices without scraper rings and scraper rods accumulate severe dust on the outer wall of the air intake pipe after 30 hours of continuous use, resulting in a decrease in heat exchange efficiency of approximately 22%, which necessitates increasing the heating power of the blower to maintain the temperature. In this embodiment, under the same operating conditions, the heat exchange efficiency remains stable, and the cleaning and maintenance cycle is extended by approximately 50%.

[0033] Example 4: Hot air drying system combining high-efficiency air supply system and layered drying structure

[0034] In this embodiment, the air supply pipe is made of high-temperature resistant composite silicone material with an embedded spiral steel wire reinforcing skeleton. It is 800mm long and has a 100mm thick rock wool insulation layer. The temperature drop of hot air transmission is controlled within 3℃. The drying chamber is equipped with 4 layers of detachable stainless steel perforated screen plates, with a spacing of 250mm between each layer. The DTS-300 bucket elevator is used to feed the grain in batches to ensure that the grain is evenly distributed in each layer. Hot air penetrates from the bottom to the top to achieve multi-layer drying. The hot air makes full contact with the material during the process of passing through the grain, which effectively improves the uniformity and speed of drying.

[0035] Comparative Case: In the comparative structure, no multi-layer sieves were set up, and the grain pile was dried by only a single layer of hot air circulation. In the experiment, the grain at the bottom of the pile was not dried enough, while the grain at the top was too dry. In this embodiment, the difference in moisture content of the grain in each layer does not exceed 1.2%, and the overall drying time is shortened by about 20%.

[0036] Example 5: Design of an exhaust system with scalable and flexible exhaust structure

[0037] In this embodiment, a 304 stainless steel side pipe with a diameter of 30mm and a wall thickness of 2mm is provided on one side of the bottom of the L-shaped housing exhaust pipe. The side pipe is 300mm long and has a connector with a quick-release buckle installed at the end, which can be flexibly connected to a dust removal device or an auxiliary waste heat recovery pipeline. It can also be used as a temporary exhaust path during maintenance. The side pipe has a built-in guide plate with a thickness of 2mm, which is used to adjust the flow angle and prevent backflow due to wind resistance. This design improves the functional compatibility of the system, making the equipment adaptable to different application scenarios.

[0038] Comparative Case: Traditional exhaust structures do not have side pipes or expansion ports and rely solely on a single main exhaust channel. In case of exhaust abnormalities or maintenance work, the entire machine must be shut down. This embodiment supports non-stop maintenance and energy recovery, significantly improving operating efficiency and system safety.

[0039] The working principle of this utility model is as follows:

[0040] When in use, the hot air blower box 103 is connected to the power supply, and the grain is transported to the hopper at the bottom of the elevator 102 by the belt conveyor. The elevator 102 transports the grain from the top of the drying box 101 to the inside of the drying box 101. The hot air blower box 103 delivers hot air to the bottom of the drying box 101 through the air supply pipe 131. Inside the drying box 101, the hot air is fully mixed and in contact with the grain to achieve the drying operation of the grain.

[0041] The hot air with residual heat is finally discharged from the L-shaped exhaust pipe 111 at the top of the drying chamber 101. At the vertical part of the L-shaped exhaust pipe 111, the hot air with residual heat comes into contact with the air inlet pipe 104 and transfers heat energy to the gas inside the air inlet pipe 104 through heat transfer.

[0042] The hot air blower box 103 delivers the heated air inside the air inlet pipe 104 to the bottom of the drying box body 101 through the air delivery pipe 131, realizing the recycling of heat energy, which is more energy-efficient and environmentally friendly, and also facilitates cleaning and maintenance of the L-shaped box exhaust pipe 111 and air inlet pipe 104.

[0043] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A grain drying device, comprising a drying chamber body (101), wherein a hot air blower box (103) is installed on one side of the bottom end of the drying chamber body (101), characterized in that: An L-shaped exhaust pipe (111) is installed at the top exhaust port of the drying box body (101), and an air inlet pipe (104) is installed at the air inlet of the hot air blower box (103). The pipe body of the air inlet pipe (104) passes through the vertical pipe body of the L-shaped exhaust pipe (111), and the intersection between the air inlet pipe (104) and the L-shaped exhaust pipe (111) is used for heat energy recovery and utilization.

2. The grain drying device according to claim 1, characterized in that: The bottom of the L-shaped exhaust pipe (111) is fitted with a pipe bottom cover (112) by threaded connection. The pipe bottom cover (112) is used for cleaning dust after being removed.

3. The grain drying device according to claim 2, characterized in that: The outer side of the air intake pipe (104) is fitted with a scraper ring (151), and the bottom side of the scraper ring (151) is welded with an outer wall scraper rod (105). The bottom end of the outer wall scraper rod (105) passes through the bottom cover (112) and is fitted with a handle (152). The scraper ring (151) is used to scrape off the dust accumulated on the surface of the air intake pipe (104).

4. The grain drying device according to claim 1, characterized in that: An air supply pipe (131) is installed between the air inlet of the drying oven body (101) and the air outlet of the hot air blower box (103), and the air supply pipe (131) is used for the delivery of hot air.

5. A grain drying device according to claim 1, characterized in that: A side pipe (113) is provided on one side of the bottom of the L-shaped box exhaust pipe (111).

6. A grain drying device according to claim 1, characterized in that: A hoist (102) is provided on one side of the drying box body (101).

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