Hot air conveying device for grain drying

Abstract

The utility model belongs to the technical field of grain processing equipment, and particularly discloses a hot air conveying device for grain drying, which is used for solving the technical problems that unhulled rice is non-uniformly dried due to discontinuous air blowing in an unhulled rice drying process and energy is wasted due to the fact that waste heat cannot be utilized in a hot air drying process. The device comprises a cooling cylinder and a drying cylinder which are in smooth connection, a feeding cylinder is inserted into the cooling cylinder and the drying cylinder, an air outlet pipe is installed in the feeding cylinder, a cold air inlet pipe is installed at the lower end of the air outlet pipe, and a hot air inlet pipe penetrates through the lower middle portion of the air outlet pipe. The hot air inlet pipe penetrates through the cooling cylinder, extends to the outside and is connected with a hot air blast end; according to the unhulled rice drying device, hot air is blown from bottom to top, rapid drying of unhulled rice from top to bottom is achieved, the unhulled rice is heated evenly and comprehensively in the drying process, continuous non-intermittent drying of the unhulled rice is achieved, and waste heat utilization can be achieved through waste gas recovery.

Description

Technical Field

[0001] The utility model relates to the technical field of grain processing equipment, in particular to a hot air conveying device for grain drying. Background Art

[0002] Grain drying equipment is a machine and equipment that reduces the moisture content of grains. The purpose of drying is to prevent grains from deteriorating, ensure safe storage and meet processing requirements. The working principle of grain drying equipment is to use a drying medium to cause grains to release water vapor for drying. In the process of ventilation drying at room temperature, the drying medium is air with a relatively low relative humidity, which passes through the grains to take away the moisture on the surface of the grains to achieve the purpose of drying. The efficiency is low and the scope of application is limited. The hot air drying method used in the prior art is to pass hot air through the grains to take away the moisture to achieve drying, but there are the following problems in the drying process:

[0003] 1. During the rice drying process, discontinuous hot air blowing causes uneven drying of the rice; 2. The residual heat in the hot air drying process cannot be utilized, resulting in energy waste;

[0004] In view of the above technical defects, a solution is now proposed. Utility Model Content

[0005] The utility model aims to provide a hot air transmission device for grain drying, so as to solve the problems of uneven rice drying caused by discontinuous air blasting in the rice drying process and energy waste caused by the inability to utilize the residual heat in the hot air drying process.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a hot air conveying device for grain drying, comprising a cooling cylinder and a drying cylinder, the cooling cylinder and the drying cylinder are smoothly connected, the cooling cylinder and the drying cylinder are commonly plugged with a feed cylinder inside, an air outlet pipe is installed inside the feed cylinder, a cold air inlet pipe is installed at the lower end of the air outlet pipe, a hot air inlet pipe is passed through the middle and lower part of the air outlet pipe, the hot air inlet pipe passes through the cooling cylinder and extends to the outside and is connected with the hot air blowing end; a reversing cylinder 1 and a reversing cylinder 2 are commonly installed in the middle between the feed cylinder and the air outlet pipe, the reversing cylinder 1 and the reversing cylinder 2 are both hollow spiral-shaped and form a double helix structure, the air outlet pipe is provided with evenly distributed air outlets, the feed cylinder is provided with a discharge port corresponding to the air outlet, and the top side of the drying cylinder is provided with an exhaust gas outlet.

[0007] Preferably, the lower side between the feed barrel and the air outlet pipe is commonly installed with arranged and distributed baffles, the lower ends of the adjacent baffles on the upper side cover the upper ends of the baffles on the lower side, and the adjacent baffles have opposite inclination directions.

[0008] Preferably, the top of the feed cylinder extends to above the drying cylinder and is equipped with a feed pipe, the feed pipe is an inverted funnel-shaped, and an exhaust shield is arranged around the outside of the drying cylinder corresponding to the exhaust gas outlet, and the exhaust shield is connected to the suction end of the hot air blowing end.

[0009] Preferably, the reversing cylinder 1 and the reversing cylinder 2 are both provided with spiral holes, and the reversing cylinder 1 and the reversing cylinder 2 together form a circular ring structure, and the outer side of the circular ring structure contacts the inner wall of the feed cylinder and the inner side contacts the outer wall of the air outlet pipe.

[0010] Preferably, a symmetrically arranged discharge pipe is installed at the bottom of the cooling cylinder, a spiral feeding rod is provided inside the discharge pipe, the upper end of the discharge pipe is connected to both sides of the bottom of the feeding cylinder and the interiors are communicated, and the cold air inlet pipe is arranged between the discharge pipes.

[0011] Preferably, the gap between the feed barrel and the air outlet pipe is a guide gap, the lower section of the guide gap receives the cold airflow, the middle section of the guide gap receives the hot airflow, and the upper section of the guide gap is filled with exhaust gas.

[0012] The beneficial effects of the utility model are as follows:

[0013] (1) The utility model changes the falling surface in the guide gap by the impact of the baffle on the rice, that is, the rice changes from falling on one side to falling on the other side, and the hot air flow is discharged into the air outlet pipe and then discharged into the guide gap through the air outlet. The hot air flow entering the guide gap contacts the rice and then is discharged into the drying cylinder and the cooling cylinder below through the discharge port, so that the rice is fully contacted with the hot air flow. At the same time, the hot air flow discharged downward forms a recirculating air flow and enters the guide gap again through the discharge port, forming a secondary contact with the rice, thereby achieving the purpose of fully drying the rice. In addition, the rice is guided by the reversing cylinder 1 and the reversing cylinder 2, so that the rice falling on one side by its own weight is changed to the other side, thereby improving the uniformity of the rice drying process.

[0014] (2) By means of a spiral feeding rod arranged in the discharge pipe, the discharge speed can be adjusted according to the actual drying progress, and the continuous drying of the rice can be achieved by continuously injecting the rice into the guide gap from the feed pipe; by connecting the exhaust gas outlet on the exhaust shield with the air intake end of the hot air blast end, all the exhaust gas from the lower side of the drying cylinder and the inside of the cooling cylinder can be collected and recycled to the hot air blast end, so as to realize the recycling of heat source and fully reduce the loss of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings;

[0016] Figure 1 It is a structural stereogram of the entire utility model;

[0017] Figure 2 It is a cross-sectional structural schematic diagram of the utility model;

[0018] Figure 3 It is a schematic cutaway diagram of the internal structure of the utility model;

[0019] Figure 4 It is a cutaway schematic diagram of part of the internal structure of the utility model;

[0020] Figure 5 This is a schematic diagram of the installation and disassembly of the reversing mechanism of the utility model;

[0021] Figure 6 It is a wind direction flow schematic diagram of the utility model.

[0022] Legend: 1. Cooling cylinder; 2. Drying cylinder; 3. Feed cylinder; 4. Exhaust hood; 5. Hot air inlet pipe; 6. Discharge pipe; 7. Cold air inlet pipe; 8. Air outlet pipe; 9. Exhaust gas outlet; 10. Air outlet; 11. Baffle; 12. Discharge port; 13. Feed cylinder; 14. Reversing cylinder one; 15. Reversing cylinder two; 16. Spiral hole; 17. Guide gap. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Example:

[0025] This embodiment is used to solve the problem of uneven drying of rice caused by discontinuous air blowing during rice drying and energy waste caused by failure to utilize residual heat during hot air drying.

[0026] See also Figure 1 - Figure 6As shown, this embodiment is a hot air conveying device for grain drying, comprising a cooling cylinder 1 and a drying cylinder 2, wherein the cooling cylinder 1 is smoothly connected to the drying cylinder 2, and a feed cylinder 3 is commonly inserted into the interior of the cooling cylinder 1 and the drying cylinder 2, and an air outlet pipe 8 is installed inside the feed cylinder 3, and a cold air inlet pipe 7 is installed at the lower end of the air outlet pipe 8, and a hot air inlet pipe 5 is passed through the middle and lower part of the air outlet pipe 8, and the hot air inlet pipe 5 passes through the cooling cylinder 1 and extends to the outside and is connected to the hot air blast end; a reversing cylinder 14 and a reversing cylinder 2 15 are commonly installed in the middle between the feed cylinder 3 and the air outlet pipe 8, and the reversing cylinder 1 14 and the reversing cylinder 2 15 are both hollow spirals and form a double helix structure, and the air outlet pipe 8 is provided with evenly distributed air outlets 10, and the feed cylinder 3 is provided with a discharge port 12 corresponding to the air outlet 10, and an exhaust gas outlet 9 is provided on the top side of the drying cylinder 2;

[0027] The lower side between the feeding barrel 3 and the air outlet pipe 8 is commonly provided with arranged and distributed baffles 11, the lower ends of the adjacent baffles 11 on the upper side cover the upper ends of the baffles 11 on the lower side, and the adjacent baffles 11 have opposite inclination directions;

[0028] The reversing cylinder 14 and the reversing cylinder 2 15 are both provided with a spiral opening 16, and the reversing cylinder 14 and the reversing cylinder 2 15 together form a circular ring structure, and the outer side of the circular ring structure contacts the inner wall of the feeding cylinder 3 and the inner side contacts the outer wall of the air outlet pipe 8. A symmetrically arranged discharge pipe 6 is installed at the bottom of the cooling cylinder 1, and a spiral feeding rod is arranged inside the discharge pipe 6. The upper end of the discharge pipe 6 is connected to the two sides of the bottom of the feeding cylinder 3 and the insides are connected, and the cold air inlet pipe 7 is arranged between the discharge pipes 6;

[0029] The gap between the feed barrel 3 and the air outlet pipe 8 is a guide gap 17. The lower section of the guide gap 17 receives the cold air flow, the middle section of the guide gap 17 receives the hot air flow, and the upper section of the guide gap 17 is filled with waste gas, and the waste gas can be quickly absorbed by the suction end of the hot air blast end to complete the waste heat utilization;

[0030] See also Figure 1 — Figure 3As shown, in the drying process of rice processing, the device is used for hot air drying. First, the cold air inlet pipe 7 and the hot air inlet pipe 5 are connected to the cold air blast end and the hot air blast end respectively, and the rice is further discharged into the guide gap 17 through the feed pipe 13. Under the action of gravity, the rice flows down along the guide gap 17, and under the action of the arranged and distributed baffles 11, the rice is fully in contact with the hot air flow. Specifically, the rice is impacted by the baffle 11, and the falling surface in the guide gap 17 is changed. That is, the rice changes from falling from one side to the other side, and after the hot air flow is discharged into the air outlet pipe 8, it is discharged into the guide gap 17 through the air outlet 10. The hot air flow entering the guide gap 17 contacts the rice and then is discharged into the drying cylinder 2 and the cooling cylinder 1 below through the discharge port 12, so that the rice is fully contacted with the hot air flow. At the same time, the hot air flow discharged downward forms a recirculating air flow and enters the guide gap 17 again through the discharge port 12, forming a secondary contact with the rice, thereby achieving the purpose of fully drying the rice;

[0031] A reversing cylinder 14 and a reversing cylinder 2 15 with a double helix structure are also provided, the purpose of which is that the rice passing through the guide gap 17 is first guided by the reversing cylinder 14 and the reversing cylinder 2 15, completing the operation of changing the rice falling by its own weight on one side to the other side, thereby improving the uniformity of the rice drying process;

[0032] The spiral feeding rod arranged in the discharge pipe 6 can adjust the discharge speed according to the actual drying progress, and continuously dry the rice by injecting the rice into the guide gap 17 from the feed pipe 13;

[0033] The top of the feed cylinder 3 extends to the top of the drying cylinder 2 and is equipped with a feed pipe 13, which is in the shape of an inverted funnel. An exhaust hood 4 is arranged around the outside of the drying cylinder 2 corresponding to the exhaust gas outlet 9, and the exhaust hood 4 is connected to the suction end of the hot air blast end.

[0034] It is important to note here that by connecting the exhaust gas outlet 9 on the exhaust hood 4 to the air intake end of the hot air blast end, all the exhaust gas from the lower side of the drying cylinder 2 and inside the cooling cylinder 1 can be collected and recycled to the hot air blast end, thereby realizing the recycling of heat sources and fully reducing energy loss.

[0035] See also Figure 3 - Figure 6 As shown, the process and principle of the utility model are as follows:

[0036] Step 1: discharge the rice into the guide gap 17 through the feed pipe 13. Under the action of gravity, the rice flows downward along the guide gap 17, and under the action of the arranged and distributed baffles 11, the rice is fully in contact with the hot air flow. Specifically, the rice is impacted by the baffles 11, and the falling surface in the guide gap 17 is changed, that is, the rice changes from falling on one side to the other side. After the hot air flow is discharged into the air outlet 8, it is discharged into the guide gap 17 through the air outlet 10. The hot air flow entering the guide gap 17 contacts the rice and is then discharged into the drying cylinder 2 and the cooling cylinder 1 below through the discharge port 12, so that the rice is fully in contact with the hot air flow.

[0037] Step 2: The rice grains passing through the guide gap 17 are first guided by the reversing cylinder 14 and the reversing cylinder 2 15, so that the rice grains falling by their own weight on one side are changed to the other side, thereby improving the uniformity of the rice grain drying process;

[0038] Step 3: The spiral feeding rod arranged in the discharge pipe 6 can adjust the discharge speed according to the actual drying progress, and continuously inject rice into the guide gap 17 from the feed pipe 13 to achieve continuous drying of the rice, and all the exhaust gas from the lower side of the drying cylinder 2 and the inside of the cooling cylinder 1 is collected and recycled to the hot air blowing end to achieve the recovery and utilization of the heat source.

[0039] In summary: the hot air transmission device achieves rapid drying of rice from top to bottom by blowing hot air from bottom to top. During the drying process, the rice is heated evenly and comprehensively, achieving continuous and uninterrupted drying of the rice. It can also realize waste heat utilization through waste gas recovery, thereby reducing energy loss.

[0040] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A hot air conveying device for grain drying, comprising a cooling cylinder (1) and a drying cylinder (2), characterized in that: The cooling cylinder (1) is smoothly connected to the drying cylinder (2); a feed cylinder (3) is inserted into the interior of the cooling cylinder (1) and the drying cylinder (2); an air outlet pipe (8) is installed inside the feed cylinder (3); a cold air inlet pipe (7) is installed at the lower end of the air outlet pipe (8); a hot air inlet pipe (5) is passed through the middle and lower part of the air outlet pipe (8); the hot air inlet pipe (5) passes through the cooling cylinder (1) and extends to the outside to be connected to the hot air blowing end; the inlet A reversing cylinder 1 (14) and a reversing cylinder 2 (15) are installed in the middle between the material barrel (3) and the air outlet pipe (8). The reversing cylinder 1 (14) and the reversing cylinder 2 (15) are both hollow spiral-shaped and form a double spiral structure. The air outlet pipe (8) is provided with evenly distributed air outlets (10). The material inlet barrel (3) is provided with a discharge port (12) corresponding to the air outlet (10). The top side of the drying barrel (2) is provided with an exhaust gas outlet (9).

2. A hot air conveying device for grain drying according to claim 1, characterized in that: The lower side between the feed barrel (3) and the air outlet pipe (8) is commonly provided with arranged and distributed baffles (11), the lower end of the adjacent baffles (11) on the upper side covers the upper end of the baffles (11) on the lower side, and the adjacent baffles (11) have opposite inclination directions.

3. A hot air conveying device for grain drying according to claim 1, characterized in that: The top of the feed cylinder (3) extends to the top of the drying cylinder (2) and is equipped with a feed pipe (13), the feed pipe (13) is in the shape of an inverted funnel, and an exhaust hood (4) is arranged around the outside of the exhaust gas outlet (9) of the drying cylinder (2), and the exhaust hood (4) is connected to the air intake end of the hot air blowing end.

4. The hot air conveying device for grain drying according to claim 1, characterized in that: The reversing cylinder 1 (14) and the reversing cylinder 2 (15) are both provided with a spiral opening (16). The reversing cylinder 1 (14) and the reversing cylinder 2 (15) together form a circular ring structure, and the outer side of the circular ring structure contacts the inner wall of the feed cylinder (3) and the inner side contacts the outer wall of the air outlet pipe (8).

5. The hot air conveying device for grain drying according to claim 1, characterized in that: A symmetrically arranged discharge pipe (6) is installed at the bottom of the cooling cylinder (1), a spiral feeding rod is arranged inside the discharge pipe (6), the upper end of the discharge pipe (6) is connected to the two sides of the bottom of the feeding cylinder (3) and the interiors are connected, and the cold air inlet pipe (7) is arranged between the discharge pipes (6).

6. The hot air conveying device for grain drying according to claim 1, characterized in that: The gap between the feed barrel (3) and the air outlet pipe (8) is a guide gap (17), the lower section of the guide gap (17) receives a cold air flow, the middle section of the guide gap (17) receives a hot air flow, and the upper section of the guide gap (17) is filled with exhaust gas.

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