Fuel gas dryer for drying forage grass

Abstract

The fuel gas dryer comprises a drying cylinder, the upper end of the drying cylinder is open, a feeding groove is formed in the side wall of the drying cylinder, a door plate is rotationally connected to the feeding groove, a handle is fixedly connected to the outer wall of the door plate, a rotating rod is rotationally connected into the drying cylinder, and the rotating rod is fixedly connected to the outer wall of the door plate. A plurality of sets of stirring plates are arranged on the circumference of the outer wall of the rotating rod, a plurality of sets of through holes are formed in the outer wall of each set of stirring plates in a penetrating mode, a heat energy recycling mechanism is installed in the drying cylinder, and a preheating cavity is formed in the drying cylinder. Through the components such as the flame nozzle and the stirring plate with the through holes which are arranged at the inclination angle of 45 degrees, the flame nozzle can prevent flames from directly burning the surface layer of forage grass, high-temperature damage of heat-sensitive nutritional ingredients is reduced, a turbulent flow field is formed when the stirring plate turns over the forage grass, and temperature dead corners in a forage grass pile are eliminated; the defects that an existing gas dryer is high in forage grass nutrient loss rate and large in forage grass water content difference after being dried are effectively overcome.

Description

Technical Field

[0001] This utility model relates to the field of drying technology, specifically a gas-fired dryer for drying forage. Background Technology

[0002] Forage drying is a crucial step in livestock farming to ensure feed quality and long-term storage. Gas-fired dryers are widely used due to their high heating efficiency and ease of operation.

[0003] However, in the existing technology, most forage dryers adopt fixed direct flame injection or static heat exchange structures, which lack efficient heat energy circulation and recovery mechanisms. For forage materials with different moisture contents and types, the equipment often cannot achieve flexible control. There is a lack of coordinated design between hot air temperature, flow rate and material stirring frequency, which can easily lead to surface burns or internal moisture residue in the forage. The heat generated during drying is also affected by the low heat utilization efficiency of existing gas-fired drying equipment. High-temperature flue gas is often directly discharged, resulting in a large amount of waste heat not being recovered and utilized, which not only wastes energy but also increases operating costs. Therefore, this utility model proposes a gas-fired dryer for forage drying to solve the above problems. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, such as excessive nutrient loss in forage, uneven drying, and waste of residual heat, this invention incorporates a 45° inclined flame nozzle, a stirring plate with through holes, and waste heat recovery components (heat-conducting pipes, pistons, etc.) to achieve uniform drying of forage, nutrient retention, and reuse of residual heat, thus avoiding the problems of nutrient loss, uneven drying, and energy waste associated with traditional equipment.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a gas-fired dryer for drying forage, comprising a drying cylinder with an open upper end, a feeding trough on the side wall of the drying cylinder, a door panel rotatably connected to the feeding trough, a handle fixedly connected to the outer wall of the door panel, a base frame fixedly connected to the lower end of the drying cylinder, an air inlet valve head on the side wall of the base frame, a gas plate fixedly connected inside the base frame, multiple sets of flame nozzles on the upper surface of the gas plate, and the air inlet valve head communicating with the gas plate, heat-conducting pipes installed at the open upper end of the drying cylinder in a parallel tube bundle arrangement, a rotating rod rotatably connected inside the drying cylinder, multiple sets of stirring plates circumferentially arranged on the outer wall of the rotating rod, each set of stirring plates having multiple through holes through its outer wall, a heat recovery mechanism installed inside the drying cylinder, and a preheating chamber provided inside the drying cylinder.

[0008] Preferably, the heat recovery mechanism includes a water tank disposed on one side of the drying cylinder, a device box fixedly connected to the outer wall of the drying cylinder, a connecting pipe 1 and a connecting pipe 2 installed on the outer wall of the device box, and a one-way valve installed inside each of the two connecting pipes, one end of the connecting pipe 1 and the connecting pipe 2 respectively connected to the heat-conducting pipe and the water tank, the other end of the heat-conducting pipe connected to the connecting pipe 3, and one end of the connecting pipe 3 connected to the inside of the water tank, and a piston movably connected inside the device box.

[0009] Preferably, a reciprocating lead screw is rotatably connected inside the device housing, and a lead screw sleeve is rotatably installed on the outer wall of the reciprocating lead screw. The lead screw sleeve is connected to the piston through a connecting rod.

[0010] Preferably, a limiting rod is fixedly connected to the inner wall of the device box, the lead screw sleeve is slidably connected to the outer wall of the limiting rod, and a limiting block is fixedly connected to the end of the reciprocating lead screw, with a radius larger than the radius of the reciprocating lead screw.

[0011] Preferably, the drying cylinder and the outer wall of the device box are respectively rotatably connected to a first transmission wheel and a second transmission wheel. The first transmission wheel is connected to the second transmission wheel via a transmission belt. The first transmission wheel and the second transmission wheel are respectively coaxially fixedly connected to the rotating rod and the reciprocating lead screw, and the radius of the first transmission wheel is larger than the radius of the second transmission wheel.

[0012] Preferably, a side plate is fixedly connected to the side wall of the drying cylinder, the outer wall of the side plate is L-shaped, a servo motor is fixedly connected to the outer wall of the side plate, and the output shaft of the servo motor is coaxially fixedly connected to the transmission wheel.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, this utility model provides a gas-fired dryer for drying forage, which has the following beneficial effects:

[0015] 1. This utility model uses components such as a flame nozzle set at a 45° angle and a stirring plate with through holes. The flame nozzle can avoid the flame directly burning the surface of the forage, reducing the high temperature damage to heat-sensitive nutrients. The stirring plate forms a turbulent field when turning the forage, eliminating the temperature dead zone inside the forage pile. This effectively solves the defects of existing gas-fired dryers, such as high loss rate of forage nutrients and large difference in moisture content of forage after drying.

[0016] 2. This utility model utilizes components such as parallel tube bundles of heat-conducting pipes, pistons and reciprocating screws in the device box, and a preheating chamber in the drying cylinder. The heat-conducting pipes and pistons work together to construct a waste heat recovery cycle, converting high-temperature waste heat into hot water for reuse. The preheating chamber can prevent the feed from being dry on the outside and wet on the inside. The synchronous pulley enables the mixing and heat exchange rhythm to be matched. The heat-resistant pipes and screw sleeves reduce losses. This effectively solves the defects of existing equipment, such as low energy utilization, long drying cycle, poor transmission coordination, and high component maintenance costs, thereby reducing equipment energy consumption and operating costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a gas-fired dryer for drying forage proposed in this utility model;

[0018] Figure 2 for Figure 1 Structural diagram;

[0019] Figure 3 for Figure 1 Schematic diagram of cross-section structure;

[0020] Figure 4 This is a cross-sectional structural diagram of the device box in section 1;

[0021] In the diagram: 1. Drying cylinder; 2. Feed trough; 3. Door panel; 4. Base frame; 5. Air inlet valve head; 6. Handle; 7. Side plate; 8. Servo motor; 9. Device box; 10. Heat conduction pipe; 11. Transmission wheel one; 12. Transmission wheel two; 13. Transmission belt; 14. Water bucket; 15. Connecting pipe one; 16. Connecting pipe two; 17. Connecting pipe three; 18. Rotating rod; 19. Stirring plate; 20. Gas plate; 21. Flame nozzle; 22. Limiting rod; 23. Limiting block; 24. Piston; 25. Lead screw sleeve; 26. Reciprocating lead screw. Detailed Implementation

[0022] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0023] This utility model provides a technical solution for a gas-fired dryer for drying forage:

[0024] Please see Figure 1-4 A gas-fired dryer for drying forage includes a drying cylinder 1 with an open upper end. A feeding trough 2 is provided on the side wall of the drying cylinder 1, and a door panel 3 is rotatably connected to the feeding trough 2. A handle 6 is fixedly connected to the outer wall of the door panel 3. A base frame 4 is fixedly connected to the lower end of the drying cylinder 1. An air inlet valve head 5 is provided on the side wall of the base frame 4. A gas plate 20 is fixedly connected inside the base frame 4. Multiple sets of flame nozzles 21 are provided on the upper surface of the gas plate 20, and the air inlet valve head 5 communicates with the gas plate 20. Heat-conducting pipes 10 are installed at the open upper end of the drying cylinder 1, arranged in a parallel tube bundle. A rotating rod 18 is rotatably connected inside the drying cylinder 1. Multiple sets of stirring plates 19 are arranged around the outer circumference of the rotating rod 18. Multiple sets of through holes are opened through the outer wall of each set of stirring plates 19. A heat recovery mechanism is installed inside the drying cylinder 1, and a preheating chamber is provided inside the drying cylinder 1.

[0025] Furthermore, the spacing between adjacent through holes on the stirring plate 19 is 5-8mm, which creates a turbulent field to enhance heat exchange when the forage is turned over; the flame nozzle 21 of the gas plate 20 is tilted at a 45° angle toward the bottom of the inner cavity of the drying cylinder 1 to avoid the flame directly burning the forage and causing nutrient loss.

[0026] The heat recovery mechanism includes a water tank 14 located on one side of the drying cylinder 1. A device box 9 is fixedly connected to the outer wall of the drying cylinder 1. A connecting pipe 15 and a connecting pipe 26 are installed on the outer wall of the device box 9, and a one-way valve is installed inside each of them. One end of the connecting pipe 15 and the connecting pipe 26 are respectively connected to the heat conduction pipe 10 and the water tank 14. The other end of the heat conduction pipe 10 is connected to the connecting pipe 37, and one end of the connecting pipe 317 is connected to the inside of the water tank 14. A piston 24 is movably connected inside the device box 9.

[0027] Furthermore, connecting pipe 15 and connecting pipe 2 16 are made of heat-resistant silicone tubing with a polytetrafluoroethylene coating on the inner wall to reduce heat loss caused by condensation of hot airflow.

[0028] A reciprocating lead screw 26 is rotatably connected inside the device box 9. A lead screw sleeve 25 is rotatably installed on the outer wall of the reciprocating lead screw 26. The lead screw sleeve 25 is connected to the piston 24 through a connecting rod.

[0029] Furthermore, the lead screw sleeve 25 is made of self-lubricating nylon material, with a bronze bushing embedded in the inner wall to reduce transmission friction loss.

[0030] A limiting rod 22 is fixedly connected to the inner wall of the device box 9. A lead screw sleeve 25 is slidably connected to the outer wall of the limiting rod 22. A limiting block 23 is fixedly connected to the end of the reciprocating lead screw 26, and its radius is larger than that of the reciprocating lead screw 26. A transmission wheel 11 and a transmission wheel 22 are rotatably connected to the outer wall of the drying cylinder 1 and the device box 9, respectively. The transmission wheel 11 is connected to the transmission wheel 22 through a transmission belt 13. The transmission wheel 11 and the transmission wheel 22 are coaxially fixedly connected to the rotating rod 18 and the reciprocating lead screw 26, respectively, and the radius of the transmission wheel 11 is larger than that of the transmission wheel 22.

[0031] Furthermore, transmission wheel 11 and transmission wheel 2 12 are synchronous pulleys, and transmission belt 13 is a neoprene synchronous belt. The radius ratio of transmission wheel 11 to transmission wheel 2 12 is 2:1, so that the rotation speed of the rotating rod 18 and the rotation speed of the reciprocating screw 26 form a 2:1 coordinated relationship, which is adapted to the forage mixing frequency and the airflow circulation rhythm of heat recovery.

[0032] A side plate 7 is fixedly connected to the side wall of the drying cylinder 1. The outer wall of the side plate 7 is L-shaped. A servo motor 8 is fixedly connected to the outer wall of the side plate 7. The output shaft of the servo motor 8 is coaxially fixedly connected to the transmission wheel 11.

[0033] In practical use, the working principle of this utility model is as follows:

[0034] When the operator uses the gas-fired dryer for drying forage, they open the door panel 3 via handle 6 and feed the forage to be dried into the drying cylinder 1 through the feed trough 2. The servo motor 8 is started, and its output shaft drives the transmission wheel 11 to rotate. This, in turn, drives the transmission wheel 12 to rotate synchronously via the transmission belt 13. The rotating rod 18 drives the stirring plate 19 to tumble the forage. The through holes on the outer wall of the stirring plate 19 create a turbulent flow field when the forage tumbles, enhancing the uniformity of heat exchange. The reciprocating screw 26 drives the piston 24 to reciprocate within the device box 9 via the screw sleeve 25. This, combined with the one-way valves of the connecting pipe 15 and the connecting pipe 16, establishes a heat recovery cycle.

[0035] After the flame is injected, it rapidly heats the air inside the drying cylinder 1, forming a high-temperature hot airflow that circulates within the cylinder. Because the flame nozzle 21 is tilted at a 45° angle towards the bottom of the cylinder, the hot airflow first acts on the forage at the bottom of the drying cylinder 1, and then gradually diffuses upwards, avoiding direct contact between localized high temperatures and the surface of the forage, effectively controlling the loss rate of nutrients in the forage. The heat-conducting pipes 10 at the open end of the drying cylinder 1 are arranged in a parallel tube bundle. When the high-temperature hot airflow flows through the outer wall of the heat-conducting pipes 10, it transfers some of the residual heat to the pipe body. At the same time, the reciprocating screw 26 rotates, driving the piston 24 to continuously reciprocate. When piston 24 moves away from the drying cylinder 1, a negative pressure is formed inside the device box 9. The one-way valve of connecting pipe 2 16 opens under the action of the negative pressure, and the water in water tank 14 is drawn into the device box 9 along connecting pipe 2 16. At this time, the heat conduction pipe 10 has accumulated a lot of residual heat through the transfer of high temperature hot air, and the inner wall of the device box 9 also maintains a certain temperature because it is close to the drying cylinder 1. The water entering the device box 9 comes into full contact with the box wall and the pipe section of heat conduction pipe 10 extending into the box, and quickly absorbs residual heat to achieve heating.

[0036] After the piston 24 moves to the extreme position away from the drying cylinder 1, as the reciprocating screw 26 continues to rotate, the screw sleeve 25 drives the piston 24 to move in the opposite direction closer to the drying cylinder 1. The internal space of the device box 9 is compressed and the pressure increases. The one-way valve of the second connecting pipe 16 automatically closes due to the pressure difference, while the one-way valve of the third connecting pipe 17 opens accordingly. The heated water flows back to the water tank 14 along the third connecting pipe 17 under pressure, completing one heat energy recovery cycle of pumping water, absorbing heat, and returning water.

[0037] As the drying process continues, the cycle repeats, and the water temperature in the water tank 14 gradually rises. When the water temperature reaches the set threshold, hot water can be introduced into the preheating chamber at the feed end of the drying drum 1 through an external pipe, according to processing needs, to preheat the newly added feed to be dried, reducing the initial moisture content of the feed and the energy consumption of subsequent gas drying. The hot water can also be used for cleaning the drying drum 1 after drying, dissolving the feed debris remaining on the inner wall of the drum, reducing cleaning difficulty, and realizing the tiered utilization of energy.

[0038] At the same time, the rotating rod 18 drives the stirring plate 19 to continuously rotate the forage. The through holes of the stirring plate 19 keep the forage in a dispersed state, ensuring that the high-temperature hot airflow in the drying cylinder 1 can penetrate the forage pile evenly, avoiding incomplete drying in some areas due to the accumulation of forage.

[0039] In summary, through the reciprocating motion of piston 24 and the coordinated control of the one-way valve, the water in water tank 14 continuously absorbs the waste heat during the drying process and achieves recycling. This not only solves the energy waste problem caused by the direct discharge of waste heat in traditional gas dryers, but also further reduces the overall energy consumption of the equipment through the secondary application of hot water. At the same time, the transmission coordination and structural design of each component ensure the uniformity of forage drying and the retention rate of nutrients, forming a complete and efficient working system of drying-waste heat recovery-energy reuse.

[0040] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A gas-fired dryer for drying forage, comprising a drying drum (1), characterized in that: The upper end of the drying cylinder (1) is open. A feeding groove (2) is provided on the side wall of the drying cylinder (1), and a door panel (3) is rotatably connected to the feeding groove (2). A handle (6) is fixedly connected to the outer wall of the door panel (3). A base frame (4) is fixedly connected to the lower end of the drying cylinder (1). An air inlet valve head (5) is provided on the side wall of the base frame (4). A gas plate (20) is fixedly connected inside the base frame (4). Multiple sets of flame nozzles (21) are provided on the upper surface of the gas plate (20). The air intake valve head (5) is connected to the gas plate (20). A heat conduction pipe (10) is installed at the upper open end of the drying cylinder (1), arranged in a parallel tube bundle. A rotating rod (18) is rotatably connected inside the drying cylinder (1). Multiple sets of stirring plates (19) are arranged around the outer wall of the rotating rod (18). Multiple sets of through holes are opened through the outer wall of each set of stirring plates (19). A heat recovery mechanism is installed inside the drying cylinder (1). A preheating chamber is provided inside the drying cylinder (1).

2. The gas-fired dryer for drying forage according to claim 1, characterized in that: The heat recovery mechanism includes a water tank (14) set on one side of the drying cylinder (1). A device box (9) is fixedly connected to the outer wall of the drying cylinder (1). A connecting pipe one (15) and a connecting pipe two (16) are installed on the outer wall of the device box (9), and a one-way valve is installed inside each of them. One end of the connecting pipe one (15) and the connecting pipe two (16) are respectively connected to the heat conduction pipe (10) and the water tank (14). The other end of the heat conduction pipe (10) is connected to the connecting pipe three (17), and one end of the connecting pipe three (17) is connected to the inside of the water tank (14). A piston (24) is movably connected inside the device box (9).

3. A gas-fired dryer for drying forage according to claim 2, characterized in that: A reciprocating lead screw (26) is rotatably connected inside the device box (9). A lead screw sleeve (25) is rotatably installed on the outer wall of the reciprocating lead screw (26). The lead screw sleeve (25) is connected to the piston (24) through a connecting rod.

4. A gas-fired dryer for drying forage according to claim 3, characterized in that: The inner wall of the device box (9) is fixedly connected to a limiting rod (22), the lead screw sleeve (25) is slidably connected to the outer wall of the limiting rod (22), and the end of the reciprocating lead screw (26) is fixedly connected to a limiting block (23), and the radius of the block is larger than that of the reciprocating lead screw (26).

5. A gas-fired dryer for drying forage according to claim 4, characterized in that: The drying cylinder (1) and the device box (9) are respectively rotatably connected to the outer walls of the drive wheel one (11) and the drive wheel two (12). The drive wheel one (11) is connected to the drive wheel two (12) through the drive belt (13). The drive wheel one (11) and the drive wheel two (12) are respectively coaxially fixedly connected to the rotating rod (18) and the reciprocating screw (26), and the radius of the drive wheel one (11) is larger than the radius of the drive wheel two (12).

6. A gas-fired dryer for drying forage according to claim 5, characterized in that: The drying cylinder (1) has a side plate (7) fixedly connected to its side wall. The outer wall of the side plate (7) is L-shaped. A servo motor (8) is fixedly connected to the outer wall of the side plate (7). The output shaft of the servo motor (8) is coaxially fixedly connected to the transmission wheel (11).

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