Heat source device of grain dryer

Abstract

The utility model belongs to the technical field of agricultural product drying equipment, and particularly relates to a heat source device of a grain dryer. One end of the shell is provided with a shell air inlet, the other end of the shell is provided with a shell air outlet, the shell air outlet is provided with an air blower connecting structure, an air duct piece is arranged in the shell, one end of the air duct piece is correspondingly connected with the shell air inlet, and the other end of the air duct piece is correspondingly connected with the shell air outlet; a plurality of heating plates which are arranged at intervals up and down are fixedly arranged in an inner cavity of the air duct piece through a mounting bracket, each heating plate is horizontally arranged, and the heating plates are microcrystalline glass plates coated with electrothermal films and conductive electrodes. According to the utility model, the heating efficiency can be effectively improved, and the use cost is saved.

Description

Technical Field

[0001] This utility model belongs to the technical field of agricultural product drying equipment, specifically relating to a heat source device for a grain dryer. Background Technology

[0002] Traditional grain drying relies on fixed facilities and sun-drying, which suffers from high energy consumption, site limitations, and poor timeliness, especially for small-scale farmers who are easily constrained by weather and costs. In recent years, small mobile dryers have emerged, with their core technology lying in modular mobile design and a high-efficiency thermal system: employing multi-fuel adaptability devices such as chemical fuels, electricity, or biomass, combined with metal structures (such as stainless steel or galvanized plates), they can be quickly transferred to fields or storage points via towing equipment. There are two main types of heat source devices: one uses methanol or natural gas for heating, where a burner uses methanol or natural gas as fuel, burning it in a specially designed combustion chamber to heat the outer shell. The outer shell is then encased in a metal cavity to form the dryer's air intake duct, heating the air to provide heat for the dryer; the other type uses electric heating tubes, with heat dissipation fins arranged in the dryer's air intake duct to heat the air to provide heat for the dryer. The heated air is sent to the drying chamber of the dryer by a blower. The hot air carries away the moisture from the grain and disperses it into the atmosphere, thus completing the drying process.

[0003] Among them, heat source dryers heated by methanol or natural gas not only suffer from problems such as large size, heavy weight, and high cost, but also have high failure rates and difficult maintenance due to their high equipment complexity. During operation, they also suffer from high fuel costs, low thermal efficiency (approximately 60%), and poor temperature control accuracy (±10℃), and are prone to risks such as burning grain and cross-contamination of flavors. Heat source dryers heated by electric heating tubes use high-power electric heating tubes, but these tubes have a small heating surface area, resulting in high heating power but also low heating efficiency and low heating air temperature, failing to meet drying requirements or requiring double the time and energy consumption. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a heat source device for a grain dryer, which can effectively improve heating efficiency and save on operating costs.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a heat source device for a grain dryer, including a shell, one end of which is provided with an air inlet and the other end with an air outlet, and the air outlet is provided with a blower connection structure. An air duct component is provided inside the shell, one end of which is connected to the air inlet and the other end of which is connected to the air outlet. Multiple heating plates are fixedly arranged vertically at intervals in the inner cavity of the air duct component by a mounting bracket. Each heating plate is horizontally arranged and is a microcrystalline glass plate coated with an electric heating film and conductive electrodes.

[0006] A further preferred embodiment is that the area where the conductive electrodes of the heating plate are located is provided with an electrical connection hole that penetrates the upper and lower surfaces of the heating plate. The electrical connection hole is connected to a copper lug by a stainless steel bolt, and the copper lug is used to connect the circuit wires.

[0007] A further preferred embodiment is that the conductive electrode of the heating plate is located at the end of the heating plate near the air inlet of the outer casing, and a wire groove bracket for routing circuit wires is fixedly installed on the outer end face of the air duct component near the air inlet of the outer casing.

[0008] A further preferred embodiment is: the inner cavity of the air duct component is fixedly provided with support members on both sides, and the upper surface of the support member and the inner cavity of the air duct component are combined to form a support slot, and the mounting bracket is snapped into the support slot.

[0009] A further preferred embodiment is as follows: the inner cavity of the duct component is provided with multiple sets of heating plates, each set containing two to five heating plates. Each set of heating plates is provided with a corresponding mounting bracket. Each mounting bracket includes a first side bracket, a second side bracket, a top bracket, a bottom bracket, and an elastic protective gasket. The first side bracket and the second side bracket are arranged opposite to each other. The first side bracket and the second side bracket are respectively provided with heating plate mounting slots on their respective sides. The two sides of the heating plate are respectively secured in the heating plate mounting slots by the elastic protective gaskets. The elastic protective gaskets have U-shaped slots that are adapted to the side ends of the heating plates. The top of the first side bracket and the top of the second side bracket are respectively fixedly connected to the top bracket by bolt connection structure. The bottom of the first side bracket and the bottom of the second side bracket are respectively fixedly connected to the bottom bracket by bolt connection structure.

[0010] A further preferred embodiment is that each heating plate is equipped with at least one temperature sensor. The temperature sensor is fixedly mounted on the first or second side bracket via a threaded connection structure. One end of the temperature sensor is a temperature measuring end, and the other end is a wire connection end. The temperature measuring end extends into the interval area between the first and second side brackets, and the wire connection end is correspondingly located on the outside of the first or second side bracket. The outside of the first and second side brackets refers to the side away from each other.

[0011] A further preferred embodiment is: an electrical control box is fixedly installed on the outside of the casing, and the electrical control box contains at least a control board and a three-phase voltage regulating module. The heating plate, temperature sensor, and three-phase voltage regulating module are all electrically connected to the control board.

[0012] A further preferred embodiment is as follows: the ductwork includes a rectangular box, a transition connecting pipe, and a cylindrical inner cylinder arranged sequentially. The inner cavity cross-section of the transition connecting pipe near the rectangular box is consistent with the inner cavity cross-section of the rectangular box, and the inner cavity cross-section of the transition connecting pipe near the cylindrical inner cylinder is consistent with the inner cavity cross-section of the cylindrical inner cylinder. The outer shell includes a rectangular outer shell and a cylindrical outer cylinder disposed at one end of the rectangular outer shell. The outer port of the cylindrical outer cylinder is the air outlet of the outer shell. The end of the cylindrical inner cylinder away from the transition connecting pipe is coaxially disposed within the cylindrical outer cylinder. The rectangular box and the transition connecting pipe are both disposed within the rectangular outer shell, and the heating plate is disposed within the rectangular box.

[0013] A further preferred embodiment is as follows: a fixed end plate is fixedly installed on the outer end face of the air inlet of the housing, which can completely block the flow channel of the air inlet of the housing. The fixed end plate is provided with a plurality of first air inlets. A movable end plate that can reciprocate horizontally is provided on the outer end face of the fixed end plate via a slide rail. One side of the movable end plate is in contact with the outer end face of the fixed end plate. The movable end plate is provided with a plurality of second air inlets that correspond one-to-one with the first air inlets. The movable end plate is equipped with a drive mechanism that drives it to move along the slide rail. By moving the movable end plate along the slide rail, the first air inlets and the second air inlets can switch between an aligned state and a misaligned state.

[0014] A further preferred embodiment is: the drive mechanism includes a nut, a control handwheel, and a through-type stepper motor with a rotating lead screw. The through-type stepper motor is fixedly mounted on the fixed end plate, and the nut is fixedly mounted on the movable end plate. The rotating lead screw and the nut cooperate to form a lead screw and nut mechanism. One end of the lead screw is fixedly connected to the control handwheel. Both ends of the slide rail are equipped with travel limiters for controlling the movement of the movable end plate.

[0015] Compared with existing technologies, the beneficial effects of this invention are as follows: The heating plate uses a microcrystalline glass plate coated with an electrothermal film and conductive electrodes, achieving a heat conversion rate of over 92%. Furthermore, the heating plate employs a multi-layered distribution with alternating vertical layers, providing a larger heating area to directly heat the airflow and obtain the hot air required by the drying equipment. Simultaneously, it significantly shortens the heating channel length, resulting in faster heating of the airflow within the duct and improved heating efficiency. Compared to traditional electric heating tubes, it can save over 30% in energy and has a longer service life. For the same drying capacity, it offers lower operating costs and better drying results. This heating plate also possesses excellent resistive characteristics, effectively reducing the impact on the power grid during start-up and shutdown control. Attached Figure Description

[0016] Figure 1 This is an exploded structural diagram of the present invention (only the heating plate of one heating channel is shown);

[0017] Figure 2This is a three-dimensional structural diagram of the assembled present invention.

[0018] Figure 3 for Figure 2 A three-dimensional structural schematic diagram of the embodiment shown from another angle;

[0019] Figure 4 for Figure 2 Top view of the embodiment shown;

[0020] Figure 5 for Figure 4 BB view;

[0021] Figure 6 This is a three-dimensional structural diagram of the outer shell of this utility model;

[0022] Figure 7 This is a three-dimensional structural diagram of the air duct component of this utility model (with a wire groove bracket fixedly installed);

[0023] Figure 8 yes Figure 7 The illustrated embodiment is shown in cross-sectional view in the frontal view.

[0024] Figure 9 This is a three-dimensional structural diagram of the air duct component of this utility model after the heating plate is installed (only the heating plate in one of the heating channels is shown);

[0025] Figure 10 for Figure 9 A partial enlarged view of the heating plate mounting area in the illustrated embodiment;

[0026] Figure 11 This is a three-dimensional structural diagram of a mounting bracket and a set of heating plates assembled according to this utility model.

[0027] Figure 12 for Figure 11 Top view of the embodiment shown;

[0028] Figure 13 for Figure 12 CC view;

[0029] Figure 14 for Figure 11 A partial front view of the embodiment shown;

[0030] Figure 15 for Figure 14 DD view;

[0031] Figure 16 This is a three-dimensional structural diagram of the fixed end plate and the movable end plate of this utility model after assembly;

[0032] Figure 17 for Figure 16 A partial front view of the embodiment shown;

[0033] Figure 18 for Figure 17 EE view;

[0034] Figure 19 for Figure 18 A magnified view of the right-hand area.

[0035] Component markings in the diagram: Outer shell 10, Outer shell air inlet 11, Outer shell air outlet 12, Rectangular outer shell 13, Cylindrical outer cylinder 14, Air duct component 20, Support component 21, Rectangular box 22, Transition connecting pipe 23, Cylindrical inner cylinder 24, Vertical partition 25, Mounting bracket 30, First side bracket 31, Second side bracket 32, Top bracket 33, Bottom bracket 34, Elastic protective pad 35, Temperature sensor 36, Heating plate 40, Electrical connection hole 41, Cable tray bracket 50, Cable tray bracket fixed mounting plate 51, Electrical control box 60, Fixed end plate 70, Slide rail 71, Movable end plate 72, Travel limit component 73, Rotary lead screw 81, Nut 82, Control handwheel 83, Through-type stepper motor 84. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] Please see Figures 1 to 19This utility model includes a housing 10, with an air inlet 11 at one end and an air outlet 12 at the other end. The air outlet 12 is equipped with a blower connection structure (a conventional connection structure, usually using a flange and bolts to connect to the blower air inlet). An air duct component 20 is provided inside the housing 10, with one end connected to the air inlet 11 and the other end connected to the air outlet 12 (as long as the room temperature airflow introduced through the air inlet 11 enters the inner cavity of the air duct component 20 for heating, and then the heated airflow enters the blower from the air outlet 12). Multiple heating plates 40 are fixedly arranged vertically at intervals in the inner cavity of the air duct component 20 by a mounting bracket 30. Each heating plate 40 is horizontally arranged and is a microcrystalline glass plate coated with an electric heating film and conductive electrodes. The single heating plate 40 is a conventional technology, as can be found in Chinese patent document CN214856101U. However, it is mainly used as a single unit in the field of cooking appliances. This utility model uses multiple heating plates stacked in layers for use in drying equipment. This not only makes full use of the heat conversion rate of the heating plate, but also allows for a larger heating area to directly heat the airflow to obtain the hot air required by the drying equipment. At the same time, it greatly shortens the length of the heating channel, heats the airflow in the duct quickly, and improves the heating efficiency. Compared with traditional electric heating tubes, it can save more than 30% of energy and has a longer service life. Under the same drying capacity, the operating cost is lower and the drying effect is better.

[0038] To facilitate connection, this utility model also improves the connection structure between the heating plate 40 and the circuit wires. In a preferred embodiment, an electrical connection hole 41 is provided in the area where the conductive electrode of the heating plate 40 is located, penetrating the upper and lower surfaces of the heating plate 40. The electrical connection hole 41 is connected to a copper lug by a stainless steel bolt (that is, the stainless steel bolt passes through the electrical connection hole 41 penetrating the heating plate 40 and the connection hole on the copper lug at the same time, and connects and fixes the heating plate 40 and the copper lug). The copper lug is used to connect the circuit wires.

[0039] To further facilitate wiring, in some preferred embodiments, the conductive electrodes of the heating plate 40 are positioned at the end of the heating plate 40 near the air inlet 11 of the outer casing, and a wire trough bracket 50 for wiring is fixedly provided on the outer end face of the duct component 20 near the air inlet 11 of the outer casing. One or more wire trough brackets 50 can be arranged according to actual needs. In the preferred embodiment shown in the accompanying drawings, two parallel heating channels are arranged inside the duct component 20 via a vertical partition 25, and two corresponding wire trough brackets 50 are also provided, one located on the outer end face of the duct component 20 near the electrical control box 60, and the other located on the end face of the vertical partition 25.

[0040] To facilitate processing and assembly, in some preferred embodiments, the present invention provides support members 21 fixedly installed on both sides of the inner cavity of the air duct component 20. The upper surface of the support member 21 and the two sides of the inner cavity of the air duct component 20 combine to form a support groove, into which the mounting bracket 30 is snapped. During assembly, the mounting bracket 30 and the heating plate 40 are pre-assembled into a whole, and then the mounting bracket 30 and the heating plate 40 are placed together in the support groove. The upper surface of the support member 21 provides support, while the two sides of the inner cavity of the air duct component 20 provide positioning and limiting functions.

[0041] To facilitate processing and assembly, in some preferred embodiments, the present invention provides multiple sets of heating plates 40 in the inner cavity of the air duct component 20. Each set of heating plates 40 consists of two to five pieces, and each set of heating plates 40 is provided with a corresponding mounting bracket 30. Each mounting bracket 30 includes a first side bracket 31, a second side bracket 32, a top bracket 33, a bottom bracket 34, and an elastic protective pad 35. The first side bracket 31 and the second side bracket 32 ​​are arranged opposite to each other. The sides of the first side bracket 31 and the second side bracket 32 ​​are respectively provided with heating plate mounting grooves. The two sides of the heating plate 40 are respectively secured in the heating plate mounting grooves by the elastic protective pads 35. The elastic protective pads 35 have U-shaped grooves that are adapted to the side ends of the heating plate 40. The top of the first side bracket 31 and the top of the second side bracket 32 ​​are respectively fixedly connected to the top bracket 33 by bolt connection structure, and the bottom of the first side bracket 31 and the bottom of the second side bracket 32 ​​are respectively fixedly connected to the bottom bracket 34 by bolt connection structure. In the preferred embodiment shown in the accompanying drawings of this utility model, each group of heating plates 40 consists of three pieces. Depending on actual needs, the total number of heating plates 40 can be designed to be 9, 12, 18, 24, 27, etc. Depending on the total number, the heating plates 40 can be arranged in multiple rows, with one row corresponding to each heating channel. In the preferred embodiment shown in the accompanying drawings of this utility model, the total number of heating plates 40 is designed to be 24 pieces, with 12 pieces arranged in each heating channel. The first side support 31, the second side support 32, the top support 33, and the bottom support 34 can be metal supports that meet the support strength requirements, preferably made of stainless steel. The elastic protective pad 35 is preferably made of an elastic material with cushioning and protective properties, its purpose being to avoid direct contact between the heating plate 40 and the metal support, reducing the risk of damage; it is preferably made of silicone. The elastic protective pad 35 on one side of the heating plate 40 can be designed as a single piece, or multiple pieces can be spaced apart. In the preferred embodiment shown in the accompanying drawings of this utility model, two elastic protective pads 35 are provided on each side of the heating plate 40, and four elastic protective pads 35 are provided on each heating plate 40.

[0042] To facilitate real-time monitoring of heating process parameters, it is generally preferred to arrange temperature sensors 36 within the heating duct. Taking into account both the convenience of installation and wiring and the accuracy of temperature detection parameters, this utility model preferably equips each heating plate 40 with at least one temperature sensor 36. The temperature sensor 36 can directly detect the hot air temperature of its corresponding area. The temperature sensor 36 is fixedly mounted on the first side bracket 31 or the second side bracket 32 ​​via a threaded connection structure (i.e., the housing of the temperature sensor 36 has external threads, and the first side bracket 31 or the second side bracket 32 ​​has matching internal threaded holes). One end of the temperature sensor 36 is a temperature measuring end, and the other end is a wire connection end. Its temperature measuring end extends into the interval area between the first side bracket 31 and the second side bracket 32, and the wire connection end is correspondingly located on the outside of the first side bracket 31 or the outside of the second side bracket 32. The outside of the first side bracket 31 and the outside of the second side bracket 32 ​​refer to the sides that are farthest from each other. The wire of temperature sensor 36 can be led to the wire groove bracket 50 on the outer end face of the air duct component 20 through the outer space of the first side bracket 31 and the outer space of the second side bracket 32, and finally to the electrical control box 60 through the wire hole on the side wall of the outer shell 10. In this scheme, the temperature sensor 36 is preferably linked to the working power of the heating plate 40 for control. Specifically, the electrical control box 60 is fixedly installed on the outside of the outer shell 10. The electrical control box 60 contains at least a control board and a three-phase voltage regulation module. The heating plate 40, temperature sensor 36, and three-phase voltage regulation module are all electrically connected to the control board. The three-phase voltage regulation module is a conventional control module in the art. Based on the data fed back by the temperature sensor 36, the working conduction angle of the three-phase voltage regulation module is adjusted, thereby controlling the heating power of the heating plate 40 and realizing dynamic adjustment of the heating power. In the above preferred embodiment of this utility model, the air temperature can be freely adjusted, the deviation of the air temperature can be precisely controlled within ±2℃, and the power can be adjusted within the range of 0 to 72kW. The electrical control box 60 can also be equipped with other necessary electrical components according to actual conditions, such as 200A four-core terminals, three-phase four-wire 380V air circuit breaker with leakage protection, relays, three-phase ammeters and voltmeters, etc.

[0043] To ensure a simple and reliable structure, ease of manufacturing, reduced air resistance within the duct, and improved fan efficiency, in some preferred embodiments, the duct component 20 includes a rectangular box 22, a transition connecting pipe 23, and a cylindrical inner cylinder 24 arranged sequentially. The heating plate 40 is correspondingly disposed within the rectangular box 22. The rectangular box 22 facilitates the installation of the heating plate 40 while effectively ensuring heating performance. The inner cross-section of the transition connecting pipe 23 near the rectangular box 22 matches the inner cross-section of the rectangular box 22, and the inner cross-section of the transition connecting pipe 23 near the cylindrical inner cylinder 24 matches the inner cross-section of the cylindrical inner cylinder 24. Therefore, the transition connecting pipe 23 serves as... The rectangular air duct corresponding to the rectangular housing 22 is gradually transitioned to a circular air duct corresponding to the cylindrical inner cylinder 24, effectively reducing air resistance within the air duct. Correspondingly, the outer shell 10 includes a rectangular outer shell 13 and a cylindrical outer cylinder 14 disposed at one end of the rectangular outer shell 13. The outer port of the cylindrical outer cylinder 14 serves as the outer shell outlet 12. The end of the cylindrical inner cylinder 24 furthest from the transition connecting pipe 23 is coaxially disposed within the cylindrical outer cylinder 14, allowing for easy connection to a blower. Both the rectangular housing 22 and the transition connecting pipe 23 are disposed within the rectangular outer shell 13. The inner cavity of the rectangular outer shell 13 is provided with positioning and connection structures corresponding to the rectangular housing 22 and the transition connecting pipe 23. The air duct component 20 is preferably made of galvanized steel sheet; the outer shell 10 is preferably welded from galvanized steel sheet using a powder-coated method.

[0044] In some preferred embodiments, the present invention has a fixed end plate 70 fixedly provided at the outer end face of the air inlet 11 of the outer shell, which can completely block the flow channel of the air inlet 11 of the outer shell (here, "complete blockage" does not consider the necessary air inlet hole structure, but only means that the main body of the fixed end plate 70 can completely cover the flow channel of the air inlet 11 of the outer shell). The fixed end plate 70 is provided with a plurality of first air inlets. The outer end face of the fixed end plate 70 is provided with a movable end plate 72 that can reciprocate horizontally via a slide rail 71. One side of the movable end plate 72 is in contact with the outer end face of the fixed end plate 70. The movable end plate 72 is provided with a plurality of second air inlets that correspond one-to-one with the first air inlets. The movable end plate 72 is equipped with a drive mechanism that drives it to move along the slide rail 71. By moving the movable end plate 72 along the slide rail 71, the first air inlets and the second air inlets can switch between an aligned state and a misaligned state. The shape of the first and second air inlets is not limited, as long as their shapes and specifications are consistent. In the embodiment shown in the attached drawings of this utility model, the first and second air inlets are preferably rectangular air inlets arranged in a rectangular array. When they are completely aligned, the maximum air intake can be achieved. When they are gradually staggered, the air intake will decrease sequentially. After implementing the above scheme, the wind speed during operation can be adjusted within the range of 0 to 30 m / s. The blower can adopt a conventional simple structure, and its power and speed do not need to be changed. The air intake process parameters are controlled by the sliding adjustment of the movable end plate 72.

[0045] The movable end plate 72 can be adjusted by any linear displacement drive mechanism, which can be automatic, manual, or manual-automatic integrated. To make the structure reliable and convenient for implementation, the present utility model preferably adopts the manual-automatic integrated mode. The specific structure is as follows: the drive mechanism includes a nut 82, a control handwheel 83, and a through-type stepping motor 84 with a rotating lead screw 81. The through-type stepping motor 84 is fixedly arranged on the fixed end plate 70, the nut 82 is fixedly arranged on the movable end plate 72, and the rotating lead screw 81 and the nut 82 cooperate to form a lead screw-nut mechanism; one end of the lead screw 81 is fixedly connected to the control handwheel 83; the through-type stepping motor 84 and the rotating lead screw 81 are existing conventional complete sets of components. When the through-type stepping motor 84 is not working, the adjustment can be carried out by manually rotating the control handwheel 83. In some preferred embodiments, the through-type stepping motor 84 can also be provided with a flow sensor or a wind speed sensor in the air duct to achieve linkage control. In some preferred embodiments, when the heating power of the heating plate 40 remains unchanged, the through-type stepping motor 84 can also be linked with the above temperature sensor 36 to adjust the heating temperature by changing the air intake volume. To make the overall structure more reliable, the present utility model also arranges stroke limiters 73 at both ends of the slide rail 71 for controlling the moving stroke of the movable end plate 72, that is, equivalent to controlling the maximum moving amount of the movable end plate 72. Specifically, the stroke limiter 73 can be various mechanical limiting structures or various stroke limit sensors.

Claims

1. A grain dryer heat source device, comprising a shell (10), one end of the shell (10) is provided with a shell air inlet (11), the other end is provided with a shell air outlet (12), and the shell air outlet (12) is provided with a blower connecting structure, characterized in that: An air duct component (20) is provided inside the outer shell (10). One end of the air duct component (20) is connected to the air inlet (11) of the outer shell and the other end is connected to the air outlet (12) of the outer shell. Multiple heating plates (40) are fixedly arranged vertically and horizontally in the inner cavity of the air duct component (20) by a mounting bracket (30). Each heating plate (40) is horizontally arranged and is a microcrystalline glass plate coated with an electrothermal film and conductive electrodes.

2. A heat source for a grain dryer as claimed in claim 1, characterised in that: The area where the conductive electrode of the heating plate (40) is located is provided with an electrical connection hole (41) that penetrates the upper and lower surfaces of the heating plate (40). The electrical connection hole (41) is connected to a copper lug by a stainless steel bolt. The copper lug is used to connect the circuit wire.

3. A heat source for a grain dryer as claimed in claim 2, characterised in that: The conductive electrodes of the heating plate (40) are located at the end of the heating plate (40) near the air inlet (11) of the outer casing, and the outer end face of the air duct component (20) near the air inlet (11) of the outer casing is fixedly provided with a wire groove bracket (50) for routing circuit wires.

4. A heat source for a grain dryer as claimed in claim 1, characterised in that: Support members (21) are fixedly installed on both sides of the inner cavity of the air duct component (20). The upper surface of the support member (21) and the two sides of the inner cavity of the air duct component (20) are combined to form a support slot, and the mounting bracket (30) is snapped into the support slot.

5. A heat source for a grain dryer as claimed in claim 4 wherein: The inner cavity of the air duct component (20) is provided with multiple sets of heating plates (40), each set of heating plates (40) having two to five pieces. Each set of heating plates (40) is provided with a corresponding mounting bracket (30). Each mounting bracket (30) includes a first side bracket (31), a second side bracket (32), a top bracket (33), a bottom bracket (34), and an elastic protective gasket (35). The first side bracket (31) and the second side bracket (32) are arranged opposite to each other, with the first side bracket (31) and the second side bracket (32) facing each other. A heating plate mounting slot is provided on one side. The two sides of the heating plate (40) are respectively secured in the heating plate mounting slot by elastic protective pads (35). The elastic protective pads (35) have U-shaped slots that are adapted to the side ends of the heating plate (40). The top of the first side bracket (31) and the top of the second side bracket (32) are respectively fixedly connected by a bolt connection structure and a top bracket (33). The bottom of the first side bracket (31) and the bottom of the second side bracket (32) are respectively fixedly connected by a bolt connection structure and a bottom bracket (34).

6. A heat source for a grain dryer as claimed in claim 5 wherein: Each heating plate (40) is equipped with at least one temperature sensor (36). The temperature sensor (36) is fixedly mounted on the first side bracket (31) or the second side bracket (32) by a threaded connection structure. One end of the temperature sensor (36) is a temperature measuring end and the other end is a wire connection end. Its temperature measuring end extends to the interval area between the first side bracket (31) and the second side bracket (32). The wire connection end is correspondingly located on the outside of the first side bracket (31) or the outside of the second side bracket (32). The outside of the first side bracket (31) and the outside of the second side bracket (32) refer to the side away from each other.

7. A heat source for a grain dryer as claimed in claim 6, characterised in that: An electrical control box (60) is fixedly installed on the outside of the outer casing (10). The electrical control box (60) contains at least a control board and a three-phase voltage regulating module. The heating plate (40), temperature sensor (36), and three-phase voltage regulating module are all electrically connected to the control board.

8. A heat source for a grain dryer as claimed in claim 1, characterised in that: The air duct component (20) includes a rectangular box (22), a transition connecting pipe (23), and a cylindrical inner cylinder (24) arranged sequentially. The inner cavity cross-section of the transition connecting pipe (23) near the rectangular box (22) is consistent with the inner cavity cross-section of the rectangular box (22), and the inner cavity cross-section of the transition connecting pipe (23) near the cylindrical inner cylinder (24) is consistent with the inner cavity cross-section of the cylindrical inner cylinder (24). The outer shell (10) includes a rectangular box (22), a transition connecting pipe (23), and a cylindrical inner cylinder (24). The outer shell (13) and the cylindrical outer cylinder (14) are located at one end of the rectangular outer shell (13). The outer port of the cylindrical outer cylinder (14) is the air outlet (12) of the outer shell. The cylindrical inner cylinder (24) is coaxially located inside the cylindrical outer cylinder (14) at the end away from the transition connecting pipe (23). The rectangular box (22) and the transition connecting pipe (23) are both located inside the rectangular outer shell (13). The heating plate (40) is located inside the rectangular box (22).

9. A heat source device for a grain dryer as described in any one of claims 1 to 8, characterized in that: A fixed end plate (70) is fixedly installed on the outer end face of the air inlet (11) of the outer shell, which can completely block the flow channel of the air inlet (11) of the outer shell. The fixed end plate (70) is provided with a plurality of first air inlets. The outer end face of the fixed end plate (70) is provided with a movable end plate (72) that can move back and forth in the horizontal direction via a slide rail (71). One side of the movable end plate (72) is in contact with the outer end face of the fixed end plate (70). The movable end plate (72) is provided with a plurality of second air inlets that correspond one-to-one with the first air inlets. The movable end plate (72) is equipped with a drive mechanism that drives it to move along the slide rail (71). By moving the movable end plate (72) along the slide rail (71), the first air inlets and the second air inlets can switch between an aligned state and a misaligned state.

10. A heat source for a grain dryer as claimed in claim 9, characterised in that: The drive mechanism includes a nut (82), a control handwheel (83), and a through-type stepper motor (84) with a rotating lead screw (81). The through-type stepper motor (84) is fixedly mounted on the fixed end plate (70), and the nut (82) is fixedly mounted on the movable end plate (72). The rotating lead screw (81) and the nut (82) cooperate to form a lead screw and nut mechanism. One end of the lead screw (81) is fixedly connected to the control handwheel (83). Both ends of the slide rail (71) are equipped with travel limiters (73) for controlling the movement of the movable end plate (72).

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