Automatic tracking device for coal mill outlet temperature

Abstract

The present application relates to coal mill equipment technical field, especially coal mill outlet temperature automatic tracking device, its technical scheme includes: shell, hot air pipe, second support frame, temperature sensor, cold air pipe and transmission shaft, the shell one side outer wall inserts the hot air pipe and is installed, the hot air pipe one end outer wall is provided with hot air shutter, the hot air pipe upper end outer wall one side inserts the cold air pipe and is installed, the cold air pipe one end outer wall is provided with cold air shutter, the cold air shutter inner wall one side is installed with second support frame, the second support frame inside rotationally installs transmission shaft, by setting transmission shaft, driven shaft and heating tube, reach the effect of the temperature of the air inlet is controlled conveniently, guarantee the temperature constant of the airflow in the cold air pipe, thereby the temperature of the air supply is controlled conveniently, improve the mixing efficiency of hot air and cold air, guarantee the heat exchange efficiency and mixed uniformity of hot air and cold air.

Description

Technical Field

[0001] This invention relates to the field of coal mill equipment technology, specifically to an automatic tracking device for coal mill outlet temperature. Background Technology

[0002] Mills can be classified according to the different grinding media and grinding materials: ball mills, column mills, rod mills, tube mills, autogenous mills, vortex roller mills, vertical mills, multi-layer vertical mills, vertical roller mills, disc mills, DMC mills, etc. The general principle of a mill is as follows: the material enters the mill's feeding device through the feeding equipment, and hot air at a temperature of about 350 degrees Celsius also enters the feeding device through the air inlet pipe. The raw coal containing moisture begins to undergo heat exchange here. When the raw coal enters the mill's drying chamber, the raw coal is lifted by a specially designed lifting device, and the raw coal containing moisture undergoes intense heat exchange here to be dried. The dried coal blocks enter the coarse grinding chamber through a double-layer partition plate with a feed plate. This chamber contains grinding media, and the coal blocks are crushed and ground into coal powder in this chamber. While the coal is being crushed, a dedicated induced draft fan carries the crushed coal powder and gas out of the mill through the mill's outlet device. The outlet temperature of the coal mill directly affects the quality of the coal powder exiting the mill. If the temperature is too low, the coal powder will not be dried sufficiently and will have high moisture content; if the temperature is too high, the coal mill system will reach the ignition point of the coal powder and spontaneously combust, which can even lead to an explosion of the coal mill system. Therefore, it is very important to control the coal mill outlet temperature within a stable range.

[0003] A search revealed that patent publication number CN110433950A discloses a coal mill outlet temperature control device, including an SIS system and a DCS system. The DCS system is connected to various operating equipment to obtain operational data. It also includes a control module capable of calculating outlet temperature data based on received coal quality data and operational data. The control module establishes a signal connection with the SIS system to obtain coal quality data, and with the DCS system to obtain operational data and transmit outlet temperature data. The DCS system can adjust the operation of the coal mill based on the outlet temperature data. In this coal mill outlet temperature control device, by setting up a control module and connecting it to both the SIS and DCS systems, coal quality and operational data can be acquired in a timely manner. The device can automatically calculate outlet temperature data and transmit it to the DCS system, thereby enabling automatic adjustment. Furthermore, the adjustment method is more objective and precise, resulting in safer and more economical operation of the coal mill.

[0004] Currently, the control of inlet air temperature mainly relies on manual adjustment by operators, with real-time monitoring and adjustment. However, when the temperature of the grate cooler fluctuates greatly, it is difficult to stabilize the outlet temperature at the ideal control value manually. The temperature is generally within ±6℃, and in extreme cases, the temperature may be too high, triggering the coal mill system to trip, posing a serious safety hazard. Furthermore, the existing technology does not consider the temperature control structure for the cold air. Since the existing cold air is directly controlled by the external environment, climate change causes temperature variations, which have a significant impact on the temperature of the cold air, thus leading to changes in the supply air temperature. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic tracking device for coal mill outlet temperature to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an automatic tracking device for coal mill outlet temperature, comprising a housing, a hot air duct, a second support frame, a temperature sensor, a cold air duct, and a drive shaft. A hot air duct is inserted into the outer wall of one side of the housing, a hot air damper is provided on the outer wall of one end of the hot air duct, a cold air duct is inserted into the outer wall of the upper end of the hot air duct, a cold air damper is provided on the outer wall of one end of the cold air duct, a second support frame is installed on one side of the inner wall of the cold air damper, and a drive shaft is rotatably installed inside the second support frame.

[0007] When using the automatic coal mill outlet temperature tracking device in this technical solution, hot air and cold air flow inside the hot air pipe and cold air pipe respectively. The flow rate is adjusted by the opening of the hot air damper and cold air damper, thereby regulating the temperature of the supplied air. The controller can adjust the heating temperature of the heating tube based on the temperature data of the airflow temperature inside the cold air pipe detected by the temperature sensor. This heats the heat transfer rod through the heat transfer oil, thereby heating the gas flowing inside the cold air pipe and ensuring a constant temperature of the airflow inside the cold air pipe. This facilitates the control of the supplied air temperature. Two helical gears mesh with each other, and the drive shaft can drive the driven shaft to rotate through the helical gears, thereby driving the turbine blades to rotate. The turbine blades can drive the airflow inside the hot air pipe to rotate, thereby improving the mixing efficiency of hot air and cold air and ensuring the heat exchange efficiency and mixing uniformity of hot air and cold air. After the hot air enters the shell, it is moved by the partition plate. Then, the gas inside the drying chamber can enter the shell through the circulation pipe and mix with the hot air inside the shell before being sent into the drying chamber, thereby heating the air inside the drying chamber.

[0008] Preferably, a rotating shaft is rotatably installed inside the outer shell, and a circular array of partition plates is installed on the outer wall of the rotating shaft. The partition plates can separate the space inside the outer shell, so that the hot air flows at a uniform speed and provide time for the hot air and cold air to exchange heat.

[0009] The rotating shaft passes through one end of the outer wall of the housing and is equipped with a power device. The power device can drive the rotating shaft and the partition plate to rotate, thereby driving the hot air to move.

[0010] Preferably, an exhaust pipe is inserted and installed on the outer wall of the outer shell on the side away from the hot air pipe, and an air supply device is provided on the outer wall of the exhaust pipe. The air inside the outer shell is sent into the drying chamber through the exhaust pipe and the air supply device.

[0011] A circulation pipe is inserted and installed on one side of the upper outer wall of the outer shell. The circulation pipe is connected to the inside of the drying chamber. The gas inside the drying chamber can enter the inside of the outer shell through the circulation pipe, mix with the hot air inside the outer shell, and then be sent into the drying chamber to heat the air inside the drying chamber.

[0012] Temperature sensors are installed on one side of the inner wall of the hot air duct, cold air duct, and circulation duct. The temperature sensors detect the temperature of the gas inside the hot air duct, cold air duct, and circulation duct, respectively. This allows the external controller to control the air supply speed of the air supply device and the opening degree of the hot air damper and cold air damper, thereby controlling the temperature of the supplied air. It should be noted that the operation is carried out according to the received temperature data and multiple operating programs, using a set calculation rule. The set calculation rule can be selected with reference to existing technologies or can be selected and set according to the actual operating conditions. This is not an improvement of this application and will not be repeated here.

[0013] Preferably, a circular array of fan blades is installed on one side of the outer wall of the drive shaft. When the cold air flows inside the cold air duct, it will drive the drive shaft to rotate in a circular motion through the fan blades.

[0014] The outer walls on both sides of the drive shaft are equipped with equally spaced parallel heat-conducting rods. Both the heat-conducting rods and the drive shaft are provided with heat exchange grooves, and the heat exchange grooves are filled with heat-conducting oil.

[0015] A heating tube is rotatably installed on one side of the upper end of the inner wall of the heat exchange tank. A connecting wire is provided on one side of the upper outer wall of the heating tube. The heating tube is electrically connected to an external controller through the connecting wire. The controller can adjust the heating temperature of the heating tube based on the temperature data of the airflow inside the cold air duct detected by the temperature sensor. This heats the heat transfer rod through the heat transfer oil and heats the gas flowing inside the cold air duct, ensuring a constant temperature of the airflow inside the cold air duct, thus facilitating the control of the air supply temperature.

[0016] Preferably, a first support frame is installed on one side of the inner wall of the hot air duct, and a driven shaft is rotatably installed inside the first support frame. A turbine blade with a circular array is installed on the outer wall of the driven shaft. The turbine blade can drive the airflow inside the hot air duct to rotate, thereby improving the mixing efficiency of hot air and cold air and ensuring the heat exchange efficiency and mixing uniformity of hot air and cold air.

[0017] The first support frame is equipped with helical gears on the outer wall of the end opposite to the driven shaft and the outer wall of the lower end of the transmission shaft. The two helical gears mesh with each other, and the transmission shaft can drive the driven shaft to rotate through the helical gears, thereby driving the turbine blades to rotate.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: By setting up a drive shaft, a driven shaft, and a heating tube, the present invention achieves the effect of easy control of the air intake temperature. The controller can adjust the heating temperature of the heating tube based on the temperature sensor's detection data of the airflow temperature inside the cold air duct, thereby heating the heat-conducting rod through the heat transfer oil and heating the gas flowing inside the cold air duct, ensuring a constant airflow temperature inside the cold air duct, thus facilitating the control of the air supply temperature. The two helical gears mesh with each other, and the drive shaft can drive the driven shaft to rotate through the helical gears, thereby driving the turbine blades to rotate. The turbine blades can drive the airflow inside the hot air duct to rotate, thereby improving the mixing efficiency of hot and cold air and ensuring the heat exchange efficiency and mixing uniformity of hot and cold air. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the outer shell structure of the present invention;

[0020] Figure 2 This is an enlarged schematic diagram of the outer shell structure of the present invention;

[0021] Figure 3 This is a partially enlarged schematic diagram of the cold air duct structure of the present invention;

[0022] Figure 4 This is a partially enlarged schematic diagram of the hot air duct structure of the present invention.

[0023] In the diagram: 1. Outer shell; 11. Rotating shaft; 12. Partition plate; 13. Exhaust duct; 14. Air supply device; 15. Circulation duct; 2. Hot air duct; 21. Temperature sensor; 22. Hot air damper; 23. Cold air duct; 24. Cold air damper; 25. First support frame; 26. Driven shaft; 27. Turbine blade; 3. Second support frame; 31. Drive shaft; 32. Heat-conducting rod; 33. Heat exchange tank; 34. Heating tube; 35. Connecting wire; 36. Fan blade; 37. Helical gear. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Please see Figures 1 to 4 The present invention provides three embodiments:

[0028] Example 1: An automatic tracking device for coal mill outlet temperature includes a housing 1, a hot air pipe 2, a second support frame 3, a temperature sensor 21, a cold air pipe 23, and a drive shaft 31. The hot air pipe 2 is inserted into the outer wall of one side of the housing 1. A hot air damper 22 is provided on the outer wall of one end of the hot air pipe 2. A cold air pipe 23 is inserted into the outer wall of the upper end of the hot air pipe 2. A cold air damper 24 is provided on the outer wall of one end of the cold air pipe 23. The second support frame 3 is installed on one side of the inner wall of the cold air damper 24. The drive shaft 31 is rotatably installed inside the second support frame 3.

[0029] A circular array of fan blades 36 is installed on one side of the outer wall of the drive shaft 31. When the cold air flows inside the cold air duct 23, it will drive the drive shaft 31 to rotate in a circular motion through the fan blades 36.

[0030] Heat-conducting rods 32 are installed on both sides of the outer wall of the drive shaft 31 at equal intervals and parallel distribution. Heat exchange grooves 33 are opened inside the heat-conducting rods 32 and the drive shaft 31, and heat-conducting oil is stored inside the heat exchange grooves 33.

[0031] A heating tube 34 is rotatably installed on one side of the upper inner wall of the heat exchange tank 33. A connecting wire 35 is provided on one side of the upper outer wall of the heating tube 34. The heating tube 34 is electrically connected to an external controller through the connecting wire 35. The controller can adjust the heating temperature of the heating tube 34 based on the temperature data detected by the temperature sensor 21 of the airflow temperature inside the cold air duct 23. This heats the heat transfer rod 32 through the heat transfer oil, thereby heating the gas flowing inside the cold air duct 23 and ensuring that the temperature of the airflow inside the cold air duct 23 is constant, which facilitates the control of the air supply temperature.

[0032] Example 2: An automatic tracking device for coal mill outlet temperature includes a housing 1, a hot air pipe 2, a second support frame 3, a temperature sensor 21, a cold air pipe 23, and a drive shaft 31. The hot air pipe 2 is inserted into the outer wall of one side of the housing 1. A hot air damper 22 is provided on the outer wall of one end of the hot air pipe 2. A cold air pipe 23 is inserted into the outer wall of the upper end of the hot air pipe 2. A cold air damper 24 is provided on the outer wall of one end of the cold air pipe 23. The second support frame 3 is installed on one side of the inner wall of the cold air damper 24. The drive shaft 31 is rotatably installed inside the second support frame 3.

[0033] A circular array of fan blades 36 is installed on one side of the outer wall of the drive shaft 31. When the cold air flows inside the cold air duct 23, it will drive the drive shaft 31 to rotate in a circular motion through the fan blades 36.

[0034] A first support frame 25 is installed on one side of the inner wall of the hot air duct 2. A driven shaft 26 is rotatably installed inside the first support frame 25. A turbine blade 27 with a circular array is installed on the outer wall of the driven shaft 26. The turbine blade 27 can drive the airflow inside the hot air duct 2 to rotate, thereby improving the mixing efficiency of hot air and cold air and ensuring the heat exchange efficiency and mixing uniformity of hot air and cold air.

[0035] Helical gears 37 are installed on the outer wall of the first support frame 25 away from the driven shaft 26 and the outer wall of the lower end of the transmission shaft 31. The two helical gears 37 mesh with each other, and the transmission shaft 31 can drive the driven shaft 26 to rotate through the helical gears 37, thereby driving the turbine blades 27 to rotate.

[0036] Example 3: An automatic tracking device for coal mill outlet temperature includes a housing 1, a hot air pipe 2, a second support frame 3, a temperature sensor 21, a cold air pipe 23, and a drive shaft 31. The hot air pipe 2 is inserted into the outer wall of one side of the housing 1. A hot air damper 22 is provided on the outer wall of one end of the hot air pipe 2. An external controller controls the opening of the hot air damper 22, which can control the flow of hot air inside the hot air pipe 2. A cold air pipe 23 is inserted into the outer wall of the upper end of the hot air pipe 2. A cold air damper 24 is provided on the outer wall of one end of the cold air pipe 23. An external controller controls the opening of the cold air damper 24, which can control the flow of hot air inside the cold air pipe 23. A second support frame 3 is installed on one side of the inner wall of the cold air damper 24. The drive shaft 31 is rotatably installed inside the second support frame 3.

[0037] A rotating shaft 11 is rotatably installed inside the outer casing 1. A circular array of partition plates 12 are installed on the outer wall of the rotating shaft 11. The partition plates 12 can separate the space inside the outer casing 1, so that the hot air flows at a uniform speed and provides time for the hot air and cold air to exchange heat.

[0038] A power unit is installed on one end of the outer wall of the outer casing 1 through the rotating shaft 11. The power unit can drive the rotating shaft 11 and the partition plate 12 to rotate, thereby driving the hot air to move. By controlling the rotation speed of the partition plate 12, the amount of hot air delivered to the drying chamber can be controlled. Under the premise of ensuring the internal temperature of the drying chamber, the use of hot air in the high-temperature area of ​​the grate cooler can be reduced as much as possible, thereby increasing the waste heat power generation and reducing the amount of cold air entering, thus reducing the system power consumption.

[0039] An exhaust pipe 13 is inserted and installed on the outer wall of the outer shell 1 on the side away from the hot air pipe 2. An air supply device 14 is provided on the outer wall of the exhaust pipe 13. The air inside the outer shell 1 is sent into the drying chamber through the exhaust pipe 13 and the air supply device 14.

[0040] A circulation pipe 15 is inserted and installed on one side of the upper outer wall of the outer shell 1. The circulation pipe 15 is connected to the inside of the drying chamber. The gas inside the drying chamber can enter the inside of the outer shell 1 through the circulation pipe 15 and mix with the hot air inside the outer shell 1 before being sent into the drying chamber to heat the air inside the drying chamber.

[0041] Temperature sensors 21 are provided on one side of the inner wall of the hot air duct 2, the cold air duct 23, and the circulation duct 15. As is well known to those skilled in the art, the massage device of the present invention also needs to provide temperature sensors 21 for normal operation. As is well known to those skilled in the art, the provision of temperature sensors 21 is commonplace and is a conventional means or common knowledge, so it will not be described in detail here. Those skilled in the art can arbitrarily select and match according to their needs or convenience. The temperature sensors 21 detect the temperature of the gas inside the hot air duct 2, the cold air duct 23, and the circulation duct 15 respectively, so that the external controller can control the air supply speed of the air supply device 14 and control the opening of the hot air damper 22 and the cold air damper 24 respectively, thereby controlling the temperature of the air supply. It should be noted that the operation is carried out according to the received temperature data and multiple operating programs, and the set calculation rules are used. The set calculation rules can be selected with reference to the prior art or selected and set according to the actual operating conditions. This is not an improvement of this application, so it will not be described in detail here.

[0042] A circular array of fan blades 36 is installed on one side of the outer wall of the drive shaft 31. When the cold air flows inside the cold air duct 23, it will drive the drive shaft 31 to rotate in a circular motion through the fan blades 36.

[0043] Heat-conducting rods 32 are installed on both sides of the outer wall of the drive shaft 31 at equal intervals and parallel distribution. Heat exchange grooves 33 are opened inside the heat-conducting rods 32 and the drive shaft 31, and heat-conducting oil is stored inside the heat exchange grooves 33.

[0044] A heating tube 34 is rotatably installed on one side of the upper inner wall of the heat exchange tank 33. A connecting wire 35 is provided on one side of the upper outer wall of the heating tube 34. The heating tube 34 is electrically connected to an external controller through the connecting wire 35. The controller can adjust the heating temperature of the heating tube 34 based on the temperature data detected by the temperature sensor 21 of the airflow temperature inside the cold air duct 23. This heats the heat transfer rod 32 through the heat transfer oil, thereby heating the gas flowing inside the cold air duct 23 and ensuring that the temperature of the airflow inside the cold air duct 23 is constant, which facilitates the control of the air supply temperature.

[0045] A first support frame 25 is installed on one side of the inner wall of the hot air duct 2. A driven shaft 26 is rotatably installed inside the first support frame 25. A turbine blade 27 with a circular array is installed on the outer wall of the driven shaft 26. The turbine blade 27 can drive the airflow inside the hot air duct 2 to rotate, thereby improving the mixing efficiency of hot air and cold air and ensuring the heat exchange efficiency and mixing uniformity of hot air and cold air.

[0046] Helical gears 37 are installed on the outer wall of the first support frame 25 away from the driven shaft 26 and the outer wall of the lower end of the transmission shaft 31. The two helical gears 37 mesh with each other, and the transmission shaft 31 can drive the driven shaft 26 to rotate through the helical gears 37, thereby driving the turbine blades 27 to rotate.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An automatic temperature tracking device for coal mill outlet, comprising a housing (1), a hot air duct (2), a second support frame (3), a temperature sensor (21), a cold air duct (23), and a drive shaft (31), characterized in that: A hot air pipe (2) is inserted into the outer wall of one side of the outer shell (1). A hot air damper (22) is provided on the outer wall of one end of the hot air pipe (2). A cold air pipe (23) is inserted into the outer wall of the upper end of the hot air pipe (2). A cold air damper (24) is provided on the outer wall of one end of the cold air pipe (23). A second support frame (3) is installed on one side of the inner wall of the cold air damper (24). A drive shaft (31) is rotatably installed inside the second support frame (3). The drive shaft (31) has a circular array of fan blades (36) installed on one side of its outer wall. When the cold air flows inside the cold air pipe (23), it will drive the drive shaft (31) to rotate in a circular motion through the fan blades (36). The outer walls of both sides of the drive shaft (31) are equipped with equally spaced parallel heat-conducting rods (32), and heat exchange grooves (33) are opened inside the heat-conducting rods (32) and the drive shaft (31), and heat-conducting oil is stored inside the heat exchange grooves (33). A heating tube (34) is rotatably installed on one side of the upper end of the inner wall of the heat exchange tank (33). A connecting line (35) is provided on one side of the upper outer wall of the heating tube (34). The heating tube (34) is electrically connected to an external controller through the connecting line (35). The controller can adjust the heating temperature of the heating tube (34) based on the temperature data of the airflow temperature inside the cold air duct (23) detected by the temperature sensor (21). This heats the heat-conducting rod (32) through the heat transfer oil, and heats the gas flowing inside the cold air duct (23), ensuring that the temperature of the airflow inside the cold air duct (23) is constant, thus facilitating the control of the air supply temperature. A first support frame (25) is installed on one side of the inner wall of the hot air pipe (2). A driven shaft (26) is rotatably installed inside the first support frame (25). A turbine blade (27) with a circular array is installed on the outer wall of the driven shaft (26). The turbine blade (27) can drive the airflow inside the hot air pipe (2) to rotate, thereby improving the mixing efficiency of hot air and cold air and ensuring the heat exchange efficiency and mixing uniformity of hot air and cold air. The first support frame (25) is equipped with helical gears (37) on the outer wall of the end opposite to the driven shaft (26) and the outer wall of the lower end of the transmission shaft (31). The two helical gears (37) mesh with each other, and the transmission shaft (31) can drive the driven shaft (26) to rotate through the helical gears (37), thereby driving the turbine blades (27) to rotate.

2. The automatic coal mill outlet temperature tracking device according to claim 1, characterized in that: The housing (1) is rotatably mounted with a rotating shaft (11), and the outer wall of the rotating shaft (11) is equipped with a circular array of partition plates (12). The partition plates (12) can separate the space inside the housing (1), so that the hot air flows at a uniform speed and provides time for the hot air and cold air to exchange heat. The rotating shaft (11) is connected to a power device through one end of the outer wall of the outer shell (1). The power device can drive the rotating shaft (11) and the partition plate (12) to rotate, thereby driving the hot air to move.

3. The automatic tracking device for coal mill outlet temperature according to claim 1, characterized in that: An exhaust pipe (13) is inserted into the outer wall of the outer shell (1) on the side away from the hot air pipe (2). An air supply device (14) is provided on the outer wall of the exhaust pipe (13). The air inside the outer shell (1) is sent into the drying chamber through the exhaust pipe (13) and the air supply device (14). A circulation pipe (15) is inserted and installed on one side of the upper outer wall of the outer shell (1). The circulation pipe (15) is connected to the inside of the drying chamber. The gas inside the drying chamber can enter the inside of the outer shell (1) through the circulation pipe (15) and mix with the hot air inside the outer shell (1) before being sent into the drying chamber to heat the air inside the drying chamber. Temperature sensors (21) are installed on one side of the inner wall of the hot air pipe (2), cold air pipe (23) and circulation pipe (15). The temperature sensors (21) detect the temperature of the gas inside the hot air pipe (2), cold air pipe (23) and circulation pipe (15) respectively, so that the external controller can control the air supply speed of the air supply device (14), control the opening of the hot air damper (22) and cold air damper (24), and thus control the temperature of the air supply. The system operates according to the set calculation rules based on the received temperature data and multiple operating programs.

Images