Automatic constant temperature device for hydroxyethyl starch spray drying

Abstract

The utility model discloses an automatic constant temperature device for hydroxyethyl starch spray drying, which comprises an atomizer mounted at an opening in the top of a spray drying tank, a constant temperature device cover is suspended above the atomizer through a hoisting system, and the atomizer is covered in the middle of the constant temperature device cover; the constant temperature device cover is of a thick-wall bell jar type structure, the device wall is of a hollow structure with an inner layer and an outer layer, two pipeline connectors are arranged on the opposite sides of the outer layer wall of the constant temperature device cover respectively, and the two pipeline connectors and the hollow part form a channel. The atomizer is connected with the first heat exchange system; the constant temperature device cover is connected with the second heat exchange system; a drying air supply system is arranged on the spray drying tank; each system is provided with a temperature sensing and monitoring mechanism and an automatic temperature adjusting mechanism. According to the utility model, the automatic constant temperature in the spray drying process is realized, the fault of the atomizer caused by overheat operation is avoided, the insufficient drying or overheat gelatinization of materials is avoided, the automatic control of the temperature in each link is realized, the manual labor is saved, and the safety risk caused by manual operation is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of constant temperature devices, and particularly relates to an automatic constant temperature device for spray drying of hydroxyethyl starch. Background Art

[0002] Hydroxyethyl starch series products, such as hydroxyethyl starch 130 / 0.4, are raw pharmaceutical materials used for the treatment and prevention of hypovolemia, acute hemodilution, etc. The production of hydroxyethyl starch usually obtains the finished product through spray drying. In the spray drying process, the liquid medicine first becomes a mist through the high-speed rotation of an atomizer, and then is dried through a high-temperature air supply system to obtain a powder, which falls into the bottom collecting tank. During the long-term high-speed operation of the atomizer, the temperature changes greatly, and too high a temperature is likely to cause abnormalities in the atomization equipment, thereby affecting the quality indicators of hydroxyethyl starch products (such as absorbance); in addition, due to the unstable pressure of the drying gas in the spray drying tank, the inlet air temperature of the equipment is affected. When the inlet air temperature is high, the atomized powder will become paste due to the high temperature; when the inlet air temperature is low, drying will be insufficient and the moisture content of the powder will exceed the standard. At present, during spray drying, operators need to manually control the inlet air speed and temperature at the production site all the time, and the operators need to climb to the top of the 5-meter-high spray drying tank regularly to check the operation status of the atomizer and the oil and water pipeline conditions. This operation has problems of high temperature and high heat and climbing safety. Summary of the Invention

[0003] The technical problems to be solved by the utility model are: inconvenient temperature control of the atomizer during the spray drying process of hydroxyethyl starch, safety risks in operation, malfunction caused by overheating of the atomizer during operation, and inconvenient control of the temperature and pressure of the drying gas.

[0004] The utility model provides an automatic constant temperature device for spray drying of hydroxyethyl starch, including an atomizer. The atomizer is installed at the opening on the top of the spray drying tank, and the lower part of the atomizer extends into the spray drying tank. A constant temperature device cover is suspended above the atomizer, and the constant temperature device cover can be vertically lifted and horizontally moved; the constant temperature device cover is a bell-shaped structure with an inner / outer double-layer wall, and the inner layer wall and the outer layer wall form a sealed hollow structure. The upper part of the atomizer is covered in the middle of the inner layer wall of the constant temperature device cover. Two pipeline interfaces are respectively arranged at opposite positions on the outer layer wall of the constant temperature device cover, and the two pipeline interfaces communicate with the hollow structure of the constant temperature device cover; the atomizer is connected to the first heat exchange system, and the constant temperature device cover is connected to the second heat exchange system through two pipeline interfaces; a drying air supply system is arranged on the spray drying tank; temperature sensing and monitoring mechanisms and temperature automatic adjustment mechanisms are arranged for the atomizer, the first heat exchange system, the second heat exchange system, and the drying air supply system, and the temperature sensing and monitoring mechanisms and the temperature automatic adjustment mechanisms are electrically connected to a PLC controller.

[0005] Preferably, the first heat exchange system includes an oil inlet pipe and an oil outlet pipe. One ends of the oil inlet pipe and the oil outlet pipe are respectively connected to both sides of the middle lower part of the side wall of the atomizer. The other end of the oil inlet pipe is connected to the outlet of the heat-conducting oil tank, and the other end of the oil outlet pipe is connected to the inlet of the first radiator. The outlet of the first radiator is connected to the inlet of the heat-conducting oil tank through a pipeline. A first pneumatic valve is arranged on the oil inlet pipe. A first alarm is arranged on the outer wall of the oil outlet pipe. An oil outlet temperature detection probe is arranged at the connection between the oil outlet pipe and the atomizer. The first radiator, the first pneumatic valve, the first alarm, and the oil outlet temperature detection probe are respectively electrically connected to the PLC controller.

[0006] Preferably, the second heat exchange system includes a water inlet pipe and a water outlet pipe. One ends of the water inlet pipe and the water outlet pipe are respectively connected to the two pipeline interfaces of the constant temperature device cover. The water inlet pipe is connected to the lower part of the outer layer wall, and the water outlet pipe is connected to the upper part of the outer layer wall. The other end of the water inlet pipe is connected to the outlet of the second radiator. The other end of the water outlet pipe is connected to the inlet of the second radiator. A second pneumatic valve is arranged on the water inlet pipe. A second alarm is arranged on the outer wall of the water outlet pipe. A water inlet temperature detection probe is arranged at the connection between the water inlet pipe and the constant temperature device cover. A water outlet temperature detection probe is arranged at the connection between the water outlet pipe and the constant temperature device cover. The second radiator, the second pneumatic valve, the second alarm, the water inlet temperature detection probe, and the water outlet temperature detection probe are respectively electrically connected to the PLC controller.

[0007] Preferably, the drying air supply system includes an air inlet duct, which is installed in the middle upper part of the side wall of the spray drying tank, and the height of the air inlet duct is lower than the spray port of the atomizer. An exhaust duct is installed in the middle lower part of the side wall of the spray drying tank, on the opposite side of the air inlet duct. On the air inlet duct, an air inlet pneumatic valve and an electric heating wire are successively arranged in the front and back along the air inlet direction, and the electric heating wire is arranged inside the air inlet duct. An air inlet temperature and humidity sensor is arranged at the connection between the air inlet duct and the spray drying tank. An exhaust pneumatic valve is arranged on the exhaust duct. An exhaust temperature and humidity sensor is arranged at the connection between the exhaust duct and the spray drying tank. The air inlet pneumatic valve, the electric heating wire, the air inlet temperature and humidity sensor, the exhaust pneumatic valve, and the exhaust temperature and humidity sensor are respectively electrically connected to the PLC controller.

[0008] Preferably, the constant temperature device cover is suspended above the atomizer through a hoisting system. The hoisting system includes a lifting chain, and a lifting hook is arranged at the lower end of the lifting chain. A hanging hole is fixedly installed at the top of the constant temperature device cover, and the hanging hole is hooked to the lifting chain through the lifting hook. The upper end of the lifting chain is connected to the hoisting mechanism of the crane, and the hoisting mechanism of the crane is arranged on the bridge, and the hoisting mechanism of the crane can move horizontally along the bridge.

[0009] Preferably, a liquid feed pipe is installed on the side wall of the atomizer, and a feed pneumatic valve is arranged on the liquid feed pipe. The feed pneumatic valve is electrically connected to the PLC controller.

[0010] The beneficial effects of the present utility model are:

[0011] Through the first and second heat exchange systems, simultaneous cooling inside and outside the atomizer is achieved, avoiding malfunctions of the atomizer due to overheating during operation; through the drying air supply system, precise temperature control of the drying gas is achieved, avoiding insufficient drying or overheating and gelatinization of hydroxyethyl starch; the first and second heat exchange systems and the drying air supply system are all equipped with sensors and automatic temperature control devices to achieve automatic temperature control of each link, saving manual labor and also avoiding safety risks brought by manual operation. Description of the Drawings

[0012] The drawings are used to provide further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0013] Figure 1 It is a schematic structural diagram of the automatic constant temperature device for spray drying of hydroxyethyl starch in the first embodiment;

[0014] Figure 2 It is a sectional view of the main view direction of the constant temperature device cover in the first embodiment;

[0015] Figure 3 It is a schematic structural diagram of the automatic constant temperature device for spray drying of hydroxyethyl starch in the second embodiment;

[0016] Among them, 1 - atomizer, 2 - constant temperature device cover, 3 - spray drying tank, 11 - oil inlet pipe, 12 - oil outlet pipe, 13 - heat-conducting oil tank, 14 - first radiator, 15 - first pneumatic valve, 16 - first alarm, 17 - oil outlet temperature detection probe, 18 - feed liquid inlet pipe, 19 - feed pneumatic valve, 21 - water inlet pipe, 22 - water outlet pipe, 23 - second radiator, 24 - second pneumatic valve, 25 - second alarm, 26 - water inlet temperature detection probe, 27 - water outlet temperature detection probe, 31 - air inlet duct, 32 - exhaust duct, 33 - air inlet pneumatic valve, 34 - electric heating wire, 35 - air inlet temperature and humidity sensor, 36 - exhaust pneumatic valve, 37 - exhaust temperature and humidity sensor, 41 - suspension chain, 42 - overhead crane mechanism, 43 - bridge. Detailed Embodiments

[0017] The following will describe in detail the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings. Among them, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams rather than physical diagrams, and should not be construed as a limitation to the present utility model. To better illustrate the specific implementation manners of the present utility model, some components in the accompanying drawings will be omitted, enlarged or reduced, which do not represent the sizes of actual products. For those skilled in the art, it is understandable that well-known structures such as the tank support in the accompanying drawings and their descriptions may be omitted. The icons of all "temperature detection probes" and "temperature and humidity sensors" in the accompanying drawings only indicate their installation positions, and their actual sizes will not affect the smoothness of the pipelines where they are located. Components such as the atomizer in the figure only represent their positions and connection relationships, and do not represent their actual sizes and dimensions. Embodiment 1

[0018] As Figure 1 shown, the hydroxyethyl starch spray drying automatic constant temperature device includes an atomizer 1, which is installed at the connection port on the top of the spray drying tank 3, and the spray port of the atomizer 1 extends into the spray drying tank 3. The constant temperature device cover 2 is suspended above the atomizer 1 through a hoisting system. The hoisting system includes a lifting chain 41, and a lifting hook is provided at the lower end of the lifting chain 41; a lifting hole is fixedly installed at the top of the constant temperature device cover 2, and the lifting hole is hooked to the lifting chain 41 through the lifting hook; the upper end of the lifting chain 41 is connected to the traveling crane mechanism 42, and the traveling crane mechanism 42 is arranged on the bridge 43. It should be noted that before the start of the drying process, the constant temperature device cover 2 is not installed and is not in the Figure 1 shown position. The hydroxyethyl starch liquid medicine to be dried is pre-loaded into the atomizer 1. Then, the traveling crane mechanism 42 hoists the constant temperature device cover 2 to a height higher than the atomizer 1 through the lifting chain 41, and then horizontally moves it to directly above the atomizer 1 and slowly lowers it until the atomizer 1 is fully covered. At this time, the water inlet and outlet interfaces on the constant temperature device cover 2 respectively correspond to the pipe orifice positions of the inlet pipe 21 and the outlet pipe 22 of the second heat exchange system. After fine-tuning the positions by the staff, the corresponding pipe interfaces are docked and installed to ensure firm connection. The inlet pipe 21 and the outlet pipe 22 are connected to the constant temperature device cover 2 by pipe interfaces that are convenient for disassembly and assembly.

[0019] As Figure 2 shown, the constant temperature device cover 2 is a thick-walled bell-shaped structure. The constant temperature device cover 2 is a hollow structure with an inner / outer double-layer wall. Considering its shielding relationship and complex line type, in Figure 1 the constant temperature device cover 2 is represented by a simplified view to show its structure and position. After the constant temperature device cover 2 is connected to the inlet pipe 21 and the outlet pipe 22 according to the above steps, the second pneumatic valve 24 is opened, and the second radiator 23 is started, and the cooling water is pumped into the constant temperature device cover 2 through the inlet pipe 21 until the cavity of the constant temperature device cover 2 is filled, and the cooling water flows out from the outlet pipe 22 to form a cooling water circulation loop.

[0020] The atomizer 1 is connected to the first heat exchange system. The first heat exchange system includes an oil inlet pipe 11 and an oil outlet pipe 12. One ends of the oil inlet pipe 11 and the oil outlet pipe 12 are respectively connected to both sides of the middle and lower part of the side wall of the atomizer 1. The other end of the oil inlet pipe 11 is connected to the outlet of the heat-conducting oil tank 13, and the other end of the oil outlet pipe 12 is connected to the inlet of the first radiator 14. The outlet of the first radiator 14 is connected to the inlet of the heat-conducting oil tank 13 through a pipeline. A first pneumatic valve 15 is provided on the oil inlet pipe 11. A first alarm 16 is provided on the outer wall of the oil outlet pipe 12. An oil outlet temperature detection probe 17 is provided at the connection between the oil outlet pipe 12 and the atomizer 1. The first radiator 14, the first pneumatic valve 15, the first alarm 16, and the oil outlet temperature detection probe 17 are respectively electrically connected to the PLC controller.

[0021] The constant temperature device cover 2 is connected to the second heat exchange system. The second heat exchange system includes a water inlet pipe 21 and a water outlet pipe 22. One ends of the water inlet pipe 21 and the water outlet pipe 22 are respectively connected to the two pipeline interfaces of the constant temperature device cover 2. The water inlet pipe 21 is connected to the lower part of the outer layer wall, and the water outlet pipe 22 is connected to the upper part of the outer layer wall. The other end of the water inlet pipe 21 is connected to the outlet of the second radiator 23. The other end of the water outlet pipe 22 is connected to the inlet of the second radiator 23. A second pneumatic valve 24 is provided on the water inlet pipe 21. A second alarm 25 is provided on the outer wall of the water outlet pipe 22. A water inlet temperature detection probe 26 is provided at the connection between the water inlet pipe 21 and the constant temperature device cover 2. A water outlet temperature detection probe 27 is provided at the connection between the water outlet pipe 22 and the constant temperature device cover 2. The second radiator 23, the second pneumatic valve 24, the second alarm 25, the water inlet temperature detection probe 26, and the water outlet temperature detection probe 27 are respectively electrically connected to the PLC controller.

[0022] The spray drying tank 3 is provided with a drying air supply system. The drying air supply system includes an air inlet pipe 31. The air inlet pipe 31 is installed in the middle and upper part of the side wall of the spray drying tank 3, and the height of the air inlet pipe 31 is lower than the spray port of the atomizer 1. An exhaust pipe 32 is installed in the middle and lower part of the side wall of the spray drying tank 3, on the opposite side of the air inlet pipe 31. On the air inlet pipe 31, an air inlet pneumatic valve 33 and an electric heating wire 34 are successively arranged in the front and back along the air inlet direction. The electric heating wire 34 is arranged inside the air inlet pipe 31. An air inlet temperature and humidity sensor 35 is provided at the connection between the air inlet pipe 31 and the spray drying tank 3. An exhaust pneumatic valve 36 is provided on the exhaust pipe 32. An exhaust temperature and humidity sensor 37 is provided at the connection between the exhaust pipe 32 and the spray drying tank 3. The air inlet pneumatic valve 33, the electric heating wire 34, the air inlet temperature and humidity sensor 35, the exhaust pneumatic valve 36, and the exhaust temperature and humidity sensor 37 are respectively electrically connected to the PLC controller.

[0023] After the drying process starts, the atomizer 1 performs high-speed centrifugal rotation inside, atomizes the liquid medicine, and sprays it out from the lower end outlet. At the same time, the first heat exchange system and the second heat exchange system are started to respectively monitor and cool the temperature inside and outside the atomizer 1.

[0024] The working principle of the first heat exchange system is as follows: The oil outlet temperature detection probe 17 sends temperature information to the PLC controller. When it monitors that the temperature of the heat-conducting oil at the outlet is higher than the preset standard value, the PLC controller controls the opening degree of the first pneumatic valve 15 to increase and the operating power of the first radiator 14 to increase, so as to accelerate heat dissipation. When the temperature of the heat-conducting oil at the outlet reaches the preset dangerous value, the PLC controller controls the first alarm 16 to give an alarm. After the alarm lasts for more than the preset time, the PLC controller controls the atomizer 1 to stop immediately.

[0025] The working principle of the second heat exchange system is as follows: The inlet water temperature detection probe 26 and the outlet water temperature detection probe 27 respectively detect the temperature from the upper and lower parts of the constant temperature device cover 2 to ensure that the atomizer 1 inside the constant temperature device cover 2 is always in a low-temperature operating environment. When any of the above temperature detection probes detects that the temperature of the constant temperature device cover 2 is higher than the preset standard value, the PLC controller controls the opening degree of the second pneumatic valve 24 to increase and the operating power of the second radiator 23 to increase. When it detects that the temperature of the constant temperature device cover 2 is higher than the preset danger level, the second alarm 25 gives an alarm. After the alarm lasts for more than the preset time, the PLC controller controls the atomizer 1 to stop immediately.

[0026] The working principle of the drying air supply system is as follows: The exhaust air temperature and humidity sensor 37 monitors the temperature and humidity of the drying gas in the exhaust air duct 32. When the temperature or humidity of the exhaust air duct 32 deviates from the preset value, the PLC controller controls the opening degree of the exhaust air pneumatic valve 36 to increase or decrease, changes the exhaust air flow rate, and thus adjusts the drying power to make the exhaust temperature and humidity of the drying gas return to the preset value. Since the action of the exhaust air pneumatic valve 36 will affect the working conditions of the upstream inlet air duct 31 at the same time, an inlet air temperature and humidity sensor 35 is set at the connection between the inlet air duct 31 and the spray drying tank 3 to monitor the change of the inlet air temperature and humidity of the drying gas. The PLC controller controls the electric heating wire 34 to increase or decrease the power and controls the opening degree of the inlet air pneumatic valve 33 to increase or decrease according to the deviation between it and the preset standard value. Through the synchronous adjustment of the inlet and exhaust air, the temperature and humidity of the whole process of drying hydroxyethyl starch are accurately controlled.

[0027] After drying is completed, the pipeline of the constant temperature device cover 2 can be disassembled and hoisted and moved, which is convenient for maintaining and servicing the constant temperature device cover 2, the atomizer 1 and the spray drying tank 3, and for refilling the atomizer 1 again.

[0028] In the first embodiment of the present utility model, after filling the atomizer 1 with the raw material liquid medicine to be processed, the spray drying process is started. After the raw material liquid medicine is used up, the machine is stopped and the raw material liquid medicine is added to the atomizer 1 again. Embodiment 2

[0029] Embodiment 2 is an optimized improvement of the hydroxyethyl starch spray drying automatic constant temperature device described in Embodiment 1, such asFigure 3 As shown, a liquid feed pipe 18 is installed on the side wall of the atomizer 1. An inlet pneumatic valve 19 is provided on the liquid feed pipe 18, and the inlet pneumatic valve 19 is electrically connected to the PLC controller. In the second embodiment, the liquid feed pipe 18 is used to convey the raw material liquid medicine to be dried to the atomizer 1, and there is no need to pre-load the raw material liquid medicine into the atomizer 1 in advance, so that the equipment can work continuously for a longer time. An inlet pneumatic valve 19 is provided on the liquid feed pipe 18, and the inlet pneumatic valve 19 is connected to the PLC controller to control the feeding speed. When the temperature of the atomizer 1 is on the high side, the opening degree of the inlet pneumatic valve 19 is reduced to reduce the feeding flow rate and the operating power of the atomizer 1. When the atomizer 1 stops running due to overheating, the inlet pneumatic valve 19 is completely closed.

[0030] In the second embodiment of the present utility model, the raw material liquid medicine is added to the atomizer 1 in real time through the liquid feed pipe 18, and the atomizer 1 keeps working, thus improving the production efficiency.

[0031] In the embodiments of the present utility model, the technical features not described in detail are all prior arts or conventional technical means, and will not be elaborated herein.

[0032] Finally, it should be noted that the above embodiments are only specific implementation manners of the present utility model, which are used to illustrate the technical solutions of the present utility model, rather than to limit it. The protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any person skilled in the art within the technical scope disclosed by the present utility model can modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model, and should all be covered within the protection scope of the present utility model.

Claims

1. An automatic constant temperature device for spray drying hydroxyethyl starch, comprising an atomizer (1), the atomizer (1) is installed at the opening on the top of the spray drying tank (3), and the lower part of the atomizer (1) extends into the spray drying tank (3), and it is characterized in that: The constant temperature device cover (2) is suspended above the atomizer (1), and the constant temperature device cover (2) can be vertically lifted and horizontally moved; the constant temperature device cover (2) is a bell-shaped structure with an inner / outer double-layer wall, and the inner layer wall and the outer layer wall form a sealed hollow structure. The upper part of the atomizer (1) is covered in the middle of the inner layer wall of the constant temperature device cover (2). Two pipeline interfaces are respectively arranged at opposite positions on the outer layer wall of the constant temperature device cover (2), and the two pipeline interfaces communicate with the hollow structure of the constant temperature device cover (2); the atomizer (1) is connected to the first heat exchange system, and the constant temperature device cover (2) is connected to the second heat exchange system through the two pipeline interfaces; a drying air supply system is arranged on the spray drying tank (3); temperature sensing and monitoring mechanisms and temperature automatic adjustment mechanisms are arranged on the atomizer (1), the first heat exchange system, the second heat exchange system, and the drying air supply system, and the temperature sensing and monitoring mechanisms and the temperature automatic adjustment mechanisms are electrically connected to the PLC controller.

2. The hydroxyethyl starch spray drying automatic constant temperature device according to claim 1, wherein: The first heat exchange system includes an oil inlet pipe (11) and an oil outlet pipe (12). One ends of the oil inlet pipe (11) and the oil outlet pipe (12) are respectively connected to both sides of the middle and lower part of the side wall of the atomizer (1); the other end of the oil inlet pipe (11) is connected to the outlet of the heat conduction oil tank (13), and the other end of the oil outlet pipe (12) is connected to the inlet of the first radiator (14). The outlet of the first radiator (14) is connected to the inlet of the heat conduction oil tank (13) through a pipeline; a first pneumatic valve (15) is arranged on the oil inlet pipe (11); a first alarm (16) is arranged on the outer wall of the oil outlet pipe (12); an oil outlet temperature detection probe (17) is arranged at the connection between the oil outlet pipe (12) and the atomizer (1); the first radiator (14), the first pneumatic valve (15), the first alarm (16), and the oil outlet temperature detection probe (17) are respectively electrically connected to the PLC controller.

3. The hydroxyethyl starch spray drying automatic constant temperature device according to claim 2, characterized in that: The second heat exchange system includes a water inlet pipe (21) and a water outlet pipe (22). One ends of the water inlet pipe (21) and the water outlet pipe (22) are respectively connected to the two pipeline interfaces of the constant temperature device cover (2). The water inlet pipe (21) is connected to the lower part of the outer layer wall, and the water outlet pipe (22) is connected to the upper part of the outer layer wall; the other end of the water inlet pipe (21) is connected to the outlet of the second radiator (23); the other end of the water outlet pipe (22) is connected to the inlet of the second radiator (23); a second pneumatic valve (24) is arranged on the water inlet pipe (21); a second alarm (25) is arranged on the outer wall of the water outlet pipe (22); a water inlet temperature detection probe (26) is arranged at the connection between the water inlet pipe (21) and the constant temperature device cover (2); a water outlet temperature detection probe (27) is arranged at the connection between the water outlet pipe (22) and the constant temperature device cover (2); the second radiator (23), the second pneumatic valve (24), the second alarm (25), the water inlet temperature detection probe (26), and the water outlet temperature detection probe (27) are respectively electrically connected to the PLC controller.

4. The hydroxyethyl starch spray drying automatic constant temperature device according to claim 1, characterized in that: The drying air supply system includes an air inlet duct (31) which is installed in the upper middle part of the side wall of the spray drying tank (3), and the height of the air inlet duct (31) is lower than the spray opening of the atomizer (1); an exhaust duct (32) is installed in the lower middle part of the side wall of the spray drying tank (3), on the opposite side of the air inlet duct (31); on the air inlet duct (31), an air inlet pneumatic valve (33) and an electric heating wire (34) are successively arranged in the front and back along the air inlet direction, and the electric heating wire (34) is arranged inside the air inlet duct (31); an air inlet temperature and humidity sensor (35) is arranged at the connection between the air inlet duct (31) and the spray drying tank (3); an exhaust pneumatic valve (36) is arranged on the exhaust duct (32); an exhaust temperature and humidity sensor (37) is arranged at the connection between the exhaust duct (32) and the spray drying tank (3); the air inlet pneumatic valve (33), the electric heating wire (34), the air inlet temperature and humidity sensor (35), the exhaust pneumatic valve (36) and the exhaust temperature and humidity sensor (37) are respectively electrically connected to the PLC controller.

5. The hydroxyethyl starch spray drying automatic constant temperature device according to any one of claims 1-4, characterized in that: The constant temperature device cover (2) is suspended above the atomizer (1) through a hoisting system. The hoisting system includes a chain block (41), and a lifting hook is arranged at the lower end of the chain block (41); a hanging hole is fixedly installed at the top of the constant temperature device cover (2), and the hanging hole is hung on the chain block (41) through the lifting hook; the upper end of the chain block (41) is connected to the traveling crane mechanism (42), and the traveling crane mechanism (42) is arranged on the bridge (43).

6. The hydroxyethyl starch spray drying automatic constant temperature device according to claim 1, characterized in that: A liquid feed pipe (18) is installed on the side wall of the atomizer (1), and a feed pneumatic valve (19) is arranged on the liquid feed pipe (18), and the feed pneumatic valve (19) is electrically connected to the PLC controller.

Images