Novel stirring and concentrating device for online detection of residual weight of concentrated solution

Abstract

The invention relates to a novel stirring and concentrating device for online detection of the residual weight of a concentrated solution, and belongs to the technical field of pharmaceutical equipment. The device comprises an evaporation chamber, a heating jacket, a stirring motor, a condenser, a liquid accumulation tank and a controller. The improvement of the device is as follows: a weight online detector is arranged at the bottom of a support leg of the evaporation chamber, and a pipeline flexible connector is arranged on a steam pipeline, a feeding pipeline, a discharging pipeline, a cleaning pipeline and a gas circuit connecting pipeline, so that the interference of pipeline stress on weight measurement is eliminated. The evaporation chamber is also integrated with a temperature, vacuum and foam online detector; and the liquid accumulation tank is provided with a liquid level detector. All detection signals are accessed to the controller, and the steam valve, the vacuum valve, the feeding valve and the vacuum breaking valve are automatically adjusted by the controller, so that closed-loop control of the weight, the temperature, the vacuum degree, the foam and the liquid level in the concentration process is realized. According to the invention, the whole production process of the high-density concentrated solution is automatically and accurately controlled, the final density can reach 1.4 g / cm < 3 >, the stability is high, the manpower is effectively saved, and the product quality is improved.

Description

Technical Field

[0001] This invention relates to the technical field of stirring concentration, and in particular to a novel stirring concentration device for online detection of the remaining weight of the concentrate. Background Technology

[0002] In pharmaceutical concentration processes, the stability of the concentrated density in the later stages of concentration directly impacts the quality of the concentrated product. Each product has strict requirements for the density control of the concentrate. Conventional stirring concentration equipment, due to the presence of the stirring device, cannot install online level and density monitoring. The amount of material in the equipment must be manually monitored, and the feed rate and defoaming must be manually controlled. Shutting down the concentration machine requires an experienced operator to determine the appropriate shutdown time based on the appearance, flowability, and density measurements of the concentrate. This situation leads to poor product stability and an inability to accurately and consistently control product quality. Manual control of feed and defoaming results in issues such as untimely or excessive feed, and material leakage due to inadequate defoaming. Furthermore, the quantity of product discharged from the same batch varies each time, sometimes more, sometimes less, indicating instability. Therefore, improvements are needed to address the drawbacks of inconsistent quality during concentration.

[0003] To address the aforementioned shortcomings, this invention proposes an improvement. Summary of the Invention

[0004] The present invention proposes a novel online stirring and concentrating device for detecting the remaining weight of concentrated liquid, which is compact in structure, highly efficient in venting, reliable in sealing, and highly adaptable, and solves the above-mentioned problems existing in the use of the prior art.

[0005] The technical solution of this invention is implemented as follows: A novel online stirring and concentrating device for detecting the remaining weight of a concentrate, characterized in that it comprises: An evaporation chamber is provided with a heating jacket at the bottom, including an upper jacket and a lower jacket. A gas-liquid separator is connected to the upper part of the evaporation chamber, and a stirring motor, an exhaust valve, an online vacuum detector, an online foam detector, and an online temperature detector are provided. A steam inlet pipe is connected to the upper and lower jackets. The steam inlet pipe is equipped with a steam pneumatic angle seat valve, a steam pneumatic regulating valve, an online steam pressure detector, an upper jacket steam pneumatic angle seat valve, and a lower jacket steam pneumatic angle seat valve. A condenser connected to a vacuum tube, with a liquid collection tank at the bottom of the condenser; The vacuum tube is equipped with a vacuum pneumatic regulating valve; The liquid collection tank is equipped with an online liquid level detector, a negative pressure drainage centrifugal pump, and a vacuum-sealed check valve. The feed pipe is equipped with a pneumatic ball valve for feeding. The discharge pipe is equipped with a pneumatic ball valve for discharging material; The cleaning pipe is equipped with a pneumatic ball valve for cleaning. An online weight detector is installed at the bottom of the support legs of the evaporation chamber; The controller has its input terminals connected to the online steam pressure detector, online vacuum detector, online foam detector, online temperature detector, online liquid level detector, and online weight detector, and its output terminals connected to the online steam pneumatic regulating valve, online vacuum regulating valve, online steam pneumatic angle seat valve, upper jacketed online steam pneumatic angle seat valve, lower jacketed online steam pneumatic angle seat valve, feed pneumatic ball valve, discharge pneumatic ball valve, exhaust valve, cleaning pneumatic ball valve, stirring motor, and negative pressure drainage centrifugal pump. Flexible pipe connections, including flexible connections for discharge pipes, steam condensate pipes, steam pipes, feed pipes, cleaning pipes, and pipes connecting the equipment's evaporator chamber and condenser, are used to reduce the impact of pipelines on online weight measuring instruments.

[0006] Preferably, the online foam detector is installed on the top of the evaporation chamber, with its lowest point located above the stirring paddle, and does not affect the normal rotation of the stirring motor.

[0007] Preferably, the controller is equipped with a PID control loop, which is used to automatically adjust the opening of the steam pneumatic regulating valve and the vacuum pneumatic regulating valve according to the detection values ​​of the online steam pressure detector, online vacuum detector, online temperature detector and online weight detector, so as to control the steam pressure and vacuum degree.

[0008] Preferably, the drainage of the liquid collection tank is achieved by the negative pressure drainage centrifugal pump. When the online liquid level detector detects that the liquid level has reached the drainage set value, the controller starts the negative pressure drainage centrifugal pump to drain the liquid. After the drainage is completed, the vacuum seal is maintained by the vacuum sealing check valve.

[0009] Preferably, the online weight detector is used to detect the weight of the liquid medicine in the evaporation chamber in real time. When the weight reaches the set upper limit value, the controller closes the feed pneumatic ball valve; when the weight is lower than the set lower limit value, the controller opens the feed pneumatic ball valve to feed the medicine.

[0010] Preferably, when the online foam detector detects that the foam exceeds a set value, the controller controls the exhaust valve to open to break up the foam.

[0011] Preferably, the device further includes a steam pressure alarm mechanism connected to the controller. When the online steam pressure detector detects that the pressure exceeds the alarm value, it triggers an alarm and closes the steam pneumatic regulating valve and the steam pneumatic angle seat valve.

[0012] In summary, the beneficial effects of the present invention are as follows: This invention discloses a novel online stirring and concentrating device for detecting the remaining weight of a concentrated liquid. A steam pressure detector on the steam inlet pipe monitors the steam pressure, an online foam detector monitors the liquid level (the level rises when the liquid foams), and an online temperature detector monitors the temperature. These readings are fed back to the controller, which adjusts the heating steam rate and vacuum level by regulating the steam pneumatic regulating valve and the vacuum valve. This results in more stable foaming and temperature control. A highly efficient and simplified automatic drainage device is included, eliminating the need to disrupt the equipment's balance during drainage, and featuring a simple structure. Online weight detection allows for precise automatic control of the feed rate without human intervention. Precise control of density and weight during shutdown also eliminates the need for manual inspection, making the device easily usable by ordinary employees and eliminating the need for specialized personnel. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of a novel online stirring and concentrating device for detecting the remaining weight of a concentrate in this embodiment.

[0015] The detailed embodiments are explained below with reference numerals in the accompanying drawings: 1. Flexible connection for discharge pipe; 2. Flexible connection for steam condensate pipeline; 3. Flexible connection for steam pipes; 4. Flexible connection for feed pipe; 5. Clean the flexible pipe connections; 6. Flexible connection between the evaporator chamber and condenser pipes; 7. Online weight detector; 8. Evaporation chamber; 9. Gas-liquid separator; 10. Condenser; 11. Liquid collection tank; 12. Steam-operated pneumatic angle seat valve; 13. Steam pneumatic regulating valve; 14. Feed pneumatic ball valve; 15. Upper-jacketed steam-pneumatic angle seat valve; 16. Lower jacketed steam pneumatic angle seat valve; 17. Discharge valve; 18. Air vent valve; 19. Cleaning valve; 20. Vacuum regulating valve; 21. Online steam pressure monitoring instrument; 22. Online vacuum detector for evaporation chamber; 23. Online foam detector; 24. Online temperature monitoring instrument; 25. Online liquid level detector; 26. Negative pressure drainage centrifugal pump; 27. Agitator motor; 28. Steam inlet pipe; 29. Material inlet pipe; 30. Cleaning pipe; 31. Vacuum tube; 32. Heat the upper jacket; 33. Heating the lower jacket; 34. Discharge pipe.

[0016] The following will refer to the appendices in the embodiments of the present invention. Figure 1 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. Example

[0017] like Figure 1 As shown in the figure, this embodiment discloses a novel online stirring and concentrating device for detecting the remaining weight of a concentrated solution, which mainly includes the following main structure: like Figure 1 As shown, the pharmaceutical stirring and concentration device includes an evaporation chamber 8, a stirring motor 27 (the stirring motor has a stirring paddle), and a condenser 10. The evaporation chamber 8 has an upper heating jacket 32 ​​and a lower heating jacket 33 below it, used for heating the drug solution. To ensure even heating, a stirring device 27 is installed; the stirring is then turned on. To monitor the volume inside the evaporation chamber in real time, an online weight detector 7 is installed below the evaporation chamber. The signal is received by the controller input. When the weight reaches the set value x 1.105, the controller output closes the feed valve; when the weight falls below the set value x 0.095, the controller output opens the feed valve to allow feeding. After feeding is complete, the volume is concentrated to the set shutdown weight, and the machine stops precisely.

[0018] Material density calculation involves measuring the volume and density of the concentrated pharmaceutical solution to determine the remaining volume required to reach the desired density, which then allows for the calculation of the shutdown weight. To monitor and regulate the pressure of the heating steam in real time, a steam pressure detector 21 and a steam pneumatic regulating valve 13 are installed on the steam inlet pipe 28. The controller has a PID control loop: when the steam pressure is lower than the set value, the valve opening is increased; when the steam pressure is lower than the set value, the valve opening is decreased. When the steam pressure exceeds the alarm value, the steam regulating valve and the steam angle seat valve are closed. A foam detector 23 is also installed in the evaporation chamber 8. The signal is connected to the input terminal of the controller. When the foam exceeds the defoaming set value, the controller controls the venting valve (18) to open, thus venting and defoaming. The evaporation chamber 8 is equipped with an online temperature detector and an online vacuum detector. The signals are connected to the input terminal of the controller. The controller has a PID control loop. When the vacuum does not reach the set value, the vacuum regulating valve 20 is opened wider. When the vacuum exceeds the set value, the vacuum regulating valve is closed. When the vacuum is controlled at the set value, the temperature of the medicine solution is stable. When the vacuum degree is stable, there will be no foaming phenomenon, which effectively solves the foaming problem and ensures the quality of the medicine solution.

[0019] The liquid collection tank 11 is equipped with an online liquid level detector 25. The signal is connected to the controller input. When the liquid level reaches the drainage level, the controller controls the negative pressure drainage pump to pump water. When the liquid level is lower than the pump stop level, drainage stops. Drainage does not require puncturing the system or disrupting the vacuum balance within the equipment; drainage is performed directly. After the pump stops, a one-way valve 9 after the pump achieves a sealing effect, preventing vacuum leakage. The structure is simple to use, more convenient than traditional puncturing drainage methods, requires fewer materials and components, saves costs, and provides more efficient and stable equipment operation.

[0020] This pharmaceutical concentration unit achieves stable control over the concentration temperature, working liquid level, and discharge rate, maintaining a highly efficient and stable pharmaceutical concentration process. It prevents material from boiling over, foaming, and overflowing, ensuring a balanced production environment and achieving ideal intelligent temperature control with excellent performance. Introducing online weight detection allows for precise control of the amount of liquid within the equipment, ensuring stable discharge even during shutdown.

[0021] The present invention will be further described as follows: Figure 1 As shown, I. Device Structure This invention provides a novel online stirring concentration device for detecting the remaining weight of a concentrated liquid, mainly comprising an evaporation chamber 8, a condenser 10, a liquid collection tank 11, a controller 35, and pipelines and valves connecting each part. The evaporation chamber 8 is the core container for the concentration process, and its lower part is equipped with a heating jacket, including an upper jacket 32 ​​and a lower jacket 33, for indirectly heating the liquid with steam. To ensure uniform heating and prevent coking, a stirring motor is installed at the top of the evaporation chamber 8 to drive a stirring paddle for stirring.

[0022] The upper part of the evaporation chamber 8 is connected to the gas-liquid separator 9 via a flexible pipe connection 6, and the outlet of the gas-liquid separator 9 is then connected to the condenser 10. The secondary steam generated during evaporation is defoamed by the gas-liquid separator 9 and then enters the condenser 10 to be condensed. A liquid collection tank 11 is located at the bottom of the condenser 10 to collect the condensate. An online liquid level detector 25 is installed inside the liquid collection tank 11, and its bottom outlet is connected to the outside via a negative pressure drainage centrifugal pump 26. A vacuum-sealed check valve is installed after the pump.

[0023] To precisely control the concentration process, the equipment is equipped with a complete online monitoring system: 1. Weight detection: An online weight detector 7 is installed at the bottom of the support legs of the evaporation chamber 8 to directly and in real time measure the total weight of the evaporation chamber and the liquid inside.

[0024] 2. Process Parameter Monitoring: An online temperature detector 24, an online vacuum detector 22, and an online foam detector 23 are installed on the evaporation chamber 8. The online foam detector 23 is preferably installed at the top of the evaporation chamber, with its lowest detection point located above the agitator, to ensure accurate detection of the foam height on the liquid surface without interfering with the agitation.

[0025] 3. Steam pressure detection: An online steam pressure detector 21 is installed on the steam inlet pipe 28.

[0026] 4. Flexible pipe connections: To eliminate interference from external pipes on the high-precision online weight detector 7, corresponding flexible pipe connections (1, 2, 3, 4, 5, 6) are provided on the steam inlet pipe 28, steam condensate drain pipe, feed pipe 29, discharge pipe 34, cleaning pipe 30, and the connecting pipe between the evaporation chamber 8 and the condenser 10.

[0027] All process pipelines in the unit are automatically controlled using pneumatic valves. The steam inlet pipe 28 is equipped with a steam pneumatic angle seat valve 12 (main pipe switch) and a steam pneumatic regulating valve 13 (pressure fine adjustment), and the steam entering the corresponding jacket is controlled by the upper and lower jacket steam pneumatic angle seat valves 15 and 16 respectively.

[0028] A pneumatic ball valve 14 is installed on the feed pipe 29.

[0029] The discharge pipe 34 is equipped with a discharge pneumatic ball valve 17.

[0030] A pneumatic ball valve 19 for cleaning is provided on the cleaning pipe 30.

[0031] The vacuum tube 31 is equipped with a vacuum pneumatic regulating valve 20, which is used to regulate the vacuum level of the system.

[0032] The evaporation chamber 8 is also equipped with an exhaust valve 18 for venting.

[0033] II. Automatic Control and Working Process All online monitoring instruments' signals are connected to the analog input (AI) terminal of the controller 35, while all pneumatic valves, stirring motors 27, and negative pressure drainage centrifugal pumps 26 are controlled by the digital output (DO) or analog output (AO) terminal of the controller 35.

[0034] The working process and control logic of the device are as follows: 1. Automatic Feed Rate Control: The controller 35 automatically controls the feed rate based on the signal from the online weight detector 7. When the weight of the liquid in the evaporation chamber is detected to be lower than the preset lower limit, the controller opens the feed pneumatic ball valve 14 to feed the liquid; when the weight reaches the preset upper limit, the feed valve closes. When the liquid is concentrated to the "stop weight" corresponding to the target density, the concentration process automatically stops, achieving a stable output rate.

[0035] 2. Steam Pressure and Temperature Control: The controller 35 has an internal PID control loop. The online steam pressure detector 21 feeds back the signal to the controller, which adjusts the opening of the steam pneumatic regulating valve 13 to stabilize the steam pressure at the set value, thereby indirectly controlling the heating intensity. Simultaneously, combined with feedback from the online temperature detector 24 and the online vacuum detector 22, the PID loop adjusts the vacuum pneumatic regulating valve 20 to precisely control the vacuum level and liquid temperature within the process requirements of the evaporation chamber. Stable vacuum and temperature are crucial to preventing excessive foaming of the liquid.

[0036] 3. Automatic foam dissipation: When the foam online detector 23 detects that the foam height exceeds the safety set value, the controller 35 immediately opens the exhaust valve 18 to briefly ventilate the evaporation chamber, thereby quickly eliminating the foam and preventing "material leakage".

[0037] Its detailed working principle and control process are as follows: 1. Installation of the detection unit and signal acquisition The online foam detector (23) is preferably a non-contact capacitive, microwave, or optical sensor, vertically mounted at the center or above the side of the top of the evaporation chamber (8). The lowest detection point of its probe is precisely set at a safe position between the normal liquid surface and the top of the stirring blade, ensuring that it can sensitively detect the rise of foam on the liquid surface without interfering with the rotating stirring blade. The detector continuously transmits the real-time monitored liquid surface / foam height analog signal (such as a 4-20mA current signal) to the analog input (AI) terminal of the controller (35).

[0038] 2. Control Logic and Threshold Judgment 3. In the human-machine interface (HMI) or host computer of the controller (35), the operator presets a foam safety setting value (H_alarm) based on the characteristics of the liquid and process experience. This setting value corresponds to a height that is higher than the normal boiling liquid level but lower than the critical point that may cause foam to enter the exhaust pipe.

[0039] Normal operating state: When the height value fed back by the foam online detector (23) is lower than H_alarm, the controller determines that it is in normal evaporation state, the exhaust valve (18) remains closed, and the system maintains working vacuum.

[0040] Foam Over-Limit Trigger Status: When the feedback height value continuously exceeds H_alarm for a preset delay time (e.g., 1-3 seconds), the controller determines that the foam has risen abnormally, posing a risk of "material runaway". The short delay is introduced to avoid malfunctions caused by normal fluctuations in the liquid level or signal interference.

[0041] 4. Automatic defoaming process Once the triggering conditions are met, the controller (35) immediately executes the following automatic defoaming procedure: a. Output control command: The digital output (DO) terminal of the controller (35) immediately sends an "open" signal to the exhaust valve (18). The exhaust valve (18) is usually a pneumatic ball valve or butterfly valve, which opens fully upon receiving the signal.

[0042] b. Void breaking and defoaming: The opening of the exhaust valve (18) allows the interior of the evaporation chamber (8) to be briefly connected to the atmospheric environment or a low-pressure venting line through this valve. The high vacuum in the system is instantly broken, and the pressure rises rapidly to near atmospheric pressure. This "vacuum breaking" effect can immediately suppress the violent boiling of the liquid, and the foam breaks and collapses rapidly due to changes in surface tension and internal vapor condensation, causing the liquid level to drop accordingly.

[0043] c. Venting Duration Control: To prevent prolonged venting from causing evaporation interruption, significant temperature fluctuations, or external contamination, the controller has an adjustable venting time (T_vent), typically 3 to 15 seconds. A timer is started simultaneously with opening the exhaust valve.

[0044] d. System recovery: When the evacuation time T_vent ends, the controller (35) automatically sends a "shutdown" signal, and the exhaust valve (18) closes. Subsequently, the controller, through its PID loop, commands the vacuum pneumatic regulating valve (20) to restart, so that the system vacuum level can be quickly and smoothly restored to the original process setting value, and the evaporation process continues.

[0045] 5. Advanced control and interlocking (optional optimization) To further optimize control, the system may include the following logic: Frequency Limit and Alarm: If the automatic defoaming program is triggered more than the set number of times (e.g., 3 times) within a short period of time (e.g., within 10 minutes), the controller can determine that it is a process abnormality (e.g., feeding too fast, steam pressure too high, or changes in material properties). In addition to continuing to execute defoaming, a high-level alarm will be triggered on the HMI to prompt the operator to intervene and check.

[0046] Interlock with heating control: At the moment of triggering defoaming, the controller can simultaneously output a command to temporarily close the steam pneumatic regulating valve (13) or briefly close the steam pneumatic angle seat valve (12) to reduce the heat load and assist the foam to dissipate quickly.

[0047] Alternative defoaming strategy: For materials that are prone to foaming, the program can be set to automatically execute a second round of defoaming if the foam exceeds H_alarm again in a very short time after a single defoaming, or switch to a mild evaporation mode of "reducing heating intensity - maintaining vacuum".

[0048] 6. Automatic condensate drainage: When the online level detector 25 in the condensate tank 11 detects that the liquid level has reached the high set value, the controller 35 starts the negative pressure drainage centrifugal pump 26 to drain the condensate; the pump stops when the liquid level drops to the low set value. The vacuum-sealed check valve after the pump ensures that the system vacuum balance is maintained during drainage and pump shutdown, without disrupting the overall vacuum environment for drainage, resulting in a simple and efficient structure.

[0049] 7. Safety Interlock: If the online steam pressure detector 21 detects that the pressure exceeds the safety alarm value, the controller 35 will interlock and close the steam pneumatic regulating valve 13 and the steam pneumatic angle seat valve 12 to ensure equipment safety.

[0050] III. Advantages of the Implementation Examples This invention, by integrating a high-precision online weight detector 7 and combining it with multiple flexible pipe connections, achieves for the first time direct and accurate online measurement of the material quality inside the tank in a concentration device with stirring, solving the problem of traditional methods being unable to perform online detection. Combined with comprehensive temperature, pressure, vacuum, foam, and liquid level detection, and closed-loop automatic control based on controller 35, the entire concentration process, from feeding, heating, evaporation, defoaming to discharge, is automated and precise.

[0051] This device is particularly suitable for pharmaceutical industries that have stringent requirements for the concentration endpoint density (up to 1.4 g / cm³), and can significantly improve the consistency of product quality, the stability and efficiency of the production process, and reduce reliance on operator experience.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A novel online stirring and concentrating device for detecting the remaining weight of a concentrated solution, characterized in that, include: Evaporation chamber (8), the lower part of which is provided with heating jacket, including upper jacket (32) and lower jacket (33), the upper part of which is connected to gas-liquid separator (9), and is provided with stirring motor (27), exhaust valve (18), vacuum online detector (22), foam online detector (23) and temperature online detector (24); A steam inlet pipe (28) is connected to the upper jacket (32) and the lower jacket (33). The steam inlet pipe (28) is equipped with a steam pneumatic angle seat valve (12), a steam pneumatic regulating valve (13), a steam pressure online detector (21), an upper jacket steam pneumatic angle seat valve (15), and a lower jacket steam pneumatic angle seat valve (16). A condenser (10) is connected to a vacuum tube (31), and a liquid collection tank (11) is provided at the bottom of the condenser (10). The vacuum tube (31) is equipped with a vacuum pneumatic regulating valve (20). The liquid collection tank (11) is equipped with an online liquid level detector (25), a negative pressure drainage centrifugal pump (26), and a vacuum-sealed check valve; The feed pipe (29) is equipped with a feed pneumatic ball valve (14); The discharge pipe (34) is equipped with a discharge pneumatic ball valve (17). The cleaning pipe (30) is equipped with a cleaning pneumatic ball valve (19). The online weight detector (7) is installed at the bottom of the support leg of the evaporation chamber (8); The controller (35) has its input end connected to the online steam pressure detector (21), online vacuum detector (22), online foam detector (23), online temperature detector (24), online liquid level detector (25), and online weight detector (7), and its output end connected to the online steam pneumatic regulating valve (13), online vacuum regulating valve (20), online steam pneumatic angle seat valve (12), upper jacketed online steam pneumatic angle seat valve (15), lower jacketed online steam pneumatic angle seat valve (16), feed pneumatic ball valve (14), discharge pneumatic ball valve (17), exhaust valve (18), cleaning pneumatic ball valve (19), stirring motor (27), and negative pressure drainage centrifugal pump (26); The flexible pipe connections include a discharge pipe connection (1), a steam condensate pipe connection (2), a steam pipe connection (3), a feed pipe connection (4), a cleaning pipe connection (5), and a connection between the equipment evaporator chamber and the condenser pipe (6), which are used to reduce the influence of the pipes on the online weight detector (7).

2. The stirring and concentrating apparatus according to claim 1, characterized in that: The foam online detector (23) is installed on the top of the evaporation chamber (8), with its lowest point located above the stirring paddle, and does not affect the normal rotation of the stirring motor (27).

3. The stirring and concentrating apparatus according to claim 1, characterized in that: The controller (35) is equipped with a PID control loop, which is used to automatically adjust the opening of the steam pneumatic regulating valve (13) and the vacuum pneumatic regulating valve (20) according to the detection values ​​of the steam pressure online detector (21), vacuum online detector (22), temperature online detector (24) and weight online detector (7) to control the steam pressure and vacuum.

4. The stirring and concentrating apparatus according to claim 1, characterized in that: The drainage of the liquid collection tank (11) is achieved by the negative pressure drainage centrifugal pump (26). When the liquid level online detector (25) detects that the liquid level has reached the drainage set value, the controller (35) starts the negative pressure drainage centrifugal pump (26) to drain the liquid. After the drainage is completed, the vacuum seal is maintained by the vacuum sealing check valve.

5. The stirring and concentrating apparatus according to claim 1, characterized in that: The online weight detector (7) is used to detect the weight of the liquid medicine in the evaporation chamber (8) in real time. When the weight reaches the set upper limit, the controller (35) closes the feed pneumatic ball valve (14); when the weight is lower than the set lower limit, the controller (35) opens the feed pneumatic ball valve (14) to feed the medicine.

6. The stirring and concentrating apparatus according to claim 1, characterized in that: When the foam online detector (23) detects that the foam exceeds the set value, the controller (35) controls the exhaust valve (18) to open to break up the foam.

7. The stirring and concentrating apparatus according to claim 1, characterized in that: The device also includes a steam pressure alarm mechanism connected to the controller (35). When the online steam pressure detector (21) detects that the pressure exceeds the alarm value, it triggers an alarm and closes the steam pneumatic regulating valve (13) and the steam pneumatic angle seat valve (12).

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