Automatic control device of fermentation equipment

Abstract

The utility model discloses an automatic control device for fermentation equipment. A dissolved oxygen meter, a temperature transmitter, a PH detector and a liquid level relay are arranged in a fermentation tank; the PLC is in communication connection with the analog quantity input module; the dissolved oxygen meter, the PH detector and the temperature transmitter are respectively connected with the analog quantity input module; an automatic starting switch, an automatic stopping switch, a sterilization manual switch, a cooling manual switch, a fermentation manual switch and a liquid level relay are connected with the input end of a PLC. A steam generator, a steam valve, a hot water valve, a cold water valve, a feeding pump, an alkali liquor valve, a material supplementing valve, a defoaming valve and a stirring motor are connected to the output end of the PLC. And the voice broadcast device is in communication connection with the PLC through 485. The whole fermentation process flow is fully automatically controlled and connected in series, manual multi-time sectional operation is not needed, and the automation degree and the working efficiency are improved.

Description

Technical Field

[0001] The utility model relates to an automatic control device for fermentation equipment, belonging to the technical field of fermentation equipment. Background Art

[0002] The microbial fermentation steps are divided into sterilization, cooling, and fermentation. Sterilization is a very important link in the microbial fermentation system. Since harmful bacteria will be produced as the microorganisms continue to ferment, a sterilization process needs to be carried out after the fermentation of the fermentation tank is completed. The common sterilization method is to inject the steam generated by the steam generator into the fermentation tank for sterilization. Since the temperature in the tank is high during sterilization, it takes a long time to naturally drop to the temperature required for fermentation. Therefore, the fermentation equipment is equipped with a cooling process, which generally adopts the method of controlling the cold water valve to inject cold water for cooling. Fermentation is carried out after cooling is completed. The fermentation process requires process flows such as feeding control, fermentation temperature control, pH control, feeding, and defoaming control.

[0003] Existing fermentation equipment controls the sterilization, cooling, and fermentation processes separately, requiring each step to be manually controlled. Furthermore, the system requires predictable time and waiting for each process to complete before proceeding to the next step. This results in a low degree of automation, resulting in low efficiency and safety. Utility Model Content

[0004] The purpose of the utility model is to provide an automatic control device for fermentation equipment, which can fully automatically control the entire fermentation process in series without the need for manual multiple segmented operations, thereby improving the degree of automation and work efficiency.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A fermentation equipment automatic control device comprises: a programmable logic controller (PLC), an analog input module, a dissolved oxygen meter, a temperature transmitter, a pH detector, an automatic start switch, an automatic stop switch, a sterilization manual switch, a cooling manual switch, a fermentation manual switch, a liquid level relay, a steam generator, a steam valve, a hot water valve, a cold water valve, a feeding pump, an alkali solution valve, a feeding valve, a defoaming valve, a stirring motor, and a voice announcer; the dissolved oxygen meter, temperature transmitter, pH detector, and liquid level relay are installed in a fermentation tank; the PLC is communicatively connected to the analog input module; the dissolved oxygen meter, pH detector, and temperature transmitter are respectively connected to the analog input module; the automatic start switch, automatic stop switch, sterilization manual switch, cooling manual switch, fermentation manual switch, and liquid level relay are respectively connected to the input end of the PLC; the steam generator, steam valve, hot water valve, cold water valve, feeding pump, alkali solution valve, feeding valve, defoaming valve, and stirring motor are respectively connected to the output end of the PLC; and the voice announcer is connected to the PLC via 485 communication.

[0007] The purpose of this utility model can be further achieved by the following technical measures:

[0008] The aforementioned automatic control device for fermentation equipment, wherein the model of the PLC is Siemens CPU ST20, and the model of the analog input module is Siemens 6ES7288-3AE04-0AA0.

[0009] The aforementioned automatic control device for fermentation equipment, wherein the voice announcer is a mining explosion-proof and intrinsically safe type, model KXB127.

[0010] The aforementioned automatic control device for fermentation equipment, wherein the model of the dissolved oxygen meter is the joint measurement instrument SIN-DY3000, the model of the pH detector is the joint measurement instrument SIN-DC2000 / 2100, and the model of the temperature transmitter is the joint measurement instrument SIN-P202.

[0011] The aforementioned automatic control device for fermentation equipment, wherein the model of the steam generator is LDR54KW.

[0012] Compared with existing technologies, the present invention offers the following advantages: once all production preparations are complete, pressing the automatic start switch initiates the sterilization process. After sterilization, the process automatically cools down, and then automatically enters the fermentation process. After fermentation, a voice notification alerts the user. The present invention's automatic control device connects the entire fermentation process, eliminating the need for multiple manual operations. This high degree of automation enhances both efficiency and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is an electrical schematic diagram of an automatic control device for fermentation equipment of the present invention. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0015] like Figure 1As shown, the automatic control device of the fermentation equipment of the present invention includes: a PLC, an analog input module, a dissolved oxygen meter, a temperature transmitter, a pH detector, an automatic start switch, an automatic stop switch, a sterilization manual switch, a cooling manual switch, a fermentation manual switch, a liquid level relay, a steam generator, a steam valve, a hot water valve, a cold water valve, a feeding pump, an alkali solution valve, a feeding valve, a defoaming valve, a stirring motor, and a voice announcer; the dissolved oxygen meter, temperature transmitter, pH detector, and liquid level relay are installed in the fermentation tank; the PLC is communicatively connected to the analog input module; the dissolved oxygen meter, pH detector, and temperature transmitter are respectively connected to the analog input module; the automatic start switch, automatic stop switch, sterilization manual switch, cooling manual switch, fermentation manual switch, and liquid level relay are respectively connected to the input end of the PLC, and the steam generator, steam valve, hot water valve, cold water valve, feeding pump, alkali solution valve, feeding valve, defoaming valve, and stirring motor are respectively connected to the output end of the PLC; the voice announcer is connected to the PLC via 485 communication.

[0016] The fermentation equipment's automatic control system includes a Siemens CPU ST20 PLC and a Siemens 6ES7288-3AE04-0AA0 analog input module. The voice announcer is a KXB127 explosion-proof and intrinsically safe type for mining. The dissolved oxygen meter is a SIN-DY3000, the pH meter is a SIN-DC2000 / 2100, and the temperature transmitter is a SIN-P202. The steam generator is an LDR54KW.

[0017] According to the above automatic control device for fermentation equipment, its working process is as follows: after all production preparations are completed, press the start switch of the automatic process to start it with one button (the sterilization manual switch, cooling manual switch, and fermentation manual switch are only used during equipment debugging and maintenance). First, enter the first link for sterilization. After the sterilization is completed, it automatically enters the cooling process. After the cooling is completed, it automatically enters the fermentation process. After the fermentation is completed, the voice reminds the user to end. The details are as follows:

[0018] 1. Sterilization:

[0019] (1) The PLC output signal controls the operation of the remote steam generator (the PLC output signal is transmitted to the external operation enable terminal of the steam generator), and at the same time, the PLC output signal controls the opening of the steam valve;

[0020] (2) Steam circulates into the fermenter through the steam valve;

[0021] (3) When the temperature detected by the temperature transmitter inside the tank is greater than or equal to the set sterilization temperature, the timing starts and the voice announcer announces "Temperature reached, sterilization timing starts";

[0022] (4) When there are 5 minutes left in the sterilization countdown, the PLC controls the steam generator to shut down and slowly release the pressure (the steam generator does not produce steam after it is turned off, and the steam valve is still open to unload the tank pressure);

[0023] (5) When the sterilization time is reached, close the steam valve and enter the cooling control.

[0024] 2. Cooling control:

[0025] (1) The temperature transmitter is connected to the PLC analog input module. The output signal type of the temperature transmitter is 4-20mA. The actual data value read by the PLC is 5530-27648;

[0026] (2) After program calibration, 5530 corresponds to a temperature of -50°C, and 27648 corresponds to a temperature of 200°C;

[0027] (3) The current temperature value can be converted and calculated based on the data value currently collected and input;

[0028] (4) Set the fermentation temperature and buffer value in advance according to the fermentation process. That is, the fermentation tank temperature needs to be cooled to the fermentation temperature before fermentation can be carried out. However, due to the delay in temperature change, the buffer value is set. That is, when the temperature drops to the fermentation temperature + buffer value, the next process can be started. The default buffer value is 2°C.

[0029] (5) PLC controls the cold water valve to open and send in cold water for cooling;

[0030] (6) When the tank temperature drops to the target value (fermentation temperature + buffer value), close the cold water valve and enter fermentation control.

[0031] 3. Fermentation control:

[0032] The timer starts when the fermentation process begins and ends when the fermentation ends. The default time is 20 hours. Fermentation control includes:

[0033] 1. Turn on the feeding pump. The feeding process is controlled by time. When the time is up, turn off the feeding pump.

[0034] 2. Fermentation temperature control:

[0035] (1) The temperature transmitter output is connected to the PLC analog input module. The transmitter output signal type is 4-20mA. The actual data value read by the PLC is 5530-27648, corresponding to -50-200℃;

[0036] (2) PLC controls the hot water valve or cold water valve to adjust the temperature according to the current temperature and the set temperature;

[0037] (3) In order to adjust the temperature more accurately and prevent temperature overshoot, the following control method can be adopted: according to the temperature difference, set the water valve to a control cycle every 30 seconds, the opening time is 10-20 seconds, and the water valve is closed for the rest of the time for periodic adjustment.

[0038] 3. PH control:

[0039] (1) The output of the pH detector is connected to the PLC analog input module. The output signal type of the pH detector is 4-20mA. The actual data value read by the PLC is 5530-27648, corresponding to the pH value of 0-14;

[0040] (2) PLC controls the alkali solution valve to add alkali solution according to the current pH value and the set pH value;

[0041] (3) In order to adjust the pH value more accurately, the lye valve can be set to a control cycle of every 30 seconds according to the pH difference, with the opening time being 5-10 seconds and the valve closed for the rest of the time for periodic adjustment;

[0042] 4. As the microbial fermentation process consumes nutrient solution, the PLC controls the feeding by opening and closing the feeding valve according to the set time:

[0043] For example, the entire fermentation process can be divided into 5 time periods. Different fermentation varieties can have different feeding amounts. For example, different feeding amounts can be set for 1-2 hours, 3-4 hours, 5-6 hours, 7-8 hours, and 9-10 hours of fermentation.

[0044] 5. Defoaming control:

[0045] (1) Continuous stirring during the fermentation process will produce foam. A liquid level relay is installed to detect the liquid level. The monitoring point is higher than the normal liquid level. If foam is generated, the liquid level rises and triggers the liquid level relay alarm;

[0046] (2) If the liquid level relay alarms, the PLC opens the defoaming valve and adds defoaming liquid to remove the foam.

[0047] The PLC controls the stirring motor, which works from the beginning to the end of fermentation to stir the fermented material.

[0048] When the fermentation timer ends, it will automatically shut down and a voice message will be broadcast saying "Production is over, please take the material" to remind the user that production is over.

[0049] In addition to the above embodiments, the present invention may also have other implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A fermentation equipment automatic control device, characterized in that: include: PLC, analog input module, dissolved oxygen meter, temperature transmitter, pH detector, automatic start switch, automatic stop switch, sterilization manual switch, cooling manual switch, fermentation manual switch, liquid level relay, steam generator, steam valve, hot water valve, cold water valve, feeding pump, alkali solution valve, feeding valve, defoaming valve, stirring motor, voice announcer; the dissolved oxygen meter, temperature transmitter, pH detector, and liquid level relay are installed in the fermentation tank; the PLC is communicatively connected to the analog input module; the dissolved oxygen meter, pH detector, and temperature transmitter are respectively connected to the analog input module; the automatic start switch, automatic stop switch, sterilization manual switch, cooling manual switch, fermentation manual switch, and liquid level relay are respectively connected to the input end of the PLC, and the steam generator, steam valve, hot water valve, cold water valve, feeding pump, alkali solution valve, feeding valve, defoaming valve, and stirring motor are respectively connected to the output end of the PLC; the voice announcer is connected to the PLC via 485 communication.

2. The automatic control device for fermentation equipment according to claim 1, characterized in that: The model of the PLC is Siemens CPU ST20, and the model of the analog input module is Siemens 6ES7288-3AE04-0AA0.

3. The automatic control device for fermentation equipment according to claim 1, characterized in that: The voice announcer is a mine-use explosion-proof and intrinsically safe type, model KXB127.

4. The automatic control device for fermentation equipment according to claim 1, characterized in that: The model of the dissolved oxygen meter is SIN-DY3000, the model of the pH detector is SIN-DC2000 / 2100, and the model of the temperature transmitter is SIN-P202.

5. The automatic control device for fermentation equipment according to claim 1, characterized in that: The model of the steam generator is LDR54KW.

Images