A fully automatic closed acid-base adding system

Abstract

This invention discloses a fully automated closed-loop acid-base addition system. The fully automated closed-loop acid-base addition system includes: a main control unit, at least three liquid extraction units, at least three liquid delivery pipelines, and at least three target point distribution units, each disposed on a corresponding liquid delivery pipeline and electrically connected to the main control unit. These units are used to quantitatively distribute peracetic acid liquid, acidic liquid, and alkaline liquid to one or more target points according to instructions from the main control unit. At least three detection units are respectively disposed at each target point to monitor the liquid state at that point in real time and feed back the status signal to the main control unit. The main control unit automatically controls the start and stop of the liquid extraction units and target point distribution units based on the received status signal, enabling fully automated, closed-loop, and quantitative addition of acidic and alkaline liquids. This invention enables the automatic, precise, and safe addition of acid and alkaline liquids.

Description

Technical Field

[0001] This invention relates to the field of in-situ cleaning technology in the food and beverage industry, and in particular to a fully automatic closed-loop acid and alkali addition system. Background Technology

[0002] In the food and beverage production process, Cleaning in Place (CIP) is a crucial step in ensuring equipment hygiene and product quality. CIP cleaning typically involves circulating chemical cleaning agents such as acids and alkalis to clean the production equipment. Traditional acid and alkali addition methods often rely on manual operation, requiring operators to move the acid and alkali tanks to the addition point and manually open valves or pumps to add the substances.

[0003] This manual addition method has the following technical problems: First, manual operation makes it difficult to achieve accurate measurement, which can easily lead to material waste or substandard cleaning results, affecting the stability of the production process; Second, operators need to directly contact chemicals, posing a high safety and health risk; Third, manual operation is inefficient and difficult to coordinate with modern production lines, which is not conducive to the construction of digital factories; Fourth, the acid and alkali addition needs of multiple points and multiple equipment are difficult to manage in a unified manner, which can easily lead to problems such as untimely addition or pipeline cross-contamination.

[0004] As the food and beverage industry becomes increasingly stringent in its requirements for production environment and hazard analysis and critical control point management, there is an urgent need for a centralized, intelligent, and safe acid and alkali addition system to solve the aforementioned technical problems. Summary of the Invention

[0005] This invention provides a fully automatic closed-loop acid and alkali addition system to solve the technical problems of poor safety, insufficient accuracy, low efficiency, difficult management and poor scalability of the existing manual addition method, and can realize the automatic, accurate and safe addition of acid and alkali liquids.

[0006] According to one aspect of the present invention, a fully automatic closed-loop acid-base addition system is provided for in-situ cleaning in the food industry. The fully automatic closed-loop acid-base addition system includes: Main control unit; At least three liquid extraction units are electrically connected to the main control unit and are used to extract peracetic acid liquid, acidic liquid and alkaline liquid from the storage container, respectively. At least three liquid delivery pipelines are respectively connected to the outlet of the corresponding extraction unit, and are used to deliver peracetic acid liquid to a first designated container in the workshop, and to deliver acidic liquid and alkaline liquid to a second designated container in the workshop. At least three target point allocation units are respectively set on the corresponding liquid delivery pipelines and electrically connected to the main control unit, for quantitatively distributing peracetic acid liquid, acidic liquid and alkaline liquid to one or more target points according to the instructions of the main control unit; At least three detection units are respectively set at the target point to monitor the liquid state at the point in real time and feed back the state signal to the main control unit; The main control unit automatically controls the start and stop of the liquid extraction unit and the target point allocation unit according to the received status signal, so as to add the acidic liquid and the alkaline liquid in a fully automatic, closed and quantitative manner.

[0007] Optionally, the main control unit includes: Main control cabinet; The control panel, which is installed on the main control cabinet, is connected to the main control cabinet and is used to input control commands and display system status. The PLC control module is located in the main control cabinet and is used to connect with external stand-alone equipment. An internal network communication module is located in the main control cabinet and connected to the PLC control module, used for communication with external stand-alone devices.

[0008] Optionally, the main control unit further includes: The relay control module, located in the main control cabinet, is connected to the PLC control module. The PLC control module uses the relay control module to perform independent signal control on external single-unit devices. The manual operation button is provided on the relay control module. The manual operation button is used to manually start the equipment to maintain basic operation in an emergency situation where the PLC control module experiences a sudden malfunction or all signals are lost.

[0009] Optionally, the liquid extraction unit includes: A liquid suction assembly disposed at one end of the liquid storage container is used to extract liquid from the liquid storage container. A pneumatic pump, connected to the liquid suction assembly, is used to draw peracetic acid liquid, acidic liquid, and alkaline liquid from the liquid storage container. An air filter is provided, with its inlet connected to a compressed air source and its outlet connected to the control terminal of the liquid-pumping pneumatic pump. The air filter is used to start the liquid-pumping pneumatic pump.

[0010] Optionally, the liquid extraction unit further includes: A pump guard is installed outside the liquid-drawing pneumatic pump to provide physical protection in the event of a leak in the liquid-drawing pneumatic pump.

[0011] Optionally, the detection unit includes: The low liquid level alarm device installed in the liquid storage container is used to send an alarm signal to the main control unit when the liquid level is too low, prompting the operator to replace the empty liquid storage container in time. A target point request signal detector is set at the target point to detect whether the point needs to be replenished with liquid online and transmit the online detection signal to the PLC control module. The PLC control module automatically starts and stops the liquid pumping pneumatic pump according to the online detection signal and the set demand range. A volume range detector set at the target point is used to detect whether the added liquid volume has reached a preset value and transmit the volume range signal to the PLC control module. The PLC control module automatically stops the liquid pumping pneumatic pump after the preset value is reached, based on the volume range signal and the setting requirements.

[0012] Optionally, the target point allocation unit includes: The pneumatic shut-off valve at the target point on the liquid delivery pipeline is used to cut off the liquid delivery pipeline when it is not in operation, so as to prevent cross-connection between multiple points. A target point buffer tank is set at the target point for temporary storage of the dispensed liquid; The high and low liquid level detectors installed on the buffer tank at the target point are used to send a stop pumping signal to the PLC control module when the liquid level in the buffer tank at the target point reaches the high level. The PLC control module then controls the liquid pumping pneumatic pump to be turned off. When the liquid level reaches a low level, a request for pumping liquid is sent to the PLC control module, which then controls the start of the pneumatic pump.

[0013] Optionally, the fully automated closed-loop acid-base addition system also includes: A manual flushing unit connected to the liquid delivery pipeline or the liquid pumping pneumatic pump; The manual flushing unit includes a manual water flushing valve and a flushing pipeline, used to flush and clean the liquid delivery pipeline and the pump body of the liquid pumping pneumatic pump before maintenance.

[0014] Optionally, the PLC control module is also used to control the operation of the liquid pump and the target point pneumatic shut-off valve according to the input of the control operation screen or the signal of the high and low liquid level detector, so as to realize automatic addition mode, quantitative addition mode or manual addition mode.

[0015] Optionally, the main control unit further includes: The main power indicator light, abnormal alarm device and emergency control button are installed on the main control cabinet, and the main power switch and main power device are installed inside the main control cabinet; The main power indicator light is electrically connected to the main power device, and the main power switch is placed in the main power circuit; The abnormality alarm device is electrically connected to the main power supply device and is used to issue an alarm when the system is abnormal; The emergency control button is electrically connected to the main power supply and is used to cut off the system or perform emergency operations in an emergency. The main power supply device is electrically connected to the main power switch, the control panel, and the PLC control module. The main power supply device is used to provide power to all electrical equipment in the main control unit.

[0016] The technical solution of this invention provides a fully automated closed-loop acid-base addition system, particularly suitable for the automated, quantitative, and closed-loop addition of chemical cleaning agents such as peracetic acid, acidic liquids, and alkaline liquids in food and beverage production processes. The system supports three addition modes: automatic, quantitative, and manual. It can achieve multiple uses through internal network communication or wired signals, simplifying the operation process and improving production efficiency. Through precise automatic delivery and metering technology, it reduces material waste and unnecessary energy consumption, optimizes production operating costs, and improves energy efficiency. It has the ability to interconnect with workshop equipment, building an automated network to ensure precise and controllable addition processes, laying the foundation for digital factories and improving intelligence. It achieves human-machine isolation, significantly reducing the intensity of manual operations, fundamentally eliminating the safety and health risks associated with direct contact with chemicals, simplifying the entire chemical process management, and improving safety. In summary, this invention solves the technical problems of poor safety, insufficient precision, low efficiency, difficult management, and poor scalability inherent in existing manual addition methods, achieving automated, precise, and safe addition of acid and alkali liquids.

[0017] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0019] Figure 1 This is a schematic diagram of the overall structure of a fully automatic closed-loop acid-base addition system provided according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of a main control cabinet according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the external structure of a main control cabinet according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a liquid extraction unit according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a detection unit provided according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of a target point allocation unit provided according to an embodiment of the present invention. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0022] Figure 1 This is a schematic diagram of the overall structure of a fully automatic closed-loop acid-base addition system according to an embodiment of the present invention. (Refer to...) Figure 1 The present invention provides a fully automatic closed-loop acid-base addition system for in-situ cleaning in the food industry. The fully automatic closed-loop acid-base addition system includes: Main control unit 100; At least three liquid extraction units 200 are electrically connected to the main control unit 100 and are used to extract peracetic acid liquid, acidic liquid and alkaline liquid from the liquid storage container, respectively. At least three liquid delivery pipelines 16 are respectively connected to the outlet of the corresponding liquid extraction unit 200, and are used to deliver peracetic acid liquid to the first designated container in the workshop, and to deliver acidic liquid and alkaline liquid to the second designated container in the workshop. At least three target point distribution units 300 are respectively set on the corresponding liquid delivery pipelines 16 and electrically connected to the main control unit 100, for quantitatively distributing peracetic acid liquid, acidic liquid and alkaline liquid to one or more target points according to the instructions of the main control unit 100. At least three detection units 400 are respectively set at the target point to monitor the liquid state at the point in real time and feed back the state signal to the main control unit 100; The main control unit 100 automatically controls the start and stop of the liquid extraction unit 200 and the target point distribution unit 300 according to the received status signal, so as to add acidic and alkaline liquids in a fully automatic, closed and quantitative manner.

[0023] Specifically, the fully automated closed-loop acid-base addition system is used for the centralized, closed-loop, and automated addition of three chemical liquids: peracetic acid, acidic cleaning agents (such as nitric acid), and alkaline cleaning agents (such as sodium hydroxide). The system includes: a main control unit 100, at least three extraction units 200, at least three liquid delivery pipelines 16, at least three target point distribution units 300, and at least three detection units 400. The main control unit 100, as the system core, is electrically connected to all extraction units 200, distribution units 300, and detection units 400 to achieve centralized control. The main control unit 100, as the system's control core, is used to receive signals, perform logical operations, and issue control commands. The extraction units 200 are electrically connected to the main control unit 100 and are used to extract acid and alkali liquids from storage containers. The liquid delivery pipelines 16 are connected to the outlets of the extraction units 200 and are used to deliver the extracted acid and alkali liquids to the respective addition points.

[0024] The target point distribution unit 300 is installed on the liquid delivery pipeline 16 and electrically connected to the main control unit 100. It can quantitatively distribute acid and alkali liquids to one or more target points according to the instructions of the main control unit 100. The detection unit 400 is installed at each target point to monitor the liquid status at that point in real time and feeds back the status signal to the main control unit 100. Based on the received status signal, the main control unit 100 automatically controls the start and stop of all pumping units 200 and the target point distribution unit 300, thus forming a closed-loop control system to achieve fully automatic, closed-loop, and quantitative addition of acid and alkali liquids.

[0025] like Figure 1 As shown, this embodiment sets up three independent pumping units 200, corresponding to the peracetic acid storage tank, acid storage tank, and alkali storage tank, respectively. Three liquid delivery pipelines 16 are led out from the outlets of their respective storage containers and laid along the workshop cable trays to the target location area. The three liquid delivery pipelines 16 are connected to the outlets of their respective pumping units, used to deliver peracetic acid liquid to the first designated container in the workshop, and to deliver the mixed acidic liquid and alkali liquid to the second designated container in the workshop, respectively. The pipeline transportation is fully enclosed, with no chemical exposure, ensuring the safety of personnel and equipment. In this embodiment, the first designated container is the peracetic acid addition point, and the second designated container is the addition point for the mixed acid and alkali solutions; these can be configured as different tanks or pipelines in the CIP system according to actual process requirements.

[0026] Practical application verification has shown that this system can achieve fully automated operation of acid and alkali addition, eliminating the risk of chemical burns to operators who do not need to directly contact the chemicals. The system has successfully interconnected with multiple key pieces of equipment in the workshop (such as filling machines and sterilizers), automatically adjusting the addition amount according to the production cycle, reducing chemical usage by approximately 15% and manual operation time by over 90%. Simultaneously, the system has comprehensive alarm and emergency mechanisms, ensuring the continuity and safety of the production process.

[0027] In summary, the fully automatic closed-loop acid and alkali addition system provided by this invention, through the coordinated operation of the main control unit 100, the liquid extraction unit 200, the delivery pipeline 16, the target point allocation unit 300, and the detection unit 400, achieves fully automatic, closed-loop, and quantitative addition of acid and alkali liquids. It has achieved significant technical effects in terms of high efficiency, energy saving, intelligence, and safety, and has good prospects for industrial application.

[0028] The technical solution of this invention provides a fully automated closed-loop acid-base addition system, particularly suitable for the automated, quantitative, and closed-loop addition of chemical cleaning agents such as peracetic acid, acidic liquids, and alkaline liquids in food and beverage production processes. The system supports three addition modes: automatic, quantitative, and manual. It can achieve multiple uses through internal network communication or wired signals, simplifying the operation process and improving production efficiency. Through precise automatic delivery and metering technology, it reduces material waste and unnecessary energy consumption, optimizes production operating costs, and improves energy efficiency. It has the ability to interconnect with workshop equipment, building an automated network to ensure precise and controllable addition processes, laying the foundation for digital factories and improving intelligence. It achieves human-machine isolation, significantly reducing the intensity of manual operations, fundamentally eliminating the safety and health risks associated with direct contact with chemicals, simplifying the entire chemical process management, and improving safety. In summary, this invention solves the technical problems of poor safety, insufficient precision, low efficiency, difficult management, and poor scalability inherent in existing manual addition methods, achieving automated, precise, and safe addition of acid and alkali liquids.

[0029] Figure 2 This is a schematic diagram of the internal structure of a main control cabinet according to an embodiment of the present invention, with reference to... Figure 2 Optionally, the main control unit 100 includes: Main control cabinet 1; The control panel 2, which is installed on the main control cabinet 1, is connected to the main control cabinet 1 and is used to input control commands and display system status. PLC control module 8 is located in the main control cabinet 1 and is used to connect with external stand-alone equipment; The internal network communication module 9 is located in the main control cabinet 1 and connected to the PLC control module 8. It is used for communication with external stand-alone devices.

[0030] Specifically, the main control cabinet 1 is dustproof and waterproof, made of stainless steel, with an IP65 protection rating, and is installed in the chemical dosing room of the workshop. The control panel 2 is located on the front of the main control cabinet 1 and can be a 7-inch touchscreen. It is electrically connected to the PLC control module 8 inside the cabinet and is used for parameter setting, mode selection (automatic / quantitative / manual), real-time status monitoring, and historical data query. The PLC control module 8 can be a Siemens S7-1200 series PLC with built-in logic control programs, responsible for receiving signals from the detection unit, executing control logic, and exchanging data with other equipment in the workshop (such as filling machines and sterilizers). The internal network communication module 9 is connected to the PLC control module 8, supporting data exchange with external devices via the internal network or hardware cables, and online communication with external standalone devices (such as filling machines and sterilizers).

[0031] The internal network communication module 9 serves as a network interface and can be integrated into the PLC control module 8. It supports the Profinet industrial Ethernet protocol and, in conjunction with the standalone signal connection terminal 12, enables internal network communication between multiple mechanical devices, eliminating the need for cumbersome signal connections and providing convenience and speed. It possesses the ability to interconnect with workshop equipment, building an automated network to ensure precise and controllable processes, laying the foundation for a digital factory. It can interconnect with internationally renowned equipment (Tetra Pak, Sidel) and domestically renowned equipment (Baiguan, Xinmeixin, Zhongya, etc.).

[0032] Continue to refer to Figure 2 Optionally, the main control unit 100 further includes: The relay control module 10, located in the main control cabinet 1, is connected to the PLC control module 8. The PLC control module 8 uses the relay control module 10 to perform independent signal control on external single-unit equipment. The manual operation button 11 is provided on the relay control module 10. The manual operation button 11 is used to manually start the equipment to maintain basic operation in an emergency state where the PLC control module 8 experiences a sudden situation or all signals are lost.

[0033] Specifically, the relay control module 10 consists of multiple intermediate relays, whose coil terminals are connected to the output terminals of the PLC control module 8, and whose contact terminals are connected to various actuators (such as pneumatic pumps and pneumatic valves). Through relay isolation, the PLC control module 8 can perform independent signal control on newly added stand-alone equipment.

[0034] The manual operation button 11 is located on the panel of the relay control module 10. In extreme cases such as a failure of the PLC control module 8 or a complete communication loss, the operator can directly connect the relay using this button to force the start of the corresponding pneumatic pump for emergency replenishment. In the absence of power failure, the equipment can be manually started to maintain basic operation. The manual operation button 11 ensures emergency use in case of sudden situations or signal loss, guaranteeing production continuity.

[0035] Figure 3 This is a schematic diagram of the external structure of a main control cabinet according to an embodiment of the present invention, with reference to... Figure 3 Optionally, the main control unit 100 further includes: The main power indicator light 3, the abnormal alarm device 4 and the emergency control button 5 are installed on the main control cabinet 1; the main power switch 6 and the main power device 7 are installed inside the main control cabinet 1. The main power indicator light 3 is electrically connected to the main power device 7, and the main power switch 7 is set in the main power circuit. The abnormal alarm device 4 is electrically connected to the main power supply device 7 and is used to issue an alarm when the system is abnormal; Emergency control button 5 is electrically connected to main power supply unit 7 and is used to cut off the system or perform emergency operations in an emergency. The main power supply unit 7 is electrically connected to the main power switch 6, the control panel 2, and the PLC control module 8. The main power supply unit 7 is used to provide power to all electrical equipment in the main control unit 100.

[0036] Specifically, the main power supply unit 7 includes a switching power supply and a circuit breaker, providing DC 24V power to all electronic equipment in the main control cabinet 1. The main power switch 6 controls the power supply to the entire unit. The main power indicator 3 is green and stays on when the power supply is normal. The abnormal alarm device 4 can be an audible and visual alarm light, which will sound an alarm when abnormalities such as low liquid level, pump failure, or communication timeout are detected. The emergency control button 5 is a large red button; pressing it will cut off the power to all actuators, achieving an emergency shutdown.

[0037] The main power indicator light 3 is electrically connected to the main power supply unit 7 and is used to indicate the power status. The abnormal alarm device 4 (such as an audible and visual alarm) is electrically connected to the main control cabinet 1 and is used to issue an alarm when the system is abnormal. The emergency control button 5 is electrically connected to the main control cabinet 1 and is used to shut down the system or perform emergency operations in an emergency.

[0038] Figure 4 This is a schematic diagram of a liquid extraction unit according to an embodiment of the present invention, with reference to... Figure 4 Optionally, the liquid extraction unit includes: A liquid suction assembly 18 is provided at one end of the liquid storage container for extracting liquid from the liquid storage container. A pneumatic pump 13 is connected to a suction assembly 18 and is used to draw peracetic acid liquid, acidic liquid and alkaline liquid from a storage container. Air filter 15 has an inlet for connecting to a compressed air source and an outlet for connecting to the control terminal of liquid pump 13. Air filter 15 is used to start liquid pump 13.

[0039] Specifically, the liquid suction assembly 18 consists of a corrosion-resistant PTFE tube and a bottom valve, which is inserted into the bottom of the liquid storage container to ensure a stable liquid flow during extraction. The liquid suction pneumatic pump 13 is a pneumatic diaphragm pump with a pump body made of polypropylene (PP) and a diaphragm made of polytetrafluoroethylene (PTFE), which can withstand corrosion from strong acids, strong alkalis, and peracetic acid. The air filter 15 has a precision of 0.01μm and is connected between the main compressed air pipeline and the control air pipeline of the liquid suction pneumatic pump 13, providing clean and dry compressed air to the pump and ensuring stable operation.

[0040] Continue to refer to Figure 4 Optionally, the liquid extraction unit also includes: A pump guard 14 is installed outside the liquid pump 13 to provide physical protection in the event of a leak in the liquid pump 13.

[0041] Specifically, each pumping unit includes: a pumping assembly 18, a pumping pneumatic pump 13, an oil-free compressed air filter 15, and a pump protective cover 14. The pumping pneumatic pump 13 can be a corrosion-resistant pumping pneumatic pump, and the air filter 15 can be an oil-free compressed air filter. The pump protective cover 14 is a transparent acrylic cover that covers the outside of the pumping pneumatic pump 13. When a leak occurs in the pump body or pipeline, it can confine the leaked liquid inside the cover to prevent splashing, providing the first layer of physical protection, while also facilitating observation.

[0042] Figure 5 This is a schematic diagram of a detection unit according to an embodiment of the present invention, with reference to... Figure 2 , Figure 4 and Figure 5 Optionally, the detection unit includes: The low liquid level alarm device 19 installed in the liquid storage container is used to send an alarm signal to the main control unit when the liquid level is too low, prompting the operator to replace the empty liquid storage container in time. The target point request signal detector 20 is set at the target point to detect whether the point needs to be replenished with liquid online and transmits the online detection signal to the PLC control module 8. The PLC control module 8 automatically starts and stops the liquid pumping pneumatic pump 13 according to the online detection signal and the set demand range. The volume range detector 21, set at the target point, is used to detect whether the added liquid volume has reached the preset value and transmit the volume range signal to the PLC control module 8. The PLC control module 8 automatically stops the liquid pumping pneumatic pump 13 after the preset value is reached, according to the volume range signal and the setting requirements.

[0043] Specifically, the PLC control module 8 communicates with multiple target devices via internal network communication or wired signals, and can automatically start and stop the liquid-drawing pneumatic pump 13 according to the request signals of each target device. The target point display request signals include online detection signals and volume range signals. The PLC control module 8 controls the start and stop of the liquid-drawing pneumatic pump 13 according to the online detection signals or volume range signals.

[0044] This embodiment features a three-level detection unit to ensure accurate and safe system operation. The low liquid level alarm device 19 uses a float switch and is installed inside the raw liquid storage tank. When the liquid level is lower than the set value, the switch closes, the signal is transmitted to the PLC control module 8, triggering the abnormal alarm device 4 to sound an alarm, and the corresponding tank number is displayed on the control operation screen 2, prompting the operator to replace the empty tank.

[0045] The target point request signal detector 20 transmits the low liquid level signal detected in the high and low liquid level detectors 24 to the PLC control module 8. The PLC control module 8 treats the received low liquid level signal as a request to add liquid, and according to the preset priority and time interval, sequentially starts the corresponding liquid pumping pneumatic pump 13 and sends an opening command to the target point pneumatic shut-off valve.

[0046] The volumetric range detector 21 is an electromagnetic flowmeter installed on the liquid delivery pipeline, located between the outlet of the liquid-drawing pneumatic pump 13 and the pneumatic shut-off valve at the target point. The flowmeter feeds back the cumulative flow signal to the PLC control module 8 in real time. When the user selects the quantitative addition mode, the PLC control module 8 immediately shuts off the liquid-drawing pneumatic pump 13 and the corresponding pneumatic valve after the cumulative flow reaches the preset value, achieving high-precision quantitative addition with an error controllable within ±0.5%.

[0047] Optionally, the PLC control module is also used to control the operation of the liquid pump and the target point pneumatic shut-off valve according to the input of the control operation panel or the signal of the high and low liquid level detector, so as to realize the automatic addition mode, quantitative addition mode or manual addition mode.

[0048] Specifically, in automatic addition mode, the system automatically starts and stops based on the liquid level signal at the target point. When the liquid level in the buffer tank at a certain target point drops to a low level, the high / low level detector sends a request to add liquid to the PLC control module. The PLC control module, based on the priority of that point (e.g., acid addition has a higher priority than alkali addition) and the currently executing task, controls the system sequentially: opening the corresponding pneumatic shut-off valve at the target point; starting the corresponding pneumatic pump. Liquid flows from the storage tank through the suction assembly, the pneumatic pump, the liquid delivery pipeline, and the pneumatic shut-off valve into the buffer tank at the target point. When the liquid level rises to the set high level, the high / low level detector sends a "stop" signal, and the PLC control module shuts off the pneumatic pump and the pneumatic shut-off valve, completing one addition cycle.

[0049] In quantitative addition mode, the system adds liquid precisely according to the preset volume range. The operator selects "quantitative addition" on the control panel and enters the target volume value (e.g., 50L). After system startup, the volume range detector measures the volume in real time. When the cumulative flow reaches the set value, the PLC control module immediately shuts off the pneumatic pump and the pneumatic shut-off valve at the target point, achieving precise addition.

[0050] In manual addition mode, operators can intervene manually via the control panel or manual operation buttons. During debugging or when the automatic control system fails, operators can manually add components by using virtual buttons on the control panel or by directly operating the manual operation buttons on the relay control module to force the start of the specified pneumatic pump and corresponding valve.

[0051] Figure 6This is a schematic diagram of a target point allocation unit according to an embodiment of the present invention, with reference to... Figure 2 , Figure 3 , Figure 4 , Figure 6 Optionally, the target point allocation unit includes: The target point pneumatic shut-off valve 22, installed on the liquid delivery pipeline, is used to cut off the liquid delivery pipeline 16 when not in operation, to prevent cross-connection between multiple points. The target point buffer tank 23 is set at the target point and is used to temporarily store the dispensed liquid; The high and low liquid level detector 24 installed on the target point buffer tank 23 is used to send a stop pumping signal to the PLC control module 8 when the liquid level in the target point buffer tank 23 reaches the high level. The PLC control module 8 then controls the shut-off of the pumping pneumatic pump 13. When the liquid level reaches a low level, a request for pumping liquid is sent to the PLC control module 8, which then controls the start of the pumping pneumatic pump 13.

[0052] Specifically, the working process of the fully automatic closed-loop acid-base addition system is as follows: In automatic addition mode, when the liquid level in the buffer tank 23 at a certain target point drops to the low level, the high / low level detector 24 sends a pumping request signal to the PLC control module 8. Based on this signal, the PLC control module 8 controls the corresponding target point pneumatic shut-off valve 22 to open and starts the corresponding pumping pneumatic pump 13, transporting the chemical liquid in the storage container to the target point buffer tank 23 via the liquid delivery pipeline 16. When the liquid level in the buffer tank rises to the high level, the high / low level detector 24 sends a stop signal, and the PLC control module 8 shuts off the pumping pneumatic pump 13 and the target point pneumatic shut-off valve 22, completing one addition process.

[0053] In quantitative addition mode, the operator sets the required volume through the control panel 2. The volume range detector 21 monitors the addition volume in real time. When the set value is reached, the PLC control module 8 automatically stops the liquid pump 13, achieving precise addition.

[0054] In manual addition mode, the operator can directly control the start and stop of the liquid pump 13 through the control panel 2 or the manual operation button 11 for debugging or emergency situations.

[0055] This embodiment achieves independent control and anti-crosstalk at multiple points by setting up structures such as target point buffer tanks, high and low liquid level detectors, and target point pneumatic shut-off valves, ensuring stable and reliable system operation.

[0056] Continue to refer to Figure 4 Optionally, the fully automatic closed-loop acid-base addition system also includes: A manual flushing unit connected to the liquid delivery line 16 or the liquid pumping pneumatic pump 13; The manual flushing unit includes a manual water flushing valve and a flushing pipeline 17, which are used to flush and clean the liquid delivery pipeline 16 and the pump body of the liquid pumping pneumatic pump 13 before maintenance.

[0057] Specifically, to ensure maintenance safety, this system is equipped with a manual flushing unit at each pumping unit. The manual flushing unit includes a manual water flushing valve and pipeline 17. Its inlet is connected to the workshop's process water pipeline, and its outlet is connected to the outlet pipeline of the pumping pneumatic pump 13 via a tee, and is equipped with an independent discharge valve. Before maintenance, the operator first closes the bottom valve of the suction assembly 18, opens the manual water flushing valve, and uses process water to flush the pump body of the pumping pneumatic pump 13, the liquid delivery pipeline 16, and the buffer tank. The flushing fluid is discharged into the drain. Only after ensuring no chemical residue remains can subsequent disassembly and inspection work be carried out.

[0058] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A fully automatic closed-loop acid-base addition system, applied to in-situ cleaning in the food industry, characterized in that, include: Main control unit; At least three liquid extraction units are electrically connected to the main control unit and are used to extract peracetic acid liquid, acidic liquid and alkaline liquid from the storage container, respectively. At least three liquid delivery pipelines are respectively connected to the outlet of the corresponding extraction unit, and are used to deliver peracetic acid liquid to a first designated container in the workshop, and to deliver acidic liquid and alkaline liquid to a second designated container in the workshop. At least three target point allocation units are respectively set on the corresponding liquid delivery pipelines and electrically connected to the main control unit, for quantitatively distributing peracetic acid liquid, acidic liquid and alkaline liquid to one or more target points according to the instructions of the main control unit; At least three detection units are respectively set at the target point to monitor the liquid state at the point in real time and feed back the state signal to the main control unit; The main control unit automatically controls the start and stop of the liquid extraction unit and the target point allocation unit according to the received status signal, so as to add the acidic liquid and the alkaline liquid in a fully automatic, closed and quantitative manner.

2. The fully automatic closed-loop acid-base addition system according to claim 1, characterized in that, The main control unit includes: Main control cabinet; The control panel, which is installed on the main control cabinet, is connected to the main control cabinet and is used to input control commands and display system status. The PLC control module is located in the main control cabinet and is used to connect with external stand-alone equipment; An internal network communication module is located in the main control cabinet and connected to the PLC control module, used for communication with external stand-alone devices.

3. The fully automatic closed-loop acid-base addition system according to claim 2, characterized in that, The main control unit also includes: The relay control module, located in the main control cabinet, is connected to the PLC control module. The PLC control module uses the relay control module to perform independent signal control on external single-unit devices. The manual operation button is provided on the relay control module. The manual operation button is used to manually start the equipment to maintain basic operation in an emergency situation where the PLC control module experiences a sudden malfunction or all signals are lost.

4. The fully automatic closed-loop acid-base addition system according to claim 1, characterized in that, The liquid extraction unit includes: A liquid suction assembly disposed at one end of the liquid storage container is used to extract liquid from the liquid storage container. A pneumatic pump, connected to the liquid suction assembly, is used to draw peracetic acid liquid, acidic liquid, and alkaline liquid from the liquid storage container; An air filter is provided, with its inlet connected to a compressed air source and its outlet connected to the control terminal of the liquid-pumping pneumatic pump. The air filter is used to start the liquid-pumping pneumatic pump.

5. The fully automatic closed-loop acid-base addition system according to claim 4, characterized in that, The liquid extraction unit also includes: A pump guard is installed outside the liquid-drawing pneumatic pump to provide physical protection in the event of a leak in the liquid-drawing pneumatic pump.

6. The fully automatic closed-loop acid-base addition system according to claim 4, characterized in that, The detection unit includes: The low liquid level alarm device installed in the liquid storage container is used to send an alarm signal to the main control unit when the liquid level is too low, prompting the operator to replace the empty liquid storage container in time. A target point request signal detector is set at the target point to detect whether the point needs to be replenished with liquid online and transmit the online detection signal to the PLC control module. The PLC control module automatically starts and stops the liquid pumping pneumatic pump according to the online detection signal and the set demand range. A volume range detector set at the target point is used to detect whether the added liquid volume has reached a preset value and transmit the volume range signal to the PLC control module. The PLC control module automatically stops the liquid pumping pneumatic pump after the preset value is reached, based on the volume range signal and the setting requirements.

7. The fully automatic closed-loop acid-base addition system according to claim 6, characterized in that, The target point allocation unit includes: The pneumatic shut-off valve at the target point on the liquid delivery pipeline is used to cut off the liquid delivery pipeline when it is not in operation, so as to prevent cross-connection between multiple points. A target point buffer tank is set at the target point for temporary storage of the dispensed liquid; The high and low liquid level detectors installed on the buffer tank at the target point are used to send a stop pumping signal to the PLC control module when the liquid level in the buffer tank at the target point reaches the high level. The PLC control module then controls the liquid pumping pneumatic pump to be turned off. When the liquid level reaches a low level, a request for pumping liquid is sent to the PLC control module, which then controls the start of the pneumatic pump.

8. The fully automatic closed-loop acid-base addition system according to claim 4, characterized in that, Also includes: A manual flushing unit connected to the liquid delivery pipeline or the liquid pumping pneumatic pump; The manual flushing unit includes a manual water flushing valve and a flushing pipeline, used to flush and clean the liquid delivery pipeline and the pump body of the liquid pumping pneumatic pump before maintenance.

9. The fully automatic closed-loop acid-base addition system according to claim 7, characterized in that, The PLC control module is also used to control the operation of the liquid pump and the target point pneumatic shut-off valve according to the input of the control operation screen or the signal of the high and low liquid level detector, so as to realize the automatic addition mode, quantitative addition mode or manual addition mode.

10. The fully automatic closed-loop acid-base addition system according to claim 2, characterized in that, The main control unit also includes: The main power indicator light, abnormal alarm device and emergency control button are installed on the main control cabinet, and the main power switch and main power device are installed inside the main control cabinet; The main power indicator light is electrically connected to the main power device, and the main power switch is placed in the main power circuit; The abnormality alarm device is electrically connected to the main power supply device and is used to issue an alarm when the system is abnormal; The emergency control button is electrically connected to the main power supply and is used to cut off the system or perform emergency operations in an emergency. The main power supply device is electrically connected to the main power switch, the control panel, and the PLC control module. The main power supply device is used to provide power to all electrical equipment in the main control unit.

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