System and control method for continuous production of a liquid syrup

Abstract

A kind of system and control method for continuous production of liquid syrup, including sugar bag elevator, sugar bag elevator is connected with automatic unpacking machine by conveyor, unpacking machine is connected with sugar hopper;Refined white granulated sugar sugar discharge metering system is connected with sugar hopper, first sugar dissolving tank respectively;Purified water system is provided with air energy heating system, air energy heater is connected with first hot water inlet and metering system by hot water pump P0;First hot water inlet and metering system is connected with first sugar dissolving tank, first sugar dissolving tank is connected with first sugar syrup filter;First sugar syrup filter is connected with first sugar syrup buffer tank, one end of steam pipeline system is connected with first sugar syrup buffer tank, the other end is connected with steam generator;First sugar syrup buffer tank is connected with second sugar dissolving tank;One end of second hot water inlet and sag control system is connected with large hot water tank, the other end is connected to second sugar dissolving tank;Second sugar syrup buffer tank is connected with outlet syrup automatic canning system.The present application realizes the continuous and stable automatic production of liquid syrup.

Description

Technical Field

[0001] This invention relates to the field of liquid sugar production technology, and more specifically to a system and control method for continuous production of liquid syrup. Background Technology

[0002] Liquid sugar (whole sucrose syrup) is made from edible white sugar through refining, fine filtration, ultraviolet sterilization, and concentration. It is a new type of sugar that integrates innovation, energy saving, greenness, and environmental protection. It can replace refined white sugar in food processing, helping users simplify production processes, reduce production costs, and providing stable quality and food safety guarantees. It achieves full coverage of existing sugar sources, significantly reducing usage costs. The product quality is a qualitative improvement over traditional solid white sugar and greatly simplifies customer use.

[0003] It is suitable for various food industries such as catering, baking, beverages, and fillings, as well as users in bars, tea rooms, and residential kitchens. It can be used for products with unique flavor and color requirements, such as jams, pickles, sauces, tomato juice, and mustard; it can also be used as a substrate for industrial fermentation. For enterprise users, liquid sugar eliminates the need for a complex dissolving process and can be directly fed into the production line, thereby reducing manual operations, revolutionizing traditional processes, saving time and labor, and significantly reducing sugar costs.

[0004] Current liquid sugar production processes mostly employ multiple intermittent sugar-dissolving systems, which are sequentially fed to achieve continuous production. For example, a liquid sugar production workshop in China uses three intermittent sugar-dissolving production lines operating in rotation. Each production line uses an electric hoist to lift sugar bags one by one from the first layer to the second layer, and then manual labor is required to break the bags before feeding them in. This feeding method is time-consuming and requires a lot of manpower. The sugar hopper and the sugar-dissolving tank are connected by a screw conveyor. The sugar-dissolving tank requires high-temperature hot water to dissolve the sugar, and steam will enter the screw conveyor, causing the white sugar to clump together and become difficult to clean. The sugar-dissolving tank is a horizontal intermittent tank. Only after the sugar in one tank is dissolved and the syrup is discharged into the subsequent sugar storage tank can sugar and water be added to start dissolving a new tank of syrup. This production method is time-consuming and energy-intensive. The production of hot water and steam also uses gas furnaces for heating, which has high safety costs, high energy consumption, and a certain impact on the environment. These production methods are relatively traditional, and the overall equipment occupies a large space. Although the process is simple, the construction cost is high, the maintenance workload is also relatively large, and a lot of human resources are required. Summary of the Invention

[0005] In order to overcome the above technical defects, the purpose of this invention is to provide a system and control method for continuous production of liquid syrup. Unlike the previous intermittent cyclic production, this system and control method can realize continuous and stable automatic production of liquid syrup. The system has the characteristics of safety and reliability, high efficiency and stability, energy saving and environmental protection, and space saving.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A system for continuous production of liquid syrup includes a sugar bag elevator 1, which runs through workshop 1 to 3 floors. At the exit on the 3rd floor, it is connected to an automatic unpacking machine 2 installed on the 3rd floor via a conveyor. The outlet of the unpacking machine 2 is connected downward to the sugar hopper 5.1 on the 2nd floor of the workshop.

[0008] The refined white sugar unloading and metering system 5 is located on the first floor of the workshop. The refined white sugar unloading and metering system 5 is connected to the sugar hopper 5.1 upwards and to the primary sugar dissolving tank 7 downwards via pipes.

[0009] A purified water system 3 is installed on the third floor of the workshop. An air source heating system 4 is installed at the outlet of the purified water system 3. A hot water pump P0 is installed at the outlet of the air source heater 4. The hot water pump P0 is connected to the primary hot water inlet and metering system 6. The primary hot water inlet and metering system 6 is connected downwards to the primary sugar dissolving tank 7. Thus, both the sugar inlet and water inlet systems are connected to the top of the primary sugar dissolving tank 7.

[0010] The outlet of the primary syrup dissolving tank 7 is connected upwards to the inlet of the primary syrup filter 8 via a pipe; the outlet of the primary syrup filter 8 is connected downwards to the top inlet of the primary syrup buffer tank 10 via a pipe; one end of the steam pipeline system 9 is connected to the steam inlet of the primary syrup buffer tank 10, and the other end is connected to the steam generator; the outlet of the primary syrup buffer tank 10 is connected to the bottom inlet of the secondary syrup dissolving tank 11 via a pipe; one end of the secondary hot water inlet and sag control system 13 is connected to the large hot water tank, and the other end is connected to the inlet of the secondary syrup dissolving tank 11; the outlet of the secondary syrup buffer tank 12 is connected to the automatic syrup filling system 15 via a pipe; and the ultraviolet pipeline sterilizer 14 is installed on the pipeline between the secondary syrup buffer tank 12 and the automatic syrup filling system 15.

[0011] The sugar bag elevator 1 is a vertical lifting device, and the sugar hopper 5.1 is an inverted square cone-shaped storage hopper; the purified water system 3 is an independent water purification system, and the hot water pump P0 is connected to a large hot water tank of the primary hot water inlet and metering system 6 located on the 3rd floor of the workshop via a pipe. A syrup pump P1 is installed at the outlet of the primary sugar dissolving tank 7 and is connected upwards via a pipe to the inlet of the primary syrup filter 8 located on the 2nd floor of the workshop; the outlet of the primary syrup filter 8 is connected downwards via a pipe to the primary syrup buffer tank 10 located on the 1st floor of the workshop. The top inlet is connected to the outlet of the primary syrup buffer tank 10, which is connected to the bottom inlet of the secondary syrup dissolving tank 11 located on the first floor of the workshop by a pipe. The large hot water tank is located on the third floor of the workshop. The secondary syrup buffer tank 12 and the secondary syrup dissolving tank 11 are connected as one unit, and the two tanks are separated by a partition. The outlet of the secondary syrup buffer tank 12 is connected to the automatic syrup filling system 15 located on the first floor of the workshop by a pipe. The ultraviolet pipeline sterilizer 14 is installed on the pipeline between the secondary syrup buffer tank 12 and the automatic syrup filling system 15.

[0012] The sugar bag elevator 1 transports sugar bags from the 1st floor to the 3rd floor. A conveyor belt 1.1 is installed at the inlet of the sugar bag elevator 1 to transport white sugar bags into the sugar bag elevator 1. A conveyor belt 1.2 is installed at the outlet of the sugar bag elevator 1 to transport the sugar bags lifted to the 3rd floor into the automatic unpacking machine 2 at the rear.

[0013] The automatic unpacking machine 2 includes a conveying device 2.1, a guiding device 2.2, a cutting device 2.3, a dust removal device 2.4, an unpacking machine housing 2.5, a bag outlet device 2.6, and a material discharge device 2.7;

[0014] The conveying device 2.1 is an upward conveyor belt located at the front end of the inlet of the automatic unpacking machine 2. The end of the conveying device 2.1 is equipped with a guide device 2.2, which is connected to the body of the unpacking machine 2. A cutting device 2.3 is installed at the inlet of the body of the unpacking machine 2. A discharge device 2.7 is installed below the body of the unpacking machine 2, a dust removal device 2.4 is installed above the body, and a spiral bag discharge device 2.6 is installed at the rear of the body. The bottom of the discharge device 2.7 below the body is a sugar hopper 5.1.

[0015] The conveying device 2.1 feeds the sugar bag into the connected guiding device 2.2, which straightens the sugar bag and sends it straight into the body of the unpacking machine 2 at the rear. A cutting device 2.3 is installed at the inlet of the unpacking machine 2. The vertical blade of the cutting device 2.3 can cut the sugar bag open, and the white sugar inside flows out to the discharge device 2.7 at the bottom of the machine. The dust removal device 2.4 at the top of the machine can suck away the sugar powder. After the white sugar is unloaded, the empty bag is conveyed to the outside of the unpacking machine through the spiral bag discharge device 2.6 at the rear of the machine. The discharge device 2.7 at the bottom of the machine opens the valve to discharge the white sugar downward into the sugar hopper 5.1.

[0016] The white sugar unloading and metering system 5 has a sugar hopper 5.1 (2 layers) at the top. The sugar hopper 5.1 is located below the automatic unpacking machine 2. The lower part of the sugar hopper 5.1 is equipped with a material level detection element 5.2, and the upper part is equipped with a material level detection element 5.3. The material level detection element 5.2 is used to detect the low material level (empty) state of the sugar hopper 5.1, and the material level detection element 5.3 is used to detect the high material level (full) state of the sugar hopper 5.1. The lower part of the sugar hopper 5.1 is connected to the primary sugar dissolving tank 7 (1 layer) through a vertical pipe. A star feeder M0 (1 layer) and a solid particle flow meter CMF1 (1 layer) are installed on the pipe.

[0017] The star feeder M0 and the solid particle flow meter CMF1 are installed close to the primary sugar dissolving tank 7. This installation is to reduce the amount of hot air entering the pipeline and causing condensation water to mix with the sugar and form sugar lumps. In addition, when the white sugar falls, it can generate a downward airflow to carry the hot air back to the primary sugar dissolving tank 7. The star feeder M0 is driven by a variable frequency motor. The purpose of using the star feeder M0 here is to make the white sugar flow rate tend to be stable.

[0018] The water purification system 3 (3 layers) purifies tap water into purified water for production that meets drinking standards. The water purification system 3 includes a raw water tank 3.1, a raw water pump 3.2, a sand tank 3.3, a carbon tank 3.4, a precision filter 3.5, a high-pressure pump 3.6, a permeation membrane system 3.7, a pure water tank 3.8, and a water supply pump 3.10 connected in sequence. An ozone generator 3.9 is installed on the pure water tank 3.8.

[0019] Tap water (raw water) enters the raw water tank 3.1 (inlet tank), and is then pumped by the raw water pump 3.2 into the sand tank 3.3 and carbon tank 3.4 for primary filtration to reduce turbidity and remove odors and discoloration. It then enters the pre-filter 3.5 (J3218-GWG-4000) for secondary precision filtration to further remove residual particulate matter. Finally, the filtered water is pumped by the high-pressure pump 3.6 to the reverse osmosis membrane system 3.7 for high-pressure reverse osmosis treatment.

[0020] The reverse osmosis membrane system 3.7 is a four-stage filtration system consisting of four reverse osmosis filters. Each reverse osmosis filter is cylindrical, and the reverse osmosis filter element is installed in the reverse osmosis filter using a rolling technology. It can filter out chemical ions and small molecules such as bacteria, fungi, and viruses in the water, which are discharged with the wastewater. Only purified water molecules with a volume of less than 0.0001 microns and solvents are left to enter the next stage pure water tank 3.8. The pure water tank 3.8 is connected to an ozone generator 3.9, which releases ozone into the pure water tank 3.8 to disinfect the pure water once. The outlet of the pure water tank 3.8 is connected to a water supply pump 3.10 by a pipe. A pipeline-type ultraviolet sterilizer 3.11 is installed on the pipe to disinfect the pure water a second time before it is pumped out by the water supply pump 3.10 for use as production water.

[0021] The air source heater 4 (3 layers) is located at the outlet of the purified water system 3 and connected via a channel. The air source heater 4 heats the purified water from the purified water system 3. The working principle of the air source heater 4 is based on heat pump technology. It utilizes the physical phenomena of compression, expansion, condensation, and evaporation during the heat pump cycle to transfer heat energy from low-temperature air to high-temperature air, thereby achieving the heating purpose. The purpose of using the air source heater 4 is to replace traditional gas heaters or electric heaters, which is not only environmentally friendly, achieving zero emissions of harmful gases, but also significantly reduces production costs.

[0022] The primary hot water inlet and metering system 6 is equipped with a large water tank 6.1 (3 layers) at the top. A hot water pump P0 is installed between the inlet of the large water tank 6.1 and the outlet of the air source heater 4, connected by a pipeline. The hot water pump P0 is driven by a variable frequency motor. A level gauge L1 is installed on the outside of the large water tank 6.1 to guide the frequency converter controlling the hot water pump P0. A small water tank 6.2 (3 layers) is installed below the large water tank 6.1. During normal production, the small water tank 6.2 is full to ensure a constant downward pressure at the outlet of the small water tank, thus stabilizing the flow of hot water in the pipeline. The small water tank 6.2 is also connected to the primary sugar dissolving tank 7 by a vertical pipeline. A pneumatic regulating butterfly valve V1 (2 layers) is installed at the top of the pipeline, and a liquid electromagnetic flow meter F2 (2 layers) is installed at the bottom.

[0023] The primary sugar dissolving tank 7 is a sealed container with a cylindrical upper part and a conical lower part. A stirring motor M1 is installed on the top to drive the stirring device 7.1 inside the primary sugar dissolving tank 7. A primary syrup pump P1 (1st layer) is configured at the outlet of the primary sugar dissolving tank 7. The outlet of the primary syrup pump P1 is then connected to the inlet of the primary syrup filter 8 by a pipe.

[0024] The primary syrup filter 8 filters out coarse sand impurities from the primary syrup, making the primary syrup purer. The primary syrup filter 8 consists of three cylindrical filters 8.1.

[0025] Each cylindrical filter 8.1 has a filter screen 8.2 arranged along the inner wall, dividing the interior of the cylindrical filter 8.1 into two chambers: an inner chamber and an outer chamber. A sealing cap 8.3 is located at the top, which can be opened for maintenance. A feed pipe 8.4 is connected to the bottom of the inner chamber. All feed pipes of the cylindrical filters 8.1 are connected to the main feed pipe 8.5. Each feed pipe 8.4 is equipped with a feed valve 8.6. When the control system opens the feed valve 8.6, the syrup enters the inner chamber of the cylindrical filter 8.1 from bottom to top through the feed pipe 8.4, and then passes through the filter... The syrup enters the outer cavity through the mesh 8.2, and the particles are blocked in the inner cavity by the filter mesh 8.2. The pure syrup is discharged from the outer cavity through the discharge pipe 8.7 to the main discharge pipe 8.8. Each discharge pipe 8.7 is equipped with a discharge valve 8.9. The discharge pipes 8.7 of all the cylindrical filters 8.2 are connected to the main discharge pipe 8.8, and then flow to the next stage equipment from the main discharge pipe 8.8. Each cylindrical filter 8.1 works independently. A pressure detection device 8.10 is installed on the cylindrical filter 8.1. The pressure detection device 8.10 is set on the top of the cover plate of each cylindrical filter 8.1 to detect the syrup pressure in each filter device.

[0026] During normal operation, if a high pressure of syrup is detected inside the cylinder, it indicates that the filter screen is clogged, and filtration needs to be stopped for cleaning. After cleaning, the system waits for the next filtration cycle to begin. The cleaning water is supplied by the purified water system 3. After being pressurized by a booster pump 8.11, the cleaning water enters each cylindrical filter 8.1 through the main cleaning pipe 8.12. Each filter has a cleaning water inlet valve 8.14 installed on its bottom cleaning pipe 8.13. The internal spray cleaning pipe is pulled by a rotary motor 8.15 at the bottom of the filter, rotating around the filter screen 8.2. During cleaning, cleaning water is sprayed out through nozzles 8.16 on the spray pipe to clean the filter screen 8.2. When the primary syrup filter 8 starts working, each filtration device performs filtration in turn.

[0027] The outlet of the primary syrup filter 8 is equipped with a pipe that connects downwards to the syrup inlet of the primary syrup buffer tank 10.

[0028] The primary syrup buffer tank 10 is a cylindrical sealed tank placed on the first floor, with its bottom resting on a higher steel frame structure, placing it in a high position. A stirring motor M2 is installed on the top to drive the stirring device 10.1 inside the primary syrup buffer tank 10. A temperature sensor T1 is installed at the outlet of the primary syrup buffer tank 10 to detect the temperature of the outlet syrup. A steam pipe is connected to the tank.

[0029] The steam pipeline system 9 consists of an air-source steam generator 9.1 and steam pipes. Steam is generated by the air-source steam generator and enters the steam pipe of the primary syrup buffer tank 10. The steam pipe has three inlets, upper, middle and lower, that enter the primary syrup buffer tank 10. The pipes inside the primary syrup buffer tank 10 are in a ring shape. This structure is designed to heat the syrup in the tank evenly.

[0030] A pipe is connected to the bottom of the primary syrup buffer tank 10 to the bottom of the secondary syrup dissolving tank 11 located on the first floor. A pneumatic regulating butterfly valve V3 and an electromagnetic flow meter F2 are installed on the pipe. The primary syrup flows by gravity from the bottom of the primary syrup buffer tank 10 to the secondary syrup dissolving tank 11 along the pipe. This structure is adopted to ensure the stability of the syrup feed and to keep the syrup at a balanced and stable flow rate.

[0031] The secondary sugar dissolving tank 11 and the secondary syrup buffer tank 12 are integrated into one unit, separated by a partition. The lower part of the partition is sealed to the tank body, while the upper part is open, forming a tall and narrow structure. The secondary sugar dissolving tank 11 is bottom-feeded, and a stirring motor M3 is installed on the top of the secondary sugar dissolving tank 11 to drive the stirring device 11.1 inside the secondary sugar dissolving tank 11. A sag meter BX is installed at the bottom of the secondary sugar dissolving tank 11 near the syrup inlet to measure the sag of the syrup in real time. A hot water pipe is also connected to the bottom of the tank, which is connected to the large hot water tank 6.1.

[0032] The secondary hot water inlet and sag control system 13 consists of a hot water pipe connected at the top to the large hot water tank 6.1 and at the bottom to the secondary sugar dissolving tank 11 near the syrup inlet. A small water tank 13.1 acts as a buffer, similar to the small tank in the primary sugar dissolving tank, ensuring a stable flow of hot water within the pipe. A pneumatic regulating butterfly valve V4 is installed at the inlet of the hot water pipe to the secondary sugar dissolving tank 11. The sag meter BX and the hot water regulating valve V4 are positioned at the pipe outlet to allow for a faster response time. The sag meter BX is an Aituo CM-800α online refractometer, and the regulating valve is an SMC pneumatic control valve assembly. The secondary sugar dissolving tank 11 is designed with a slender, tall structure to allow the primary syrup and hot water to fuse in the shortest possible time, minimizing the lag in syrup fusion and ensuring the syrup reaches the required final sag value promptly and accurately.

[0033] The inlet of the secondary buffer tank 12 is the upper gap of the partition separating it from the secondary syrup dissolving tank 11. The outlet is located at the bottom side of the tank. The bottom surface of the tank slopes downwards from the partition side of the secondary syrup dissolving tank 11 towards the outlet of the secondary buffer tank 12. This structure allows the secondary syrup to flow by gravity to the outlet, preventing the syrup from solidifying and forming lumps at the bottom of the tank. The outlet of the secondary buffer tank 12 is connected to the secondary syrup pump P2 by a pipe. A pipeline-type ultraviolet sterilizer 14 is installed on the pipe for sterilizing the secondary syrup. After sterilization, the secondary syrup is pumped by the secondary syrup pump P2 to the outlet syrup automatic filling system 15 for filling, storage, and awaiting sale.

[0034] The various independent devices, detection elements, motors, frequency converters, valve actuators, and PLC main control module are electrically connected.

[0035] A control method for a system for continuous production of liquid syrup includes the following control steps;

[0036] Step 1: The PLC controller sends a start command to the controller of the sugar bag elevator 1, which sequentially starts the inlet conveyor belt 1.1; the main body of the sugar bag elevator and the outlet conveyor belt 1.2. The sugar bags are sent into the sugar bag elevator 1 through the inlet conveyor belt 1.1, transported from the 1st floor to the 3rd floor, and then sent to the automatic unpacking machine 2 (3rd floor) through the outlet conveyor belt 1.2 for unpacking.

[0037] Step 2: The PLC controller sends a start command to the automatic unpacking machine controller, starting the automatic unpacking machine 2. The bag discharging device 2.6, material discharging device 2.7, dust removal device 2.4, cutting device 2.3, guiding device 2.2, and conveying device 2.1 in the automatic unpacking machine are started sequentially to begin disassembling the sugar bags, separating the sugar from the broken bags. The sugar enters the sugar hopper 5.1. During normal production, the material level in the sugar hopper should always be above the low level to ensure a normal supply of sugar. The material level is detected by the signals from the detection elements 5.2 and 5.3 and transmitted to the PLC for judgment. Based on different material level conditions, the PLC controls the output module to perform corresponding control.

[0038] When the PLC determines that the material level is low (empty hopper), it stops feeding sugar and water.

[0039] When the PLC determines that the material level is in the middle (normal state), all processes proceed normally.

[0040] When the PLC determines that the material level is high (full hopper), the interlock will stop the front-end unpacking machine and sugar bag elevator.

[0041] When the PLC determines that there is an error signal, it stops the sugar and water feeding and interlocks to stop the operation of the front-end automatic unpacking machine 2 and the sugar bag elevator 1. At the same time, it sends an alarm signal to the control screen to remind the staff to check the working status of the sensors on site.

[0042] Step 3: The PLC controller connects the water purification system, air source heater, hot water pump frequency converter, automatic syrup filling system, and star feeder frequency converter in series via the Profinet bus for control.

[0043] The PLC controller sends a start command to the purified water system controller via the Profinet bus and monitors the flow rate of the purified water system 3. The purified water then enters the air source heater 4.

[0044] Step 4: The PLC controller sends a start command to the air source heater controller via the Profinet bus and monitors the hot water temperature at the outlet of the air source heater 4. The purified water is heated to 90°C by the air source heater 4 and then pumped into the large hot water tank 6.1 by the hot water pump P0. The level gauge L1 of the large water tank feeds back the actual measured level value to the PLC. The target level (%) of the large hot water tank is set in the WINCC parameter screen. The PLC controller gives the corresponding speed frequency to the frequency converter of the hot water pump P0 via the Profinet bus, controls the speed of the hot water pump P0 motor, keeps the hot water entering the large water tank 6.1 at a constant flow rate, and keeps the hot water level in the large water tank 6.1 at the set target level.

[0045] Step 5: The amount of granulated sugar and hot water entering the primary sugar dissolving tank 7 is set according to a certain ratio. This ratio is determined by the total flow rate and the sag value of the primary sugar syrup. The total flow rate of the primary sugar syrup is set according to the required output, and the sag value of the primary sugar syrup should generally be higher than the final required syrup sag value. By setting the target flow rate (T / h) and target sag value (BX%) of the primary sugar syrup in the WINCC screen, the PLC controller automatically calculates and provides the target flow rate values ​​of granulated sugar and water. The required flow rate of granulated sugar is given by the PLC, and after passing through the solid... After the particle flow meter CMF1 measures the flow, it feeds back the actual measured value to the PLC. The PLC controller controls the variable frequency speed regulation of the star feeder M0 via the Profinet bus to achieve the required sugar flow rate (T / h). The PLC sets the required hot water flow rate, and after the liquid electromagnetic flow meter F2 measures the flow, it feeds back the actual measured value to the PLC. The PLC controls the opening of the regulating butterfly valve V1 to achieve the required hot water flow rate (T / h). After the sugar and hot water enter the first-stage sugar dissolving tank, the PLC controller starts the stirring device 7.1 in the first-stage sugar dissolving tank to stir and fully mix and dissolve the two.

[0046] Step 6: The PLC controller sends a start command to the primary syrup pump control circuit, starting the primary syrup pump P1 to pump the syrup from the primary sugar dissolving tank outlet to the primary syrup filter 8 (2 layers);

[0047] Step 7: The PLC controller sends a start command to the automatic syrup filter controller to start the syrup filter. The syrup filter has 3 filter tanks. First, the feed valve of filter tank 1 is opened, and the syrup enters filter tank 1 for filtration. When the filter screen of filter tank 1 is detected to be blocked and filtration cannot continue, the feed valve of filter tank 1 is closed to stop feeding. At the same time, the feed valve of filter tank 2 is opened to allow the syrup to enter filter tank 2 for filtration. At this time, filter tank 1 starts to automatically clean its filter screen. After cleaning, it waits for the next feeding and filtration. In this way, the 3 filters work and clean their filter screens in sequence to achieve the continuity of syrup filtration. The filtered syrup flows down the pipeline to the first-stage syrup buffer tank 10.

[0048] Step 8: After the filtered primary syrup enters the primary syrup buffer tank 10, the PLC controller sends a start command to the control circuit of the stirring device motor of the primary syrup buffer tank to start the motor stirring, so that the heated primary syrup will not solidify or crystallize under the stirring of the stirring device 10.1.

[0049] Step 9: For the syrup in the primary syrup buffer tank, the target temperature (°C) of the primary syrup is set in the WINCC screen. After the temperature sensor T1 measures the temperature, the actual measured value is fed back to the PLC. The PLC controls the opening of the regulating butterfly valve V2 to control the steam flow rate in order to achieve the target temperature (°C).

[0050] Step 10: The heated primary syrup flows by gravity from the bottom of the primary syrup buffer tank 10 to the secondary sugar dissolving tank. The target syrup flow rate (T / h) is set in the WINCC screen. After the flow meter F2 measures the flow rate, the actual measurement value is fed back to the PLC. The PLC controls the opening of the regulating butterfly valve V3 to achieve the target flow rate (T / h). The method of controlling the syrup flow rate for feeding into the secondary sugar dissolving tank is used here to ensure the stability of the secondary syrup feeding and to provide the best initial value for adjusting the syrup sag in the next step.

[0051] Step 11: For the primary syrup entering the secondary sugar dissolving tank 11, the target sag of the syrup (BX%) is set in the WINCC screen. After the sag meter BX measures the syrup, the actual measured value is fed back to the PLC. The PLC controls the opening of the regulating butterfly valve V4 to allow hot water to enter the secondary sugar dissolving tank 11 and mix with the primary syrup. Since the sag of the primary syrup is higher than the final required syrup sag value, hot water is added again to the secondary sugar dissolving tank 11 to dilute and dissolve the primary syrup so that its sag value reaches the required final sag value.

[0052] Step 12: The PLC controller sends a start command to the control circuit of the motor of the stirring device of the secondary sugar dissolving tank, starts the motor stirring device, so that the final dissolved secondary syrup is uniformly stirred by the stirring device 11.1 of the secondary sugar dissolving tank, and then flows upward from the overflow port at the upper end of the partition of the secondary sugar dissolving tank 11 into the secondary buffer tank 12.

[0053] Step 13: The PLC controller sends a start command to the secondary syrup pump control circuit, starting the secondary syrup pump P2 to pump the secondary syrup from the outlet of the secondary syrup buffer tank through the pipeline ultraviolet sterilizer 14 to the outlet syrup automatic filling system 15.

[0054] Step 14: The PLC controller sends a start command to the controller of the pipeline ultraviolet sterilizer, starting the pipeline ultraviolet sterilizer to sterilize the secondary syrup with ultraviolet light.

[0055] A pipeline ultraviolet sterilizer is a device used to sterilize and disinfect liquids in pipelines. Syrups treated with ultraviolet sterilizers can achieve a removal rate of over 99.99% for various viruses and bacteria without changing the properties of the syrup, maintaining its original taste and color.

[0056] The PLC controller sends a start command to the automatic syrup filling system controller via the Profinet bus, starting the automatic syrup filling system to begin filling the final secondary syrup. The automatic syrup filling system consists of three independent filling machines placed in parallel. The outlet conveyor belt of each filling machine is connected to the main outlet conveyor belt. The flow rate of each filling machine, the cumulative flow rate of the entire filling system, and the cumulative number of fillings completed by the entire filling system can be monitored on the WINCC host computer, and reports can be automatically generated. This makes it convenient to statistically analyze the syrup production.

[0057] The beneficial effects of the present invention.

[0058] The system uses an elevator to transport sugar bags, which effectively solves the space utilization problem. In the past, the transportation methods for transporting goods from low to high were mostly belt conveyors or overhead cranes. Both methods have their advantages and disadvantages. Belt conveyors can transport continuously and efficiently, but require multiple machines to be combined and docked, occupying a large space. While overhead cranes solve the space utilization problem and can transport vertically, they cannot transport continuously. The vertical elevator combines the advantages of both, enabling more efficient transportation of sugar bags in a smaller space.

[0059] Because sugar dissolving machines require unpacking and unloading sugar bags before feeding sugar, traditional methods mostly involve manually opening the bags and unloading the sugar. During unloading, a large amount of sugar powder is generated and dispersed in the surrounding air. Prolonged exposure to such an environment can have adverse effects on the human body. The automatic unpacking machine used in this invention can save a lot of manpower and is more efficient. The sugar powder generated during unloading is also sealed inside the machine and disposed of by a special dust removal device.

[0060] In this invention, both the primary and secondary sugar-dissolving tanks are equipped with a buffer storage tank at the rear. This allows for a buffering and blending process of the freshly dissolved syrup, resulting in more uniform dissolution of the granulated sugar and maintaining a stable syrup flow rate. The hot water tank also employs a two-stage water storage system. This structure minimizes the impact of water flow disturbance when the hot water pump enters the primary large tank on the outlet flow of the secondary small tank, ensuring a more stable outlet flow and maintaining a constant inlet flow rate for the sugar-dissolving tank.

[0061] The primary syrup buffer tank and the secondary syrup dissolving tank are connected by a gravity-flow pipe, with the secondary dissolving tank using a bottom-feed method. A regulating valve on the gravity-flow pipe controls the syrup flow rate. These structural measures ensure smooth syrup flow, minimize interference from external factors on various parameters, and achieve continuous and reliable discharge from the secondary dissolving tank, providing a precise initial sag value for final syrup sag adjustment.

[0062] All hot water and steam in the process are provided by air source heat pumps. In the past, most processes used gas boilers, which were energy-intensive and polluted the surrounding air. The final syrup sterilization uses a pipeline ultraviolet sterilizer, which can reduce the toxicity to operators and save space compared to traditional ozone sterilization. Attached image description:

[0063] Figure 1 This is a schematic diagram of the process flow of the present invention.

[0064] Figure 2 This is a schematic diagram of the overall process structure of the present invention.

[0065] Figure 3 This is a schematic diagram of the electrical system connection of the present invention.

[0066] Figure 4 This is a schematic diagram of the sugar hopper level control process of the present invention.

[0067] Figure 5 This is a schematic diagram of the liquid level control process for the large water tank in this invention.

[0068] Figure 6 This is a schematic diagram of the primary syrup sag control process of the present invention.

[0069] Figure 7 This is a schematic diagram of the temperature control process for the primary syrup buffer tank of the present invention.

[0070] Figure 8 This is a schematic diagram of the secondary syrup sag control process of the present invention.

[0071] Figure 9 This is a schematic diagram of an automatic package unpacking machine.

[0072] Figure 10 This is a schematic diagram of a water purification system.

[0073] Figure 11 This is a schematic diagram of a primary syrup filter. Detailed Implementation

[0074] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0075] like Figures 1-11 As shown, a system and control method for continuous production of liquid syrup:

[0076] I. Sugar Bag Lifting, Conveying, and Unpacking System: Trucks transport the finished packaged refined white sugar to the sugar silo on the first floor of the production workshop. When syrup production begins, workers place sugar bags one by one onto the inlet conveyor belt 1.1 of the sugar bag elevator 1. The inlet conveyor belt 1.1 feeds the sugar bags into the sugar bag elevator 1. The sugar bag elevator 1 lifts the sugar bags from the first floor of the workshop to the third floor. The sugar bags are then fed into the automatic unpacking machine 2 via the outlet conveyor belt 1.2. The automatic unpacking machine 2 disassembles the sugar bags, separates the white sugar from the bags, and unloads the white sugar downwards into the sugar hopper 5.1.

[0077] II. Sugar Unloading and Metering System: Sugar enters the star feeder M0 through the sugar hopper 5.1 and flows downwards along the pipe. The real-time flow rate of sugar is controlled by adjusting the rotation speed of the star feeder M0. There is a solid particle flow meter CMF1 below the star feeder M0 to measure and provide feedback on the real-time flow rate of sugar, which guides the control of the rotation speed of the star feeder M0. Sugar enters the primary sugar dissolving tank 7 through the solid particle flow meter CMF1.

[0078] III. Purified water and air source heating system: Tap water enters the purified water system 3 on the 3rd floor of the workshop, is filtered and disinfected, and then becomes pure water. It then enters the air source heater 4 for heating, and the heated water is then pumped to the large water tank 6.1 by the hot water pump P0.

[0079] IV. Hot Water Inlet Metering System: Hot water is pumped by hot water pump P0 to the large water tank 6.1 and then enters the lower small water tank 6.2. From the small water tank, it flows down the pipeline into the primary sugar dissolving tank 7. The actual flow rate of hot water is controlled by adjusting the opening of the pneumatic regulating butterfly valve V1 on the pipeline. Below the pneumatic regulating butterfly valve V1, there is a liquid electromagnetic flow meter F2 used to measure and provide feedback on the real-time flow rate of hot water, which guides the control of the opening of the pneumatic regulating butterfly valve V1.

[0080] V. Primary Sugar Dissolving Tank: White sugar and hot water are introduced into the primary sugar dissolving tank 7 according to a certain ratio through the control system. Under the stirring action of the primary sugar dissolving tank stirring device 7.1, they are mixed into primary syrup, and then pumped upward into the primary syrup filter 8 through the primary syrup pump P1.

[0081] VI. Primary Syrup Filter: After entering the primary syrup filter 8, the primary syrup is filtered and then flows downward into the primary syrup buffer tank 10.

[0082] VII. Primary Syrup Buffer Tank and Steam Heating System: The primary syrup buffer tank 10 is used to temporarily store primary syrup. Since the temperature of the primary syrup will decrease after filtration, the saturation of the syrup will decrease, and the droop will also decrease, affecting the subsequent droop adjustment. Therefore, the primary syrup in the primary syrup buffer tank 10 needs to be heated by the steam pipeline system 9, and then flowed downwards by gravity into the secondary sugar dissolving tank 11 through the pipeline.

[0083] VIII. Secondary Sugar Dissolving Tank and Secondary Syrup Buffer Tank: The primary syrup enters the secondary sugar dissolving tank 11 at a sag higher than the final output syrup. The inlet of the secondary sugar dissolving tank 11 is connected to a secondary hot water inlet and sag control system 13. The hot water flow rate is controlled in real time by a pneumatic regulating butterfly valve V4 on the inlet pipe. The sag meter BX measures the syrup sag at the inlet in real time. This sag value guides the opening of the pneumatic regulating butterfly valve V4 to control the real-time flow rate of the hot water. The primary syrup is diluted with hot water to achieve the required final syrup sag. The secondary sugar dissolving tank 11 and the secondary syrup buffer tank 12 are connected as one unit and separated by a partition. The bottom surface of the secondary syrup buffer tank 12 slopes from top to bottom from the partition side of the secondary sugar dissolving tank 11 towards the outlet of the secondary buffer tank 12, allowing the secondary syrup to flow by gravity to the outlet.

[0084] IX. The outlet of the secondary buffer tank 12 is connected to the secondary syrup pump P2 via a pipeline. A pipeline-type ultraviolet sterilizer 14 is installed on the pipeline for sterilizing the secondary syrup. After sterilization, the secondary syrup is pumped by the secondary syrup pump P2 to the outlet syrup automatic filling system 15 for filling, storage, and awaiting sale.

[0085] An electrical control connection diagram for continuous production of liquid syrup is shown below. Figure 3 As shown:

[0086] The electrical control scheme consists of:

[0087] PLC system: The PLC is configured as an S7-300 (315-2PN / DP);

[0088] WinCC Host Computer Control System: The host computer monitoring software is a genuine WINCC 7.5;

[0089] Each piece of independent equipment: the sugar bag elevator is from Jiangsu Kaiwei, the automatic bag unpacking machine is from the German IDEAS brand, the sugar scale is from Guangxi Huaxing, the syrup filter is from Kunming Kelin, the syrup filling machine is from Shanghai Gaoguan, and the water purification system is from Angel.

[0090] Detection Unit: The level sensor is from Welltech, the sag gauge is from AT&T (Japan), the temperature sensor is from KATU, the material level sensor is from Omron (Omron) capacitive sensor, and the flow meter is from Mico (Mike).

[0091] Motors: Ordinary motors use well-known domestic brands such as Harbin Electric Machinery Factory and German SEW motors, while variable frequency motors use well-known domestic brands such as Harbin Electric Machinery Factory.

[0092] Inverters: All inverters are from the Japanese brand Yaskawa;

[0093] Valve actuators: All valves use the Japanese SMC brand.

[0094] The PLC system has five subroutines: sugar hopper level control program, large water tank level control program, primary syrup sag control program, primary syrup buffer tank temperature control program, and secondary syrup sag control program.

[0095] The PLC system is connected to the WinCC host computer system via an industrial Ethernet bus. The WinCC system is an object-oriented, operator-visualized operating program that can display the status of all equipment in the production system, data from each detection point, fault alarms, trend charts, and automatically generate reports. Operators can also control the start and stop of corresponding equipment, set the speed of variable frequency motors, and the opening degree of each valve through the host computer system. By switching between manual and automatic modes, the system can be switched from manual to automatic mode to achieve automated production.

[0096] The PLC system uses the Siemens CPU315-2PN / DP digital input module to collect and feed back the status signals (such as start, stop, fault, etc.) of various devices, motors, and detection units to the PLC program.

[0097] The PLC system uses the Siemens CPU315-2PN / DP digital output module to send different control commands to control the corresponding equipment, motors, and detection units.

[0098] The PLC system uses the Siemens SM331 analog input module to collect analog signals from each detection unit and feed them back to the PLC program.

[0099] The PLC system uses the Siemens SM332 analog output module to send different analog signals to control the speed of corresponding equipment or the opening degree of valves.

[0100] The PLC system communicates in series with each independent device and frequency converter via the PROFINET bus, quickly reads the required data through addressing, and can also control these devices accordingly.

[0101] as follows Figure 4 As shown, the sugar hopper level control is as follows: The sugar hopper 5.1 is equipped with a high level sensor 5.3 and a low level sensor 5.2. When the current level signal is detected, the sensor feeds back a switch status signal to the PLC. The PLC then determines the current level status. Assuming the signal is 1 when the level sensor detects a level and 0 when no level is detected, the following determination method applies:

[0102] Material level status Empty position There is information Full position Incorrect material level High level sensor 5.3 0 0 1 1 Low level sensor 5.2 0 1 1 0

[0103] When the PLC detects an empty hopper signal, it sends a stop signal to the frequency converter of the star feeder M0, stopping the motor of the star feeder M0. Simultaneously, it sends a 0% opening signal to the hot water pneumatic regulating butterfly valve V1 of the primary sugar dissolving tank, closing V1 and stopping water and sugar feeding. When the PLC detects a material present (intermediate material level) signal, all processes proceed normally. When the PLC detects a full hopper signal, it sends a stop signal to the automatic unpacking machine system 2, stopping its operation. Simultaneously, it interlocks and stops the operation of the front-end sugar bag elevator system 1. When the PLC detects an incorrect material level signal, it sends an alarm signal to the control screen, reminding personnel to check the sensor's operating status on-site. It also stops the motor of the star feeder M0, sends a 0% opening signal to the hot water pneumatic regulating butterfly valve V1 of the primary sugar dissolving tank, stops the automatic unpacking machine system 2, and stops the sugar bag elevator system 1.

[0104] as follows Figure 5 As shown, the liquid level control of the large hot water tank 6.1 is as follows: The target liquid level value (SP hot water level)% of the large hot water tank 6.1 is set on the control screen. The current process liquid level value (PV hot water level)% of the hot water tank is measured by the differential pressure level gauge L1 installed at the bottom of the hot water tank. The measured value is fed back to the PLC. After the PLC program uses the PI control algorithm to calculate, the given frequency is output to the frequency converter VFD2 of the hot water pump P0 to adjust the speed of the hot water pump P0, thereby controlling the amount of hot water entering the tank and keeping the liquid level of the large hot water tank 6.1 at the set target liquid level.

[0105] as follows Figure 6 As shown, the sag of the primary syrup is controlled as follows:

[0106] Definition of sag: Syrup sag is the percentage of dry solids in the syrup to the total weight of the syrup. The calculation formula is: sugar / (sugar + water)×100%.

[0107] Formula Calculation: Taking a final required sag value of 60 as an example, the sag of the first-grade syrup should be higher than this value, here set to 65. Then: M sugar / (M sugar + M water) × 100% = 65%. Let M sugar + M water be 100, that is, at a sag of 65, M sugar is 65, and M water is 100 - 65 = 35. The sugar-water weight ratio is: M sugar / M water = 65 / 35 = 13:7. Therefore, we only need to control the real-time flow rate of white sugar and water according to this ratio to obtain a first-grade syrup with a sag of 65. Based on the above, if the total target flow rate of the first-grade syrup is set to E (set), and the sag is set to BX (set), the real-time target flow rate of white sugar under this set value is M sugar (set), and the real-time target flow rate of hot water is M water (set).

[0108] Then we have: M sugar (set) + M water (set) = E (set) ①

[0109] Let M_sugar + M_water = 100...②

[0110] Then we have: M sugar = BX……..③

[0111] M_water = 100 - BX…④

[0112] M sugar / M water = BX / (100 - BX)...⑤

[0113] Let E(set) / 100 = K, and substitute it into equations ① and ②;

[0114] Then we have: M sugar (set) + M water (set) / M sugar + M water = k;

[0115] M sugar (set) + M water (set) = (M sugar + M water)k;

[0116] M sugar (set) + M water (set) = K·M sugar + K·M water

[0117] From the above formula, we can obtain: M sugar (set) = K·M sugar; M water (set) = K·M water;

[0118] Substituting equations ③ and ④, we have: M sugar (set) = K·BX……..⑥

[0119] M_water (set) = K·(100-BX)………⑦.

[0120] Real-time flow control of granulated sugar: The required real-time target flow rate (SP sugar flow rate) T / h of granulated sugar can be obtained from equation ⑥ above. The current process flow rate (PV sugar flow rate) T / h of granulated sugar is measured by a granulated sugar solid particle flow meter (CMF) installed on the discharge pipe. The measured value is fed back to the PLC. After calculation using a PI control algorithm, the PLC program outputs a given frequency to the frequency converter VFD1 of the star feeder M0 to adjust the speed of the star feeder and control the flow rate of granulated sugar to achieve the required target flow rate. The measurement principle of the solid particle flow meter is based on the physical principle of the Doppler effect. The sensor generates a microwave field inside the pipe, and the microwaves are reflected by the flowing particles inside the pipe. By calculating the changes in frequency and amplitude, the solid flow rate can be accurately measured. Non-flowing particles such as dust deposits are not included in the calculation.

[0121] Real-time hot water flow control: The required real-time target flow rate (SP hot water) T / h can be obtained from equation ⑦ above. The current hot water process flow rate (PV hot water) T / h is measured by the hot water flow meter F1 of the first-stage sugar dissolving tank installed on the hot water inlet pipe. The measured value is fed back to the PLC. After the PLC program calculates using the PI control algorithm, it outputs a 4-20mA signal to the actuator of the hot water regulating valve V1 of the first-stage sugar dissolving tank to adjust the opening of the regulating valve and control the flow rate of hot water to achieve the required target flow rate.

[0122] as follows Figure 7 As shown, the temperature control of the primary syrup buffer tank 10 is as follows: The target syrup temperature (SP temperature) ℃ is set on the control screen. The current outlet syrup temperature (PV temperature) ℃ is measured using the primary syrup buffer tank thermometer T1 installed at the bottom outlet of the primary syrup buffer tank. The measured value is fed back to the PLC. After calculation using the PI control algorithm, the PLC program outputs a 4-20mA signal to the actuator of the primary syrup buffer tank steam regulating valve V2 to adjust the valve opening and control the steam flow rate, ensuring that the syrup in the primary syrup buffer tank reaches the set target temperature value.

[0123] as follows Figure 8 As shown, the sag control of the secondary syrup:

[0124] Secondary sugar dissolving tank feed control: To ensure that the syrup entering the secondary sugar dissolving tank is stable and uniform, a primary buffer tank outlet regulating valve V3 and a primary buffer tank syrup flow meter F2 are installed on the pipeline between the primary syrup buffer tank and the secondary sugar dissolving tank. The target flow rate (SP primary syrup) T / h of primary syrup entering the secondary sugar dissolving tank can be set on the control screen. The primary buffer tank syrup flow meter F2 measures the current process flow rate (PV primary syrup) T / h of primary syrup entering the secondary sugar dissolving tank and feeds the measured value back to the PLC. After the PLC program uses the PI control algorithm to calculate, it outputs a 4-20mA signal to the actuator of the primary buffer tank outlet regulating valve V3 to adjust the opening of the regulating valve and control the flow rate of primary syrup, so that the primary syrup entering the secondary sugar dissolving tank reaches the set target flow rate.

[0125] Syrup droop control in the secondary dissolving tank: Two prerequisites are crucial for controlling the droop of the syrup in the secondary dissolving tank. First, the syrup entering the secondary dissolving tank must be as uniform and stable as possible; measures to ensure syrup stability have already been taken in the previous step. Second, the droop of the syrup entering the secondary dissolving tank should be slightly higher than the final required droop value, and maintained within a constant droop range. The proportional feeding control method of the sugar water in the primary dissolving tank also ensures that the syrup droop remains within a constant range. Based on these two conditions... ，By adding hot water again to the secondary sugar dissolving tank to dilute the primary syrup, the desired final sag value of the syrup can be obtained. A syrup sag meter BX installed at the bottom of the secondary sugar dissolving tank measures the current process sag value (PV sag) BX of the syrup in the secondary tank. The measured value is fed back to the PLC. After calculation using a PI control algorithm, the PLC program outputs a 4-20mA signal to the actuator of the hot water valve V4 in the secondary sugar dissolving tank. This regulates the opening of the valve, controlling the flow rate of hot water entering the secondary sugar dissolving tank, so that the syrup in the secondary tank reaches the set target sag value.

[0126] The purified water controller, air source controller, and automatic syrup filling controller are independently controlled devices. The PLC controller communicates and controls these three independent devices via the Profinet bus. It can read signals such as flow rate, temperature, and count, and can control the start and stop of the devices, realizing interlocking control between the devices, thereby enabling reasonable and effective monitoring of each device in the system.

[0127] The PLC controller can also monitor the two frequency converters of the hot water pump and the star feeder via the Profinet bus. By reading the frequency and status signals of the frequency converters and contacting the signals returned by each guidance sensor, the PLC program uses a PI regulation algorithm to adjust the frequency of the frequency converters, thereby controlling the water level of the large water tank and the flow rate of the white sugar.

Claims

1. A system for continuous production of liquid syrup, characterized in that, Includes a sugar bag elevator (1), which runs through the workshop from the 1st to the 3rd floor. At the exit of the 3rd floor, it is connected to an automatic unpacking machine (2) installed on the 3rd floor of the workshop via a conveyor. The outlet of the automatic unpacking machine (2) is connected downward to the sugar hopper (5.1) on the 2nd floor of the workshop. The white sugar unloading and metering system (5) is located on the first floor of the workshop. The white sugar unloading and metering system (5) is connected to the sugar hopper (5.1) upwards through a pipe and to the first-level sugar dissolving tank (7) downwards. A water purification system (3) is installed on the third floor of the workshop. An air source heater (4) is installed at the outlet of the water purification system (3). A hot water pump P0 is installed at the outlet of the air source heater (4). The hot water pump P0 is connected to the primary hot water inlet and metering system (6). The primary hot water inlet and metering system (6) is connected downwards to the primary sugar dissolving tank (7). Thus, the sugar inlet and water inlet systems are both connected to the top of the primary sugar dissolving tank (7). The outlet of the primary syrup dissolving tank (7) is connected upward to the inlet of the primary syrup filter (8) via a pipe; the outlet of the primary syrup filter (8) is connected downward to the top inlet of the primary syrup buffer tank (10) via a pipe; one end of the steam pipeline system (9) is connected to the steam inlet of the primary syrup buffer tank (10), and the other end is connected to the steam generator; the outlet of the primary syrup buffer tank (10) is connected to the bottom inlet of the secondary syrup dissolving tank (11) via a pipe; one end of the secondary hot water inlet and sag control system is connected to the large water tank (6.1), and the other end is connected to the inlet of the secondary syrup dissolving tank (11); the outlet of the secondary syrup buffer tank (12) is connected to the automatic syrup filling system (15) via a pipe; and the ultraviolet pipeline sterilizer (14) is installed on the pipeline between the secondary syrup buffer tank (12) and the automatic syrup filling system (15).

2. The system for continuous production of liquid syrup according to claim 1, characterized in that, The sugar bag elevator (1) is a vertical lifting device, and the sugar hopper (5.1) is an inverted conical storage hopper; the purified water system (3) is an independent water purification system, and the hot water pump P0 is connected to a large water tank (6.1) of the primary hot water inlet and metering system (6) located on the 3rd floor of the workshop through a pipe. A syrup pump P1 is configured at the outlet of the primary sugar dissolving tank (7) and is connected upward to the inlet of the primary syrup filter (8) located on the 2nd floor of the workshop through a pipe; the outlet of the primary syrup filter (8) is connected downward to the top of the primary syrup buffer tank (10) located on the 1st floor of the workshop through a pipe. The inlet and outlet of the primary syrup buffer tank (10) are connected by a pipe to the bottom inlet of the secondary sugar dissolving tank (11) located on the first floor of the workshop. The large water tank (6.1) is located on the third floor of the workshop. The secondary syrup buffer tank (12) and the secondary sugar dissolving tank (11) are connected as one unit, and the two tanks are separated by a partition. The outlet of the secondary syrup buffer tank (12) is connected by a pipe to the automatic syrup filling system (15) located on the first floor of the workshop. The ultraviolet pipeline sterilizer (14) is installed on the pipeline between the secondary syrup buffer tank (12) and the automatic syrup filling system (15).

3. The system for continuous production of liquid syrup according to claim 1, characterized in that, The sugar bag elevator (1) transports the sugar bags from the 1st floor to the 3rd floor. A conveyor belt (1.1) is configured at the entrance of the sugar bag elevator (1) to transport the white sugar bags into the sugar bag elevator (1). A conveyor belt (1.2) is configured at the exit of the sugar bag elevator (1) to transport the sugar bags lifted to the 3rd floor into the automatic unpacking machine (2) at the rear end. The automatic unpacking machine (2) includes a conveying device (2.1), a guiding device (2.2), a cutting device (2.3), a dust removal device (2.4), an automatic unpacking machine housing (2.5), a bag discharging device (2.6), and a material discharging device (2.7). The conveying device (2.1) is an upward conveyor belt located at the front end of the inlet of the automatic unpacking machine (2). The end of the conveying device (2.1) is equipped with a guide device (2.2). The guide device (2.2) is connected to the body of the automatic unpacking machine (2). A cutting device (2.3) is installed at the inlet of the automatic unpacking machine (2). A discharge device (2.7) is installed below the body of the automatic unpacking machine (2). A dust removal device (2.4) is installed above the body. A spiral bag discharge device (2.6) is installed at the rear of the body. The bottom of the discharge device (2.7) below the body is a sugar hopper (5.1).

4. The system for continuous production of liquid syrup according to claim 1, characterized in that, The white sugar unloading metering system (5) has a sugar hopper (5.1) at the top. The sugar hopper (5.1) is located below the automatic unpacking machine (2). A material level detection element one (5.2) is installed at the bottom of the sugar hopper (5.1), and a material level detection element two (5.3) is installed at the top. The material level detection element one (5.2) is used to detect the low material level of the sugar hopper (5.1), and the material level detection element two (5.3) is used to detect the high material level of the sugar hopper (5.1). The sugar hopper (5.1) is connected to the first-stage sugar dissolving tank (7) through a vertical pipe. A star feeder M0 and a solid particle flow meter CMF1 are installed on the pipe. The star feeder M0 and the solid particle flow meter CMF1 are installed close to the primary sugar dissolving tank (7), and the star feeder M0 is driven by a variable frequency motor.

5. The system for continuous production of liquid syrup according to claim 1, characterized in that, The water purification system (3) purifies tap water into purified water for production that meets drinking standards. The water purification system (3) includes a raw water tank (3.1), a raw water pump (3.2), a sand tank (3.3), a carbon tank (3.4), a precision filter (3.5), a high-pressure pump (3.6), a permeation membrane system (3.7), a pure water tank (3.8), and a water supply pump (3.10) connected in sequence. An ozone generator (3.9) is installed on the pure water tank (3.8). The permeation membrane system (3.7) is a four-stage filtration system consisting of four reverse osmosis filters, each of which is cylindrical. The outlet of the pure water tank (3.8) is connected to the water supply pump (3.10) by a pipe, and a pipe-type ultraviolet sterilizer (3.11) is installed on the pipe. The air-source heater (4) is placed at the outlet of the water purification system (3) and connected to the pipeline. The air-source heater (4) heats the water source purified by the water purification system (3).

6. The system for continuous production of liquid syrup according to claim 1, characterized in that, The primary hot water inlet and metering system (6) is equipped with a large water tank (6.1) at the top. A hot water pump P0 is installed between the inlet of the large water tank (6.1) and the outlet of the air source heater (4) and connected by a pipe. The hot water pump P0 is driven by a variable frequency motor. A level gauge L1 is installed on the outside of the large water tank (6.1) to guide the frequency converter controlling the hot water pump P0. A small water tank (6.2) is installed below the large water tank (6.1). The small water tank (6.2) is also connected to the primary sugar dissolving tank (7) by a vertical pipe. A pneumatic regulating butterfly valve V1 is installed at the top of the pipe and a liquid electromagnetic flow meter F1 is installed at the bottom.

7. The system for continuous production of liquid syrup according to claim 1, characterized in that, The first-stage sugar dissolving tank (7) is a sealed tank with a cylindrical upper part and a conical lower part. A stirring motor M1 is installed on the top to drive the stirring device (7.1) inside the first-stage sugar dissolving tank (7). A first-stage syrup pump P1 is configured at the outlet of the first-stage sugar dissolving tank (7). The outlet of the first-stage syrup pump P1 is then connected to the inlet of the first-stage syrup filter (8) by a pipe. The primary syrup filter (8) filters out coarse sand impurities in the primary syrup, making the primary syrup purer. The primary syrup filter (8) consists of three cylindrical filters (8.1). Each cylindrical filter (8.1) has a filter screen (8.2) arranged along the inner wall of the cylinder. The filter screen (8.2) divides the interior of the cylindrical filter (8.1) into two chambers, an inner chamber and an outer chamber. A sealing cap (8.3) is located at the top. A feed pipe (8.4) is connected to the bottom of the inner chamber. The feed pipes of the cylindrical filters (8.1) are centrally connected to the main feed pipe (8.5). Each feed pipe (8.4) is equipped with a feed valve (8.6). The cavity is connected to the main discharge pipe (8.8) through the discharge pipe (8.7). A discharge valve (8.9) is installed on each discharge pipe (8.7). The discharge pipes (8.7) of the cylindrical filter (8.1) are centrally connected to the main discharge pipe (8.8). A pressure detection device (8.10) is installed on the cylindrical filter (8.1). The pressure detection device (8.10) is set on the top of the cover plate of each cylindrical filter (8.1) to detect the syrup pressure in each filter device. The outlet of the primary syrup filter (8) is configured with a pipe that connects downward to the syrup inlet of the primary syrup buffer tank (10).

8. The system for continuous production of liquid syrup according to claim 1, characterized in that, The primary syrup buffer tank (10) is a cylindrical sealed tank placed on the first floor. Its bottom rests on a high steel frame structure, placing it in a high position. A stirring motor M2 is installed on the top to drive the stirring device (10.1) inside the primary syrup buffer tank (10). A temperature sensor T1 is installed at the outlet of the primary syrup buffer tank (10) to detect the temperature of the syrup at the outlet. A steam pipe is connected to the tank. The steam pipeline system (9) consists of an air-source steam generator (9.1) and a steam pipeline. The steam is generated by the air-source steam generator and enters the steam pipeline of the primary syrup buffer tank (10). The steam pipeline has three inlets, upper, middle and lower, which enter the primary syrup buffer tank (10). The pipeline inside the primary syrup buffer tank (10) is a ring. The bottom of the primary syrup buffer tank (10) is connected to a pipe leading to the bottom of the secondary sugar dissolving tank (11) located on the ground floor. A pneumatic regulating butterfly valve V3 and an electromagnetic flow meter F2 are installed on the pipe.

9. A system for continuous production of liquid syrup according to claim 8, characterized in that, The secondary sugar dissolving tank (11) and the secondary syrup buffer tank (12) are connected as one unit. The two tanks are separated by a partition. The lower part of the partition is sealed to the tank and the upper part is open. It has a tall and narrow structure. The secondary sugar dissolving tank (11) is bottom feeding. A stirring motor M3 is installed on the top of the secondary sugar dissolving tank (11) to drive the stirring device inside the secondary sugar dissolving tank (11). A plumb gauge BX is installed at the bottom of the secondary sugar dissolving tank (11) near the syrup inlet to measure the plumb of the syrup in real time. A hot water pipe is also connected to the bottom of the tank and is connected to the large water tank (6.1). The secondary hot water inlet and sag control system consists of a hot water pipe connected at the top to the large water tank (6.1) and at the bottom to the secondary sugar dissolving tank (11) near the syrup inlet. There is a small water tank (13.1) in the middle as a buffer. A pneumatic regulating butterfly valve V4 is installed at the inlet of the hot water pipe to the secondary sugar dissolving tank (11). The inlet of the secondary syrup buffer tank (12) is the upper gap of the partition that separates it from the secondary sugar dissolving tank (11). The outlet is located at the bottom of the side of the tank. The bottom surface of the tank slopes from top to bottom from the partition side of the secondary sugar dissolving tank (11) toward the outlet of the secondary syrup buffer tank (12). The outlet of the secondary syrup buffer tank (12) is connected to the secondary syrup pump P2 by a pipe. An ultraviolet pipe sterilizer (14) is installed on the pipe for sterilizing the secondary syrup.

Images