Continuous sugar boiling vacuum-free automatic sugar discharging device

Abstract

The invention relates to the technical field of sugar making equipment, and discloses a continuous sugar boiling and vacuum-reduction-free automatic sugar discharging device which can realize automatic control of a sugar discharging process of a continuous sugar boiling tank, avoid tedious manual operation and relieve the burden of operators. The massecuite receiving box is separated into two cabins, the use amount of massecuite of liquid seal can be effectively reduced, waste is avoided, after the first cabin is separated from the second cabin, even if the massecuite in the second cabin is evacuated, the liquid seal of the first cabin is not affected, and vacuum in the continuous boiling tank is not affected; the automation of the sugar discharging process is realized by the two pneumatic valves mounted on the sugar discharging pipeline under the precise control of the PLC control unit. Compared with a traditional manual operation sugar discharging valve, automatic sugar discharging can more accurately control the time and flow of sugar discharging, the problems that sugar discharging is not uniform or too much or too little sugar is discharged are solved, and the product quality and the production continuity are further improved.

Description

Technical Field

[0001] The invention relates to the technical field of sugar making equipment, in particular to a device for continuously boiling sugar without reducing vacuum and automatically discharging sugar. Background Art

[0002] Sugarcane sugar mills typically use batch boiling tanks for sugar refining. In recent years, with the advancement of sugar refining technology, more and more sugar mills have begun adopting continuous boiling. Compared to batch boiling, continuous boiling offers unparalleled advantages, including a high degree of automation, low labor requirements, and low energy consumption. It is the future direction of sugar production.

[0003] Currently, continuous sugar boiling primarily uses a single-chamber method. The continuous boiling tank consists of multiple chambers. When sugar boiling begins, seeds enter the first chamber, flow through the remaining chambers, and exit the final chamber. During this process, molasses is continuously added and water evaporates, ultimately forming a thick massecuite that is continuously discharged to a massecuite receiver for further processing. To save energy, negative pressure must be maintained within the boiling tank during the cooking process to ensure the massecuite boils at a low temperature, allowing for good convection and uniform heating. However, the massecuite receiver is not sealed, and pressure differentials prevent direct unloading of massecuite into the receiver. A common practice is to pre-fill the receiver with massecuite before sugar boiling begins, without vacuum, to cover the opening of the sugar pipe. This pipe is then sealed with massecuite, and the vacuum is then activated for cooking. This ensures that both the boiling tank and the pipe are under negative pressure during cooking, preventing pressure from blocking the massecuite from being discharged and ensuring a stable vacuum.

[0004] The above method has two shortcomings: first, a large amount of massecuite needs to be placed in the massecuite receiving box in advance, resulting in waste; second, the massecuite receiving box needs to continuously pump the massecuite to the next process. If the massecuite level is not properly controlled, it may not cover the sugar pipe, causing air to enter the sugar boiling tank, reducing the vacuum degree in the tank and affecting the sugar boiling process.

[0005] Therefore, a device for continuously boiling sugar without reducing vacuum and automatically releasing sugar is proposed to solve the above problems by optimizing the equipment structure. Summary of the Invention

[0006] Technical problems solved

[0007] First, a large amount of massecuite needs to be placed in the massecuite receiving box in advance, resulting in waste. Second, the massecuite receiving box needs to continuously pump the placed massecuite to the next process. If the control is not good, the massecuite liquid level cannot cover the sugar pipe, causing air to enter the sugar boiling tank, reducing the vacuum degree in the tank and affecting the sugar boiling.

[0008] Technical Solution

[0009] To achieve the above-mentioned solution, the present invention provides the following technical solution: a device for continuous sugar boiling without vacuum reduction and automatic sugar discharge, the device mainly comprising a continuous sugar boiling tank, a massecuite receiving box, a sugar discharge pipeline, a liquid level monitoring system, a valve control system and a PLC control unit.

[0010] The upper and lower parts of the sugar discharging pipeline are respectively connected to the continuous sugar boiling tank and the sugar paste receiving box. The sugar discharging pipeline is equipped with a first sugar discharging valve and a second sugar discharging valve.

[0011] A partition is fixedly installed at the bottom of the massecuite receiving box, which divides the massecuite receiving box into a first compartment and a second compartment. The outer bottom of the massecuite receiving box is connected to a massecuite pump.

[0012] In the liquid level monitoring system, a liquid level meter is installed in the first compartment, and the liquid level meter is connected to the PLC control unit.

[0013] The valve control system consists of a first sugar discharging valve, a second sugar discharging valve and a line connecting them with a PLC control unit.

[0014] Furthermore, the volume of the first chamber is relatively small, the height of the partition exceeds the lower edge of the sugar placing pipe, the first chamber is used to form a liquid seal, and the second chamber is used to store massecuite.

[0015] Furthermore, the first sugar release valve is located above the second sugar release valve.

[0016] Furthermore, the liquid level meter is used to measure the liquid level height of the first compartment in real time and accurately, and transmit the measured data to the PLC control unit in a timely manner.

[0017] Furthermore, the instructions of the PLC control unit coordinate the working status of the two sugar release valves. In the vacuum stage, the first sugar release valve is opened and the second sugar release valve is closed; in the liquid seal formation stage, the first sugar release valve is closed and the second sugar release valve is opened; in the normal sugar release stage, when the liquid level gauge detects that the liquid seal conditions are met, the first sugar release valve and the second sugar release valve are opened at the same time.

[0018] A method for automatically discharging sugar during continuous sugar boiling without reducing vacuum is applied to the aforementioned device for automatically discharging sugar during continuous sugar boiling without reducing vacuum, and comprises the following steps:

[0019] Step 1: Vacuuming stage: Before sugar boiling begins, the operator starts the vacuuming equipment, which is connected to the continuous sugar boiling tank through a pipeline and starts to vacuum the continuous sugar boiling tank. The PLC control unit issues instructions according to the preset program to open the first sugar discharge valve and close the second sugar discharge valve, so that the sugar discharge pipeline and the continuous sugar boiling tank are connected and are in a negative pressure state.

[0020] Step 2: Feeding and boiling sugar: Feed the material into the continuous sugar boiling tank through the feeding pipe, turn on the heating device to boil the material in the continuous sugar boiling tank, and the boiled sugar paste gradually flows into the sugar discharge pipe. As the sugar paste continues to flow in, the sugar discharge pipe is gradually filled.

[0021] Step 3, liquid seal formation stage: When the sugar discharge pipe is filled, the sensor installed on the sugar discharge pipe transmits a signal to the PLC control unit, closes the first sugar discharge valve, opens the second sugar discharge valve, and allows the sugar paste in the sugar discharge pipe to flow into the first chamber by gravity to form a liquid seal. The liquid level meter monitors the liquid level in the first chamber in real time.

[0022] Step 4: Normal sugar discharge: After receiving the signal from the liquid level gauge indicating that the liquid seal condition has been met, the PLC control unit simultaneously opens the first and second sugar discharge valves. Under the action of the pressure difference, the massecuite in the continuous sugar boiling tank is unloaded into the first compartment. As the massecuite continues to flow in, the first compartment is gradually filled. When the liquid level in the first compartment reaches the height of the partition, the massecuite begins to overflow into the second compartment.

[0023] Step 5, massecuite delivery stage: When the massecuite in the second chamber reaches the height of the partition, start the massecuite pump.

[0024] Furthermore, during the feeding and sugar boiling stage, the liquid level gauge of the liquid level monitoring system monitors the liquid level of the first chamber in real time. Since the first sugar discharge valve is open and the second sugar discharge valve is closed, the massecuite will not flow into the first chamber.

[0025] Furthermore, during the liquid seal forming stage, the massecuite in the sugar discharge pipe flows into the first chamber of the massecuite receiving box by gravity. As the massecuite continues to flow in, the liquid level in the first chamber gradually rises. When the massecuite covers the opening of the sugar discharge pipe, a liquid seal is formed.

[0026] Furthermore, during the normal sugar-discharging stage, the liquid level monitoring system continuously monitors the liquid level of the first compartment, and the PLC control unit adjusts the opening degree of the first sugar-discharging valve and the second sugar-discharging valve in real time according to the change of the liquid level.

[0027] Furthermore, during the conveying process, when the liquid level is too low, the first sugar discharge valve is closed to prevent air from entering the continuous sugar boiling tank; when the liquid level is too high, the opening degree of the second sugar discharge valve is reduced to prevent the sugar paste receiving box from overflowing.

[0028] Beneficial effects

[0029] Compared with the prior art, the present invention provides a device for continuously boiling sugar without reducing vacuum and automatically discharging sugar, which has the following beneficial effects:

[0030] 1. The automatic sugar-discharging device for continuous sugar boiling without vacuum reduction can realize automatic control of the sugar-discharging process of the continuous sugar-boiling tank, avoiding tedious manual operations and reducing the burden on operators. The massecuite receiving box is separated into two compartments, which can effectively reduce the amount of liquid-sealed massecuite used and avoid waste. The first compartment and the second compartment are isolated. Once the liquid seal of the first compartment is formed, even if the massecuite in the second compartment is evacuated, it will not affect the liquid seal of the first compartment, nor will it affect the vacuum in the continuous boiling tank.

[0031] 2. This continuous sugar boiling and automatic sugar discharge device, through the unique structural design of the sugar massecuite receiver, uses the first chamber to form a liquid seal, effectively preventing outside air from entering the sugar boiling tank, ensuring that the vacuum level in the sugar boiling tank is not affected during the sugar discharge process, thereby ensuring the crystallization effect of the sugar massecuite and improving product quality. At the same time, the stable vacuum level can also reduce energy consumption and improve production efficiency.

[0032] 3. This automatic sugar-discharging device for continuous sugar boiling without vacuum reduction uses two pneumatic valves installed on the sugar-discharging pipeline, which realizes the automation of the sugar-discharging process under the precise control of the PLC control unit. Compared with traditional manually operated sugar-discharging valves, the automated sugar-discharging device can more accurately control the timing and flow rate of sugar-discharging, avoid problems such as uneven sugar discharging or excessive or insufficient sugar discharging, and further improve product quality and production continuity. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0034] Figure 2 This is a schematic diagram of the PLC control unit circuit of the present invention;

[0035] Figure 3 Schematic diagram of the process of the present invention.

[0036] In the figure: 10, continuous sugar boiling tank; 11, sugar discharge pipe; 12, first sugar discharge valve; 13, second sugar discharge valve; 14, massecuite receiving box; 15, partition; 16, first compartment; 17, second compartment; 18, liquid level gauge; 19, massecuite pump. DETAILED DESCRIPTION

[0037] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in an exemplary manner in conjunction with the accompanying drawings.

[0038] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0040] In the present invention, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0041] In the present invention, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be such that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the descriptions with reference to the terms "one scheme", "some schemes", "examples", "specific examples" or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more schemes or examples.

[0042] See also Figures 1 and 2 The present invention provides a device for automatically discharging sugar by continuously boiling sugar without reducing vacuum, which mainly includes a sugar paste receiving box 14, a sugar discharging pipeline 11, a liquid level monitoring system, a valve control system and a PLC control unit.

[0043] The massecuite receiving box 14 utilizes an innovative structural design. A partition 15 is located at its bottom, separating the box 14 into a first compartment 16 and a second compartment 17. The first compartment 16 is relatively small, and through careful design, the height of the partition 15 exceeds the bottom edge of the sugar discharge pipe 11. This unique structure ensures that the first compartment 16 primarily functions as a liquid seal, while the second compartment 17 is used to store the massecuite. Compared to traditional liquid seals, this structure significantly reduces the amount of massecuite required for the seal, effectively preventing waste. More importantly, during extreme conditions such as brief pressure fluctuations during the sugar discharge process, the liquid seal structure of the first compartment 16 acts as a solid barrier, effectively preventing outside air from entering the continuous boiling tank, ensuring that the vacuum level within the continuous boiling tank is not affected and providing a stable vacuum environment for the sugar boiling process.

[0044] The sugar discharging pipeline 11 is equipped with a first sugar discharging valve 12 and a second sugar discharging valve 13, both of which are pneumatic valves. Pneumatic valves have the significant advantages of fast response speed and high control accuracy, and can perfectly meet the strict requirements for rapid valve opening and closing during the automatic sugar discharging process. The two pneumatic valves are respectively connected to a PLC control unit. Under the precise control of the PLC control unit, the two valves cooperate with each other to realize the automated operation of the sugar discharging process. At different working stages, the PLC control unit will accurately control the opening and closing status of the first sugar discharging valve 12 and the second sugar discharging valve 13 according to the preset program and the feedback signal of the liquid level monitoring system, ensuring that the sugar discharging process proceeds smoothly and stably.

[0045] In the liquid level monitoring system, a liquid level gauge 18 is installed in the first compartment 16 and is connected to the PLC control unit. The primary function of the liquid level gauge 18 is to accurately measure the liquid level in the first compartment 16 in real time and promptly transmit the measured data to the PLC control unit, providing a critical basis for the valve control system. When the liquid level in the first compartment 16 reaches a certain height, meaning that the liquid seal condition is met, the liquid level gauge 18 rapidly sends a signal to the PLC control unit. Upon receiving this signal, the PLC control unit controls the valve operation according to a pre-set program, such as opening or closing the corresponding sugar release valve, thereby achieving precise control over the sugar release process.

[0046] The valve control system consists of a first sugar release valve 12, a second sugar release valve 13, and the circuitry connecting them to the PLC control unit. Throughout the sugar release process, the valve control system acts as a sophisticated command center, coordinating the operating states of the two sugar release valves according to the PLC control unit's instructions. During the vacuum stage, the first sugar release valve 12 opens and the second sugar release valve 13 closes, connecting the sugar release pipeline 11 and the continuous sugar boiling tank 10 to a negative pressure state. During the liquid seal formation stage, the first sugar release valve 12 closes and the second sugar release valve 13 opens, allowing the massecuite in the sugar release pipeline 11 to flow by gravity into the first chamber 16, forming a liquid seal. During the normal sugar release stage, when the liquid level gauge 18 detects that the liquid seal has been achieved, the first and second sugar release valves 12, 13 open simultaneously, allowing the massecuite in the continuous sugar boiling tank 10 to be unloaded smoothly into the first chamber 16, where it then overflows into the second chamber 17.

[0047] The PLC control unit is the core control component of the entire automatic sugar-discharging device, acting as the "brain" of the device. The PLC control unit receives the liquid level signal from the liquid level monitoring system and issues precise control instructions to the valve control system based on pre-stored programs and logic. The PLC control unit pre-stores the parameters and valve action logic for each working stage, and can accurately control the opening time, closing time, and opening degree of the first sugar-discharging valve 12 and the second sugar-discharging valve 13 according to actual liquid level changes and production needs, thereby realizing intelligent control of the automatic sugar-discharging process. At the same time, the PLC control unit also has powerful communication capabilities, and can communicate and interact with the control systems of other sugar-making equipment to realize the automated operation of the entire sugar-making production line and improve production efficiency and coordination.

[0048] See also Figure 3 The present invention also provides a method for continuously boiling sugar and automatically releasing sugar without reducing vacuum based on the above device, and the specific steps are as follows:

[0049] Step 1: Vacuuming: Before sugar boiling begins, the operator activates the vacuuming equipment. The vacuuming equipment is connected to the continuous sugar boiling tank 10 via a pipeline and begins vacuuming the tank. At this point, the PLC control unit, according to a pre-set program, issues commands to open the first sugar discharge valve 12 and close the second sugar discharge valve 13. The sugar discharge pipe 11 is connected to the continuous sugar boiling tank 10. As the vacuuming equipment operates, air is gradually extracted from the pipe 11 and the tank 10, gradually reducing the pressure to a negative pressure state. After a period of vacuuming, the vacuum level within the continuous sugar boiling tank 10 reaches the preset requirement, creating a suitable vacuum environment for sugar boiling. During this process, factors such as the vacuuming equipment's pumping rate, the pipe diameter, and the tightness of the valve all affect the efficiency and duration of the vacuuming process. A slow pumping rate prolongs the vacuuming process, reducing production efficiency. A small pipe diameter increases gas flow resistance, also compromising vacuuming effectiveness. Poor valve tightness allows air to enter, preventing a stable vacuum from being established.

[0050] Step 2: Feeding and Boiling: After vacuuming, materials are fed into the continuous boiling tank 10 through the feed pipe. During the feeding process, the feed rate and amount are strictly controlled to ensure a stable boiling process. Simultaneously, the heating device is activated to boil the materials in the continuous boiling tank 10. The cooked massecuite gradually flows into the discharge pipe 11. As the massecuite continues to flow, the discharge pipe 11 gradually fills up. During this process, the level gauge 18 of the liquid level monitoring system monitors the liquid level in the first chamber 16 in real time. Because the first discharge valve 12 is open and the second discharge valve 13 is closed, massecuite does not flow into the first chamber 16. During the feeding and boiling process, parameters such as the boiling temperature, pressure, and stirring speed must be precisely controlled based on the type of massecuite and the production process requirements. For example, different types of sugar require different boiling temperatures and times. Excessively high temperatures or prolonged boiling times can cause the massecuite to burn, affecting its quality. Inappropriate stirring speeds can affect the massecuite's uniformity and crystallization.

[0051] Step 3: Liquid Seal Formation: When the sugar discharge pipe 11 is filled, a sensor installed on the pipe transmits a signal to the PLC control unit. Upon receiving the signal, the PLC control unit issues a command to close the first sugar discharge valve 12 and open the second sugar discharge valve 13. At this point, the massecuite in the sugar discharge pipe 11 flows by gravity into the first chamber 16 of the massecuite receiving tank 14. As the massecuite continues to flow, the liquid level in the first chamber 16 gradually rises. When the massecuite covers the opening of the sugar discharge pipe 11, a liquid seal is formed. A liquid level gauge 18 monitors the liquid level in the first chamber 16 in real time and sends a signal to the PLC control unit when it detects that the liquid level has reached the liquid seal condition. During the liquid seal formation process, the liquid level in the first chamber 16 may be monitored and confirmed multiple times to ensure the reliability of the liquid seal. If any abnormality in the liquid seal formation is detected, such as a slow or no rise in the liquid level, the PLC control unit may issue an alarm, prompting the operator to inspect and address the situation. Possible causes of a liquid seal abnormality include massecuite blocking the pipe and valve malfunction.

[0052] Step 4: Normal Sugar Release Phase: After receiving a signal from the liquid level gauge 18 indicating that the liquid seal condition has been met, the PLC control unit simultaneously opens the first sugar release valve 12 and the second sugar release valve 13. At this point, the massecuite in the continuous sugar boiling tank 10 is smoothly unloaded into the first chamber 16 due to the pressure differential. As the massecuite continues to flow in, the first chamber 16 gradually fills. When the liquid level in the first chamber 16 reaches the height of the partition 15, the massecuite begins to overflow into the second chamber 17. Throughout the normal sugar release phase, the liquid level monitoring system continuously monitors the liquid level in the first chamber 16. The PLC control unit adjusts the opening degrees of the first and second sugar release valves 12, 13 in real time based on the liquid level changes, ensuring a stable and uniform sugar release process. For example, if the liquid level rises rapidly, the PLC control unit, through the control circuit, reduces the opening degrees of the first and second sugar release valves 12, 13, slowing the flow of massecuite into the first chamber 16. If the liquid level rises slowly, the valves are opened wider to increase the sugar release rate. During this phase, to ensure the accuracy and stability of sugar dispensing, the valve control accuracy can be regularly calibrated and maintained. Furthermore, data analysis can be used to optimize the control program of the PLC control unit and improve the automation level of the sugar dispensing process.

[0053] Step 5: Massecuite Transfer Stage: When the massecuite in the massecuite receiving tank 14 reaches the level of the partition 15, the operator starts the massecuite pump 19. The massecuite pump 19 transfers the massecuite from the massecuite receiving tank 14 to the next process, such as separation and drying. During the massecuite transfer process, the liquid level monitoring system continuously monitors the liquid level in the first chamber 16. The PLC control unit controls the operating states of the first and second sugar release valves 12 and 13 based on the liquid level. This ensures that the vacuum level in the continuous sugar boiling tank 10 is not affected during the massecuite transfer process and that the massecuite in the massecuite receiving tank 14 is continuously and stably supplied to the massecuite pump 19. If the liquid level is too low during transfer, the PLC control unit promptly closes the first sugar release valve 12 to prevent air from entering the continuous sugar boiling tank 10. If the liquid level is too high, the second sugar release valve 13 is appropriately opened to control the flow rate of massecuite and prevent overflow from the massecuite receiving tank 14. During the massecuite transfer process, factors such as the performance of the massecuite pump 19 and the length and diameter of the transfer pipeline can affect the transfer efficiency. For example, the head and flow rate of the massecuite pump 19 need to be reasonably selected according to production requirements. If the head is insufficient, the massecuite cannot be transported to the designated location; if the flow rate is too large or too small, it will affect production efficiency and the stability of massecuite supply.

[0054] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for continuously boiling sugar without reducing vacuum and automatically discharging sugar, characterized by: The device mainly comprises a continuous sugar boiling tank (10), a sugar paste receiving box (14), a sugar discharge pipeline (11), a liquid level monitoring system, a valve control system and a PLC control unit; The sugar discharging pipe (11) is connected to the continuous sugar boiling tank (10) and the sugar paste receiving box (14) above and below respectively. The sugar discharging pipe (11) is equipped with a first sugar discharging valve (12) and a second sugar discharging valve (13); A partition (15) is fixedly installed at the bottom of the massecuite receiving box (14), and the partition (15) divides the massecuite receiving box (14) into a first compartment (16) and a second compartment (17). The outer bottom of the massecuite receiving box (14) is connected to a massecuite pump (19); In the liquid level monitoring system, a liquid level meter (18) is installed in the first compartment (16), and the liquid level meter (18) is connected to the PLC control unit; The valve control system consists of a first sugar discharging valve (12), a second sugar discharging valve (13) and a circuit connecting them with a PLC control unit.

2. The device for continuously boiling sugar and automatically discharging sugar without reducing vacuum according to claim 1, characterized in that: The volume of the first chamber (16) is relatively small, the height of the partition (15) exceeds the lower edge of the sugar pipe (11), the first chamber (16) is used to form a liquid seal, and the second chamber (17) is used to store sugar paste.

3. The device for continuously boiling sugar without reducing vacuum and automatically discharging sugar according to claim 1, characterized in that: The first sugar release valve (12) is located above the second sugar release valve (13).

4. The device for continuously boiling sugar and automatically discharging sugar without reducing vacuum according to claim 1, characterized in that: The liquid level meter (18) is used to measure the liquid level height of the first chamber (16) in real time and accurately, and transmit the measured data to the PLC control unit in a timely manner.

5. The device for continuously boiling sugar and automatically discharging sugar without reducing vacuum according to claim 1, characterized in that: The instructions of the PLC control unit coordinate the working states of the two sugar release valves. In the vacuum stage, the first sugar release valve (12) is opened and the second sugar release valve (13) is closed; in the liquid seal formation stage, the first sugar release valve (12) is closed and the second sugar release valve (13) is opened; in the normal sugar release stage, when the liquid level meter (18) detects that the liquid seal condition is met, the first sugar release valve (12) and the second sugar release valve (13) are opened at the same time.

6. A method for continuously boiling sugar and automatically releasing sugar without reducing vacuum, characterized by: The method is applied to a device for continuous sugar boiling without vacuum reduction and automatic sugar discharging as described in any one of claims 1 to 5, and the method comprises the following steps: Step 1, vacuuming stage: before sugar boiling begins, the operator starts the vacuuming device, which is connected to the continuous sugar boiling tank (10) through a pipeline, and starts vacuuming the continuous sugar boiling tank (10). The PLC control unit issues instructions according to a preset program to open the first sugar discharge valve (12) and close the second sugar discharge valve (13), so that the sugar discharge pipeline (11) and the continuous sugar boiling tank (10) are connected and are in a negative pressure state; Step 2, feeding and boiling sugar stage: feeding the material into the continuous boiling sugar tank (10) through the feeding pipe, turning on the heating device to boil the material in the continuous boiling sugar tank (10), and the boiled massecuite gradually flows into the sugar discharge pipe (11). As the massecuite continues to flow in, the sugar discharge pipe (11) is gradually filled; Step 3, liquid seal formation stage: When the sugar discharge pipe (11) is filled, the sensor installed on the sugar discharge pipe (11) transmits a signal to the PLC control unit, closes the first sugar discharge valve (12), opens the second sugar discharge valve (13), and allows the sugar paste in the sugar discharge pipe (11) to flow into the first chamber (16) by gravity to form a liquid seal, and the liquid level meter (18) monitors the liquid level of the first chamber (16) in real time; Step 4, normal sugar discharge stage: after the PLC control unit receives the signal from the liquid level meter (18) indicating that the liquid seal condition has been met, it opens the first sugar discharge valve (12) and the second sugar discharge valve (13) at the same time. Under the action of the pressure difference, the massecuite in the continuous sugar boiling tank (10) is unloaded into the first chamber (16). As the massecuite continues to flow in, the first chamber (16) is gradually filled. When the liquid level in the first chamber (16) reaches the height of the partition (15), the massecuite begins to overflow into the second chamber (17). Step 5, massecuite conveying stage: when the massecuite in the second chamber (17) reaches the height of the partition (15), the massecuite pump (19) is turned on.

7. The method for continuously boiling sugar and automatically releasing sugar without reducing vacuum according to claim 6, characterized in that: During the sugar-boiling stage, the liquid level meter (18) of the liquid level monitoring system monitors the liquid level of the first chamber (16) in real time. Since the first sugar-discharging valve (12) is open and the second sugar-discharging valve (13) is closed, the massecuite does not flow into the first chamber (16).

8. The method for continuously boiling sugar and automatically releasing sugar without reducing vacuum according to claim 6, characterized in that: During the liquid seal forming stage, the massecuite in the sugar discharge pipe (11) flows into the first chamber (16) of the massecuite receiving box (14) by gravity. As the massecuite continues to flow in, the liquid level in the first chamber (16) gradually rises. When the massecuite covers the opening of the sugar discharge pipe (11), a liquid seal is formed.

9. The method for continuously boiling sugar and automatically releasing sugar without reducing vacuum according to claim 6, characterized in that: During the normal sugar discharging stage, the liquid level monitoring system continuously monitors the liquid level of the first chamber (16), and the PLC control unit adjusts the opening degree of the first sugar discharging valve (12) and the second sugar discharging valve (13) in real time according to the change of the liquid level.

10. The method for continuously boiling sugar and automatically releasing sugar without reducing vacuum according to claim 6, characterized in that: During the conveying process, when the liquid level is too low, the first sugar discharge valve (12) is closed to prevent air from entering the continuous sugar boiling tank (10); when the liquid level is too high, the opening degree of the second sugar discharge valve (13) is reduced to prevent the sugar paste receiving box (14) from overflowing.

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