Forced circulation crystallizer for sucralose mother liquor

Abstract

The present application relates to sucrose crystallization technical field, and disclose a forced circulation crystallizer for trichloro sucrose mother liquor, including rack, the rack is installed with crystallization kettle and mother liquor tank, the filter assembly is provided in the mother liquor tank, the filter assembly includes mounting frame, the mounting frame is fixed in the inside of mother liquor tank, and the side surface of mounting frame is combined with the inner face of mother liquor tank, two rotating shafts are rotatably installed on the mounting frame, and the two rotating shafts are located at the two ends of mounting frame respectively, the roller is fixedly sleeved on each rotating shaft, and the two rollers are drivenly connected by filter membrane, the filter assembly further includes motor, and the motor is installed on the side surface of mother liquor tank.The present application works, the filter membrane under the motion state makes the mother liquor flow through different areas uniformly by continuous movement, avoids local blockage, and the impurities are uniformly dispersed on the membrane surface, the effective filtering area is expanded and the service life of single point is prolonged, and the vibration or water flow scouring effect promotes the impurities to fall off.

Description

Technical Field

[0001] This invention relates to the field of sucrose crystallization technology, and more particularly to a forced circulation crystallizer for sucralose mother liquor. Background Technology

[0002] The forced circulation crystallizer for sucralose mother liquor is a device that uses a forced circulation pump to drive the crystal slurry and raw material liquid to circulate, and uses a heat exchanger to achieve temperature control, so that the solute is deposited on the surface of the crystal grains to achieve continuous crystallization. It is especially suitable for processing high-viscosity, easily crystallizing sucralose mother liquor, and can effectively improve crystal growth efficiency and product purity.

[0003] Before crystallizing sucralose mother liquor, it is necessary to filter and remove impurities to prevent these impurities from affecting the purity of the crystals. In existing technologies, impurities are generally removed using a filter membrane. During this process, the filter membrane is stationary while the sucralose mother liquor passes through it. Because the filter membrane is stationary and the position of the mother liquor remains constant, only a localized area of ​​the membrane continuously participates in the filtration process, while the rest cannot be effectively utilized. This uneven filtration distribution not only results in low overall membrane utilization and significant resource waste, but also accelerates clogging or wear in areas subjected to prolonged high-load filtration, thereby shortening the membrane's lifespan, increasing replacement frequency and maintenance costs. Furthermore, localized clogging can cause uneven filtration resistance, reducing overall filtration efficiency and affecting the removal of impurities from the sucralose mother liquor, ultimately negatively impacting the purity of the subsequent crystals.

[0004] Therefore, a forced circulation crystallizer for sucralose mother liquor needs to be designed to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a forced circulation crystallizer for sucralose mother liquor.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A forced circulation crystallizer for sucralose mother liquor includes a frame on which a crystallization vessel and a mother liquor tank are mounted. A filter assembly is provided inside the mother liquor tank. The filter assembly includes a mounting frame fixed inside the mother liquor tank, with the side of the mounting frame fitting against the inner surface of the mother liquor tank. Two rotating shafts are rotatably mounted on the mounting frame, located at opposite ends of the frame. Each rotating shaft has a roller fixedly fitted onto it. The two rollers are connected via a filter membrane. The filter assembly also includes a motor mounted on the side of the mother liquor tank. The ends of both rotating shafts extend outside the mother liquor tank, and the output shaft of the motor is connected to one of the rotating shafts. The mother liquor tank is equipped with a mounting tube with several openings. During operation, the sucralose mother liquor enters the mounting tube and flows through the openings to the filter membrane, where the rotating filter membrane dynamically filters the sucralose mother liquor.

[0007] In a preferred embodiment of the present invention, the mounting tube is located above the mounting frame, and each of the openings is oriented toward the filter membrane.

[0008] As a preferred embodiment of the present invention, the mother liquor tank is provided with a pumping assembly, which consists of a pumping structure and a one-way flow-limiting structure. The mother liquor tank is provided with a pushing assembly, which is used to drive the pumping structure to operate. The pumping assembly and the pushing assembly together pump the sucralose mother liquor into the installation pipe, so that the sucralose mother liquor circulates in the mother liquor tank.

[0009] As a preferred embodiment of the present invention, the pumping structure includes a sealing cylinder, which is fixed inside the mother liquor tank and located below the mounting frame. The sealing cylinder is connected to the mounting pipe via a connecting pipe, and a one-way valve is installed on the connecting pipe. A sliding plug is slidably connected inside the sealing cylinder, and a push rod is fixed to the side of the sliding plug. The end of the push rod away from the sliding plug extends to the outside of the sealing cylinder, and a mounting bracket is fixed to the end of the push rod outside the sealing cylinder. The mounting bracket has an upward-opening U-shaped structure.

[0010] As a preferred embodiment of the present invention, the one-way valve restricts the liquid to enter the installation pipe only from the sealing cylinder.

[0011] As a preferred embodiment of the present invention, the unidirectional flow limiting structure includes a plurality of return ports and a plurality of sliding rings. The plurality of return ports are all opened on the sealing cylinder, and the plurality of sliding rings are all slidably sleeved on the sealing cylinder. Each sliding ring is fixed with a bracket, and a crossbar is fixed together on the plurality of brackets. An installation ring is slidably sleeved at the end of the crossbar. A fixing plate is fixed on the outer circumferential surface of the installation ring, and the end of the fixing plate away from the installation ring extends into the opening of the mounting bracket. The unidirectional flow limiting structure also includes two limiting protrusions, both of which are fixed on the sealing cylinder, and one of the sliding rings is located between the two limiting protrusions.

[0012] As a preferred embodiment of the present invention, the inner ring of the mounting ring is fixed with a rubber ring, and the rubber ring is in contact with the outer surface of the crossbar.

[0013] As a preferred embodiment of the present invention, for a sliding ring located between two limiting protrusions, when the sliding ring is in contact with one of the limiting protrusions, the plurality of sliding rings are respectively positioned opposite to the plurality of return ports; when the sliding ring is in contact with the other limiting protrusion, the plurality of sliding rings are respectively offset from the plurality of return ports.

[0014] In a preferred embodiment of the present invention, the pushing assembly includes a rotating rod, a slide rail, a moving rod, and a movable rod. The rotating rod is rotatably mounted on the side of the mother liquor tank. The rotating rod is connected to the output shaft of the motor via gear one and gear two. An eccentric wheel is fixedly sleeved on the rotating rod, and the eccentric wheel is coaxially arranged with the rotating rod. The slide rail is fixed to the side of the mother liquor tank, and a sliding seat is slidably mounted on the slide rail. One end of the moving rod is connected to the sliding seat, and the other end of the moving rod is connected to the movable rod. The movable rod passes through the mother liquor tank and is slidably connected to the mother liquor tank. One end of the movable rod located inside the mother liquor tank is fixedly connected to a fixed plate. A collar is fixedly sleeved on the movable rod, and the collar is connected to the mother liquor tank via a spring.

[0015] In a preferred embodiment of the present invention, the slide is positioned directly opposite the eccentric wheel.

[0016] The present invention has the following beneficial effects: 1. The filter membrane in motion continuously moves, allowing the mother liquor to flow evenly through different areas, avoiding local clogging. At the same time, impurities are evenly dispersed on the membrane surface, expanding the effective filtration area and extending the service life of a single point. Vibration or water flow scouring promotes the removal of impurities, reduces membrane surface fouling, maintains stable flux, and significantly improves filtration efficiency and equipment reliability. 2. Through the linkage design of the pumping component and the driving component, the mother liquor is circulated in the tank. The sealed cylinder periodically pumps the mother liquor to the installation pipe. With the staggered control of the return port, a continuous circulation filtration system is formed to ensure that the mother liquor fully contacts the filter membrane, which greatly improves the impurity removal rate and the purity of the crystallization raw material. 3. By using a motor to drive the rotating rod and eccentric wheel, the movement of the sliding plug and the opening and closing of the return port are synchronously controlled through mechanical transmission. Mother liquor circulation can be achieved without an additional pump body. The unidirectional flow limiting structure and spring reset mechanism further optimize power transmission efficiency, reduce energy consumption, and lower equipment complexity and maintenance costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the forced circulation crystallizer for sucralose mother liquor proposed in this invention; Figure 2 Schematic diagram of the mother liquor tank Figure 1 ; Figure 3 Schematic diagram of the mother liquor tank Figure 2 ; Figure 4 This is a cross-sectional view of the mother liquor tank. Figure 5 A schematic diagram of the pumping and filtering components; Figure 6 This is a schematic diagram of the pumping assembly. Figure 7 This is a cross-sectional view of the sealing cylinder. Figure 8 This is a structural diagram of the mounting ring and the fixing plate.

[0018] In the diagram: 1. Frame; 2. Crystallizer; 3. Mother liquor tank; 41. Mounting frame; 42. Rotating shaft; 43. Roller; 44. Filter membrane; 45. Motor; 51. Mounting pipe; 52. Opening; 61. Sealing cylinder; 611. Return port; 612. Limiting protrusion; 62. Connecting pipe; 621. One-way valve; 63. Sliding plug; 64. Push rod; 641. Mounting bracket; 71. Sliding ring; 72. Bracket; 73. Crossbar; 74. Mounting ring; 741. Rubber ring; 75. Fixing plate; 81. Rotating rod; 82. Gear 1; 83. Gear 2; 84. Eccentric wheel; 85. Slide rail; 86. Slide seat; 87. Moving rod; 88. Movable rod; 881. Collar; 89. Spring. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Example 1: This example shows a forced circulation crystallizer for sucralose mother liquor disclosed in this embodiment, referring to... Figure 1 and Figure 4The system includes a frame 1, on which a crystallization vessel 2 and a mother liquor tank 3 are mounted. The crystallization vessel 2 is used to crystallize the sucralose mother liquor. The specific structure and working principle of the crystallization vessel 2 are existing technologies, implemented using conventional methods, and are not shown in the figure, nor will they be described in detail here. The mother liquor tank 3 is used to store the sucralose mother liquor. During crystallization, the sucralose mother liquor enters the crystallization vessel 2 from the mother liquor tank 3 under the action of a pump for crystallization. The mother liquor tank 3 is equipped with a filter assembly for filtering the sucralose mother liquor. The sucrose mother liquor is filtered to remove impurities. The filtration assembly includes a mounting frame 41, which is fixed inside the mother liquor tank 3, with its side surface fitting against the inner surface of the tank 3. Two rotating shafts 42 are rotatably mounted on the mounting frame 41, located at opposite ends of the frame. Each shaft 42 is fitted with a roller 43, which is connected to the rollers 43 via a filter membrane 44. The filter membrane 44 has a closed annular structure. When the two shafts 42 rotate... Two rollers 43 can drive the filter membrane 44 to move. The filter assembly also includes a motor 45, which is installed on the side of the mother liquor tank 3. The ends of the two rotating shafts 42 extend to the outside of the mother liquor tank 3. The output shaft of the motor 45 is connected to one of the rotating shafts 42. When the motor 45 runs, it can drive the corresponding rotating shaft 42 to rotate, which ultimately causes the two rollers 43 to drive the filter membrane 44 to move. It should be noted that, in order to prevent slippage between the two rollers 43 and the filter membrane 44, a high-friction coefficient anti-slip texture or rubber coating can be set on the surface of the rollers 43 to enhance the friction of the contact surface. At the same time, by adjusting the output torque of the motor 45, the rotating shaft 42 can apply an appropriate tension force to the filter membrane 44 to ensure that the filter membrane 44 is always in a taut state. In addition, the two ends of the filter membrane 44 can be designed to fit into the grooves on the surface of the rollers 43. Through mechanical interlocking, the transmission stability can be further improved, and relative slippage caused by insufficient friction or tension relaxation can be avoided. This is existing technology and will not be described in detail here.

[0021] An installation pipe 51 is fixed inside the mother liquor tank 3. Several openings 52 are provided on the installation pipe 51, which is located above the installation frame 41. Each opening 52 faces the filter membrane 44. During operation, the sucralose mother liquor stored inside the mother liquor tank 3 is propelled into the installation pipe 51 by a pump or a pumping structure with the same function, and finally flows through the openings 52 to the filter membrane 44. During this process, the filter membrane 44 filters out impurities in the sucralose mother liquor. Simultaneously, during filtration, the motor 45 operates, driving the filter membrane 44 to move. Compared to the static state of the filter membrane 44 in the prior art, the dynamic state of the filter membrane 44 allows the mother liquor to flow evenly through its different areas through continuous movement, avoiding rapid clogging of local areas due to long-term impact from high concentrations of impurities. At the same time, during the dynamic filtration process, impurities are evenly dispersed on the surface of the filter membrane 44, which not only extends the service life of the single-point filtration position, but also improves the overall filtration efficiency by expanding the effective filtration area. In addition, the moving filter membrane 44 can also promote the shedding of trapped impurities through vibration or water flow scouring, reducing membrane surface fouling and maintaining a stable flux.

[0022] The implementation principle of this embodiment is as follows: The frame 1 is equipped with a crystallization vessel 2 and a mother liquor tank 3. The mother liquor tank 3 is used to store sucralose mother liquor. During crystallization, the mother liquor is pumped into the crystallization vessel 2 for crystallization treatment. A filter assembly is installed inside the mother liquor tank 3. Its mounting frame 41 is fixed inside the tank and its side is attached to the inner wall. Rollers 43 are sleeved on both ends of the rotating shaft 42 and are connected by a closed-loop strip filter membrane 44. The motor 45 drives either rotating shaft 42 to rotate, so that the two rollers 43 drive the filter membrane 44 to move continuously. At the same time, the anti-slip texture on the surface of the rollers 43, the tension adjustment and the mechanical interlocking structure prevent slippage. The mounting pipe 51, fixed inside the mother liquor tank 3, is located above the mounting frame 41, with its opening 52 facing the filter membrane 44. After the mother liquor is pumped into the mounting pipe 51, it flows evenly through the opening 52 to the moving filter membrane 44, achieving dynamic filtration. The movement of the filter membrane 44 causes the mother liquor to flow through different areas, avoiding local blockage. Impurities are evenly dispersed on the membrane surface, expanding the effective filtration area and extending the service life of a single point. At the same time, vibration or water flow scouring promotes the removal of impurities, reducing membrane surface contamination. Finally, the mother liquor with impurities removed enters the crystallization kettle 2 to complete the crystallization process.

[0023] Example 2: Based on Example 1, this example discloses a forced circulation crystallizer for sucralose mother liquor, such as... Figure 2-8 As shown, the mother liquor tank 3 is equipped with a pumping assembly, which consists of a pumping structure and a one-way flow-limiting structure. The mother liquor tank 3 is equipped with a pushing assembly, which is used to drive the pumping structure. The pumping assembly and the pushing assembly together pump the sucralose mother liquor into the installation pipe 51, so that the sucralose mother liquor circulates in the mother liquor tank 3 to achieve circulating filtration.

[0024] The pumping structure includes a sealing cylinder 61, which is fixed inside the mother liquor tank 3 and located below the mounting frame 41. The sealing cylinder 61 is immersed in the sucralose mother liquor. The sealing cylinder 61 is connected to the mounting pipe 51 via a connecting pipe 62. A one-way valve 621 is installed on the connecting pipe 62, which restricts the liquid from entering the mounting pipe 51 only from the sealing cylinder 61. A sliding plug 63 is slidably connected inside the sealing cylinder 61. A push rod 64 is fixed to the side of the sliding plug 63. The end of the push rod 64 away from the sliding plug 63 extends to the outside of the sealing cylinder 61. A hole adapted to the push rod 64 is opened on the sealing cylinder 61. The push rod 64 passes through the hole and is slidably connected in the hole. A mounting bracket 641 is fixed to the end of the push rod 64 outside the sealing cylinder 61. The mounting bracket 641 has an upward-opening U-shaped structure.

[0025] The unidirectional flow-limiting structure includes several return ports 611 and several sliding rings 71. The return ports 611 are all located on the sealing cylinder 61, and the sliding rings 71 are slidably fitted onto the sealing cylinder 61. Each sliding ring 71 is fixed with a bracket 72, and a crossbar 73 is fixed to all the brackets 72. A mounting ring 74 is slidably fitted onto the end of the crossbar 73. A fixing plate 75 is fixed to the outer circumference of the mounting ring 74, with the end of the fixing plate 75 away from the mounting ring 74 extending into the opening of the mounting bracket 641. The mounting ring 74 can slide freely on the crossbar 73. A rubber ring 741 is fixed to the inner ring of the mounting ring 74, and the rubber ring 741 is in contact with the outer surface of the crossbar 73. The rubber ring 741 ensures that the mounting ring 74 can slide freely on the crossbar 73. 4 has a large frictional force with the crossbar 73, which facilitates the installation ring 74 to drive the crossbar 73 to move. The unidirectional flow restriction structure also includes two limiting protrusions 612. Both limiting protrusions 612 are fixed on the sealing cylinder 61. One of the sliding rings 71 is located between the two limiting protrusions 612. The two limiting protrusions 612 provide a limit for several sliding rings 71. For the sliding ring 71 located between the two limiting protrusions 612, when the sliding ring 71 is in contact with one of the limiting protrusions 612, several sliding rings 71 are respectively located in positions directly opposite several return ports 611. When the sliding ring 71 is in contact with the other limiting protrusion 612, several sliding rings 71 are respectively staggered from several return ports 611.

[0026] The driving assembly includes a rotating rod 81, a slide rail 85, a moving rod 87, and a movable rod 88. The rotating rod 81 is rotatably mounted on the side of the mother liquor tank 3. The rotating rod 81 is connected to the output shaft of the motor 45 via gear 1 82 and gear 2 83. An eccentric wheel 84 is fixedly sleeved on the rotating rod 81, and the eccentric wheel 84 and the rotating rod 81 are coaxially arranged. The slide rail 85 is fixed to the side of the mother liquor tank 3. A sliding seat 86 is slidably arranged on the slide rail 85, and the sliding seat 86 is positioned directly opposite the eccentric wheel 84. One end of the moving rod 87 is connected to the sliding seat 86, and the other end of the moving rod 87 is connected to the movable rod 88. The movable rod 88 passes through the mother liquor tank 3 and is slidably connected to the mother liquor tank 3. One end of the movable rod 88 located inside the mother liquor tank 3 is fixedly connected to the fixed plate 75. A collar 881 is fixedly sleeved on the movable rod 88, and the collar 881 is connected to the mother liquor tank 3 via a spring 89.

[0027] The implementation principle of this embodiment is as follows: When the motor 45 is running, it can drive the rotating rod 81 to rotate through the meshing gear 1 82 and gear 2 83. When the rotating rod 81 rotates, it drives the eccentric wheel 84 to rotate. When the eccentric wheel 84 rotates, it periodically pushes the slide block 86. When the eccentric wheel 84 pushes the slide block 86, the slide block 86 drives the moving rod 87 to move. When the moving rod 87 moves, the movable rod 88 moves accordingly. When the movable rod 88 moves, it can drive the fixed plate 75 to move. When the fixed plate 75 moves, it can drive the mounting ring 74 to move. The mounting ring 74 can drive the crossbar 73 to move through friction. When the crossbar 73 moves, it drives the sliding rings 71 to move through the brackets 72. For the sliding ring 71 located between the two limiting protrusions 612, when the sliding ring 71 contacts one of the limiting protrusions 612, the sliding ring 71 cannot continue to move, which makes the several When the sliding rings 71 cannot move, they block the return ports 611, preventing the mother liquor in the sealing cylinder 61 from flowing out. It should be noted that during the movement of the sliding rings 71, the fixing plate 75 moves within the opening of the U-shaped mounting bracket 641. At this time, the fixing plate 75 does not push the mounting bracket 641. When the sliding rings 71 cannot move, the fixing plate 75 comes into contact with the mounting bracket 641. Furthermore, as the movable rod 88 continues to move, the fixing plate 75 can push the push rod 64 through the mounting bracket 641, causing the push rod 64 to move the sliding plug 63. Based on the above process, the sliding plug 63 can only move when the sliding rings 71 block the return ports 611. When the sliding plug 63 moves, it can push the mother liquor in the sealing cylinder 61 into the mounting pipe 51 through the connecting pipe 62, allowing the mother liquor to pass through the filter membrane 44.

[0028] Conversely, when the eccentric wheel 84 no longer pushes the slide block 86, the movable rod 88 resets under the action of the spring 89, and drives the fixed plate 75 to reset. When the fixed plate 75 resets, it first drives the crossbar 73 to reset through the mounting ring 74, causing several sliding rings 71 to reset. Finally, the several sliding rings 71 are misaligned with several return ports 611. When the fixed plate 75 moves to the position of contacting the mounting bracket 641, the fixed plate 75 can drive the mounting bracket 641 to move, and finally drive the push rod 64 to move. When the push rod 64 moves, the slide block 63 moves accordingly, making... When the sliding plug 63 resets, the sliding rings 71 are staggered from the return ports 611, allowing the mother liquor in the mother liquor tank 3 to enter the sealing cylinder 61 through the return ports 611. In summary, with the cooperation of the pumping component and the pushing component, the sealing cylinder 61 can continuously pump the mother liquor into the installation pipe 51, realizing the circulation of the mother liquor. This design does not require a separate pump or other drive source; the power of the motor 45 can be used to realize the circulation of the mother liquor and achieve a linkage effect.

[0029] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A forced circulation crystallizer for sucralose mother liquor, characterized in that, The system includes a frame (1), on which a crystallization vessel (2) and a mother liquor tank (3) are mounted. A filter assembly is provided inside the mother liquor tank (3). The filter assembly includes a mounting frame (41), which is fixed inside the mother liquor tank (3). The side of the mounting frame (41) is in contact with the inner surface of the mother liquor tank (3). Two rotating shafts (42) are rotatably mounted on the mounting frame (41), and the two rotating shafts (42) are located at the two ends of the mounting frame (41). Each rotating shaft (42) is fixedly fitted with a roller (43). The two rollers (43) are connected by a filter membrane (44). The filter assembly also includes a motor (45), which is mounted on the side of the mother liquor tank (3). The ends of the two rotating shafts (42) extend to the outside of the mother liquor tank (3). The output shaft of the motor (45) is connected to one of the rotating shafts (42). The mother liquor tank (3) is fixed with an installation tube (51) inside. The installation tube (51) has several openings (52). When working, the sucralose mother liquor enters the installation tube (51) and flows through the several openings (52) to the filter membrane (44). The operating filter membrane (44) dynamically filters the sucralose mother liquor.

2. The forced circulation crystallizer for sucralose mother liquor according to claim 1, characterized in that, The mounting tube (51) is located above the mounting frame (41), and each of the openings (52) is oriented toward the filter membrane (44).

3. The forced circulation crystallizer for sucralose mother liquor according to claim 1, characterized in that, The mother liquor tank (3) is equipped with a pumping assembly, which consists of a pumping structure and a one-way flow limiting structure. The mother liquor tank (3) is equipped with a pushing assembly, which is used to drive the pumping structure to operate. The pumping assembly and the pushing assembly together pump the sucralose mother liquor into the installation pipe (51), so that the sucralose mother liquor circulates in the mother liquor tank (3).

4. The forced circulation crystallizer for sucralose mother liquor according to claim 3, characterized in that, The pumping structure includes a sealing cylinder (61), which is fixed inside the mother liquor tank (3). The sealing cylinder (61) is located below the mounting frame (41). The sealing cylinder (61) is connected to the mounting pipe (51) through a connecting pipe (62). A one-way valve (621) is installed on the connecting pipe (62). A sliding plug (63) is slidably connected inside the sealing cylinder (61). A push rod (64) is fixed on the side of the sliding plug (63). The end of the push rod (64) away from the sliding plug (63) extends to the outside of the sealing cylinder (61). A mounting bracket (641) is fixed on the end of the push rod (64) outside the sealing cylinder (61). The mounting bracket (641) has an upward-opening U-shaped structure.

5. The forced circulation crystallizer for sucralose mother liquor according to claim 4, characterized in that, The one-way valve (621) restricts liquid from entering the mounting pipe (51) only from the sealing cylinder (61).

6. The forced circulation crystallizer for sucralose mother liquor according to claim 4, characterized in that, The unidirectional flow limiting structure includes several return ports (611) and several sliding rings (71). Several return ports (611) are opened on the sealing cylinder (61), and several sliding rings (71) are slidably sleeved on the sealing cylinder (61). Each sliding ring (71) is fixed with a bracket (72), and several brackets (72) are jointly fixed with a crossbar (73). The end of the crossbar (73) is slidably sleeved with an installation ring (74). The outer circumferential surface of the installation ring (74) is fixed with a fixing plate (75). The end of the fixing plate (75) away from the installation ring (74) extends into the opening of the mounting bracket (641). The unidirectional flow limiting structure also includes two limiting protrusions (612). Both limiting protrusions (612) are fixed on the sealing cylinder (61), and one of the sliding rings (71) is located between the two limiting protrusions (612).

7. The forced circulation crystallizer for sucralose mother liquor according to claim 6, characterized in that, The inner ring of the mounting ring (74) is fixed with a rubber ring (741), and the rubber ring (741) is in contact with the outer surface of the crossbar (73).

8. The forced circulation crystallizer for sucralose mother liquor according to claim 6, characterized in that, For a sliding ring (71) located between two limiting protrusions (612), when the sliding ring (71) is in contact with one of the limiting protrusions (612), the sliding rings (71) are respectively positioned opposite the plurality of return ports (611), and when the sliding ring (71) is in contact with the other limiting protrusion (612), the sliding rings (71) are respectively offset from the plurality of return ports (611).

9. The forced circulation crystallizer for sucralose mother liquor according to claim 6, characterized in that, The pushing assembly includes a rotating rod (81), a slide rail (85), a moving rod (87), and a movable rod (88). The rotating rod (81) is rotatably mounted on the side of the mother liquor tank (3). The rotating rod (81) and the output shaft of the motor (45) are connected by a gear 1 (82) and a gear 2 (83). An eccentric wheel (84) is fixedly sleeved on the rotating rod (81), and the eccentric wheel (84) and the rotating rod (81) are coaxially arranged. The slide rail (85) is fixed on the side of the mother liquor tank (3), and the slide rail (85) slides on the side of the mother liquor tank (3). A sliding seat (86) is provided. One end of the moving rod (87) is connected to the sliding seat (86), and the other end of the moving rod (87) is connected to the movable rod (88). The movable rod (88) passes through the mother liquor tank (3) and is slidably connected to the mother liquor tank (3). One end of the movable rod (88) located inside the mother liquor tank (3) is fixedly connected to the fixing plate (75). A collar (881) is fixedly sleeved on the movable rod (88), and the collar (881) is connected to the mother liquor tank (3) by a spring (89).

10. The forced circulation crystallizer for sucralose mother liquor according to claim 9, characterized in that, The slide (86) is positioned opposite the eccentric wheel (84).

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