Crystallization device for stevioside production

Abstract

The utility model discloses a crystallization device for stevioside production, which relates to the technical field of stevioside production and comprises a crystallization tank, a double-shaft heating type stirring mechanism and a solid-liquid separation type discharging mechanism, the double-shaft heating type stirring mechanism comprises a double-shaft motor, two rotating shafts, two electric heating rods, two spiral stirring blades, two driven bevel gears and two driving bevel gears. The double-shaft heating type stirring mechanism is arranged, sufficient stirring can be carried out, two electric heating rods can transfer heat to two spiral stirring blades, in the rotary stirring process, it can be guaranteed that mixed liquid is heated evenly, then crystallization of the mixed liquid is more sufficient and even, and the crystallization efficiency can be improved; the solid-liquid separation type discharging mechanism is arranged, effective separation of waste liquid and stevioside crystals can be achieved in the discharging stage, the solid-liquid separation efficiency is improved, and then the discharging efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of stevioside production, in particular to a crystallization device for stevioside production. Background Technique

[0002] A crystallization device is used in the production of stevioside. It mainly reduces the solubility by heating the stevioside mixed solution, resulting in the crystallization and precipitation of substances in the mixed solution to precipitate stevioside crystal particles. However, the existing crystallization device has the following problems in the actual operation process:

[0003] First, during the crystallization process, there is a situation where the mixed liquid is unevenly heated, leading to uneven crystallization, thus reducing the crystallization efficiency.

[0004] Second, in the discharging stage, the waste liquid and stevioside crystals cannot be well separated, thus reducing the solid-liquid separation efficiency and resulting in a low discharging efficiency. Content of the Utility Model

[0005] The purpose of the utility model is to solve the shortcomings existing in the prior art, and to propose a crystallization device for stevioside production.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A crystallization device for stevioside production includes a crystallization tank with a feed hopper fixedly connected to the top, a double-shaft heating type stirring mechanism, and a solid-liquid separation type discharging mechanism.

[0008] The double-shaft heating type stirring mechanism includes a double-shaft motor fixedly installed on the outer wall of the center of the top of the crystallization tank, two rotating shafts sequentially rotatably installed on the top of the crystallization tank, two electric heating rods sequentially coaxially fixedly installed on the outer walls of the bottoms of the two rotating shafts, two spiral stirring blades symmetrically fixedly connected to the outer walls of the two electric heating rods, two driven bevel gears sequentially fixedly sleeved on the two rotating shafts, and two driving bevel gears sequentially fixedly sleeved on the two output shafts of the double-shaft motor.

[0009] The solid-liquid separation type discharging mechanism includes a waste liquid collection box, a crystal collection box inserted into one side of the waste liquid collection box, a separation cylinder fixedly penetrating and connecting transversely inside the waste liquid collection box, a transmission shaft arranged inside the separation cylinder, an auger welded to the outer wall of the transmission shaft, and a driving motor fixedly installed on the side wall of the separation cylinder.

[0010] Preferably, both of the two spiral stirring blades are located inside the crystallization tank, the spiral directions of the two spiral stirring blades are opposite, and the two driving bevel gears are respectively engaged with the two driven bevel gears. In this way, through the rotation of the two symmetrical spiral stirring blades with opposite spiral directions, the methanol aqueous solution and the crude stevioside added can be fully stirred.

[0011] Preferably, the output shaft of the driving motor is connected through a sealed bearing to the inner wall of one side of the separation cylinder, and the output shaft of the driving motor is coaxially and fixedly connected to one end of the transmission shaft through a coupling.

[0012] Preferably, the two sides of the separation cylinder are hermetically connected to the waste liquid collection box, and the bottom of the separation cylinder is provided with uniformly distributed water permeable holes, which facilitate the discharge of waste liquid during the discharging stage. The bottom of the crystallization tank is fixedly communicated with the top of the separation cylinder by a same connecting pipe, and a solenoid valve is installed on the connecting pipe.

[0013] Preferably, one side of the waste liquid collection box is fixedly communicated with a drain pipe, and a valve is installed on the drain pipe, which facilitates the discharge of the waste liquid in the waste liquid collection box.

[0014] Preferably, slip rings are installed on both of the two rotating shafts, and both of the two electric heating rods are respectively connected to the rotor parts of the two slip rings through wires, which can ensure the normal power supply of the two electric heating rods in the rotating state.

[0015] The beneficial effects of the present utility model are as follows:

[0016] 1. The present utility model is provided with a double-shaft heating type stirring mechanism. Through the rotation of two symmetric spiral stirring blades with opposite spiral directions, the added methanol aqueous solution and crude stevioside can be fully stirred, and the two electric heating rods will transfer heat to the two spiral stirring blades. During the rotation and stirring process, the heat of the mixed liquid can be evenly distributed, so that the crystallization of the mixed liquid is more sufficient and uniform, which helps to improve the crystallization efficiency;

[0017] 2. The present utility model is provided with a solid-liquid separation type discharging mechanism, which can effectively separate the waste liquid from the stevioside crystals during the discharging stage, improve the solid-liquid separation efficiency, and thus improve the discharging efficiency. Description of the Drawings

[0018] Figure 1 is a three-dimensional structure schematic diagram of the whole front view of the present utility model;

[0019] Figure 2 is a three-dimensional structure schematic diagram of the vertical section of the present utility model;

[0020] Figure 3 is a three-dimensional enlarged structure schematic diagram of the top area of the crystallization tank in the present utility model;

[0021] Figure 4 is a front view structure schematic diagram of the partial section of the present utility model;

[0022] Figure 5This is a three-dimensional structural schematic diagram of the bottom view of the crystallization tank and the separation cylinder in the present utility model.

[0023] In the figure: 1. Crystallization tank; 2. Biaxial motor; 3. Rotating shaft; 4. Electric heating rod; 5. Spiral stirring blade; 6. Driven bevel gear; 7. Driving bevel gear; 8. Waste liquid collection box; 9. Separation cylinder; 10. Transmission shaft; 11. Auger; 12. Driving motor; 13. Crystal collection box; 14. Feed hopper; 15. Connecting pipe; 16. Solenoid valve; 17. Electric slip ring. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0025] Example 1, referring to Figures 1-4 , a crystallization device for stevioside production, comprising a crystallization tank 1 fixedly connected to the top with a feed hopper 14 and a biaxial heating type stirring mechanism. The biaxial heating type stirring mechanism includes:

[0026] A biaxial motor 2, which is fixedly installed on the outer wall of the center of the top of the crystallization tank 1;

[0027] Two rotating shafts 3 and two electric heating rods 4. The two rotating shafts 3 are sequentially rotatably installed on the top of the crystallization tank 1. The two electric heating rods 4 are sequentially coaxially fixedly installed on the outer walls of the bottoms of the two rotating shafts 3. Electric slip rings 17 are installed on both of the two rotating shafts 3. The two electric heating rods 4 are respectively connected to the rotor parts of the two electric slip rings 17 through wires;

[0028] Two spiral stirring blades 5, which are symmetrically fixedly connected to the outer walls of the two electric heating rods 4. Both of the two spiral stirring blades 5 are located inside the crystallization tank 1, and the spiral directions of the two spiral stirring blades 5 are opposite;

[0029] Two driven bevel gears 6 and two driving bevel gears 7. The two driven bevel gears 6 are sequentially fixedly sleeved on the two rotating shafts 3. The two driving bevel gears 7 are sequentially fixedly sleeved on the two output shafts of the biaxial motor 2 and are symmetrically distributed. The two driving bevel gears 7 are respectively meshed with the two driven bevel gears 6;

[0030] In the specific implementation of this embodiment: The two driving bevel gears 7 are driven by the biaxial motor 2. Subsequently, the two driven bevel gears 6 meshing with the symmetrically distributed two driving bevel gears 7 will drive the two rotating shafts 3 to rotate in opposite directions. Then, the two electric heating rods 4 will drive the two spiral stirring blades 5 thereon to rotate in opposite directions, so as to fully stir the added methanol aqueous solution and crude stevioside. And the two electric heating rods 4 will transfer heat to the two spiral stirring blades 5. During the rotation and stirring process, the heat of the mixed liquid can be ensured to be evenly distributed, thereby making the crystallization of the mixed liquid more sufficient and uniform, which helps to improve the crystallization efficiency.

[0031] Example 2, referring to Figures 1-2 and Figures 4-5 , this embodiment is optimized on the basis of Embodiment 1. Specifically: A crystallization device for stevioside production further includes a solid-liquid separation type discharging mechanism, and the solid-liquid separation type discharging mechanism includes:

[0032] A waste liquid collection box 8 and a crystal collection box 13. The waste liquid collection box 8 is used to collect the waste liquid in the stevioside production process, and the crystal collection box 13 is inserted on one side of the waste liquid collection box 8 for collecting stevioside crystals;

[0033] A separation cylinder 9, the separation cylinder 9 is fixedly and horizontally penetrated and connected in the waste liquid collection box 8. The connections between both sides of the separation cylinder 9 and the waste liquid collection box 8 are both sealed connections, and the bottom of the separation cylinder 9 is provided with uniformly distributed water permeable holes;

[0034] A transmission shaft 10 and an auger 11, the transmission shaft 10 is arranged in the separation cylinder 9, and the auger 11 is welded to the outer wall of the transmission shaft 10;

[0035] A driving motor 12, the driving motor 12 is fixedly installed on the side wall of the separation cylinder 9. The output shaft of the driving motor 12 is connected through a sealed bearing and penetrates through one side inner wall of the separation cylinder 9, and the output shaft of the driving motor 12 is coaxially and fixedly connected to one end of the transmission shaft 10 through a coupling;

[0036] Furthermore, the bottom of the crystallization tank 1 and the top of the separation cylinder 9 are fixedly communicated with the same connecting pipe 15. An electromagnetic valve 16 is installed on the connecting pipe 15, and a drain pipe is fixedly communicated with one side of the waste liquid collection box 8, and a valve is installed on the drain pipe;

[0037] In the specific implementation of this embodiment: after the crystallization of the stevioside solution is completed, the solenoid valve 16 is opened for discharging. At this time, the stevioside crystals and the waste liquid will enter the separation cylinder 9 together from the connecting pipe 15. Then, the auger 11 on the transmission shaft 10 is driven to rotate by the driving motor 12, which can push the stevioside crystals out from the open end of the separation cylinder 9, and the waste liquid will flow out from the water permeable holes uniformly distributed at the bottom of the separation cylinder 9. In this way, the effective separation of the waste liquid and the stevioside crystals can be achieved during the discharging stage, improving the solid-liquid separation efficiency and the discharging efficiency.

[0038] The working principle of the present utility model: First, the methanol aqueous solution and the crude stevioside are added into the crystallization tank 1 from the feed hopper 14. At this time, the two driving bevel gears 7 are driven to rotate by the double-shaft motor 2. Then, the two driven bevel gears 6 meshing with the symmetrically distributed two driving bevel gears 7 will drive the two rotating shafts 3 to rotate in the opposite direction. Subsequently, the two electric heating rods 4 will drive the two spiral stirring blades 5 on them to rotate in the opposite direction, so as to fully stir the added methanol aqueous solution and the crude stevioside. And the two electric heating rods 4 will transfer heat to the two spiral stirring blades 5. During the rotation and stirring process, the heat of the mixed liquid can be evenly distributed, and then the crystallization of the mixed liquid will be more sufficient and uniform, which helps to improve the crystallization efficiency.

[0039] Secondly, after the crystallization of the stevioside solution is completed, the solenoid valve 16 is opened for discharging. At this time, the stevioside crystals and the waste liquid will enter the separation cylinder 9 together from the connecting pipe 15. Then, the auger 11 on the transmission shaft 10 is driven to rotate by the driving motor 12, which can push the stevioside crystals out from the open end of the separation cylinder 9. The discharged stevioside crystals are uniformly collected by the crystal collection box 13, and the waste liquid will flow out from the water permeable holes uniformly distributed at the bottom of the separation cylinder 9 and be uniformly collected in the waste liquid collection box 8. In this way, the effective separation of the waste liquid and the stevioside crystals can be achieved during the discharging stage, improving the solid-liquid separation efficiency and the discharging efficiency.

[0040] The above is only the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. A crystallization device for stevioside production, comprising a crystallization tank (1) fixedly connected to a feed hopper (14) at the top, characterized in that, It also includes a biaxial heating type stirring mechanism and a solid-liquid separation type discharging mechanism; The biaxial heating type stirring mechanism includes a biaxial motor (2) fixedly installed on the outer wall of the center of the top of the crystallization tank (1), two rotating shafts (3) sequentially rotatably installed on the top of the crystallization tank (1), two electric heating rods (4) sequentially coaxially fixedly installed on the outer walls of the bottoms of the two rotating shafts (3), two spiral stirring blades (5) symmetrically fixedly connected to the outer walls of the two electric heating rods (4), two driven bevel gears (6) sequentially fixedly sleeved on the two rotating shafts (3), and two driving bevel gears (7) sequentially fixedly sleeved on the two output shafts of the biaxial motor (2); The solid-liquid separation type discharging mechanism includes a waste liquid collection box (8), a crystal collection box (13) inserted on one side of the waste liquid collection box (8), a separation cylinder (9) fixedly penetrating and connecting transversely inside the waste liquid collection box (8), a transmission shaft (10) arranged inside the separation cylinder (9), an auger (11) welded on the outer wall of the transmission shaft (10), and a driving motor (12) fixedly installed on the side wall of the separation cylinder (9).

2. The crystallization device for stevioside production according to claim 1, characterized in that, Both of the two spiral stirring blades (5) are located inside the crystallization tank (1), the spiral directions of the two spiral stirring blades (5) are opposite, and the two driving bevel gears (7) are respectively meshed with the two driven bevel gears (6).

3. A crystallization device for stevioside production according to claim 1, characterized in that, The output shaft of the driving motor (12) is connected through a sealed bearing to the inner wall of one side of the separation cylinder (9) in a penetrating manner, and the output shaft of the driving motor (12) is coaxially and fixedly connected to one end of the transmission shaft (10) through a coupling.

4. A crystallization device for stevioside production according to claim 1, characterized in that, Both of the connecting parts on the two sides between the separation cylinder (9) and the waste liquid collection box (8) are sealed connections, and the bottom of the separation cylinder (9) is provided with uniformly distributed water permeable holes. The bottom of the crystallization tank (1) and the top of the separation cylinder (9) are fixedly communicated with the same connecting pipe (15), and a solenoid valve (16) is installed on the connecting pipe (15).

5. A crystallization device for stevioside production according to claim 1, characterized in that, One side of the waste liquid collection box (8) is fixedly communicated with a drain pipe, and a valve is installed on the drain pipe.

6. The crystallization device for stevioside production according to claim 1, characterized in that, Slip rings (17) are installed on both of the two rotating shafts (3), and both of the two electric heating rods (4) are respectively connected to the rotor parts of the two slip rings (17) through wires.

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