Mixing device for producing compound coloring agent

Abstract

The mixing device for producing the compound coloring agent comprises a tank body and a tank cover which are connected into a whole through a flange, the tank cover is provided with a feeding port, and the bottom of the tank body is provided with a discharging port; a mounting frame, a rotary power mechanism, a stirring shaft and a stirring unit are arranged on the tank cover; the tank cover is provided with an upper bracket, a nitrogen supply ring pipe, a nitrogen outlet hole and a tank body air emptying port; a lower bracket, an argon supply ring pipe and an argon outlet hole are arranged on the tank body; a heat exchanger is also sleeved on the outer wall of the middle part of the tank body; the mixing device is provided with a nitrogen and argon dual inert gas protection system, nitrogen can be uniformly introduced into the upper part of the tank body through the annular pipe and the gas supply hole of the nitrogen supply assembly on the tank cover, and air in the tank body is naturally discharged from the air discharge port of the tank body, so that the contact between oxygen and materials is reduced, the oxygen is effectively isolated, and the material quality is improved. Oxidative deterioration of the coloring agent is prevented, and color stability and quality safety of the product are guaranteed to the maximum extent.

Description

A mixing device for the production of compound colorants Technical Field

[0001] This utility model relates to the field of colorant mixing technology, specifically a mixing device for producing compound colorants. Background Technology

[0002] In the production of compound colorants, the mixing process is a key link to ensure product quality. Traditional compound colorant mixing equipment has revealed many problems in actual production.

[0003] First, in terms of mixing uniformity, due to the limitations of the stirring structure and stirring method, it is often difficult to achieve full mixing of the colorant components at the molecular level. Different components are prone to local agglomeration or stratification, resulting in uneven product color and large batch-to-batch quality differences, which cannot meet the strict requirements of the high-end market for product consistency.

[0004] Secondly, regarding the prevention of oxidative deterioration, some components in compound colorants are extremely sensitive to oxygen. If oxygen cannot be effectively isolated during the mixing process, oxidation reactions can easily occur, causing changes in the color of the colorant and even producing harmful substances, seriously affecting the quality and performance of the product. Most existing mixing devices lack effective inert gas protection measures or only employ a single inert gas protection method, failing to remove oxygen comprehensively and without blind spots throughout the entire mixing process, making it difficult to guarantee product stability.

[0005] In order to overcome the many shortcomings of the traditional compound colorant mixing device and meet the growing market demand for high-quality compound colorants, it is necessary to develop a new type of mixing device for compound colorant production that has efficient mixing, good inert gas protection, precise temperature control and convenient sampling and testing functions. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to address the shortcomings of the prior art by providing a mixing device for the production of compound colorants that can minimize the secondary oxidation of colorants during compounding and blending, thereby affecting the quality.

[0007] The technical problem to be solved by this utility model is achieved through the following technical solution: a mixing device for producing compound colorants, the mixing device including a tank body and a tank cover connected by flanges, a feeding port on the tank cover and a discharge port at the bottom of the tank body;

[0008] A mounting bracket is installed on the top outer wall of the can lid, and a rotary power mechanism is fixedly installed on the mounting bracket. A stirring shaft is connected to the power output end of the rotary power mechanism via a coupling. The stirring shaft is rotatably connected to the can lid and extends into the can body. A stirring unit for dispersing the colorant is installed on the stirring shaft.

[0009] A nitrogen supply assembly is provided on the tank cover, which includes several upper supports and nitrogen supply ring pipes. The upper supports are fixed on the inner wall of the tank cover below the mounting frame, and the nitrogen supply ring pipes are fixed on the upper supports. Each nitrogen supply ring pipe is provided with a nitrogen outlet hole. An air vent is also provided above the outlet of the tank body.

[0010] An argon gas supply assembly is installed on the tank body, which includes several lower supports and argon gas supply ring pipes. The lower supports are fixed on the bottom inner wall of the tank body, and the argon gas supply ring pipes are fixed on the lower supports. Each argon gas supply ring pipe is provided with an argon gas outlet.

[0011] A heat exchanger is also installed on the outer wall of the middle part of the tank.

[0012] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the mixing device for producing compound colorant described above has a nitrogen supply pipe installed on the outer wall of the can lid, the nitrogen supply pipe extends into the can lid and is connected to several nitrogen supply ring pipes.

[0013] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the mixing device for producing compound colorant described above has an argon gas supply pipe installed on the outer wall of the tank, the argon gas supply pipe extending into the tank and connected to several of the argon gas supply ring pipes.

[0014] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the mixing device for producing compound colorants described above, wherein the stirring unit includes an upper stirring assembly and a lower stirring assembly.

[0015] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the mixing device for producing compound colorant described above, wherein the upper stirring assembly includes a pair of trapezoidal stirring plates, the pair of trapezoidal stirring plates are symmetrically fixed on the outer peripheral surface of the middle part of the stirring shaft, and a number of waist-shaped flow grooves are provided on the trapezoidal stirring plates.

[0016] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the mixing device for producing compound colorants described above, wherein the lower stirring assembly includes several sets of stirring rods, and the several sets of stirring rods are fixed at intervals on the bottom outer circumference of the stirring shaft.

[0017] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the mixing device for producing compound colorants described above also has a sampling port on the outer wall of the middle part of the tank.

[0018] Compared with the prior art, the beneficial technical effects of this utility model are:

[0019] (1) The mixing device is equipped with a dual inert gas protection system of nitrogen and argon. Nitrogen can be evenly introduced into the upper part of the tank through the ring pipe and gas supply hole of the nitrogen supply assembly on the tank cover, while the air in the tank is naturally discharged from the air vent of the tank, thereby reducing the contact between oxygen and materials. The argon supply assembly at the bottom of the tank supplies gas from bottom to top. The two work together to form an all-round inert gas barrier, effectively isolating oxygen, preventing the colorant from oxidizing and deteriorating, and ensuring the stability of product color and quality safety to the greatest extent.

[0020] (2) The upper and lower mixing assemblies are combined to form a composite mixing structure. The trapezoidal mixing plate of the upper mixing assembly is paired with the waist-shaped flow channel. During mixing, it applies shearing and squeezing action to the material, which can effectively break up agglomerated particles and promote micro-mixing. The multiple sets of mixing rods of the lower mixing assembly are arranged in layers to achieve full coverage mixing from the bottom to the upper middle part of the tank. The combination of the two forms an all-round, multi-level mixing mode. With the stable and efficient rotary power transmission system, it can greatly improve the uniformity and stability of mixing, ensure that the components of the compound colorant are fully dispersed and uniformly integrated, effectively reduce batch quality differences, and meet the market's requirements for product consistency. Attached Figure Description

[0021] Figure 1 is a schematic diagram of the main structure of this utility model;

[0022] Figure 2 is a top view of the argon gas supply ring pipe of this utility model.

[0023] In the diagram: 1. Tank body; 2. Tank cover; 3. Feed port; 4. Discharge port; 5. Sampling port; 6. Mounting frame; 7. Rotary power mechanism; 8. Stirring shaft; 9. Trapezoidal stirring plate; 10. Waist-shaped flow channel; 11. Stirring rod; 12. Upper support; 13. Nitrogen supply ring pipe; 14. Nitrogen outlet; 15. Tank air vent; 16. Nitrogen supply pipe; 17. Lower support; 18. Argon supply ring pipe; 19. Argon outlet; 20. Air vent pipe; 21. Heat exchanger; 22. Argon supply pipe. Detailed Implementation

[0024] The specific technical solutions of this utility model are further described below with reference to the accompanying drawings, so as to enable those skilled in the art to further understand this utility model, without constituting a limitation on its rights.

[0025] Example 1, referring to Figures 1-2, is a mixing device for producing compound colorants. The mixing device includes a tank body 1 and a tank cover 2 connected by flanges. After the tank body 1 and the tank cover 2 are connected by flanges, they form a roughly spherical kettle structure. A feeding port 3 is provided on the tank cover 2 for adding the colorant to be compounded. A discharge port 4 is provided at the bottom of the tank body 1 for discharging the mixed material. A sampling port 5 is also provided on the outer wall of the middle part of the tank body 1. When it is necessary to test the composition of the mixed colorant, a sample can be taken from the sampling port 5.

[0026] A mounting bracket 6 is installed on the top outer wall of the can lid 2. The mounting bracket 6 is formed into a roughly square frame structure and can be welded and fixed to the top outer wall of the can lid 2. A rotary power mechanism 7 is fixedly installed on the mounting bracket 6. The rotary power mechanism 7 can be a rotary motor, which is existing technology and its specifications and models can be selected according to the usage requirements. A stirring shaft 8 is driven to the power output end of the rotary power mechanism 7 through a coupling. The stirring shaft 8 is rotatably connected to the can lid 2 and extends into the can body 1. A stirring unit for dispersing the colorant is installed on the stirring shaft 8. The stirring unit includes an upper stirring assembly and a stirring unit for dispersing the colorant. The lower stirring assembly includes a pair of trapezoidal stirring plates 9, which are generally trapezoidal plate structures. The pair of trapezoidal stirring plates 9 are symmetrically fixed on the outer peripheral surface of the middle part of the stirring shaft 8. Several waist-shaped flow grooves 10 are provided on the trapezoidal stirring plates 9. The waist-shaped flow grooves 10 are generally waist-shaped groove structures, and their size and specifications can be selected according to the usage requirements. The lower stirring assembly includes several sets of stirring rods 11, which are generally cylindrical rod structures. The several sets of stirring rods 11 are fixed on the bottom outer peripheral surface of the stirring shaft 8 at intervals.

[0027] To prevent unnecessary oxidation of the colorant by the air inside the tank 1, a nitrogen supply assembly is installed on the tank cover 2. This assembly includes several upper supports 12 and nitrogen supply ring pipes 13. The upper supports 12 are roughly square rod-shaped structures that can be welded and fixed to the inner wall of the tank cover 2. The upper supports 12 are fixed to the inner wall of the tank cover 2 below the mounting bracket 6. The nitrogen supply ring pipes 13 are fixed to the upper supports 12, and each nitrogen supply ring pipe 13 has a nitrogen outlet 14. An air vent 15 is provided above the material inlet 4. A nitrogen supply pipe 16 is installed on the outer wall of the can cover 2. The nitrogen supply pipe 16 extends into the can cover 2 and is connected to several nitrogen supply ring pipes 13. Before mixing and dispersing the colorant, we can fill the inside of the can 1 with nitrogen. Since nitrogen is slightly lighter than air, the air will naturally be discharged from the air vent 15. Therefore, an inert protective atmosphere can be created in the can 1 to avoid oxidation of the colorant.

[0028] An argon gas supply assembly is provided on the tank body 1, which includes several lower supports 17 and argon gas supply ring pipes 18. The lower supports 17 are formed into a roughly square rod structure and are fixed to the bottom inner wall of the tank body 1. The argon gas supply ring pipes 18 are fixed on the lower supports 17. An argon gas supply pipe 22 is installed on the outer wall of the tank body 1. The argon gas supply pipe 22 extends into the tank body 1 and is connected to several of the argon gas supply ring pipes 18. Each argon gas supply ring pipe 18 is provided with an argon gas outlet 19.

[0029] In other words, not only can nitrogen be used as an antioxidant gas, but argon can also be used as a further antioxidant gas. For example, if the colorant is a nano pigment or a natural antioxidant pigment such as anthocyanin, which are easily oxidized, argon can be introduced into the tank 1 from the bottom up before adding the material to create an inert protective atmosphere in the tank 1. An air exhaust pipe 20 can be reserved at the top of the tank cover 2. In addition, during the stirring and dispersion process, intermittent introduction of argon can also achieve the effect of auxiliary stirring.

[0030] In addition, in order to improve the mixing effect of the colorant, a heat exchanger 21 is installed on the outer wall of the middle part of the tank 1. The heat exchanger 21 can be a jacketed heat exchanger 21, which is existing technology. Its specifications and models can be selected according to the usage requirements.

[0031] The mixing device for producing compound colorants in Example 1 operates on the following principle:

[0032] (1) When the mixture contains low-sensitivity colorant components, nitrogen purging is used:

[0033] (1.1) Nitrogen purging and exhaust: Nitrogen is introduced into the top nitrogen supply ring pipe 13 through the nitrogen supply pipe 16. The gas diffuses downward from the gas supply hole on the ring pipe. Since nitrogen is slightly lighter than air, the air in the tank is gradually squeezed out from the air vent 15 of the tank. We can detect the gas composition at the air vent 15 of the tank. When the oxygen concentration at the air vent 15 of the tank is <1%, the purging is stopped.

[0034] (1.2) Pressure maintenance: During the mixing process, a slight positive pressure of 0.01~0.03MPa should be maintained to prevent air from seeping in. An automatic pressure relief valve and pressure gauge can be installed on the tank cover 2. These are existing technologies and their specifications and models can be selected according to the usage requirements.

[0035] (2) When the mixture contains highly sensitive colorant components, argon gas replacement should be used:

[0036] (2.1) Bottom Argon Supply: Argon gas is introduced through the argon gas supply ring pipe 18. The gas fills the tank 1 from bottom to top. Since the density of argon gas is slightly greater than that of air, the air is discharged from the reserved exhaust port at the top. We can test the gas composition of the air exhaust pipe 20. When the oxygen concentration is <0.1%, it is acceptable.

[0037] (2.2) Dynamic protection: Argon gas can be intermittently introduced during the mixing process to maintain an inert environment and assist stirring through bubbling;

[0038] (2) Mixing and dispersing process:

[0039] (2.1) Feeding: Add colorant and auxiliary materials through feeding port 3;

[0040] (2.2) Stirring start: The rotary motor drives the stirring shaft 8. The trapezoidal stirring plate 9 of the upper stirring assembly and the waist-shaped flow channel 10 work together to generate shear force to break up particle agglomeration. The multi-layer stirring rod 11 of the lower stirring assembly enhances convection and ensures that the bottom material is uniform.

[0041] (2.3) Temperature control: The jacketed heat exchanger 21 is circulated with a cold / hot medium to regulate the temperature inside the tank, for example to prevent the natural pigments from being degraded at high temperatures;

[0042] (3) Sampling and testing: A small amount of material can be taken through the middle sampling port 5 to test the mixing uniformity or color consistency;

[0043] (4) Discharge: After mixing, the finished product is discharged from the bottom discharge port 4. The inert gas is kept covering the entire process.

Claims

1. A mixing apparatus for producing compound colorants, characterized in that: The mixing device includes a tank body and a tank cover connected as a single unit by flanges. A feed port is located on the tank cover, and a discharge port is located at the bottom of the tank body. A mounting bracket is installed on the top outer wall of the tank cover, and a rotary power mechanism is fixedly mounted on the mounting bracket. A stirring shaft is driven to the power output end of the rotary power mechanism via a coupling. The stirring shaft is rotatably connected to the tank cover and extends into the tank body. A stirring unit for dispersing the colorant is mounted on the stirring shaft. A nitrogen supply assembly is provided on the tank cover, which includes several upper supports and a nitrogen supply... The gas ring pipe is fixed to the inner wall of the tank cover below the mounting frame. The nitrogen gas supply ring pipe is fixed to the upper support. Each nitrogen gas supply ring pipe has a nitrogen outlet. An air vent is also provided above the tank outlet. An argon gas supply assembly is installed on the tank, which includes several lower supports and argon gas supply ring pipes. The lower supports are fixed to the bottom inner wall of the tank. The argon gas supply ring pipes are fixed to the lower supports. Each argon gas supply ring pipe has an argon gas outlet. A heat exchanger is also installed on the outer wall in the middle of the tank.

2. The mixing apparatus for producing compound colorants according to claim 1, characterized in that: A nitrogen supply pipe is installed on the outer wall of the can lid, extending into the can lid and connecting to several nitrogen supply ring pipes.

3. The mixing apparatus for producing compound colorants according to claim 1, characterized in that: An argon gas supply pipe is installed on the outer wall of the tank, extending into the tank and connecting to several argon gas supply ring pipes.

4. The mixing apparatus for producing compound colorants according to claim 1, characterized in that: The stirring unit includes an upper stirring assembly and a lower stirring assembly.

5. A mixing apparatus for producing compound colorants according to claim 4, characterized in that: The upper stirring assembly includes a pair of trapezoidal stirring plates, which are symmetrically fixed on the outer circumference of the middle part of the stirring shaft. Several waist-shaped flow grooves are formed on the trapezoidal stirring plates.

6. The mixing apparatus for producing compound colorants according to claim 4, characterized in that: The lower stirring assembly includes several sets of stirring rods, which are fixed at intervals on the bottom outer circumference of the stirring shaft.

7. A mixing apparatus for producing compound colorants according to claim 1, characterized in that: A sampling port is also provided on the outer wall in the middle of the tank.

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