A colloid mill device for malt grinding

Abstract

The utility model discloses a colloid mill device for malt grinding applied to the field of food processing, three colloid mills are closed and connected in series, and are coarse grinder, fine grinder and fiber grinder in turn, and the grinding surface patterns of the three colloid mills are vertical lines, inclined lines and grid lines respectively. The pipeline of the cooling system is connected with the liquid inlet pipe and the liquid outlet pipe of the colloid mill. The stator of the colloid mill has a hollow cooling cavity, the liquid inlet and outlet are arranged at the lower part and the upper part respectively, and are preferably tangentially communicated with the cooling cavity, the outer surface of the inner wall of the stator is provided with spiral blades, and a built-in sealed heat preservation layer is arranged on the upper side and the outer side of the cooling cavity. The utility model greatly improves the malt grinding efficiency and realizes the grinding requirement that the grinding cavity is lower than 60 DEG C.

Description

Technical Field

[0001] This utility model is applied in the field of food processing and relates to a colloid mill for grinding powder particles, specifically a colloid mill device for low-temperature grinding of organic selenium malt. Background Technology

[0002] Colloid mills, as grinding machinery, are widely used in various industries such as food, chemical, and pharmaceutical. With their high-efficiency grinding and emulsification capabilities, large throughput, narrow particle size distribution, compact structure, simple operation, environmental friendliness and energy saving, multi-functional applications, and customized production, they have become indispensable equipment in various industries. Colloid mills are easy to install and maintain, and can perform multiple functions such as wet ultrafine grinding, pulverization, emulsification, mixing, dispersion, homogenization, and stirring. The applicant grinds organic selenium malt into micro-powder to create a new type of water-infused health beverage. Currently, the working temperature inside the grinding chamber of the colloid mill cannot meet the temperature requirements for grinding below 60℃, necessitating sufficient cooling and improved grinding efficiency. Utility Model Content

[0003] The technical problem solved by this utility model is to provide a colloid mill device for malt grinding, in which multiple colloid mills are connected in series to enhance the cooling of the grinding chamber and achieve a grinding temperature of less than 60°C.

[0004] The technical solution adopted in this utility model is as follows: The colloid mill device for malt grinding includes a cooling system and a colloid mill. Three colloid mills are connected in series in a closed manner, and from the direction of malt flow, they are arranged in sequence as a coarse mill, a fine mill, and a fiber mill. The coarse mill has a vertical grinding surface texture to grind large particles into small particles; the fine mill has an inclined grinding surface texture to grind small particles into microparticles; and the fiber mill has a grid-like grinding surface texture to pulverize dietary fiber. The cooling system includes a compressor and a pipeline for conveying coolant, which connects the inlet and outlet pipes of each colloid mill. The stator of the colloid mill is hollow, and the outer and inner walls of the stator, together with the inner cover, form a cooling chamber. The inlet of the cooling chamber is located at the lower part of the cooling chamber, and the outlet is located at the upper part of the cooling chamber. Spiral blades are provided on the outer surface of the inner wall of the stator. A heat insulation layer is provided on the upper side and the outer circumference of the cooling chamber.

[0005] In one embodiment, the bottom discharge pipe of the coarse grinding mill is connected to the top feed pipe of the fine grinding mill, and the bottom discharge pipe of the fine grinding mill is connected to the top feed pipe of the fiber mill. The upper feeding hoppers of the fine grinding mill and the fiber mill are sealed with top covers, and the feed pipes are evenly distributed around the outer circumference of the top cover. A cooling jacket is provided on the outer conical surface of the feeding hopper, and the liquid inlet of the cooling jacket is connected to the liquid outlet of the cooling chamber via a connecting pipe. The liquid outlet of the cooling jacket is connected to the liquid outlet pipe. An insulation layer is provided on the outside of the cooling jacket.

[0006] Furthermore, the aforementioned insulation layer has an internal seal to prevent bacterial growth.

[0007] Furthermore, the inlet and outlet of the cooling chamber are tangentially connected to the cooling chamber. The inlet is located below the spiral blades, and the outlet is located above the spiral blades, which can enhance the uniform cooling of the stator by the coolant.

[0008] Furthermore, the inner diameter of the outlet pipe is not less than twice the inner diameter of the inlet pipe, in order to reduce the resistance to the flow of coolant in the cooling chamber.

[0009] In another embodiment, the discharge pipes of the three colloid mills are located on the lower side, the feeding hopper is not equipped with cooling, and the liquid outlet of the cooling chamber is directly connected to the discharge pipe.

[0010] The beneficial effects of this invention are as follows: This invention utilizes three colloid mills connected in series, which greatly improves the malt grinding efficiency. The enhanced heat exchange cooling structure, combined with a low-temperature coolant, achieves the grinding requirement of the grinding chamber being below 60°C, ensuring that the organic selenium in the malt is not damaged. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of Example 1; Figure 2 This is a schematic diagram of the cooling structure of a colloid mill; Figure 3 This is a schematic diagram of the structure of Example 2; In the diagram: 1-coarse grinding mill, 2-fine grinding mill, 3-fiber mill, 4-storage tank, 5-compressor; 21-Feed pipe, 22-Top cover, 23-Feeding hopper, 24-Cooling jacket, 25-Insulation layer, 26-Liquid outlet pipe, 27-Top cover, 28-Inner cover, 29-Cooling chamber, 30-Spiral blade, 31-Liquid inlet pipe, 32-Base, 33-Transmission device, 34-Discharge pipe, 35-Shaft, 36-Rotor, 37-Outer cylinder, 38-Stator outer wall, 39-Stator inner wall, 40-Connecting pipe. Detailed Implementation

[0012] This utility model is an improvement upon the original product of the colloid mill manufacturer, addressing the structural and performance requirements proposed by the applicant. This utility model focuses on describing the improved structure; details regarding the transmission, sealing, and positioning structures of the colloid mill are not provided and fall under the prior art of the manufacturer. In the attached drawings, solid arrows indicate the flow direction of the malt material, and dashed arrows indicate the flow direction of the coolant. Example 1

[0013] The structure of the colloid mill apparatus for malt grinding in this embodiment is shown in the attached figure. Figure 1As shown, the device includes three colloid mills connected in series in a closed configuration: a coarse mill 1, a fine mill 2, and a fiber mill 3. The biggest difference between the three mills lies in the texture of their grinding chambers, specifically the different textures on the rotor and stator grinding surfaces. The coarse mill 1 has vertical grooves, meaning the material falls in the same direction, grinding granular materials into fine particles. The fine mill 2 has inclined grooves, grinding fine particles into micro-powder. The fiber mill 3 has a grid pattern, cutting slightly longer dietary fibers into smaller segments. Granular malt, after passing through this colloid mill device, is ground into micron-sized powder, making it convenient to mix with warm water and promoting digestion and absorption. The reason for dividing the grinding of malt into three stages and different textures is threefold: first, to improve grinding efficiency: changing the circulating grinding of one colloid mill to the unidirectional flow grinding of three colloid mills greatly improves grinding efficiency; second, to reduce the need for temperature: grinding the same weight of malt simultaneously with three colloid mills results in shorter running time and relatively less heat generation, which helps to control the temperature below 60℃; and third, to meet functional requirements: the coarse mill grinds large particles into small particles, the fine mill grinds small particles into microparticles, and the fiber mill pulverizes the dietary fiber in the microparticles.

[0014] To ensure the organic selenium in the malt is not destroyed, the temperature during colloid milling must not exceed 60℃. Therefore, a cooling structure for the colloid mill was designed, and a cooling system was added. The cooling system includes a compressor 5 and pipelines for supplying coolant. The pipelines connect to the inlet pipe 31 and outlet pipe 26 of each colloid mill. The compressor 5 can be an air conditioning compressor, and the coolant can be air conditioning refrigerant or automotive coolant. The temperature of the coolant should preferably be below 0℃ to enhance cooling of the colloid mill.

[0015] The cooling structure of the colloid mill is shown in the attached figure. Figure 2 As shown, the internal cooling structures of the coarse grinding mill 1, fine grinding mill 2, and fiber grinding mill 3 are identical. The stator of the colloid mill is hollow. The outer stator wall 38, the inner stator wall 39, and the inner cover 28 form a cooling chamber 29. The liquid inlet pipe 31 connects to the liquid inlet of the cooling chamber 29, which is located at the lower part of the cooling chamber 29. The liquid outlet of the cooling chamber 29 is located at the upper part of the cooling chamber 29, which conforms to the natural law that the density of the coolant decreases after heat exchange and it is easier to float, and also enhances the cooling of the lower part of the grinding chamber. Spiral blades 30 are provided on the outer surface of the inner stator wall 39. These spiral blades 30 can increase the heat dissipation area of ​​the inner stator wall and also force the coolant to flow turbulently, thereby improving the heat exchange efficiency. The temperature of the coolant is lower than the room temperature. In order to reduce the heat exchange between the coolant and the external space, an internal insulation layer 25 is provided on the upper side and the outer circumference of the cooling chamber, and sealed with sealant. Specifically, a heat insulation layer 25 is provided between the top cover 27 and the inner cover 28, and a heat insulation layer 25 is provided between the outer cylinder 37 and the stator outer wall 38. The heat insulation layer enhances the cooling of the grinding chamber by the coolant, and the internal seal of the heat insulation layer is to prevent bacteria from growing in the gaps of the heat insulation layer.

[0016] The discharge pipe 34 at the bottom of the coarse grinding mill 1 is connected to the feed pipe 21 at the top of the fine grinding mill 2. The discharge pipe 34 at the bottom of the fine grinding mill 2 is also connected to the feed pipe 21 at the top of the fiber mill 3. The discharge pipe 34 at the bottom of the fiber mill 3 is connected to the storage tank 4. A cover 22 is sealed over the upper feeding hopper 23 of both the fine grinding mill 2 and the fiber mill 3. The feed pipes 21 are evenly distributed around the outer circumference of the cover 22, facilitating the flow of material from the inclined surface of the feeding hopper into the grinding chamber. This forms a series closed connection of the colloid mill device. After the malt enters the colloid mill device, it does not come into contact with air, avoiding material contamination. A cooling jacket 24 is installed on the outer conical surface of the feeding hopper 23 of both the fine grinding mill 2 and the fiber mill 3. The inlet of the cooling jacket 24 is connected to the outlet of the cooling chamber 29 by a connecting pipe 40, and the outlet of the cooling jacket 24 is connected to the outlet pipe 26. The cooling jacket 24 is surrounded by an insulation layer 25. The insulation layer is sealed to prevent the coolant from exchanging heat with the outside air. The top cover seals the feeding hopper to prevent heat dissipation from convection inside the feeding hopper. When the material flows down the inclined surface of the feeding hopper, it exchanges heat with the coolant to achieve material cooling. Low-temperature materials also help to reduce the grinding temperature of the colloid mill.

[0017] In this embodiment, frozen malt and ice are fed into the grinding chamber of coarse mill 1 through the feeding hopper. The motor and transmission device 33 of coarse mill 1 are started. The motor and grinding media are fixedly mounted on the base 32. The transmission device 33 drives the rotor 36 to rotate at high speed through the rotating shaft 35. The malt is pulverized into fine powder colloid in the grinding chamber between the rotor 36 and the stator. It flows into the feed pipe 21 of fine mill 2 through the discharge pipe 34. The fine powder colloid flows down the inclined surface of the feeding hopper, cools down, and enters the grinding chamber of fine mill 2. It is pulverized into micro powder colloid in the grinding chamber of fine mill 2. It flows into the feed pipe 21 of fiber mill 3 through the discharge pipe 34. The micro powder colloid flows down the inclined surface of the feeding hopper, cools down, and enters the grinding chamber of fiber mill 3. After the dietary fiber is pulverized, the colloid product falls into the storage tank 4. Throughout the grinding process, the compressor 5 works to provide coolant to each colloid mill, ensuring that the temperature of the grinding chamber of each colloid mill does not exceed 60°C.

[0018] To enhance the upward spiral flow of the coolant, the inlet and outlet of the cooling chamber should preferably be tangentially connected to the cooling chamber. The inlet should preferably be located below the spiral vane 30, and the outlet should preferably be located above the spiral vane 30. This allows the coolant to enter and exit the cooling chamber tangentially, forming a rotating circular flow around the spiral vane 30, resulting in uniform stator cooling. To enhance heat exchange and reduce the resistance at the coolant outlet, the inner diameter of the outlet pipe 26 should not be less than twice the inner diameter of the inlet pipe 31. Example 2

[0019] This embodiment describes the colloid mill apparatus used during the initial trial production phase, as shown in the attached diagram. Figure 3As shown, it still consists of three colloid mills connected in a closed series. The differences from Example 1 are: 1) the discharge pipe of the colloid mill is located on the lower side; 2) the feed hoppers of the fine mill 2 and the fiber mill 3 are not cooled, meaning the liquid outlet of the cooling chamber is directly connected to the discharge pipe. Other structures, such as the texture of the rotor and stator grinding surfaces and the cooling structure of the colloid mill grinding chamber, remain consistent. Compared to Example 1, cleaning the grinding chamber is slightly more troublesome in this example, placing a burden on subsequent low-temperature drying, and it occupies a larger area. After consultation with the colloid mill manufacturer, it was modified to the structure of Example 1.

[0020] The discharge pipe 34 at the bottom of the fiber mill 3 can be disconnected from the storage tank 4 and directly enter the next process. The storage tank is only for temporary storage.

[0021] The three colloid mills described in this utility model are distinguished by their functions. The specific number is not limited to three and may include more than three, such as two coarse mills simultaneously grinding large particles into small particles, or two fine mills simultaneously grinding small particles into microparticles, or two fiber mills simultaneously pulverizing dietary fiber.

[0022] This invention utilizes three colloid mills connected in series to significantly improve malt grinding efficiency. Each colloid mill is designed with a cooling structure to enhance heat exchange, and combined with a low-temperature coolant, achieving a grinding temperature below 60°C in the grinding chamber, thus ensuring that the organic selenium in the malt is not damaged. The prepared colloidal product is then dried and sterilized at a low temperature before being packaged into a water-based health beverage.

Claims

1. A colloid mill apparatus for malt grinding, characterized in that: It includes a cooling system and a colloid mill; the three colloid mills are connected in series in a closed manner, and from the direction of malt flow, they are a coarse mill, a fine mill and a fiber mill in sequence; the grinding surface texture of the coarse mill is vertical, the grinding surface texture of the fine mill is inclined, and the grinding surface texture of the fiber mill is grid pattern. The cooling system includes a compressor and pipelines for delivering coolant, the pipelines connecting the inlet and outlet pipes of each of the colloid mills; The stator of the colloid mill is hollow. The stator outer wall (38) and stator inner wall (39) together with the inner cover (28) form a cooling chamber (29). The liquid inlet of the cooling chamber (29) is located at the lower part of the cooling chamber, and the liquid outlet is located at the upper part of the cooling chamber. Spiral blades (30) are provided on the outer surface of the stator inner wall (39). A heat insulation layer is provided on the upper side and the outer circumference of the cooling chamber (29).

2. The colloid mill apparatus for malt grinding according to claim 1, characterized in that: The bottom discharge pipe of the coarse grinding mill is connected to the top feed pipe of the fine grinding mill, and the bottom discharge pipe of the fine grinding mill is connected to the top feed pipe of the fiber mill; the upper feed hoppers of the fine grinding mill and the fiber mill are sealed with a cover, and the feed pipes are evenly distributed around the outer circumference of the cover. A cooling sleeve (24) is provided on the outer conical surface of the feeding hopper. The liquid inlet of the cooling sleeve (24) is connected to the liquid outlet of the cooling chamber (29) by a connecting pipe (40). The liquid outlet of the cooling sleeve (24) is connected to the liquid outlet pipe. An insulation layer is provided on the outside of the cooling sleeve (24).

3. The colloid mill apparatus for malt grinding according to claim 1, characterized in that: The insulation layer has an internal seal.

4. The colloid mill apparatus for malt grinding according to claim 1, characterized in that: The inlet and outlet of the cooling chamber are tangentially connected to the cooling chamber. The inlet is located below the spiral blade (30), and the outlet is located above the spiral blade (30).

5. The colloid mill apparatus for malt grinding according to claim 1, characterized in that: The inner diameter of the outlet pipe is not less than twice the inner diameter of the inlet pipe.

6. The colloid mill apparatus for malt grinding according to claim 1, characterized in that: The discharge pipes of the three colloid mills are located on the lower side, and the liquid outlet of the cooling chamber is directly connected to the discharge pipe.

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