Preparation process of xylitol fermented yogurt powder

Abstract

The application discloses a preparation process of xylitol fermented yoghourt powder and relates to the technical field of milk powder production equipment. The preparation process comprises the following steps: ingredient preparation, fermentation and homogenization, concentration, spray drying of the material, fluidized bed cooling to room temperature, and uniform mixing of the material in a spiral mixer to obtain the xylitol fermented yoghourt powder. The application is combined with homogenization stirring sterilization equipment to produce the xylitol fermented yoghourt powder. In the process of homogenizing the mixture, the mixture can be prevented from adhering to the inner wall of the homogenizer shell and the outer wall of the cylindrical lampshade, the base material and the inner wall of the equipment can be fully sterilized by the ultraviolet disinfection lamp, and then the mixture can be discharged outward through the discharge pipe, so that the preparation efficiency of the xylitol fermented yoghourt powder is effectively improved, and the waste caused by the mixture residue is reduced.

Description

Technical Field

[0001] This invention relates to the field of milk powder production equipment technology, specifically a preparation process for xylitol fermented yogurt powder. Background Technology

[0002] Xylitol fermented yogurt powder is a type of milk powder prepared by mixing ingredients, homogenizing, sterilizing, concentrating, spray drying, cooling, and then mixing evenly in a spiral mixer. Homogenization, also known as slurry homogenization, is a process that micronizes and homogenizes the dispersions in a suspension (or emulsion) system. This process simultaneously reduces the size of the dispersions and improves the uniformity of their distribution. During the homogenization process, the raw material mixture of milk powder needs to be homogenized using a homogenizer.

[0003] In existing homogenization processes, the mixture becomes increasingly viscous, resulting in a large amount of residue adhering to the inner wall of the homogenizer. When the homogenized mixture is discharged to subsequent processing equipment, a significant amount remains on the homogenizer's inner wall, leading to waste and negatively impacting the homogenization of subsequent mixtures. Furthermore, the homogenized mixture requires sterilization before fermentation and concentration. Current sterilization techniques for yogurt products involve at least two crucial steps: sterilization before fermentation and sterilization before reusing the production equipment. To protect the probiotic equipment, existing technologies often involve heating the substrate to 60°C–80°C—not boiling, but enough to kill most bacteria—before cooling to around 40°C for inoculation and fermentation. However, this type of sterilization is not thorough; moreover, it fails to achieve complete sterilization of the equipment's interior.

[0004] To improve the preparation efficiency of xylitol-fermented yogurt powder, effectively reduce waste of mixtures, and enhance sterilization effect, we propose a preparation process for xylitol-fermented yogurt powder. Summary of the Invention

[0005] The purpose of this invention is to provide a preparation process for xylitol fermented yogurt powder in order to improve the preparation efficiency of xylitol fermented yogurt powder, effectively reduce waste, and enhance sterilization effect.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a preparation process for xylitol fermented yogurt powder, wherein the xylitol fermented yogurt powder is prepared from the following raw materials in parts by weight: 6-8 parts whole milk powder, 1-2 parts whey protein powder, 1-2 parts xylitol, 1-2 parts skim milk powder, and 1-2 parts starter culture, wherein the starter culture is composed of Lactobacillus delbrueckii, Streptococcus thermophilus, Lactobacillus acidophilus, Bifidobacterium, Lactobacillus plantarum, and Lactobacillus rhamnosus in a mass ratio of 1:1:1:1:1:1:1. Includes the following steps: Step 1: Ingredients: Mix the proportions of whole milk powder, whey protein powder, xylitol and skim milk powder, add 3-4 times the weight of water, stir well and sterilize, then add the starter culture, mix well and store for later use. Step 2: Fermentation and homogenization: Ferment and homogenize the mixture prepared in the above steps for later use; Step 3: Concentration: Concentrate the mixture obtained in Step 2 to 15-20°Bé; Step 4: The mixture prepared in Step 3 is spray-dried and then cooled to room temperature in a fluidized bed. The water content in the material is 2.0-3.5%. The mixture is then mixed evenly in a spiral mixer to obtain the xylitol fermented yogurt powder. As a further embodiment of the present invention: Steps one, two, and three are carried out in a homogenizing and sterilizing device, which includes a homogenizer shell for placing the raw material mixture, a sealing top plate at the top of the homogenizer shell, a discharge pipe at the bottom of the homogenizer shell, a plurality of columnar lamp covers circumferentially installed at the bottom of the sealing top plate, and a homogenizing mechanism vertically arranged on the sealing top plate for homogenizing and stirring the mixture; a hollow jacket is provided in the inner wall of the homogenizer shell, and an electric heating wire is provided in the hollow jacket; The homogenizing mechanism includes: a homogenizing component and a wall scraping component; A homogenizing component, vertically mounted on a sealed top plate, is used for homogenizing the mixture. The wall scraping assembly connected to the bottom of the homogenizing component is used to scrape the inner wall of the homogenizer housing and the outer wall of the columnar lampshade, respectively. The outer walls of the homogenizer housing and the sealing top plate are symmetrically provided with docking mechanisms, which are used for positioning and docking between the homogenizer housing and the sealing top plate.

[0007] As a further embodiment of the present invention: the homogenizing component includes: A motor is installed at the top of a sealed top plate. The output end of the motor is fixedly connected to a rotating shaft. The bottom end of the rotating shaft is fixedly connected to a transmission impeller. The outer wall of the transmission impeller has multiple blades equidistantly formed around its circumference. A rotating ring is provided on the outer side of the transmission impeller and fixedly connected to the blades. A fixing cover is fitted onto the outer wall of the rotating ring. The top end of the fixing cover is fixedly connected to a fixing shaft that is fixedly connected to the sealed top plate. The bottom end of the transmission impeller is fixedly connected to a reciprocating screw located below the fixing cover via a connecting shaft. The bottom end of the reciprocating screw is fixedly connected to a transmission plate.

[0008] As a further embodiment of the present invention: the wall scraping assembly includes: Multiple scraper plates are circumferentially formed on the outer wall of the transmission plate. The outer wall of the scraper plate is arc-shaped and fits against the inner wall of the homogenizer housing. Multiple scraper plates are in contact with the inner wall of the homogenizer housing. A lifting push plate is sleeved on the outer wall of the reciprocating lead screw. Multiple lifting brackets are circumferentially formed on the outer wall of the lifting push plate. A support ring is integrally formed at the end of the lifting bracket away from the lifting push plate. A scraper ring that is sleeved on the outer wall of the columnar lampshade is sleeved inside the support ring.

[0009] As a further embodiment of the present invention: the docking mechanism includes: Two connecting blocks are symmetrically formed on the outer wall of the sealed top plate. The bottom ends of the two connecting blocks are fixedly connected to a lifting slide plate. The outer wall of the lifting slide plate is fitted with a positioning plate integrally formed with the housing of the homogenizer. The positioning plate is used to limit the lifting of the lifting slide plate.

[0010] As a further embodiment of the present invention: a sealing gasket is fixedly connected to the bottom end of the sealing top plate, which contacts the top end of the homogenizer housing; a discharge device for the homogenized mixture is fixedly connected to the bottom end of the homogenizer housing; an electric valve is installed at the bottom end of the inner wall of the homogenizer housing; the electric valve is electrically connected to an external controller via a wire; and a feed pipe for conveying the mixture is installed on the outer wall of the homogenizer housing.

[0011] As a further embodiment of the present invention: an ultraviolet disinfection lamp is installed inside the cylindrical lampshade, the ultraviolet disinfection lamp is electrically connected to an external controller through a wire, the outer wall of the cylindrical lampshade is formed with an external thread, and the inner wall of the scraping ring is provided with an internal thread that matches the thread of the outer wall of the cylindrical lampshade.

[0012] As a further embodiment of the present invention: the rotating ring and the fixed cover are both provided with multiple holes and slots in the circumference, and the inner wall of the lifting push plate is provided with an internal thread that matches the outer wall thread of the reciprocating lead screw.

[0013] As a further embodiment of the present invention: the outer wall of the scraping ring is formed with a limiting ring, the support ring is provided with a limiting groove for the limiting ring and the scraping ring to rotate, the top outer wall of the scraping ring is shaped like a frustum, and the upper end of the outer wall of the columnar lampshade is formed with a limiting baffle to block the scraping ring.

[0014] Compared with the prior art, the beneficial effects of the present invention are: By setting up a homogenization mechanism and a docking mechanism, the sealing top plate can be precisely sealed and docked with the homogenizer shell. Then, the motor is started, driving the rotating shaft. During this process, the rotating ring, fixed cover, reciprocating screw, transmission impeller, lifting bracket, limit ring, support ring, scraper ring, lifting push plate, transmission plate, and scraper plate work together to prevent the mixture from adhering to the inner wall of the homogenizer shell and the outer wall of the columnar lamp cover. Ultraviolet disinfection lamps thoroughly sterilize the substrate and the equipment cavity, while electric heating wires sterilize the initially produced yogurt. This makes the sterilization process more targeted and thorough, ensuring that the probiotics are not harmed. The prepared material is then discharged through a discharge pipe. The emptied equipment cavity can also be thoroughly sterilized with ultraviolet light for use in the next production run, effectively improving the efficiency of xylitol-fermented yogurt powder preparation and reducing waste caused by mixture residue. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic cross-sectional view of the homogenizer casing of the present invention; Figure 3 This is a schematic diagram of the homogenization mechanism structure of the present invention; Figure 4 This is a schematic diagram of the connection structure between the homogenizing component and the wall scraping component of the present invention; Figure 5 This is a schematic diagram of the connection structure between the wall scraping component and the columnar lampshade of the present invention; Figure 6 For the present invention Figure 4 A magnified schematic diagram of the structure at point A in the diagram; Figure 7 For the present invention Figure 5 A magnified schematic diagram of the structure at point B in the diagram.

[0016] In the diagram: 1. Homogenizer casing; 2. Homogenization mechanism; 201. Rotating shaft; 202. Fixed shaft; 203. Rotating ring; 204. Fixed cover; 205. Reciprocating screw; 206. Transmission impeller; 207. Lifting bracket; 208. Limiting ring; 209. Support ring; 2010. Scraping ring; 2011. Lifting push plate; 2012. Motor; 2013. Transmission plate; 2014. Scraping plate; 3. Docking mechanism; 301. Connecting block; 302. Positioning plate; 303. Lifting slide plate; 4. Sealing top plate; 5. Columnar lampshade; 6. Discharge pipe. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0019] Please see Figures 1 to 7 In this embodiment of the invention, a preparation process for xylitol fermented yogurt powder is provided. The xylitol fermented yogurt powder is made from the following raw materials in parts by weight: 6-8 parts whole milk powder, 1-2 parts whey protein powder, 1-2 parts xylitol, 1-2 parts skim milk powder, and 1-2 parts starter culture. The starter culture is composed of Lactobacillus delbrueckii, Streptococcus thermophilus, Lactobacillus acidophilus, Bifidobacterium, Lactobacillus plantarum, and Lactobacillus rhamnosus in a mass ratio of 1:1:1:1:1:1:1.

[0020] The specific implementation method is as follows:

[0021] The preparation process of xylitol fermented yogurt powder includes the following steps: Step 1: Ingredients: Mix the proportions of whole milk powder, whey protein powder, xylitol and skim milk powder, add 3-4 times the weight of water, stir well and sterilize, then add the starter culture, mix well and store for later use. Step 2: Fermentation and homogenization: Ferment and homogenize the mixture prepared in the above steps for later use; Step 3: Concentration: Concentrate the mixture obtained in Step 2 to 15-20°Bé; Step 4: Spray dry the mixture prepared in Step 3, then cool it to room temperature in a fluidized bed. The water content in the material is 2.0-3.5%. Mix it evenly in a spiral mixer to obtain the xylitol fermented yogurt powder.

[0022] In a preferred embodiment of the present invention, the equipment used in steps two and three includes a homogenizer housing 1 for placing the raw material mixture, a sealing top plate 4 at the top of the homogenizer housing 1, a discharge pipe 6 at the bottom of the homogenizer housing 1, a plurality of columnar lamp covers 5 circumferentially installed at the bottom of the sealing top plate 4, a sealing gasket in contact with the top of the homogenizer housing 1 fixedly connected to the bottom of the sealing top plate 4, a discharge device for discharging the homogenized mixture fixedly connected to the bottom of the homogenizer housing 1, an electric valve installed at the bottom of the inner wall of the homogenizer housing 1, the electric valve being electrically connected to an external controller via a wire, a feed pipe for conveying the mixture installed on the outer wall of the homogenizer housing 1, an ultraviolet disinfection lamp installed inside the columnar lamp covers 5, the ultraviolet disinfection lamp being electrically connected to an external controller via a wire, a homogenizing mechanism 2 vertically arranged on the sealing top plate 4, the homogenizing mechanism 2 being used for homogenizing and stirring the mixture; a hollow jacket is provided in the inner wall of the homogenizer housing 1, and an electric heating wire is provided in the hollow jacket.

[0023] The homogenizing mechanism 2 includes: a homogenizing component and a wall scraping component; the homogenizing component is vertically arranged on the sealed top plate 4 and is used to homogenize the mixture; the wall scraping component is connected to the bottom of the homogenizing component and is used to scrape the inner wall of the homogenizer housing 1 and the outer wall of the columnar lamp cover 5 respectively; the outer walls of the homogenizer housing 1 and the sealed top plate 4 are symmetrically provided with docking mechanisms 3, which are used for positioning and docking of the homogenizer housing 1 and the sealed top plate 4.

[0024] The docking mechanism 3 includes two connecting blocks 301 symmetrically formed on the outer wall of the sealed top plate 4. The bottom ends of the two connecting blocks 301 are fixedly connected to a lifting slide plate 303. The outer wall of the lifting slide plate 303 is fitted with a positioning plate 302 integrally formed with the homogenizer shell 1. The positioning plate 302 is used to limit the lifting of the lifting slide plate 303.

[0025] In this embodiment: When using this device, the sealing top plate 4 is hoisted to the top of the homogenizer housing 1 by a lifting device, and then the sealing top plate 4 is lowered. During this process, the lifting slide plate 303 is inserted into the interior of the positioning plate 302 by the connecting block 301 driven by the sealing top plate 4. At the same time, the sealing gasket is deformed under the pressure of the homogenizer housing 1 and the sealing top plate 4, so that the homogenizer housing 1 and the sealing top plate 4 can be accurately sealed and connected.

[0026] The mixture is then conveyed through the feed pipe into the inner cavity of the homogenizer housing 1 until the mixture covers the upper surface of the fixed cover 204. Then the feeding is stopped and the ultraviolet disinfection lamp is activated by the controller to disinfect the raw materials (referred to as substrates) except for the fermentation agent. Through the cooperation of the homogenizing component and the wall scraping component, the homogenization effect of the mixture can be achieved, and the mixture during the homogenization process can be prevented from adhering to the outer walls of the homogenizer housing 1 and the columnar lamp cover 5 respectively.

[0027] Once the mixture is homogenized, the electric valve is opened by the controller, and the homogenized mixture inside the homogenizer housing 1 is discharged out through the discharge pipe 6. During this process, the cooperation between the homogenizing component and the wall scraping component can effectively prevent the mixture residue from appearing on the outer wall of the homogenizer housing 1 and the columnar lamp cover 5, thereby effectively preventing a large amount of mixture residue from remaining inside the homogenizer housing 1 after homogenization, so as to reduce the waste of the mixture.

[0028] The homogenizing component includes: a motor 2012 mounted on the top of the sealing top plate 4; a rotating shaft 201 fixedly connected to the output end of the motor 2012; a transmission impeller 206 fixedly connected to the bottom end of the rotating shaft 201; multiple blades equidistantly formed on the outer wall of the transmission impeller 206; a rotating ring 203 fixedly connected to the blades on the outer side of the transmission impeller 206; a fixed cover 204 sleeved on the outer wall of the rotating ring 203; a fixed shaft 202 fixedly connected to the sealing top plate 4 on the top of the fixed cover 204; a reciprocating screw 205 located below the fixed cover 204 fixedly connected to the bottom end of the transmission impeller 206 via a connecting shaft; a transmission plate 2013 fixedly connected to the bottom end of the reciprocating screw 205; multiple holes and slots circumferentially opened on the rotating ring 203 and the fixed cover 204; and an internal thread on the inner wall of the lifting push plate 2011 that matches the thread on the outer wall of the reciprocating screw 205.

[0029] The wall scraping assembly includes: multiple wall scraping plates 2014 circumferentially formed on the outer wall of the transmission plate 2013, the outer wall of the wall scraping plates 2014 being arc-shaped, the outer wall of the wall scraping plates 2014 being in contact with the inner wall of the homogenizer housing 1, the multiple wall scraping plates 2014 being in contact with the inner wall of the homogenizer housing 1, a lifting push plate 2011 being sleeved on the outer wall of the reciprocating screw 205, multiple lifting brackets 207 being circumferentially formed on the outer wall of the lifting push plate 2011, a support ring 209 being integrally formed at the end of the lifting bracket 207 away from the lifting push plate 2011, a wall scraping ring 2010 being sleeved inside the support ring 209 and sleeved on the outer wall of the columnar lampshade 5, the outer wall of the columnar lampshade 5 being formed with external threads, and the inner wall of the wall scraping ring 2010 being provided with internal threads that match the threads of the outer wall of the columnar lampshade 5.

[0030] In this embodiment: the starting motor 2012 drives the rotating shaft 201 to rotate. At this time, the transmission impeller 206, driven by the rotating shaft 201, drives the rotating ring 203 to rotate through the blades. The high-speed and stable rotation of the rotating ring 203 and the transmission impeller 206 generates a high-frequency, strong circumferential tangential velocity, angular velocity and other comprehensive kinetic energy efficiency. The reasonable narrow gap between the rotating ring 203 and the fixed cover 204 generates a strong, reciprocating hydraulic shearing, friction, centrifugal extrusion and liquid flow collision and other comprehensive effects. The material circulates in the fixed cover 204 and repeats the above working process, which can achieve the homogenization effect of the mixture.

[0031] Simultaneously, the reciprocating screw 205, driven by the transmission impeller 206, drives the transmission plate 2013 to rotate. At this time, multiple scraper plates 2014, driven by the transmission plate 2013, scrape the inner wall of the homogenizer housing 1, which can prevent some materials in the mixture from depositing and adhering to the inner wall of the homogenizer housing 1. During this process, the lifting push plate 2011, driven by the thread on the outer wall of the reciprocating screw 205, drives the support ring 209 to move through the lifting bracket 207. At this time, the support ring 209, under the limit of the scraper ring 2010 by the limiting ring 208, can make the lifting bracket 207 perform linear reciprocating lifting and lowering. At the same time, the scraper ring 2010, guided by the thread on the outer wall of the columnar lamp cover 5, rotates along the inner wall of the support ring 209 through the limiting ring 208, which can make the ultraviolet disinfection lamp fully sterilize the substrate mixture except for the fermentation agent.

[0032] After the mixture has fermented and homogenized, the electric valve is opened by the controller. At the same time, the homogenized mixture inside the homogenizer housing 1 is discharged out through the discharge pipe 6. During this process, the scraper 2014 scrapes against the inner wall of the homogenizer housing 1, effectively preventing the residue of the mixture from remaining on the inner wall of the homogenizer housing 1. Meanwhile, the frustum-shaped outer wall of the scraper ring 2010 scrapes the mixture remaining on the outer wall of the columnar lampshade 5. The limiting baffle blocks the scraper ring 2010, ensuring that the mixture on the outer wall of the columnar lampshade 5 is completely scraped off. This effectively prevents a large amount of mixture from remaining inside the homogenizer housing 1 after homogenization, thus reducing waste of the mixture.

[0033] The outer wall of the scraping ring 2010 is formed with a limiting ring 208. The support ring 209 is provided with a limiting groove for the limiting ring 208 and the scraping ring 2010 to rotate. The top outer wall of the scraping ring 2010 is shaped like a frustum. The upper end of the outer wall of the columnar lampshade 5 is formed with a limiting baffle to block the scraping ring 2010.

[0034] In this embodiment: the cooperation between the limiting baffle and the frustum-shaped outer wall of the scraping ring 2010 allows the scraping ring 2010 to clean the outer wall of the columnar lamp cover 5, enabling the ultraviolet disinfection lamp to efficiently sterilize the substrate and the inner cavity of the equipment. During the process of discharging the mixture from the homogenizer housing 1, the mixture is prevented from remaining on the outer wall of the columnar lamp cover 5, which would otherwise adversely affect the sterilization effect of the ultraviolet disinfection lamp.

[0035] The working principle of this invention is as follows: It should be noted that when the sealing top plate 4 is connected to the homogenizer housing 1, it needs to be suspended and moved to the top of the homogenizer housing 1 by a hoist. When using this device, the sealing top plate 4 is hoisted to the top of the homogenizer housing 1 by a hoist, and then the sealing top plate 4 is lowered. During this process, the lifting slide plate 303 is inserted into the interior of the positioning plate 302 by the connecting block 301 driven by the sealing top plate 4. At the same time, the sealing gasket is deformed under the pressure of the homogenizer housing 1 and the sealing top plate 4, so that the homogenizer housing 1 and the sealing top plate 4 can be accurately sealed and connected.

[0036] The mixture, excluding the fermentation agent, is then fed into the inner cavity of the homogenizer housing 1 through the feed pipe until it covers the upper surface of the fixed cover 204. Feeding is then stopped, and the ultraviolet sterilization lamp is activated via the controller to sterilize the substrate. After the substrate has been sterilized by ultraviolet light, the fermentation agent is added.

[0037] The starting motor 2012 drives the rotating shaft 201 to rotate. At this time, the transmission impeller 206, driven by the rotating shaft 201, drives the rotating ring 203 to rotate via its blades. The high-speed, stable rotation of the rotating ring 203 and the transmission impeller 206 generates high-frequency, intense circumferential tangential velocity and angular velocity, resulting in a comprehensive kinetic energy effect. Meanwhile, the reasonably narrow gap between the rotating ring 203 and the fixed cover 204 creates a strong, reciprocating combined effect of hydraulic shearing, friction, centrifugal extrusion, and liquid flow collision. The material circulates repeatedly within the fixed cover 204, achieving a homogenization effect on the mixture. After homogenization, the material begins fermentation. The electric heating wire within the hollow interlayer of the fermenter casing 1 is activated, providing a constant temperature fermentation environment of 40-42℃ for 2.5 ± 0.5 hours until fermentation is complete.

[0038] Driven by the transmission impeller 206, the reciprocating screw 205 drives the transmission plate 2013 to rotate. At this time, multiple scraper plates 2014 scrape the inner wall of the homogenizer housing 1 under the drive of the transmission plate 2013, which can prevent some materials in the mixture from depositing and adhering to the inner wall of the homogenizer housing 1. During this process, the lifting push plate 2011, driven by the thread on the outer wall of the reciprocating screw 205, drives the support ring 209 to move through the lifting bracket 207. At this time, the support ring 209, under the limit of the scraper ring 2010 by the limiting ring 208, can make the lifting bracket 207 perform linear reciprocating lifting and lowering. At the same time, the scraper ring 2010, guided by the thread on the outer wall of the columnar lampshade 5, rotates along the inner wall of the support ring 209 through the limiting ring 208.

[0039] Once the mixture is homogenized, the electric valve is opened by the controller, and the homogenized mixture inside the homogenizer housing 1 is discharged out through the discharge pipe 6. During this process, the scraper 2014 scrapes against the inner wall of the homogenizer housing 1, effectively preventing the residue of the mixture from appearing on the inner wall of the homogenizer housing 1. At the same time, the frustum-shaped outer wall of the scraper ring 2010 scrapes the mixture remaining on the outer wall of the columnar lampshade 5. The limiting baffle blocks the scraper ring 2010, ensuring that the mixture on the outer wall of the columnar lampshade 5 is completely scraped off. This effectively improves the preparation efficiency of xylitol fermented yogurt powder and reduces waste caused by the residue of the mixture.

[0040] After one round of production and material discharge is completed, the inner cavity of the equipment is rinsed clean, and the ultraviolet lamp can be turned on again to thoroughly sterilize the inner cavity wall of the equipment in preparation for the next use.

[0041] The above description is merely 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 preparation process for xylitol-fermented yogurt powder, characterized in that, Xylitol fermented yogurt powder is made from the following ingredients in parts by weight: 6-8 parts whole milk powder, 1-2 parts whey protein powder, 1-2 parts xylitol, 1-2 parts skim milk powder, and 1-2 parts starter culture. The starter culture is composed of Lactobacillus delbrueckii, Streptococcus thermophilus, Lactobacillus acidophilus, Bifidobacterium, Lactobacillus plantarum, and Lactobacillus rhamnosus in a mass ratio of 1:1:1:1:1:

1. Includes the following steps: Step 1: Ingredients: Mix the whole milk powder, whey protein powder, xylitol and skim milk powder in the specified proportions, add 3-4 times the weight of water and stir well. Sterilize the mixture, then add the starter culture and mix well. Store for later use. Step 2: Fermentation and homogenization: Ferment and homogenize the mixture prepared in the above steps for later use; Step 3: Concentration: Concentrate the mixture obtained in Step 2 to 15-20°Bé; Step 4: After spray drying the mixture prepared in Step 3, cool it to room temperature in a fluidized bed. The water content in the material is 2.0-3.5%. Mix it evenly in a spiral mixer to obtain the xylitol fermented yogurt powder. Steps one, two, and three are carried out in a homogenizing and sterilizing equipment. The homogenizing and sterilizing equipment includes a homogenizer shell (1) for placing the raw material mixture. A sealing top plate (4) is provided at the top of the homogenizer shell (1). A discharge pipe (6) is installed at the bottom of the homogenizer shell (1). Multiple columnar lamp covers (5) are installed circumferentially at the bottom of the sealing top plate (4). A homogenizing mechanism (2) is vertically arranged on the sealing top plate (4). The homogenizing mechanism (2) is used to homogenize and stir the mixture. A hollow jacket is provided in the inner wall of the homogenizer shell (1). An electric heating wire is provided in the hollow jacket. The homogenizing mechanism (2) includes: a homogenizing component and a wall scraping component; A homogenizing component is vertically mounted on the sealed top plate (4) for homogenizing the mixture; The wall scraping assembly connected to the bottom of the homogenizing assembly is used to scrape the inner wall of the homogenizer housing (1) and the outer wall of the columnar lamp cover (5), respectively. The outer walls of the homogenizer housing (1) and the sealing top plate (4) are symmetrically provided with docking mechanisms (3), which are used for positioning docking between the homogenizer housing (1) and the sealing top plate (4). The homogenizing component includes: A motor (2012) is installed at the top of the sealing top plate (4). The output end of the motor (2012) is fixedly connected to a rotating shaft (201). The bottom end of the rotating shaft (201) is fixedly connected to a transmission impeller (206). The outer wall of the transmission impeller (206) is circumferentially formed with multiple blades. A rotating ring (203) is provided on the outer side of the transmission impeller (206) and is fixedly connected to the blades. A fixed cover (204) is sleeved on the outer wall of the rotating ring (203). The top end of the fixed cover (204) is circumferentially fixedly connected to a fixed shaft (202) fixedly connected to the sealing top plate (4). The bottom end of the transmission impeller (206) is fixedly connected to a reciprocating screw (205) located below the fixed cover (204) through a connecting shaft. The bottom end of the reciprocating screw (205) is fixedly connected to a transmission plate (2013). The wall scraping assembly includes: Multiple scraper plates (2014) are circumferentially formed on the outer wall of the transmission plate (2013). The outer wall of the scraper plate (2014) is arc-shaped. The outer wall of the scraper plate (2014) is in contact with the inner wall of the homogenizer housing (1). Multiple scraper plates (2014) are in contact with the inner wall of the homogenizer housing (1). A lifting push plate (2011) is sleeved on the outer wall of the reciprocating screw (205). Multiple lifting brackets (207) are circumferentially formed on the outer wall of the lifting push plate (2011). A support ring (209) is integrally formed at the end of the lifting bracket (207) away from the lifting push plate (2011). A scraper ring (2010) sleeved on the outer wall of the columnar lampshade (5) is sleeved inside the support ring (209).

2. The preparation process of xylitol fermented yogurt powder according to claim 1, characterized in that, The docking mechanism (3) includes: Two connecting blocks (301) are symmetrically formed on the outer wall of the sealed top plate (4). The bottom ends of the two connecting blocks (301) are fixedly connected to the lifting slide plate (303). The outer wall of the lifting slide plate (303) is fitted with a positioning plate (302) integrally formed with the homogenizer shell (1). The positioning plate (302) is used to limit the lifting of the lifting slide plate (303).

3. The preparation process of xylitol fermented yogurt powder according to claim 1, characterized in that, The bottom end of the sealing top plate (4) is fixedly connected to a sealing gasket that contacts the top end of the homogenizer housing (1). The bottom end of the homogenizer housing (1) is fixedly connected to a discharge device for the homogenized mixture. An electric valve is installed at the bottom end of the inner wall of the homogenizer housing (1). The electric valve is electrically connected to an external controller via a wire. A feed pipe for conveying the mixture is installed on the outer wall of the homogenizer housing (1).

4. The preparation process of xylitol fermented yogurt powder according to claim 1, characterized in that, The cylindrical lampshade (5) is equipped with an ultraviolet disinfection lamp. The ultraviolet disinfection lamp is electrically connected to an external controller via a wire. The outer wall of the cylindrical lampshade (5) is formed with an external thread. The inner wall of the scraper ring (2010) is provided with an internal thread that matches the thread on the outer wall of the cylindrical lampshade (5).

5. The preparation process of xylitol fermented yogurt powder according to claim 1, characterized in that, The rotating ring (203) and the fixed cover (204) are provided with multiple holes and slots in the circumference, and the inner wall of the lifting push plate (2011) is provided with an internal thread that matches the outer thread of the reciprocating screw (205).

6. The preparation process of xylitol fermented yogurt powder according to claim 1, characterized in that, The outer wall of the scraping ring (2010) is formed with a limiting ring (208), and the support ring (209) is provided with a limiting groove for the limiting ring (208) and the scraping ring (2010) to rotate. The top outer wall of the scraping ring (2010) is shaped like a frustum, and the upper end of the outer wall of the columnar lampshade (5) is formed with a limiting baffle to block the scraping ring (2010).

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