Post-sterilization equipment and method for fermented milk production

Abstract

The invention discloses post-sterilization equipment for fermented milk production and a method thereof, belongs to the technical field of fermented milk processing, and provides the following scheme that the post-sterilization equipment comprises a sterilization device, a detection assembly and a heat exchange mechanism are arranged in the sterilization device, and the heat exchange mechanism comprises a maintaining assembly and an output assembly; four heat exchange devices are arranged in the maintaining assembly. The multiple multi-way valves are connected through the connectors, then the multi-way valves can be connected with multiple sets of heat exchange equipment, at the moment, by switching opening and closing of the multi-way valves, sterilization work can be conducted through operation of a single set of heat exchange equipment, fermented milk can be shunted to the multiple sets of heat exchange equipment for sterilization, and then the heat exchange area can be increased, so that the sterilization efficiency is improved. And secondly, the pipelines are opened by controlling the lower three-way valves, so that the four groups of heat exchange equipment can be connected in series, and the fermented milk is sterilized by passing through the four groups of heat exchange equipment in sequence, so that the heat exchange path and time of the fermented milk are prolonged, thorough sterilization is ensured, and the texture of the fermented milk is improved.

Description

Technical Field

[0001] This invention relates to the field of fermented milk processing technology, and in particular to a post-sterilization device and method for fermented milk production. Background Technology

[0002] In the production of fermented milk, traditional sterilization processes mostly employ pre-fermentation sterilization or post-fermentation pasteurization, but these have significant drawbacks: while the former can retain some live bacteria, it cannot effectively inhibit the post-acidification reaction under the refrigerated environment after fermentation, resulting in a shortened shelf life and deterioration of sensory quality; the latter leads to a lack of live bacteria, affecting the product's probiotic function. To solve these problems, the industry has gradually adopted post-fermentation low-temperature sterilization processes, making the corresponding post-sterilization equipment crucial.

[0003] However, existing post-sterilization equipment for fermented milk production still has some problems in practical applications: On the one hand, the heat exchange modules are mostly fixed single-unit designs. If the processing efficiency needs to be improved, the entire equipment needs to be upgraded; if the processing effect needs to be improved, additional processing steps are required. Moreover, maintenance and cleaning must be carried out, leading to production interruption and seriously affecting production efficiency. On the other hand, the core plate heat exchanger clamping part of the equipment relies on bolts for single-time fixing. During long-term operation, equipment vibration can easily cause the bolts to loosen, which not only affects the sealing performance of the heat exchanger but may also cause material leakage. Furthermore, after maintenance, the equipment must be shut down and disassembled to check for internal leaks in the heat exchanger, which is complicated and further prolongs the downtime, failing to meet the needs of efficient and stable fermented milk production. (The most significant problem is that live bacteria cannot be retained after sterilization. This patent solves this problem by retaining live bacteria after sterilization. After being placed at room temperature for 15 days, the number of live bacteria is greater than 10.) 6 (No post-acidification reaction occurs) To address the above problems, this invention proposes a post-sterilization device and method for fermented milk production. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing post-sterilization equipment for fermented milk production, which mostly uses fixed single-unit heat exchange modules that are difficult to combine and use. Furthermore, maintenance and cleaning require shutdown, which seriously affects production efficiency. During long-term operation, equipment vibration can easily cause bolts to loosen, affecting the sealing performance of the heat exchanger and potentially causing material leakage. Moreover, maintenance requires shutdown and disassembly to check for leaks inside the heat exchanger, which is complicated and further prolongs downtime. Therefore, this invention proposes a post-sterilization equipment and method for fermented milk production.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A post-sterilization device for fermented milk production includes a sterilization unit, wherein the sterilization unit is provided with a detection component and a heat exchange mechanism; The heat exchange mechanism includes a holding component and an output component. The holding component has four heat exchange devices inside. The inner cavity of the output component is connected to four second solenoid valves. The four second solenoid valves are respectively connected to the four water outlets of the heat exchange devices. The manifold of the output component is connected to four lower three-way valves. The four lower three-way valves are respectively connected to the fermented milk output ports of the four heat exchange devices. The output component is equipped with a temperature control component, and a drive component is located above the temperature control component. The four first solenoid valves of the temperature control component are respectively connected to the water inlets of the four heat exchange devices. The fermentation milk inlets of the four heat exchange devices are respectively connected to four multi-way valves. The four multi-way valves pass through the rotating cylinder and are connected to the same connector. The multi-way valves are connected to the lower three-way valve through interlaced pipes, thereby connecting the four heat exchange devices in series.

[0006] Preferably, the retaining assembly includes two retaining rings and two detachable sections. The two retaining rings are installed in the sterilization device through multiple assembly plates, and each retaining ring has a locking slot at both ends.

[0007] Preferably, both ends of the detachable section are fixed to two bayonet slots by bolts, and a handle is fixedly connected between the two detachable sections.

[0008] Preferably, the detection component includes a fan, which is installed in the sterilization device. The fan is connected to a connector via a hose, and a pressure sensor is provided on the connector.

[0009] Preferably, a connector is installed on the docking head, the connector is fixed to the electric push rod, and the electric push rod is fixedly connected to the sterilization device through a fixing plate.

[0010] Preferably, the drive assembly includes a mounting base and a rotating drum. A motor is mounted on the mounting base, and a first gear is fixedly connected to the output shaft of the motor. A second gear meshes with one side of the first gear. The second gear is mounted on the rotating drum. A connector is provided in the rotating drum. The connector is rotatably mounted on the milk inlet pipe through a bearing, and the connector is kept in communication with the milk inlet pipe.

[0011] Preferably, the temperature control component includes a temperature control conveying device, the mounting base is installed on the temperature control conveying device, the output port of the temperature control conveying device passes through the mounting base and is connected to a multi-port pipe, the multi-port pipe passes through a rotating drum and is connected to four first solenoid valves, the multi-port pipe is arranged in the rotating drum, and one end of the multi-port pipe is rotatably mounted on the output port of the temperature control conveying device through a bearing.

[0012] Preferably, the output component includes a manifold and two rotating rings. The manifold is fixedly connected to the sterilization device and communicates with the milk outlet pipe. An inner cavity is provided in the manifold and communicates with the temperature-controlled conveying device. Both rotating rings are rotatably mounted in the manifold and inner cavity respectively via bearings, and four lower three-way valves and four second solenoid valves are respectively mounted on the two rotating rings.

[0013] Preferably, four limiting wheels are provided on one side of the heat exchange device, two of which travel on the retaining ring and the detachable section, and four auxiliary wheels are provided below the heat exchange device, which travel on the bottom wall of the sterilization device.

[0014] A method for using a post-sterilization device for fermented milk production includes the following steps: S1. When it is necessary to sterilize fermented milk through a single heat exchanger, the temperature control component delivers hot water into the separate heat exchanger for circulating heat exchange to sterilize the fermented milk. The sterilized fermented milk is discharged through the manifold and the milk outlet pipe. S2. When four sets of heat exchange equipment need to be sterilized simultaneously, the fermented milk is diverted into the multi-way valve through the milk inlet pipe and connector, so that the four heat exchange equipment can be sterilized simultaneously. After sterilization, it is discharged through the milk outlet pipe. When four sets of heat exchange equipment need to be connected in series, the other three multi-way valves and three lower three-way valves are controlled to switch the opening of the pipeline, so that the fermented milk passes through the four heat exchange equipment in sequence for sterilization. S3. When maintenance is required, the central drive unit drives the heat exchange equipment to rotate. When the heat exchange equipment is in the detachable section position, the detachable section is removed before the heat exchange equipment maintenance work is carried out. S4. When it is necessary to test the sealing performance of the heat exchange equipment, the electric push rod controls the connector to connect with the multi-way valve, and then the fan inputs a certain amount of gas into the fermentation milk channel of the heat exchange equipment. The pressure sensor detects the internal pressure change of the heat exchange equipment, thereby realizing the sealing test of the heat exchange equipment.

[0015] Compared with the prior art, the present invention provides a post-sterilization device and method for fermented milk production, which has the following beneficial effects: 1. The sterilization equipment and method for fermented milk production involves connecting multiple multi-way valves via connectors, which in turn connect multiple sets of heat exchange equipment. By switching the opening and closing of the multi-way valves, not only can a single set of heat exchange equipment be operated for sterilization, but the fermented milk can also be diverted to multiple sets of heat exchange equipment for sterilization. This increases the heat exchange area and improves the overall processing rate. Furthermore, by controlling the lower three-way valve to open the pipeline, four sets of heat exchange equipment can be connected in series, allowing the fermented milk to pass through the four sets of heat exchange equipment in sequence for sterilization. This extends the heat exchange path and time of the fermented milk, ensuring thorough sterilization and improving the texture of the fermented milk.

[0016] 2. The sterilization equipment and method for fermented milk production can effectively counteract the vibration and impact during equipment operation by using a retaining component to limit the heat exchange equipment. This prevents the bolts fixing the heat exchange equipment from loosening due to long-term vibration. Secondly, the detection component can perform sealing tests on the heat exchange equipment. In case of abnormality, the heat exchange equipment can be moved to the detachable section through the central drive component and then removed. At this time, maintenance work can be carried out on a single heat exchange equipment. During maintenance, the other heat exchange equipment will continue to operate normally without stopping the machine. After maintenance, the detection component can be used to quickly determine whether there is a leak inside the heat exchange equipment, making the entire operation process simple and efficient.

[0017] 3. The sterilization equipment and method used in fermented milk production allows for flexible switching between multiple heat exchangers via a multi-way valve. This switching provides ample space for test specimens and operations for the maintenance of other heat exchangers. Furthermore, the central drive assembly facilitates the smooth transfer of heat exchangers to the maintenance area, enabling personnel to perform limit checks, bolt tightening, and leak detection without disrupting production. Additionally, the retaining assembly provides secondary limit control for the heat exchangers. This synergistic effect ensures not only continuous and efficient production but also stable and reliable equipment, further guaranteeing stable heat exchange efficiency and sterilization effectiveness. Attached Figure Description

[0018] Figure 1 This is a perspective view of a post-sterilization device for fermented milk production proposed in this invention; Figure 2 This is a partial perspective view of a post-sterilization device for fermented milk production proposed in this invention; Figure 3 This is a partial perspective view of the sterilization device of a post-sterilization equipment for fermented milk production proposed in this invention; Figure 4 This is a perspective view of the retaining component of a post-sterilization device for fermented milk production according to the present invention; Figure 5 This is a perspective view of the detection component of a post-sterilization device for fermented milk production proposed in this invention; Figure 6 This is a perspective view of the arrangement of four heat exchange devices in a post-sterilization device for fermented milk production proposed in this invention. Figure 7 This is a perspective view showing the connection between the output component and the temperature control component of a post-sterilization device for fermented milk production according to the present invention. Figure 8 This is a cross-sectional perspective view of the output component of a post-sterilization device for fermented milk production proposed in this invention; Figure 9This is a perspective view of the temperature control component of a post-sterilization equipment for fermented milk production according to the present invention. Figure 10 This is a perspective view of the pipes, multi-way valves, and bottom three-way valves of a post-sterilization equipment for fermented milk production according to the present invention. Figure 11 This is a perspective view of the heat exchange device of a post-sterilization equipment for fermented milk production proposed in this invention.

[0019] In the diagram: 100, Sterilization device; 101, Detection component; 1011, Fan; 1012, Pressure sensor; 1013, Connecting joint; 1014, Electric push rod; 1015, Fixing plate; 1016, Connecting component; 200, Heat exchange mechanism; 201, Holding component; 2011, Holding ring; 2012, Assembly plate; 2013, Handle; 2014, Detachable section; 2015, Bayonet; 202, Milk inlet pipe; 203, Heat exchange equipment; 204, Milk outlet pipe; 205, Output component; 206, 207, 208, 209, 200, 200, 201 ... 1. Manifold; 2052. Inner cavity; 2053. Rotary ring; 206. Central drive assembly; 2061. Rotary drum; 2062. Connector; 2063. Motor; 2064. First gear; 2065. Second gear; 2066. Mounting base; 207. Temperature control assembly; 2071. Temperature-controlled conveying equipment; 2072. Multi-port pipe; 2073. First solenoid valve; 208. Multi-port valve; 209. Pipeline; 210. Lower three-way valve; 211. Auxiliary wheel; 212. Limiting wheel; 213. Second solenoid valve. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this invention.

[0022] Example 1: Refer to Figures 1-3 and Figures 6-10 A sterilization device for fermented milk production includes a sterilization device 100, in which a detection component 101 and a heat exchange mechanism 200 are provided. The heat exchange mechanism 200 includes a holding component 201 and an output component 205. The output component 205 includes a manifold 2051 and two rotating rings 2053. The manifold 2051 is fixedly connected to the sterilization device 100 and is connected to the milk outlet pipe 204. The sterilized fermented milk can be collected through the manifold 2051 and discharged smoothly through the milk outlet pipe 204. An inner cavity 2052 is provided in the manifold 2051, which can isolate it from the manifold 2051, thus facilitating the storage of heat exchange water. The inner cavity 2052 is connected to the temperature control conveying device 2071. The two rotating rings 2053 are rotatably mounted in the manifold 2051 and the inner cavity 2053 respectively by bearings. In cavity 2052, the rotating ring 2053 can be kept in stable rotation by bearings, so that the drive assembly 206 can smoothly realize rotational movement. Four lower three-way valves 210 and four second solenoid valves 213 are respectively installed on two rotating rings 2053. The internal cavity 2052 of the output assembly 205 is connected to the four second solenoid valves 213. The four second solenoid valves 213 are respectively connected to the four outlets of the heat exchanger 203. The manifold 2051 of the output assembly 205 is connected to the four lower three-way valves 210. The four lower three-way valves 210 are respectively connected to the fermented milk output ports of the four heat exchangers 203. A temperature control component 207 is provided on the output component 205. The temperature control component 207 includes a temperature control conveying device 2071, which heats and conveys the hot water for heat exchange, facilitating heat exchange operations. A mounting base 2066 is installed on the temperature control conveying device 2071. The output port of the temperature control conveying device 2071 passes through the mounting base 2066 and connects to a multi-port pipe 2072. The multi-port pipe 2072 can achieve the purpose of diverting the hot water, thus facilitating the input of the hot water to multiple heat exchange devices 203, which in turn facilitates the simultaneous heat exchange and sterilization of the fermented milk by multiple heat exchange devices 203. The multi-port pipe 2072 passes through the rotating drum 2061 and connects to four first solenoid valves 2073. The multi-port pipe 2072 is located in the rotating drum 2061, and one end of the multi-port pipe 2072 is rotatably mounted on the output port of the temperature control conveying device 2071 via a bearing. The multi-port pipe 2072 can be connected to the temperature control device via the bearing. The output port of the conveying device 2071 not only ensures the connection with the temperature-controlled conveying device 2071, but also allows the multi-port pipe 2072 to rotate smoothly. A drive assembly 206 is provided above the temperature control component 207. The four first solenoid valves 2073 of the temperature control component 207 are respectively connected to the inlets of the four heat exchange devices 203. The fermented milk inlets of the four heat exchange devices 203 are respectively connected to the four multi-port valves 208. The four multi-port valves 208 pass through the rotating drum 2061 and are connected to the same connector 2062. The multi-port valves 208 are connected to the lower three-way valve 210 through the pipes 209 in an alternating manner, thereby connecting the four heat exchange devices 203 in series. By connecting the multi-port valves 208 and the lower three-way valve 210 through the alternating ends of the pipes 209, the four sets of heat exchange devices 203 can form a series path after the pipes 209 are opened, so that the fermented milk can pass through the four sets of heat exchange devices 203 in sequence for heat exchange and sterilization.

[0023] In this embodiment: multiple multi-way valves 208 are connected via connector 2062, which in turn can connect to multiple sets of heat exchange equipment 203. At this time, by closing the other three upper valves, the fermented milk enters a single set of heat exchange equipment 203. With the help of temperature control component 207, the single set of heat exchange equipment 203 can be operated for sterilization. When all the multi-way valves 208 are opened, the fermented milk can be diverted to multiple sets of heat exchange equipment 203 for sterilization. This increases the heat exchange area and improves the overall processing rate. Furthermore, by controlling three of the multi-way valves 208 and three lower three-way valves 210 to connect to the pipeline 209, the four sets of heat exchange equipment 203 can be connected in series, allowing the fermented milk to pass through the four sets of heat exchange equipment 203 in sequence for sterilization. This extends the heat exchange path and time of the fermented milk, ensuring thorough sterilization.

[0024] Example 2: Refer to Figures 4-5 , Figure 8 and Figure 11A post-sterilization device for fermented milk production includes a retaining assembly 201. The retaining assembly 201 comprises two retaining rings 2011 and two detachable sections 2014. The two retaining rings 2011 are installed in the sterilization device 100 via multiple mounting plates 2012. Each retaining ring 2011 has a locking slot 2015 at both ends. Each end of the detachable section 2014 is fixed to one of the two locking slots 2015 by bolts. The bolts connect the detachable section 2014 to the retaining rings 2011, thereby providing secondary positioning for the heat exchanger 203, ensuring the stability of the heat exchanger 203. Furthermore, removing the detachable section 2014 facilitates maintenance of the heat exchanger 203. A handle 2013 is fixedly connected between the detachable sections 2014, which allows relevant personnel to easily remove the detachable sections 2014. Four limiting wheels 212 are provided on one side of the heat exchange device 203. The limiting wheels 212 travel on the retaining ring 2011 and the detachable sections 2014, thereby limiting the movement of the heat exchange device 203 and reducing the movement resistance of the heat exchange device 203. Two limiting wheels 212 travel on the retaining ring 2011 and the detachable sections 2014. Four auxiliary wheels 211 are provided below the heat exchange device 203. The auxiliary wheels 211 can assist the heat exchange device 203 to move smoothly. The four auxiliary wheels 211 travel on the bottom wall of the sterilization device 100. The detection component 101 includes a fan 1011, which is installed in the sterilization device 100. The fan 1011 is connected to the connector 1013 via a hose. The connector 1013 is tightly pressed against the interface of the upper solenoid valve to maintain a seal. A pressure sensor 1012 is provided on the connector 1013. A connector 1016 is installed on the connector 1013. The connector 1016 is fixed to the electric push rod 1014. The electric push rod 1014 is fixedly connected to the sterilization device 100 via a fixing plate 1015. The drive assembly 206 includes a mounting base 2066 and a rotating drum 2061. A motor 2063 is mounted on the mounting base 2066, which can fix the motor 2063 to ensure that the motor 2063 stably drives the first gear 2064. The output shaft of the motor 2063 is fixedly connected to the first gear 2064. A second gear 2065 meshes on one side of the first gear 2064. The second gear 2065 is mounted on the rotating drum 2061. A connector 2062 is provided in the rotating drum 2061. The connector 2062 is rotatably mounted on the milk inlet pipe 202 through a bearing. The connector 2062 can rotate smoothly through the bearing, so that the rotating drum 2061 can maintain smooth rotation, and the connector 2062 is kept in communication with the milk inlet pipe 202.

[0025] In this embodiment: the retaining component 201 can provide secondary limiting for the heat exchanger 203, effectively offsetting vibration and impact during equipment operation and preventing the bolts fixing the heat exchanger 203 from loosening due to long-term vibration. Secondly, the electric push rod 1014 controls the docking of the connector 1013 with the multi-way valve 208. At this time, air is supplied to the heat exchanger 203 via the fan 1011. The pressure sensor 1012 can detect the pressure in the heat exchanger 203 to determine if there is a sealing leak. When an abnormality occurs, the motor 2063 drives the first gear 2064 and the second gear 2065 to rotate the drum 2061. This allows the heat exchanger 203 to be moved to the detachable section 2014 via the multi-way valve 208, and the detachable section 2014 can be removed. At this time, maintenance work can be performed on a single heat exchanger 203. During maintenance, the other heat exchangers 203 operate normally without the need to stop the operation. After maintenance, the detection component 101 can be used to quickly determine whether there is a leak inside the heat exchanger 203, making the entire operation process simple and efficient.

[0026] Example 3: Reference Figures 1-3 and Figures 6-10 A post-sterilization device for fermented milk production includes a heat exchange mechanism 200. The heat exchange mechanism 200 includes a holding component 201 and an output component 205. The holding component 201 is provided with four heat exchange devices 203. The inner cavity 2052 of the output component 205 is connected to four second solenoid valves 213. The four second solenoid valves 213 are respectively connected to four outlets of the heat exchange devices 203. The manifold 2051 of the output component 205 is connected to four lower three-way valves 210. The four lower three-way valves 210 are respectively connected to the fermented milk output ports of the four heat exchange devices 203. A temperature control component 207 is provided on the output component 205, and a drive component 206 is provided above the temperature control component 207. The four first solenoid valves 2073 of the temperature control component 207 are respectively connected to the inlet of the four heat exchange devices 203. The fermented milk inlet of the four heat exchange devices 203 is respectively connected to the four multi-way valves 208. The four multi-way valves 208 pass through the rotating drum 2061 and are connected to the same connector 2062. The multi-way valves 208 are connected to the lower three-way valve 210 through the pipes 209 in an alternating manner, thereby connecting the four heat exchange devices 203 in series.

[0027] In this embodiment, multiple heat exchange devices 203 can be flexibly switched using a multi-way valve 208. This switching provides ample space for test specimens and operations for the maintenance of the remaining heat exchange devices 203. In conjunction with the drive assembly 206, the heat exchange devices 203 can be smoothly transferred to the maintenance area. This allows relevant personnel to perform limit checks and bolt tightening on the heat exchange devices 203 without affecting production. They can also perform leak detection in conjunction with the detection assembly 101. Furthermore, the holding assembly 201 can provide secondary limit control for the heat exchange devices 203. The synergistic effect of these multiple functions not only ensures production continuity and efficiency but also guarantees equipment stability and reliability, further ensuring the stable heat exchange efficiency and sterilization effect of the heat exchange devices 203.

[0028] Example 4: Using L93 4 Orthogonal experiments were conducted to determine the optimal process conditions for post-sterilization fermented milk. The results of orthogonal experiments with different post-sterilization temperatures and times are shown in Table 1.

[0029] Table 1. Results of orthogonal experiments with different post-sterilization temperatures and times.

[0030] The orthogonal experimental range analysis of sensory evaluation, water holding capacity and lactic acid bacteria count for different post-sterilization temperatures and times was obtained using the DPS data processing system, as shown in Table 2.

[0031] As shown in Table 2 of the range analysis, temperature has a significant impact on the sensory evaluation range (R=5.6667), water-holding capacity range (R=0.0177), and lactic acid bacteria count range (R=486.5333) of post-sterilized fermented milk. Time has a smaller impact on these ranges. Since the viable lactic acid bacteria count inevitably decreases after post-sterilization, the visual analysis shows little difference in viable lactic acid bacteria count between sterilization temperatures of 64℃ and 68℃, and between sterilization times of 10s and 20s. Therefore, to extend the shelf life of fermented milk, the optimal process conditions for post-sterilized fermented milk are determined as follows: temperature 64℃, time 20s. After 20 days of refrigeration, the viable lactic acid bacteria count of the post-sterilized fermented milk is 3.4 × 10⁻¹⁰. 6 The cfu / mL count of the lactic acid bacteria was 1.1 × 10⁻⁶ after 15 days of storage at room temperature. 6 The cfu / mL level meets the requirements specified in the national standard (≥106 cfu / mL).

[0032] Table 2. Range analysis of orthogonal experiments with different post-sterilization temperatures and times.

[0033] To determine the accuracy of the experimental results, an analysis of variance was conducted on sensory evaluation, water-holding capacity, and lactic acid bacteria count for different post-sterilization temperatures and times. The results are shown in Tables 3, 4, and 5. The orthogonal analysis of variance shows that the post-sterilization temperature had a significant effect on the pH value of the fermented milk (P < 0.05), while the post-sterilization time had no significant effect on the pH value of the fermented milk (P > 0.05). Table 3. Analysis of variance table showing the effects of different post-sterilization temperatures and times on the sensory properties of fermented milk.

[0034] Table 4. Analysis of variance table showing the effect of different post-sterilization temperatures and times on the water-holding capacity of fermented milk.

[0035] Table 5. Analysis of variance table showing the effect of different post-sterilization temperatures and times on the number of lactic acid bacteria in fermented milk.

[0036] In this embodiment, heat treatment of fermented milk after processing helps to extend its shelf life. This is mainly because heat treatment can deactivate the starter culture and enzymes, as well as other contaminants such as mold and yeast.

[0037] A method for using a post-sterilization device for fermented milk production includes the following steps: S1. When it is necessary to perform fermented milk sterilization through a single heat exchanger 203, the temperature control conveying device 2071 conveys hot water upward. Since the other three first solenoid valves 2073 are closed, the hot water directly enters the single heat exchanger 203 and can flow back to the inner cavity 2052 through the second solenoid valve 213. It is then reheated by the temperature control conveying device 2071 and circulated, so that the hot water exchanges heat with the fermented milk in the single heat exchanger 203. The fermented milk is heated and sterilized. The sterilized fermented milk is discharged through the manifold 2051 and the milk outlet pipe 204. S2. When four sets of heat exchange equipment 203 need to be simultaneously heat-exchanged and sterilized, the multi-way valve 208 is opened. The fermented milk is diverted into the multi-way valve 208 through the milk inlet pipe 202 and the connector 2062, so that the four heat exchange equipment 203 can simultaneously exchange heat to carry out the fermented milk sterilization operation. After sterilization, it is discharged through the milk outlet pipe 204. When four sets of heat exchange equipment 203 need to be connected in series for heat exchange, the other three multi-way valves 208 and three lower three-way valves 210 are controlled to switch the opening of the pipe 209, so that the four heat exchange equipment 203 form a series path. At this time, the fermented milk passes through the four heat exchange equipment 203 in sequence for sterilization. S3. When maintenance is required, the first gear 2064 and the second gear 2065 are driven by the motor 2063 to rotate the drum 2061. The drum 2061 drives the heat exchange equipment 203 to rotate through the multi-way valve 208. When the heat exchange equipment 203 is in the position of the detachable section 2014, the detachable section 2014 is removed before the heat exchange equipment 203 is maintained. S4. When it is necessary to test the sealing performance of heat exchanger 203, close the connection between the lower three-way valve 210 and heat exchanger 203, and operate the multi-way valve 208 to connect to heat exchanger 203 separately. Transfer heat exchanger 203 to the bottom of test assembly 101 through the middle drive assembly 206. At this time, operate the electric push rod 1014 to control the connector 1013 to connect with multi-way valve 208. Then, the fan 1011 inputs a certain amount of gas into the fermentation milk channel of heat exchanger 203. The pressure sensor 1012 detects the internal pressure change of heat exchanger 203, thereby realizing the sealing test of heat exchanger 203.

[0038] The above are merely preferred embodiments 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 post-sterilization device for fermented milk production, comprising a sterilization unit (100), characterized in that, The sterilization device (100) is equipped with a detection component (101) and a heat exchange mechanism (200). The heat exchange mechanism (200) includes a holding component (201) and an output component (205). The holding component (201) is provided with four heat exchange devices (203). The inner cavity (2052) of the output component (205) is connected to four second solenoid valves (213). The four second solenoid valves (213) are respectively connected to the four outlets of the heat exchange devices (203). The manifold (2051) of the output component (205) is connected to four lower three-way valves (210). The four lower three-way valves (210) are respectively connected to the fermented milk output ports of the four heat exchange devices (203). The output component (205) is provided with a temperature control component (207), and a drive component (206) is provided above the temperature control component (207). The four first solenoid valves (2073) of the temperature control component (207) are respectively connected to the inlets of the four heat exchange devices (203). The fermented milk inlets of the four heat exchange devices (203) are respectively connected to the four multi-way valves (208). The four multi-way valves (208) pass through the rotating drum (2061) and are connected to the same connector (2062). The multi-way valves (208) are connected to the lower three-way valve (210) through pipes (209) in an alternating manner, thereby connecting the four heat exchange devices (203) in series.

2. The post-sterilization equipment for fermented milk production according to claim 1, characterized in that, The retaining assembly (201) includes two retaining rings (2011) and two detachable sections (2014). The two retaining rings (2011) are installed in the sterilization device (100) by multiple mounting plates (2012). Both ends of the retaining rings (2011) are provided with bayonets (2015).

3. The post-sterilization equipment for fermented milk production according to claim 2, characterized in that, Both ends of the detachable section (2014) are fixed to two bayonets (2015) by bolts, and a handle (2013) is fixedly connected between the two detachable sections (2014).

4. The post-sterilization equipment for fermented milk production according to claim 3, characterized in that, The detection component (101) includes a fan (1011), which is installed in the sterilization device (100). The fan (1011) is connected to the connector (1013) via a hose, and a pressure sensor (1012) is provided on the connector (1013).

5. The post-sterilization equipment for fermented milk production according to claim 4, characterized in that, A connector (1016) is installed on the connector (1013). The connector (1016) is fixed to the electric push rod (1014). The electric push rod (1014) is fixedly connected to the sterilization device (100) through a fixing plate (1015).

6. The post-sterilization equipment for fermented milk production according to claim 5, characterized in that, The drive assembly (206) includes a mounting base (2066) and a rotating drum (2061). A motor (2063) is mounted on the mounting base (2066). The output shaft of the motor (2063) is fixedly connected to a first gear (2064). A second gear (2065) meshes with one side of the first gear (2064). The second gear (2065) is mounted on the rotating drum (2061). A connector (2062) is provided in the rotating drum (2061). The connector (2062) is rotatably mounted on the milk inlet pipe (202) through a bearing, and the connector (2062) is in communication with the milk inlet pipe (202).

7. The post-sterilization equipment for fermented milk production according to claim 6, characterized in that, The temperature control component (207) includes a temperature control conveying device (2071). The mounting base (2066) is installed on the temperature control conveying device (2071). The output port of the temperature control conveying device (2071) passes through the mounting base (2066) and is connected to a multi-port pipe (2072). The multi-port pipe (2072) passes through the rotating drum (2061) and is connected to four first solenoid valves (2073). The multi-port pipe (2072) is arranged in the rotating drum (2061), and one end of the multi-port pipe (2072) is rotatably installed on the output port of the temperature control conveying device (2071) through a bearing.

8. The post-sterilization equipment for fermented milk production according to claim 7, characterized in that, The output component (205) includes a manifold (2051) and two rotating rings (2053). The manifold (2051) is fixedly connected in the sterilization device (100). The manifold (2051) is connected to the milk outlet pipe (204). An inner cavity (2052) is provided in the manifold (2051). The inner cavity (2052) is connected to the temperature-controlled conveying device (2071). Both of the aforementioned rotating rings (2053) are rotatably mounted in the manifold (2051) and inner cavity (2052) respectively via bearings, and four lower three-way valves (210) and four second solenoid valves (213) are respectively mounted on the two rotating rings (2053).

9. The post-sterilization equipment for fermented milk production according to claim 8, characterized in that, Four limiting wheels (212) are provided on one side of the heat exchange device (203). Two of the limiting wheels (212) travel on the retaining ring (2011) and the detachable section (2014). Four auxiliary wheels (211) are provided below the heat exchange device (203). The four auxiliary wheels (211) travel on the bottom wall of the sterilization device (100).

10. The method of using the post-sterilization equipment for fermented milk production according to claim 9, characterized in that, Includes the following steps: S1. When it is necessary to sterilize fermented milk through a single heat exchanger (203), the temperature control component (207) delivers hot water to the separate heat exchanger (203) for circulating heat exchange to sterilize the fermented milk. The sterilized fermented milk is discharged through the manifold (2051) and the milk outlet pipe (204). S2. When four sets of heat exchange equipment (203) need to be used for simultaneous heat exchange and sterilization, the fermented milk is diverted into the multi-way valve (208) through the milk inlet pipe (202) and connector (2062), so that the four heat exchange equipment (203) can be used for simultaneous heat exchange and sterilization of the fermented milk. After sterilization, it is discharged through the milk outlet pipe (204). When four sets of heat exchange equipment (203) need to be used for series heat exchange, the other three multi-way valves (208) and three lower three-way valves (210) are controlled to switch the opening of the pipeline (209), so that the fermented milk passes through the four heat exchange equipment (203) in sequence for sterilization. S3. When maintenance is required, the central drive assembly (206) drives the heat exchange equipment (203) to rotate. When the heat exchange equipment (203) is in the position of the detachable section (2014), the detachable section (2014) is removed before the heat exchange equipment (203) is maintained. S4. When it is necessary to test the sealing performance of the heat exchange equipment (203), the electric push rod (1014) controls the connector (1013) to connect with the multi-way valve (208), and then the fan (1011) inputs a certain amount of gas into the fermentation milk channel of the heat exchange equipment (203). The pressure sensor (1012) detects the internal pressure change of the heat exchange equipment (203), thereby realizing the sealing test of the heat exchange equipment (203).

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