Low-temperature drying device for horse milk powder production and production process thereof

Abstract

The low-temperature drying device for horse milk powder production comprises a heat preservation tank body, a liquid nitrogen cavity is formed in the upper end of the heat preservation tank body, the liquid nitrogen cavity is communicated with an electric pressure release valve, and an electric test sensor is installed in the liquid nitrogen cavity; an input nozzle is annularly mounted in the liquid nitrogen cavity and communicated with a liquid nitrogen pipeline, mist nozzles are annularly mounted at the top of the liquid nitrogen cavity at equal intervals and penetrate through the top of the liquid nitrogen cavity to be communicated with an input pipe, a sublimation cavity is formed in the portion, at the lower end of the liquid nitrogen cavity, of the heat preservation tank body, and the bottom of the liquid nitrogen cavity is communicated with the sublimation cavity. According to the low-temperature drying device for horse milk powder production and the production process of the low-temperature drying device, the milk powder production efficiency is improved, and the situation that residual water vapor of a vacuum cold trap forms water to be combined with horse milk powder is further avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of milk powder production, and particularly to a low-temperature drying device for producing horse milk powder and its production process. Background Art

[0002] A patent application with the publication number CN202310139452.7 discloses a drying device for milk powder production and its drying process, which relates to the technical field of centrifugal spray dryers. It includes a substrate, on the upper surface of which a processing tank is fixedly installed. An air duct and a preparation pipe are communicated with the side wall of the processing tank. A material tank is placed on the upper surface of the substrate. A feeding pipe is fixedly installed on the side wall of the processing tank. An inclination device is provided on the surface of the substrate. The inclination device includes two fixing blocks, both of which are fixedly connected to the upper surface of the substrate, and a rotating shaft is rotatably installed inside the two fixing blocks. By setting the gravity device, this invention facilitates the automatic inclination during the extraction of the material tank, reduces the difficulty of extracting the less material at the bottom of the material tank by the feeding pipe, increases the extraction difficulty of the material at the bottom of the material tank, and it is easy to cause waste when the raw materials in the material tank are not used up, and improves the utilization rate of the materials as much as possible.

[0003] In the prior art including the above-mentioned patent, milk powder production includes spray drying method and freeze-vacuum drying method, etc. The freeze-vacuum drying method is an advanced process that removes moisture through low-temperature freezing and vacuum sublimation. It can retain the active nutritional components in dairy products to the greatest extent, and can better maintain the color, aroma, and taste of milk powder. And the final moisture content is low, which is beneficial for long-term preservation and prevents deterioration.

[0004] The existing freeze-dried low-temperature produced milk powder has the following problems: First, before the vacuum sublimation of milk freeze-drying, it is necessary to manually layer and arrange the milk freeze-drying to avoid stacking and affecting effective sublimation. And later, it is also necessary to manually remove the milk powder on the stainless steel tray, resulting in a decrease in efficiency.

[0005] Second, after the vacuum sublimation of milk freeze-drying milk powder, due to the precipitation of protein and fat during the sublimation process, wall sticking is likely to occur and needs to be scraped off.

[0006] Third, because there is still a theoretical saturated vapor pressure of water molecules during low-temperature condensation, and a monolayer water film will be adsorbed on the surface of the cold trap. At the same time, fluctuations in the system vacuum degree may cause the re-sublimation of the condensed ice, resulting in the fact that the vacuum cold trap cannot completely remove water vapor, and the milk powder will combine with this small amount of water vapor.

[0007] Therefore, a low-temperature drying device for producing horse milk powder and its production process are needed to solve the above problems. Summary of the Invention

[0008] The purpose of the present invention is to provide a low-temperature drying device for producing horse milk powder and its production process, so as to solve the technical problems proposed in the above background technology.

[0009] To achieve the above purpose, the present invention provides the following technical solutions: A low-temperature drying device for producing horse milk powder and its production process, including a heat preservation tank body. A liquid nitrogen cavity is opened at the upper end of the heat preservation tank body. The liquid nitrogen cavity is communicated with an electric pressure relief valve. An electric test sensor is installed in the liquid nitrogen cavity. Input nozzles are installed annularly in the liquid nitrogen cavity. The input nozzles are communicated with a liquid nitrogen pipeline. Mist nozzles are installed annularly and equidistantly at the top of the liquid nitrogen cavity. The mist nozzles pass through the top of the liquid nitrogen cavity and are communicated with an input pipe. A sublimation cavity is opened in the heat preservation tank body at the lower end of the liquid nitrogen cavity. The bottom of the liquid nitrogen cavity is communicated with the sublimation cavity. An electric valve is installed at the communication position. A uniform distribution layer is installed in the sublimation cavity. An inclined downward feeding port is opened at the bottom of the sublimation cavity. A perforation is opened in the inclined downward feeding port. The perforation is rotationally connected with an assisting detachment device. The electric test sensor and the electric pressure relief valve are both signal-connected to a numerical control system. A discharge groove is opened on the inner wall at the lower end of the heat preservation tank. A through discharge hole is opened in the discharge groove. A second valve is installed in the discharge hole; The uniform distribution layer includes a plurality of first uniform distribution ring plates arranged vertically and equidistantly. One end of each first uniform distribution ring plate is connected to the outer ring of a first connecting rod arranged annularly and equidistantly. The other end of the first connecting rod is connected to the inner ring of a second uniform distribution ring plate. One end of a second connecting rod arranged annularly and equidistantly is connected to the outer ring of the second uniform distribution ring plate. The other end of the second connecting rod is connected to the inner wall of the sublimation cavity. The outer ring of the first uniform distribution ring plate is larger than the inner ring of the second uniform distribution ring plate; Further, the first uniform distribution ring plate slopes upward horizontally and obliquely from the inside to the outside at a certain degree, and the second uniform distribution ring plate slopes upward horizontally and obliquely from the inside to the outside at a certain degree.

[0010] Further, the assisting detachment device includes a fixed-value motor. The fixed-value motor is connected to the heat preservation tank body. The output end of the fixed-value motor is in transmission connection with an outer transmission shaft. The outer transmission shaft passes through the first uniform distribution ring plate and is connected to the inner rings of a plurality of opening and closing scraping blocks arranged symmetrically and vertically and equidistantly. Opening and closing openings are symmetrically opened at the central position of the first uniform distribution ring plate.

[0011] Further, the outer ring of the opening and closing scraping block is connected to one end of a scraping strip. The bottom of the scraping strip is in contact with the surface of the first uniform distribution ring plate.

[0012] Further, the output end of the fixed-value motor is connected to a differential gear set. The differential gear set is in transmission connection with the outer transmission shaft and is in transmission connection with an inner rotating shaft.

[0013] Further, the top of the inner rotating shaft passes through the outer transmission shaft and is connected to a centrifugal lifting impeller.

[0014] Further, the blades of the centrifugal lifting impeller are backward-curved blades with the leading edge of the blade tilted backward.

[0015] Furthermore, a low-temperature drying device for producing horse milk powder and its production process, the method comprising the following steps: S1: Quantitatively input horse milk into the input pipe through a pump and then into the atomizing nozzle. The atomizing nozzle sprays the horse milk into granular form. When entering the liquid nitrogen chamber, instantaneous phase change occurs in the -196°C cryogenic environment of the liquid nitrogen chamber (freezing rate > 50°C / s) to form spherical ice crystal particles with a porous structure. At the same time, measure the pressure through the internal electrical test sensor. When the pressure is high, open the pressure relief valve to form an air flow cycle to ensure stable pressure. And when the temperature of the liquid nitrogen chamber is less than -65°C through the temperature sensor, the control system triggers the pump to input liquid nitrogen into the liquid nitrogen pipeline and the input nozzle to quickly cool down, avoiding the inability to form ice crystal particles. And before inputting horse milk, the liquid nitrogen will also keep the sublimation chamber at a sub-zero temperature to ensure that the ice crystal particles will not melt. Then the horse milk forms ice crystal particles and enters the sublimation chamber through the electric valve opened at the bottom of the liquid nitrogen chamber. And the bottom of the liquid nitrogen chamber is horizontally inclined upward by 15° from the inside to the outside, which helps the ice crystal particles to fall into the uniform distribution layer; S2: After entering the sublimation chamber, since the first uniform distribution ring plate is horizontally inclined upward by 5 degrees from the inside to the outside, some horse milk ice crystal particles will remain on the first uniform distribution ring plate, and the excess will overflow and flow to the second uniform distribution ring plate and enter the first uniform distribution ring plate of the next layer, so as to automatically distribute the horse milk ice crystal particles; S3: Drive the outer transmission shaft to rotate by the rotation of the output end of the fixed-value motor, so that the opening and closing scraper block opens and closes periodically, thereby controlling the intermittent falling of the milk powder. Since the milk powder is prone to wall sticking during the sublimation process due to the precipitation of proteins and fats, the opening and closing scraper block drives the transmission scraping bar synchronously when rotating, scraping the milk powder attached to the first uniform distribution ring plate, making it smoothly enter the opening and closing port, and finally efficiently discharging through the inclined downward feeding port, realizing continuous and uniform milk powder collection. And the differential gear set can drive the inner rotating shaft and the outer transmission shaft to rotate at the same time, further saving energy. And the differential formed by the differential gear set can further make the centrifugal lifting impeller rotate faster. And the centrifugal lifting impeller can diffuse some water vapor that cannot be completely discharged to the periphery to form water that falls from the inner wall into the discharge holes of the discharge groove, and then open the second valve for discharge.

[0016] Compared with the prior art, the beneficial effects of the present invention are: (1) Due to the first uniform distribution ring plate being horizontally inclined upward by 5 degrees from the inside to the outside, some horse milk ice crystal particles will remain on the first uniform distribution ring plate, and the excess will overflow and flow to the second uniform distribution ring plate and enter the first uniform distribution ring plate of the next layer, so as to automatically distribute the horse milk ice crystal particles, without manual layering, the efficiency is improved, and this layout can avoid the disorder of steam escape caused by thickness accumulation during vacuum sublimation, the extension of the steam transfer path and the drying time caused by material accumulation, and the increase of moisture content; (2) The rotation of the output end of the fixed-value motor drives the outer transmission shaft to rotate, causing the opening and closing scraping block to open and close periodically, thereby controlling the intermittent falling of the milk powder. Since the milk powder is prone to sticking to the wall during the sublimation process due to the precipitation of protein and fat, the opening and closing scraping block drives the transmission scraping strip synchronously during rotation to scrape off the milk powder adhering to the first uniform distribution ring plate, enabling it to smoothly enter the opening and closing port and finally be efficiently discharged through the inclined downward feeding port, achieving continuous and uniform collection of the milk powder; (3) The differential gear set can drive the inner rotating shaft and the outer rotating shaft to rotate simultaneously, further saving energy. Moreover, the differential formed by the differential gear set can further increase the speed of the centrifugal lifting impeller. The centrifugal lifting impeller can diffuse some of the water vapor that cannot be completely discharged to the periphery to form water that falls from the inner wall into the discharge holes of the discharge groove, and then the second valve is opened for discharge, thus better preventing the water vapor from forming water and combining with the horse milk powder. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic cross-sectional structural diagram of a part of the present invention; Figure 3 is Figure 2 the enlarged view at A in Figure 4 is a schematic structural diagram of the assisting and separating device in the present invention; Figure 5 is the front view of the uniform distribution layer in the present invention; Figure 6 is a schematic partial structural diagram of the uniform distribution layer in the present invention; Figure 7 is Figure 6 the enlarged view at B in Figure 8 is a schematic partial structural diagram of the assisting and separating device in the present invention; Figure 9 is a schematic structural diagram of the centrifugal lifting impeller in the present invention.

[0018] In the figure: 1 - heat preservation tank body, 11 - liquid nitrogen cavity, 12 - sublimation cavity, 13 - inclined downward feeding port, 2 - input pipe, 21 - atomizing nozzle, 3 - pressure relief valve, 4 - liquid nitrogen pipeline, 41 - input nozzle, 5 - uniform distribution layer, 51 - first uniform distribution ring plate, 511 - opening and closing port, 52 - first connecting rod, 53 - second uniform distribution ring plate, 54 - second connecting rod, 6 - assisting and separating device, 61 - fixed-value motor, 62 - differential gear set, 63 - outer transmission shaft, 64 - opening and closing scraping block, 65 - scraping strip, 66 - inner rotating shaft, 67 - centrifugal lifting impeller. Detailed Embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1-9 , a technical solution provided by the present invention: a low-temperature drying device and its production process for mare milk powder, including a heat preservation tank body 1. A liquid nitrogen cavity 11 is opened at the upper end of the heat preservation tank body 1. The liquid nitrogen cavity 11 is communicated with an electric pressure relief valve 3. An electric test sensor is installed in the liquid nitrogen cavity 11. Input nozzles 41 are annularly installed in the liquid nitrogen cavity 11. The input nozzles 41 are communicated with a liquid nitrogen pipeline 4. Mist nozzles 21 are annularly and equidistantly installed at the top of the liquid nitrogen cavity 11. The mist nozzles 21 pass through the top of the liquid nitrogen cavity 11 and are communicated with an input pipe 2. A sublimation cavity 12 is opened in the heat preservation tank body 1 at the lower end of the liquid nitrogen cavity 11. The bottom of the liquid nitrogen cavity 11 is communicated with the sublimation cavity 12. An electric valve is installed at the communication position. A uniform distribution layer 5 is installed in the sublimation cavity 12. An inclined discharge port 13 is opened at the bottom of the sublimation cavity 12. A perforation is opened in the inclined discharge port 13. The perforation is rotationally connected with an assisting detachment device 6. The electric test sensor and the electric pressure relief valve 3 are both connected to the numerical control system in a signal manner. A discharge groove 14 is opened on the inner wall at the lower end of the heat preservation tank 1. A through discharge hole is opened in the discharge groove 14. A second valve is installed in the discharge hole. Quantitative mare milk is input into the input pipe 2 by means of pump pressurization and then enters the mist nozzle 21. The mist nozzle 21 sprays the mare milk into granular form. And when it enters the liquid nitrogen cavity 11, instantaneous phase change (freezing rate > 50 °C / s) occurs in the -196 °C cryogenic environment in the liquid nitrogen cavity 11 to form spherical ice crystal particles with a porous structure. At the same time, the internal electric test sensor measures the pressure. When the pressure is high, the pressure relief valve 3 is opened to form an air flow cycle to ensure pressure stability. And when the temperature of the liquid nitrogen cavity 11 is less than -65 °C through the temperature sensor, the control system triggers the pump to input liquid nitrogen into the liquid nitrogen pipeline 4 and the input nozzles 41 to rapidly cool down, avoiding the inability to form ice crystal particles. And before inputting mare milk, the liquid nitrogen will also keep the sublimation cavity 12 at a sub-zero temperature to ensure that the ice crystal particles will not melt. Then the mare milk forms ice crystal particles and enters the sublimation cavity 12 through the opening of the electric valve at the bottom of the liquid nitrogen cavity 11. And the bottom of the liquid nitrogen cavity 11 is horizontally inclined upward by 15° from the inside to the outside, which helps the ice crystal particles to descend into the uniform distribution layer 5. The uniform distribution layer 5 can ensure the uniform distribution of the ice crystal particles, thus helping with sublimation.

[0021] The uniform distribution layer 5 includes a plurality of first uniform distribution ring plates 51 arranged vertically and equidistantly. One end of each first uniform distribution ring plate 51 is connected to one end of a first connecting rod 52 arranged annularly and equidistantly. The other end of the first connecting rod 52 is connected to the inner ring of a second uniform distribution ring plate 53. The outer ring of the second uniform distribution ring plate 53 is connected to one end of a second connecting rod 54 arranged annularly and equidistantly. The other end of the second connecting rod 54 is connected to the inner wall of the sublimation chamber 12. The outer ring of the first uniform distribution ring plate 51 is larger than the inner ring of the second uniform distribution ring plate 53. The first uniform distribution ring plate 51 slopes upward 5 degrees horizontally from the inside to the outside, and the second uniform distribution ring plate 53 slopes upward 5 degrees horizontally from the inside to the outside. After entering the sublimation chamber 12, due to the first uniform distribution ring plate 51 sloping upward 5 degrees horizontally from the inside to the outside, some mare milk ice crystal particles will remain on the first uniform distribution ring plate 51, and the excess will overflow and flow to the second uniform distribution ring plate 53 and enter the first uniform distribution ring plate 51 of the next layer, thereby automatically distributing the mare milk ice crystal particles, improving the efficiency without manual layering, and this layout can avoid the disorder of steam escape caused by thickness accumulation during vacuum sublimation, the extension of the steam transfer path and the drying time caused by material accumulation, and the increase of moisture content.

[0022] The assisting discharging device 6 includes a fixed-value motor 61. The fixed-value motor 61 is connected to the heat preservation tank body 1. The output end of the fixed-value motor 61 is in transmission connection with an outer transmission shaft 63. The outer transmission shaft 63 passes through the first uniform distribution ring plate 51 and is connected to the inner rings of a plurality of opening and closing scraping blocks 64 arranged symmetrically and vertically and equidistantly. Symmetric opening and closing openings 511 are provided at the center position of the first uniform distribution ring plate 51. The outer ring of the opening and closing scraping block 64 is connected to one end of a scraping strip 65. The bottom of the scraping strip 65 is in contact with the surface of the first uniform distribution ring plate 51. When the mare milk is sublimated into milk powder, the outer transmission shaft 63 is rotated by the rotation of the output end of the fixed-value motor 61, so that the opening and closing scraping blocks 64 open and close periodically, thereby controlling the intermittent falling of the milk powder. Since the milk powder is prone to sticking to the wall during the sublimation process due to the precipitation of protein and fat, the opening and closing scraping blocks 64 drive the transmission scraping strip 65 synchronously when rotating, scrape off the milk powder attached to the first uniform distribution ring plate 51, make it smoothly enter the opening and closing opening 511, and finally be efficiently discharged through the obliquely downward discharging port 13, realizing continuous and uniform collection of milk powder.

[0023] The output end of the fixed-value motor 61 is connected to a differential gear set 62. The differential gear set 62 is in transmission connection with the outer transmission shaft 63. The differential gear set 62 is in transmission connection with an inner rotating shaft 66. The top of the inner rotating shaft 66 passes through the outer transmission shaft 63 and is connected to a centrifugal lifting impeller 67. The blades of the centrifugal lifting impeller 67 are backward-curved blades with the leading edge of the blade tilting backward. The differential gear set 62 can drive the inner rotating shaft 66 and the outer transmission shaft 63 to rotate simultaneously, further saving energy, and the differential formed by the differential gear set 62 can further make the centrifugal lifting impeller 67 rotate faster. The centrifugal lifting impeller 67 can diffuse some water vapor that cannot be completely discharged to the periphery to form water that falls from the inner wall into the discharge holes of the discharge groove 14, and then the second valve is opened for discharge, thereby better avoiding the combination of water vapor to form water and mare milk powder.

[0024] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or essential characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A low-temperature drying device for producing horse milk powder, comprising a heat preservation tank body (1), characterized in that: The upper end of the heat-insulating tank body (1) is provided with a liquid nitrogen cavity (11), the liquid nitrogen cavity (11) is communicated with an electric pressure relief valve (3), an electric test sensor is installed in the liquid nitrogen cavity (11), an input nozzle (41) is annularly installed in the liquid nitrogen cavity (11), the input nozzle (41) is communicated with a liquid nitrogen pipeline (4), fog nozzles (21) are annularly and equidistantly installed at the top of the liquid nitrogen cavity (11), the fog nozzles (21) pass through the top of the liquid nitrogen cavity (11) and are communicated with an input pipe (2), a sublimation cavity (12) is provided in the heat-insulating tank body (1) at the lower end of the liquid nitrogen cavity (11), the bottom of the liquid nitrogen cavity (11) is communicated with the sublimation cavity (12), an electric valve is installed at the communicating position, a uniform distribution layer (5) is installed in the sublimation cavity (12), an inclined downward feeding port (13) is provided at the bottom of the sublimation cavity (12), a perforation is provided in the inclined downward feeding port (13), and the perforation is rotationally connected with an assisting and removing device (6). The electric test sensor and the electric pressure relief valve (3) are both in signal connection with a numerical control system. A discharge groove (14) is provided on the inner wall of the lower end of the heat-insulating tank body (1), a through discharge hole is provided in the discharge groove (14), and a second valve is installed in the discharge hole; The uniform distribution layer (5) includes a plurality of first uniform distribution ring plates (51) arranged vertically and equidistantly. One end of each first uniform distribution ring plate (51) is connected to the outer ring of a first connecting rod (52) arranged annularly and equidistantly. The other end of the first connecting rod (52) is connected to the inner ring of a second uniform distribution ring plate (53). One end of the outer ring of the second uniform distribution ring plate (53) is connected to a second connecting rod (54) arranged annularly and equidistantly. The other end of the second connecting rod (54) is connected to the inner wall of the sublimation cavity (12). The outer ring of the first uniform distribution ring plate (51) is larger than the inner ring of the second uniform distribution ring plate (53).

2. The low-temperature drying device for producing horse milk powder according to claim 1, characterized in that: The first uniform distribution ring plate (51) is horizontally inclined upward by 5 degrees from the inside to the outside, and the second uniform distribution ring plate (53) is horizontally inclined upward by 5 degrees from the inside to the outside.

3. The low-temperature drying device for producing horse milk powder according to claim 1, wherein: The assisting and removing device (6) includes a fixed-value motor (61). The fixed-value motor (61) is connected to the heat-insulating tank body (1). The output end of the fixed-value motor (61) is in transmission connection with an outer transmission shaft (63). The outer transmission shaft (63) passes through the first uniform distribution ring plate (51) and is connected to the inner ring of a plurality of opening and closing scraping blocks (64) which are symmetrically and vertically arranged equidistantly. Opening and closing openings (511) are symmetrically provided at the central position of the first uniform distribution ring plate (51).

4. The low-temperature drying device for producing horse milk powder according to claim 3, characterized in that: One end of the outer ring of the opening and closing scraping block (64) is connected to a scraping strip (65), and the bottom of the scraping strip (65) is in contact with the surface of the first uniform distribution ring plate (51).

5. The low-temperature drying device for producing horse milk powder according to claim 3, characterized in that: The output end of the fixed-value motor (61) is connected to a differential gear set (62). The differential gear set (62) is in transmission connection with the outer transmission shaft (63), and the differential gear set (62) is in transmission connection with an inner rotating shaft (66).

6. The low-temperature drying device for producing horse milk powder according to claim 5, characterized in that: The top of the inner rotating shaft (66) passes through the outer transmission shaft (63) and is connected to a centrifugal lifting impeller (67).

7. A low-temperature drying device for producing horse milk powder according to claim 6, characterized in that: The blades of the centrifugal lifting impeller (67) are backward-curved blades with the leading edges of the blades inclined backward.

8. A low-temperature drying device for producing horse milk powder according to claim 1, characterized in that: The operation process thereof is as follows: S1: Quantitatively input mare's milk into the input pipe (2) by means of pump pressurization and then into the atomizing nozzle (21). The atomizing nozzle (21) sprays the mare's milk into granular form. When it enters the liquid nitrogen chamber (11), instantaneous phase change occurs in the -196 °C cryogenic environment of the liquid nitrogen chamber (11) (freezing rate > 50 °C / s) to form spherical ice crystal particles with a porous structure. At the same time, measure the pressure through the internal electrical test sensor. When the pressure is high, open the pressure relief valve (3) to form an air flow cycle to ensure stable pressure. And when the temperature of the liquid nitrogen chamber (11) is less than -65 °C through the temperature sensor, the control system triggers the pump to input liquid nitrogen into the liquid nitrogen pipeline (4) and the input nozzle (41) to rapidly cool down, avoiding the inability to form ice crystal particles. And before inputting mare's milk, the liquid nitrogen also keeps the sublimation chamber (12) below zero to ensure that the ice crystal particles will not melt. Then the mare's milk forms ice crystal particles and enters the sublimation chamber (12) through the electric valve opened at the bottom of the liquid nitrogen chamber (11). And the bottom of the liquid nitrogen chamber (11) slopes upward horizontally by 15° from the inside to the outside, which helps the ice crystal particles to fall into the uniform distribution layer (5). S2: After entering the sublimation chamber (12), since the first uniform distribution ring plate (51) slopes upward horizontally by 5 degrees from the inside to the outside, some mare's milk ice crystal particles will remain on the first uniform distribution ring plate (51), and the excess will overflow and flow to the second uniform distribution ring plate (53) and enter the first uniform distribution ring plate (51) of the next layer, thus automatically distributing the mare's milk ice crystal particles. S3: Drive the outer transmission shaft (63) to rotate by the rotation of the output end of the fixed-value motor (61), so that the opening and closing scraping block (64) opens and closes periodically, thereby controlling the intermittent falling of the milk powder. Since the milk powder is prone to wall sticking during the sublimation process due to the precipitation of protein and fat, the opening and closing scraping block (64) drives the transmission scraping bar (65) synchronously during rotation to scrape off the milk powder attached to the first uniform distribution ring plate (51), making it smoothly enter the opening (511), and finally efficiently discharge through the inclined discharge port (13) to achieve continuous and uniform collection of milk powder. And the differential gear set (62) can drive the inner rotating shaft (66) and the outer transmission shaft (63) to rotate at the same time, further saving energy. And the differential formed by the differential gear set (62) can further make the centrifugal lifting impeller (67) rotate faster. The centrifugal lifting impeller (67) can diffuse some water vapor that cannot be completely discharged to the periphery to form water that falls from the inner wall into the discharge holes of the discharge groove (14), and then open the second valve for discharge.

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