Freeze-drying equipment and preparation method for freeze-dried biscuits for infants

Abstract

The invention discloses a freeze-drying device and a preparation method for preparing freeze-dried biscuits for infants, and relates to the technical field of biscuit preparation. The freeze-drying device and the preparation method for preparing freeze-dried biscuits for infants specifically include the following steps: S1, mixing mixed rice; S2, soaking mixed rice; S3, steaming mixed rice; S4, crushing mixed rice into pulp; S5, enzymolysis; S6, inactivating enzymes; S7, mixing basic raw materials; S8, mixing raw materials; S9, mixing fruits and vegetables; S10, using freeze-drying equipment to freeze and shape biscuits; using freeze-drying technology to shape biscuits can avoid the loss of nutrients, and low-temperature manufacturing is delicious and does not cause internal heat, and the addition of various fruits, vegetables and meats makes the nutrients richer, and infant edible strains can also be added to protect the stomach and intestines of infants.

Description

Technical Field

[0001] The invention relates to the technical field of biscuit preparation, in particular to freeze-drying equipment and a preparation method for freeze-dried biscuits for infants. Background Art

[0002] Most biscuits on the market are made of single wheat flour as the main raw material, with sugar added to increase sweetness, with or without fruit and vegetable powder, and with nutrients such as minerals and vitamins, and are baked at a high temperature of 180°C. This processing method mainly uses high temperature to prepare biscuits, which has the following problems:

[0003] 1) High temperature will cause a large amount of nutrients to be lost;

[0004] 2) Although fruit and vegetable powders are added, the nutrients in these fruit and vegetable powders are also destroyed by high temperatures;

[0005] 3) This processing method also limits the rice flour to the addition of edible strains for infants and young children.

[0006] Although a small number of biscuits are currently formed using freeze-drying technology, they usually need to be frozen multiple times and then transferred between different freezers. The temperature changes during the transfer between different freezers using a cart will also affect the product quality and cause a large amount of cold air to leak from the freezer, increasing power loss. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a freeze-drying device and a preparation method for freeze-dried biscuits for infants, which solves the problems that the existing biscuits prepared by high temperature will affect the nutrition of the biscuits and limit the addition of strains, and the freeze-drying method has the problem that temperature changes during the transfer process affect the quality and increase energy loss.

[0008] To achieve the above objectives, the present invention is implemented through the following technical scheme: a method for preparing freeze-dried biscuits for infants, specifically comprising the following steps:

[0009] S1. Mixed rice: germ rice, brown rice, millet and corn, mixed in a ratio of 1:1:1:1 or other ratios;

[0010] S2, soaking the mixed rice: soaking the mixed rice at 40-50° C. for 40-50 min;

[0011] S3, steaming mixed rice: add 9 times the water, boil over high heat for 10 minutes, then turn to low heat for 20 minutes;

[0012] S4, crushing the mixed rice into pulp: adding the cooked mixed rice into a wall-breaking machine and crushing it into pulp for later use;

[0013] S5, enzymatic hydrolysis: cool the temperature to about 50°C, add 0.04% amylase, and keep the temperature for enzymatic hydrolysis for 45 minutes;

[0014] S6, enzyme inactivation: heating to 90-100°C to inactivate the enzyme;

[0015] S7. Mix the basic ingredients: wheat flour, eggs, milk, and knead the dough in a vacuum without adding a drop of water. Then pass through the baking line to bake out the aroma of biscuits in the form of flakes, crumbs, or powder.

[0016] S8, raw material mixing: the biscuits obtained in step 7 and the rice milk obtained in step 6 are mixed, and milk is added and stirred evenly;

[0017] S9, Mixed fruits and vegetables: Add cooked fruits and vegetables;

[0018] S10. Using freeze-drying equipment to freeze the shape of biscuits: first quick-freeze the mixed slurry prepared in step S9 at -40°C for 20 minutes, then place it at -20°C for 6 hours to allow the quick-frozen product to expand naturally, and finally deep-freeze it in a freeze-drying bin at -30°C for 6 hours, vacuum dry it and control the vacuum degree in the freeze-drying bin to ≤50pa, the temperature of the mixed slurry prepared in step S9 is -45°C to -50°C, the temperature of the cold trap is -50°C, and freeze-drying is performed to obtain freeze-dried biscuits for infants with a water content of less than 5%.

[0019] Preferably, fruits include: one or more of apples, blueberries, strawberries, berries, and avocados; vegetables include: one or more of spinach, broccoli, kale, tomatoes, and yams; oligofructose, nutrients (including minerals and vitamins), and edible strains for infants and young children are added at the same time; cooked meat ingredients can also be added.

[0020] The present invention also discloses a freeze-drying device for preparing freeze-dried biscuits for infants, comprising a freeze-drying bin and a refrigeration device installed on the side thereof, wherein the freeze-drying bin is provided with three layers of chambers separated by a spiral partition structure, wherein the refrigeration device is provided with three layers corresponding to the three layers of chambers and refrigerated to different temperatures, wherein the biscuit raw materials are placed in the chambers through a mold plate and sequentially pass through the three layers of chambers for triple freezing, and a vacuum device for extracting air from the bottom layer of the chamber is fixedly connected to the side of the freeze-drying bin;

[0021] The freeze-drying bin is opened at the top and bottom, and the spiral partition structure includes spiral support bars that are fixedly connected to the inner wall of the freeze-drying bin in a spiral manner, and four groups of partitions are arranged on the upper and lower sides of the inner side of the spiral support bars to separate the three-layer chambers therebetween, and a vertical partition sleeve is fixedly connected in the middle of the partition, and openings for the mold plate to pass through are opened on both sides of the vertical partition sleeve, and a sealing plate is inserted inside the vertical partition sleeve;

[0022] The mold plate is a spiral plate with a spiral angle consistent with that of the spiral support bar. The mold plate can descend along the spiral angle of the spiral support bar and pass through the vertical partition sleeve at a designated position.

[0023] Preferably, the mold disk is viewed from above as a disk with a circular hole in the middle, and the two ends are truncated and offset up and down, the top of the mold disk is evenly provided with mold grooves, the bottom edge of the mold disk is evenly rotatably connected to a number of ball bearings, and the end faces at both ends of the mold disk are fixedly connected to small buffer springs.

[0024] Preferably, the sealing plate includes a fixed plug plate and a movable plug plate connected to one side of the plate through an airbag cushion, one end of the fixed plug plate is fixedly connected to a sealing handle that can be magnetically attracted to the outer surface of the freeze-drying chamber, and the movable plug plate is fixedly connected to a sealing rubber pad on the side facing away from the airbag cushion.

[0025] Preferably, a raw material adding structure is provided on one side of the top of the inner cavity of the freeze-drying chamber and above the uppermost vertical partition sleeve, and the raw material adding structure adds biscuit raw materials into the rotating mold plate.

[0026] Preferably, the raw material adding structure includes a feed pipe and a recovery pipe located at the lower rear side thereof, the feed pipe is connected to a feed source through an external feed hose and a feed pump body, the recovery pipe is connected to a recovery container through a return hose and a negative pressure pump, both ends of the feed pipe and the recovery pipe are fixedly connected through end plates, a plurality of discharge ports are evenly provided at the bottom of the feed pipe, a feed trough is provided at the front side of the recovery pipe, a rubber plate extending downward from the front side is fixedly connected to the bottom of the feed trough, and a plurality of inclined guide plates inclined toward the right rear side are fixedly connected to the front side of the recovery pipe and located on the top of the rubber plate;

[0027] A reed switch is fixedly connected to the bottom of the recovery tube, and magnets for triggering the reed switch are embedded and fixedly connected to the tops of both ends of the mold plate.

[0028] Preferably, a bracket is fixedly connected to the bottom of the freeze-drying chamber, and a conveyor belt for conveying the mold tray is provided on the inner side of the bracket, and a receiving structure for receiving the mold tray is placed on the conveyor belt.

[0029] Preferably, the supporting structure includes a base frame, a fixed seat is installed at the center of the top of the base frame, and the external sliding sleeve of the fixed seat is provided with a buffer sleeve, a large buffer spring is provided between the top of the inner cavity of the buffer sleeve and the top of the fixed seat, the buffer sleeve is fixedly connected with support columns on all sides, and the support columns on all sides are spirally lowered layer by layer, and the external rotating sleeve of the support column is provided with a rubber sleeve.

[0030] Preferably, both sides of the top of the base frame are rotatably connected with swing arms, the rotation point of the swing arm is located in the middle and biased to one side of the fixed seat, and the side of the swing arm is bent upward and extended to the bottom of the buffer sleeve, so that when the buffer sleeve presses down on the side of the swing arm, the other side of the swing arm can be tilted upward, and the other side of the swing arm extends out of the base frame;

[0031] Both sides of the inner side of the conveyor belt frame are fixedly connected with positioning frames. When the receiving structure passes by, the positioning frame can block the swing arm, and when the other side of the swing arm is tilted upward, it can be free from the blocking of the positioning frame.

[0032] Beneficial Effects

[0033] The present invention provides a freeze-drying device and a preparation method for freeze-dried biscuits for infants. Compared with the prior art, it has the following beneficial effects:

[0034] (1) The freeze-drying equipment and preparation method for preparing freeze-dried biscuits for infants and young children use a freeze-drying process to shape the biscuits, which can avoid the loss of nutrients. The low-temperature production makes them delicious and does not cause irritation. The addition of various fruits, vegetables and meats also enriches the nutrients. Edible strains for infants and young children can also be added to protect the stomach and intestines of infants and young children.

[0035] (2) The freeze-drying equipment and preparation method for preparing freeze-dried biscuits for infants and young children, by setting a spiral partition structure in the freeze-drying chamber and correspondingly setting a spiral mold plate to carry the raw materials, so that the mold plate can spirally rotate and descend along the spiral partition structure, and then can automatically pass through three chambers with different temperatures for multiple freezing, and move by gravity, without the need for manual transfer, with high efficiency, and the transfer is carried out in a rotating manner, only a channel corresponding to the cross-sectional size of the mold plate needs to be opened between adjacent chambers, without the need to open a large area of ​​the channel, which can reduce the loss of cold air as much as possible, and the method of inserting and pulling the sealing plate also makes it easy to control the conduction and closure of the chamber at any time.

[0036] (3) The freeze-drying equipment and preparation method for preparing freeze-dried biscuits for infants and young children provide a ball bearing at the bottom of the mold plate so that the mold plate can slide more smoothly along the spiral support strip, and the small buffer springs provided at both ends of the mold plate can prevent the mold plates from colliding with each other and causing leakage of the biscuit raw materials.

[0037] (4) The freeze-drying equipment and preparation method for freeze-dried biscuits for infants and young children have a sealing plate that is configured as a multi-layer flexible structure. The sealing plate can be elastically expanded after insertion and can be further expanded under negative pressure, thereby effectively ensuring the sealing of the vacuum chamber. The elastic setting does not affect the extraction under normal pressure, and the structure is simple and practical.

[0038] (5) The freeze-drying equipment and preparation method for preparing freeze-dried biscuits for infants are provided with a raw material adding structure in the freeze-drying chamber, which can evenly add raw materials to the mold plate during its rotation and downward sliding process. At the same time, the excess raw materials can be scraped back into the recovery pipe by the rubber plate and the inclined guide plate and then extracted, which can prevent the adhesion of more raw materials on the part of the mold plate other than the mold groove. At the same time, the excess raw materials can be recovered and reused, which reduces the waste of raw materials and further reduces the cost loss. The reed switch magnets at the bottom of the recovery pipe that can trigger the mold plate are arranged at the head and tail of the mold plate. The pump body corresponding to the raw material adding structure can be automatically started and stopped before and after the mold plate passes, thereby realizing automatic start and stop of feeding, which is convenient to use.

[0039] (6) The freeze-drying equipment and preparation method for preparing freeze-dried biscuits for infants and young children are characterized by arranging a conveyor belt conveying receiving structure at the bottom of the freeze-drying bin, and the receiving structure can directly receive the fallen mold plate. When the mold plate falls, the spirally distributed rubber sleeve of the receiving structure is used in conjunction with the large buffer spring in the buffer sleeve to perform double buffering. At the same time, the mold plate can be slowly rotated and fall onto the bottom frame, so that an uneven mold plate can be transported smoothly and the risk of the internal biscuits falling out and breaking can be reduced. At the same time, the swing arm is used in conjunction with the positioning frame to keep the receiving structure directly below the freeze-drying bin during continuous transportation. By pressing the buffer sleeve down and bouncing the swing arm, the receiving structure can automatically break away from the restriction of the positioning frame and be transported away after the mold plate falls, which is convenient to control. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A three-dimensional diagram of the structure of the present invention;

[0041] Figure 2 is a cross-sectional view of a freeze-drying chamber of the present invention;

[0042] Figure 3 For the present invention Figure 2 A schematic diagram of a partial enlarged view at A in the middle;

[0043] Figure 4 It is a front view of the mold plate of the present invention;

[0044] Figure 5 A top view of the mold plate of the present invention;

[0045] Figure 6 is a three-dimensional diagram of a sealing plate of the present invention;

[0046] Figure 7 It is a front view of the raw material adding structure of the present invention;

[0047] Figure 8 It is a side sectional view of the raw material adding structure of the present invention;

[0048] Fig. 9 It is a side view of the receiving structure and the conveyor belt of the present invention;

[0049] Fig.10 It is a cross-sectional view of the receiving structure of the present invention;

[0050] Fig.11 It is a top view of the receiving structure and the positioning frame of the present invention.

[0051] In the figure: 1. Freeze-drying chamber; 2. Refrigeration device; 3. Spiral partition structure; 31. Spiral support bar; 32. Partition plate; 33. Vertical partition sleeve; 4. Mold plate; 41. Mold groove; 42. Ball bearing; 43. Small buffer spring; 44. Magnetic steel; 5. Support structure; 51. Base frame; 52. Fixed seat; 53. Buffer sleeve; 54. Large buffer spring; 55. Support column; 56. Rubber sleeve; 57. Swing arm; 6. Transport Conveying belt; 7. Positioning frame; 8. Sealing plate; 81. Fixed plug plate; 82. Airbag cushion; 83. Movable plug plate; 84. Sealing handle; 85. Sealing rubber pad; 9. Raw material adding structure; 91. Feeding pipe; 92. Recovery pipe; 93. Feeding hose; 94. End plate; 95. Feeding trough; 96. Rubber plate; 97. Oblique guide plate; 98. Reed switch; 99. Return hose; 10. Bracket; 11. Vacuum equipment. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] The present invention discloses a method for preparing freeze-dried biscuits for infants, which specifically comprises the following steps:

[0054] S1. Mixed rice: germ rice, brown rice, millet and corn, mixed in a ratio of 1:1:1:1 or other ratios;

[0055] S2, soaking the mixed rice: soaking the mixed rice at 40-50° C. for 40-50 min;

[0056] S3, steaming mixed rice: add 9 times the water, boil over high heat for 10 minutes, then turn to low heat for 20 minutes;

[0057] S4, crushing the mixed rice into pulp: adding the cooked mixed rice into a wall-breaking machine and crushing it into pulp for later use;

[0058] S5, enzymatic hydrolysis: cool the temperature to about 50°C, add 0.04% amylase, and keep the temperature for enzymatic hydrolysis for 45 minutes;

[0059] S6, enzyme inactivation: heating to 90-100°C to inactivate the enzyme;

[0060] S7. Mix the basic ingredients: wheat flour, eggs, milk, and knead the dough in a vacuum without adding a drop of water. Then pass through the baking line to bake out the aroma of biscuits in the form of flakes, crumbs, or powder.

[0061] S8, raw material mixing: the biscuits obtained in step 7 and the rice milk obtained in step 6 are mixed, and milk is added and stirred evenly;

[0062] S9, Mixed fruits and vegetables: Add cooked fruits and vegetables;

[0063] S10. Using freeze-drying equipment to freeze the shape of biscuits: first quick-freeze the mixed slurry prepared in step S9 at -40°C for 20 minutes, then place it at -20°C for 6 hours to allow the quick-frozen product to expand naturally, and finally deep-freeze it in a freeze-drying bin at -30°C for 6 hours, vacuum dry it and control the vacuum degree in the freeze-drying bin to ≤50pa, the temperature of the mixed slurry prepared in step S9 is -45°C to -50°C, the temperature of the cold trap is -50°C, and freeze-drying is performed to obtain freeze-dried biscuits for infants with a water content of less than 5%.

[0064] Among them, preferred fruits include: one or more of apples, blueberries, strawberries, berries, and avocados; preferred vegetables include: one or more of spinach, broccoli, kale, tomatoes, and yams; at the same time, oligofructose, nutrients (including minerals and vitamins), and edible strains for infants and young children are added; cooked meat ingredients can also be added.

[0065] This process uses freeze-drying technology to shape biscuits, which can avoid the loss of nutrients. The low-temperature production makes them delicious and non-irritating. The addition of various fruits, vegetables and meats also makes the nutrients richer. Edible strains for infants and young children can also be added to protect the stomachs of infants and young children.

[0066] At the same time, the present invention also discloses a freeze-drying device for preparing freeze-dried biscuits for infants, and specifically includes the following embodiments:

[0067] Figure 1-3 The first embodiment is shown: it includes a freeze-drying chamber 1 and a refrigeration device 2 installed on its side, the freeze-drying chamber 1 is provided with an inner lining made of heat-insulating and antifreeze material, the freeze-drying chamber 1 is provided with three layers of chambers divided by a spiral partition structure 3, the refrigeration device 2 is provided with three corresponding to the three layers of chambers and refrigerated to different temperatures, the biscuit raw materials are placed in the chamber through a mold plate 4 and sequentially pass through the three layers of chambers for triple freezing, and a vacuum device 11 for extracting the air in the bottom chamber is fixedly connected to the side of the freeze-drying chamber 1;

[0068] The freeze-drying bin 1 is opened at the top and bottom, and the spiral partition structure 3 includes a spiral support bar 31 that is fixedly connected to the inner wall of the freeze-drying bin 1 in a spiral manner, and four groups of partitions 32 are arranged on the inner side of the spiral support bar 31 to separate the three-layer chambers therebetween, and a vertical partition sleeve 33 is fixedly connected in the middle of the partition 32, and openings for the mold plate 4 to pass through are opened on both sides of the vertical partition sleeve 33, and a sealing plate 8 is inserted inside the vertical partition sleeve 33;

[0069] The mold plate 4 is a spiral plate with a spiral angle consistent with that of the spiral support bar 31 . The mold plate 4 can descend along the spiral angle of the spiral support bar 31 and pass through the vertical partition sleeve 33 at a designated position.

[0070] By setting a spiral partition structure 3 in the freeze-drying chamber 1 and correspondingly setting a spiral mold plate 4 to carry the raw materials, the mold plate 4 can spirally rotate and descend along the spiral partition structure 3, and then can automatically pass through three chambers with different temperatures for multiple freezing. It uses gravity to move, and does not require manual transfer, which is highly efficient. Moreover, the transfer is carried out in a rotating manner, and only a channel corresponding to the cross-sectional size of the mold plate 4 needs to be opened between adjacent chambers. There is no need to open a large area of ​​the channel, and the loss of cold air can be reduced as much as possible. The method of inserting and pulling the sealing plate 8 also makes it easy to control the conduction and closure of the chamber at any time.

[0071] Figure 4-5 A second embodiment is shown, which mainly differs from the first embodiment in that the mold disk 4 is a disk with a circular hole in the middle when viewed from above, and its two ends are truncated and offset up and down, mold grooves 41 are evenly arranged on the top of the mold disk 4, and a plurality of ball bearings 42 are evenly connected to the bottom edge of the mold disk 4 for rotation, and small buffer springs 43 are fixedly connected to the end faces at both ends of the mold disk 4.

[0072] By arranging the ball bearings 42 at the bottom of the mold plate 4, the mold plate 4 can slide more smoothly along the spiral support strip 31, and the small buffer springs 43 arranged at both ends of the mold plate 4 can avoid the problem of leakage of biscuit materials caused by collision between the mold plates 4.

[0073] Figure 6 A third embodiment is shown, which mainly differs from the second embodiment in that the sealing plate 8 includes a fixed plug plate 81 and a movable plug plate 83 connected to one side of the fixed plug plate 81 through an airbag cushion 82, one end of the fixed plug plate 81 is fixedly connected to a sealing handle 84 that can be magnetically attracted to the outer surface of the freeze-drying chamber 1, and the side of the movable plug plate 83 facing away from the airbag cushion 82 is fixedly connected to a sealing rubber pad 85.

[0074] By setting the sealing plate 8 as a multi-layer flexible structure, the sealing plate 8 can expand elastically after insertion and can further expand under negative pressure, thereby effectively ensuring the sealing of the vacuum chamber. The elastic setting does not affect the extraction under normal pressure, and the structure is simple and practical.

[0075] Figure 2 and 7 -8 shows a fourth embodiment, which mainly differs from the third embodiment in that a raw material adding structure 9 is provided on one side of the top of the inner cavity of the freeze-drying chamber 1 and above the uppermost vertical partition sleeve 33, and the raw material adding structure 9 adds biscuit raw materials into the rotating mold plate 4.

[0076] The raw material adding structure 9 includes a feed pipe 91 and a recovery pipe 92 located at the lower rear side thereof. The feed pipe 91 is connected to the feed source through an external feed hose 93 and a feed pump body. The recovery pipe 92 is connected to a recovery container through a return hose 99 and a negative pressure pump. The negative pressure pump is a low-pressure pump with a small suction force and is only used to absorb the raw materials flowing into the recovery pipe 92 to avoid high pressure from sucking in a large amount of air. Both ends of the feed pipe 91 and the recovery pipe 92 are fixedly connected by an end plate 94. A plurality of discharge ports are evenly provided at the bottom of the feed pipe 91. A feed trough 95 is provided at the front side of the recovery pipe 92. A rubber plate 96 extending downward from the front side is fixedly connected to the bottom of the feed trough 95. A plurality of inclined guide plates 97 tilted toward the right rear side are fixedly connected to the front side of the recovery pipe 92 and located on the top of the rubber plate 96.

[0077] A reed switch 98 is fixedly connected to the bottom of the recovery tube 92 , and magnets 44 for triggering the reed switch 98 are embedded and fixedly connected to the tops of both ends of the mold plate 4 .

[0078] The raw material adding structure 9 arranged in the freeze-drying chamber 1 can evenly add raw materials to the mold plate 4 during its rotation and downward sliding. At the same time, the excess raw materials can be scraped back into the recovery pipe 92 by the rubber plate 96 and the inclined guide plate 97 and then extracted, so as to avoid more raw materials adhering to the part other than the mold groove 41 on the mold plate 4. At the same time, the excess raw materials can be recovered and reused, thus reducing the waste of raw materials and further reducing the cost loss. The reed switch 98 magnet 44 at the bottom of the recovery pipe 92 can be triggered at the head and tail of the mold plate 4, and the pump body corresponding to the raw material adding structure 9 can be automatically started and stopped before and after the mold plate 4 passes, so as to realize automatic start and stop feeding, which is convenient to use.

[0079] Figure 1 and 9 -11 shows the fifth embodiment, which mainly differs from the fourth embodiment in that a bracket 10 is fixedly connected to the bottom of the freeze-drying chamber 1, and a conveyor belt 6 for conveying the mold plate 4 is provided on the inner side of the bracket 10, and a receiving structure 5 for receiving the mold plate 4 is placed on the conveyor belt 6.

[0080] The supporting structure 5 includes a base frame 51, and the corners of the base frame 51 are chamfered so that the positioning frame 7 can guide it in the center. A fixed seat 52 is installed at the center of the top of the base frame 51, and the external sliding sleeve of the fixed seat 52 is provided with a buffer sleeve 53. A large buffer spring 54 is provided between the top of the inner cavity of the buffer sleeve 53 and the top of the fixed seat 52. Support columns 55 are fixedly connected on all sides of the buffer sleeve 53, and the support columns 55 on all sides are spirally lowered layer by layer. The external rotating sleeve of the support column 55 is provided with a rubber sleeve 56. The inner layer of the rubber sleeve 56 is a plastic sleeve to maintain the rotation effect, and the outer layer is made of foam or soft rubber or silicone material for buffering.

[0081] Both sides of the top of the bottom frame 51 are rotatably connected with swing arms 57, the rotation point of the swing arm 57 is located in the middle and biased to one side of the fixed seat 52, and the side of the swing arm 57 is bent upward and extends to the bottom of the buffer sleeve 53, so that when the buffer sleeve 53 presses down on the side of the swing arm 57, the other side of the swing arm 57 can be tilted upward, and the other side of the swing arm 57 extends out of the bottom frame 51;

[0082] Both sides of the inner side of the conveyor belt 6 frame are fixedly connected with positioning frames 7. When the receiving structure 5 passes by, the positioning frames 7 can block the swing arm 57, and the other side of the swing arm 57 can be freed from the blocking of the positioning frames 7 when it is tilted upward.

[0083] A conveyor belt 6 is provided at the bottom of the freeze-drying bin 1 to convey the receiving structure 5, and the receiving structure 5 can directly receive the fallen mold plate 4. When the mold plate 4 falls, the spirally distributed rubber sleeve 56 of the receiving structure 5 is used in conjunction with the large buffer spring 54 in the buffer sleeve 53 to perform double buffering. At the same time, the mold plate 4 can also be slowly rotated and fall onto the bottom frame 51, so that the uneven mold plate 4 can also be transported smoothly, and the risk of the internal biscuits falling and breaking can be reduced. At the same time, the swing arm 57 is used in conjunction with the positioning frame 7 to keep the receiving structure 5 directly below the freeze-drying bin 1 during continuous transportation. The mold plate 4 presses down the buffer sleeve 53 and pops up the swing arm 57, so that after the mold plate 4 falls, the receiving structure 5 can automatically break away from the restriction of the positioning frame 7 and be transported away, which is convenient to control.

[0084] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited, and conventional equipment can be used.

[0085] When in use, start the refrigeration device 2 to refrigerate the corresponding chamber; when freezing, first pull out the top sealing plate 8, put the mold plate 4 in from the top of the freeze-drying chamber 1, and make it rotate and descend along the spiral support bar 31. When the bottom end of the mold plate 4 reaches the bottom of the raw material adding structure 9, the magnet 44 at the bottom end of the mold plate 4 triggers the reed switch 98 to generate an electrical signal, which controls the feed pump to extract the biscuit raw materials and discharge them into the feed hose 93, and then discharge them downward into the mold groove 41 on the mold plate 4. The excess raw materials outside the mold groove 41 are guided by the rubber plate 96 and the inclined guide plate 97 as the mold plate 4 rotates, and are scraped into the recovery pipe 92, and are extracted into the recovery container for reuse under the action of the negative pressure pump.

[0086] The mold plate 4 first passes through the uppermost vertical partition sleeve 33 and enters the first chamber until it is blocked by the sealing plate 8 in the second vertical partition sleeve 33. After multiple sets of mold plates 4 have entered, the sealing plate 8 is inserted back for sealing, and the raw materials are frozen in the first step; after the first step of freezing is completed, the sealing plate 8 in the second vertical partition sleeve 33 is pulled out, so that the mold plate 4 slides into the second chamber for the second step of freezing, and so on, and finally discharged from the bottom;

[0087] After the mold plate 4 slides into the third layer chamber, it needs to be vacuumed and the pressure is released before discharge to restore the air pressure in the third layer chamber to normal. The air inhaled at this time should be refrigerated air to avoid a rapid increase in temperature in the third layer chamber. The cold air extracted by the vacuum equipment 11 can be discharged into the container for storing refrigerated air for recycling.

[0088] When the conveyor belt 6 transports the receiving structure 5 to the bottom of the freeze-drying chamber 1, the swing arms 57 extending from both sides of the receiving structure 5 are blocked by the positioning frame 7, so that the receiving structure 5 stays in place. When the mold plate 4 falls on the receiving structure 5, the buffer sleeve 53 is first pressed down by the support column 55 and the rubber sleeve 56, so that the buffer sleeve 53 presses down the swing arm 57 to lift its outer end, thereby making it detach from the positioning frame 7 and continue to be transported. At the same time, the large buffer spring 54 and the rubber sleeve 56 buffer the mold plate 4. At the same time, the mold plate 4 rotates along the trajectory of the multiple groups of rubber sleeves 56 and falls to the bottom frame 51 for stable placement.

[0089] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0090] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A freeze-drying device for preparing freeze-dried biscuits for infants, comprising a freeze-drying chamber and a refrigeration device installed on the side thereof, characterized in that: The freeze-drying bin is divided into three layers of chambers by a spiral partition structure, and the refrigeration device is provided with three chambers corresponding to the three layers and refrigerated to different temperatures. The biscuit raw materials are placed in the chamber through the mold plate and pass through the three layers of chambers in sequence for triple freezing. The side of the freeze-drying bin is fixedly connected to a vacuum device for extracting the air in the bottom chamber; The freeze-drying bin is opened at the top and bottom, and the spiral partition structure includes spiral support bars that are fixedly connected to the inner wall of the freeze-drying bin in a spiral manner, and four groups of partitions are arranged on the upper and lower sides of the inner side of the spiral support bars to separate the three-layer chambers therebetween, and a vertical partition sleeve is fixedly connected in the middle of the partition, and openings for the mold plate to pass through are opened on both sides of the vertical partition sleeve, and a sealing plate is inserted inside the vertical partition sleeve; The mold plate is a spiral plate with a spiral angle consistent with that of the spiral support bar. The mold plate can descend along the spiral angle of the spiral support bar and pass through the vertical partition sleeve at a designated position.

2. The freeze-drying equipment for preparing freeze-dried biscuits for infants according to claim 1, characterized in that: The mold plate is a disk with a round hole in the middle when viewed from above, and its two ends are truncated and offset up and down, the top of the mold plate is evenly provided with mold grooves, the bottom edge of the mold plate is evenly rotatably connected to a plurality of ball bearings, and the end faces at both ends of the mold plate are fixedly connected to small buffer springs.

3. The freeze-drying equipment for preparing freeze-dried biscuits for infants according to claim 1, characterized in that: The sealing plate includes a fixed plug plate and a movable plug plate connected to one side of the plate through an airbag cushion. One end of the fixed plug plate is fixedly connected to a sealing handle that can be magnetically attracted to the outer surface of the freeze-drying bin. The movable plug plate is fixedly connected to a sealing rubber pad on the side facing away from the airbag cushion.

4. The freeze-drying equipment for preparing freeze-dried biscuits for infants according to claim 1, characterized in that: A raw material adding structure is arranged on one side of the top of the inner cavity of the freeze-drying bin and above the uppermost vertical partition sleeve, and the raw material adding structure adds biscuit raw materials into the rotating mold plate.

5. The freeze-drying equipment for preparing freeze-dried biscuits for infants according to claim 4, characterized in that: The raw material adding structure includes a feed pipe and a recovery pipe located at the lower rear side thereof, the feed pipe is connected to a feed source through an external feed hose and a feed pump body, the recovery pipe is connected to a recovery container through a return hose and a negative pressure pump, both ends of the feed pipe and the recovery pipe are fixedly connected through end plates, a plurality of discharge ports are evenly provided at the bottom of the feed pipe, a feed trough is provided at the front side of the recovery pipe, a rubber plate extending downward from the front side is fixedly connected to the bottom of the feed trough, and a plurality of oblique guide plates inclined toward the right rear side are fixedly connected to the front side of the recovery pipe and located on the top of the rubber plate; A reed switch is fixedly connected to the bottom of the recovery tube, and magnets for triggering the reed switch are embedded and fixedly connected to the tops of both ends of the mold plate.

6. The freeze-drying equipment for preparing freeze-dried biscuits for infants according to claim 1, characterized in that: A bracket is fixedly connected to the bottom of the freeze-drying bin, and a conveyor belt for conveying the mold plate is arranged on the inner side of the bracket, and a receiving structure for receiving the mold plate is placed on the conveyor belt.

7. The freeze-drying equipment for preparing freeze-dried biscuits for infants according to claim 6, characterized in that: The supporting structure includes a base frame, a fixed seat is installed at the center of the top of the base frame, and the external sliding sleeve of the fixed seat is provided with a buffer sleeve, a large buffer spring is provided between the top of the inner cavity of the buffer sleeve and the top of the fixed seat, the buffer sleeve is fixedly connected with support columns on all sides, and the support columns on all sides are spirally lowered layer by layer, and the external rotating sleeve of the support column is provided with a rubber sleeve.

8. The freeze-drying equipment for preparing freeze-dried biscuits for infants according to claim 7, characterized in that: Both sides of the top of the base frame are rotatably connected with swing arms, the rotation point of the swing arm is located in the middle and biased to one side of the fixed seat, and the side of the swing arm is bent upward and extended to the bottom of the buffer sleeve, so that when the buffer sleeve presses down on the side of the swing arm, the other side of the swing arm can be tilted upward, and the other side of the swing arm extends out of the base frame; Both sides of the inner side of the conveyor belt frame are fixedly connected with positioning frames. When the receiving structure passes by, the positioning frame can block the swing arm, and when the other side of the swing arm is tilted upward, it can be free from the blocking of the positioning frame.

9. A method for preparing freeze-dried biscuits for infants, characterized in that: The specific steps include: S1. Mixed rice: germ rice, brown rice, millet and corn, mixed in a ratio of 1:1:1:1 or other ratios; S2, soaking the mixed rice: soaking the mixed rice at 40-50° C. for 40-50 min; S3, steaming mixed rice: add 9 times the water, boil over high heat for 10 minutes, then turn to low heat for 20 minutes; S4, crushing the mixed rice into pulp: adding the cooked mixed rice into a wall-breaking machine and crushing it into pulp for later use; S5, enzymatic hydrolysis: cool the temperature to about 50°C, add 0.04% amylase, and keep the temperature for enzymatic hydrolysis for 45 minutes; S6, enzyme inactivation: heating to 90-100°C to inactivate the enzyme; S7. Mix the basic ingredients: wheat flour, eggs, milk, and knead the dough in a vacuum without adding a drop of water. Then pass through the baking line to bake out the aroma of biscuits in the form of flakes, crumbs, or powder. S8, raw material mixing: the biscuits obtained in step 7 and the rice milk obtained in step 6 are mixed, and milk is added and stirred evenly; S9, Mixed fruits and vegetables: Add cooked fruits and vegetables; S10. Use the freeze-drying equipment described in any one of claims 1 to 8 to freeze the shape of biscuits: first place the mixed slurry prepared in step S9 in an environment of minus 40°C for quick freezing for 20 minutes, then place it in an environment of minus 20°C and let it stand for 6 hours to allow the quick-frozen product to naturally expand, and finally place it in a freeze-drying bin at minus 30°C for deep freezing for 6 hours, vacuum drying and controlling the vacuum degree in the freeze-drying bin to ≤50pa, the temperature of the mixed slurry prepared in step S9 is minus 45°C to minus 50°C, the temperature of the cold trap is minus 50°C, and freeze-drying is performed to obtain infant freeze-dried biscuits with a water content of less than 5%.

Images