Trichosanthes kirilowii seed stir-frying device and method

Abstract

The invention belongs to the field of stir-frying of trichosanthes kirilowii seeds, and particularly relates to a stir-frying device and method for trichosanthes kirilowii seeds, the stir-frying device comprises a stir-frying machine and a hopper for feeding materials to the stir-frying machine, and a dry ice sand blasting pipe is arranged between the discharge end of the hopper and the inlet of the stir-frying machine; the dry ice sand blasting pipe sprays dry ice particles to the surfaces of the snakegourd seeds discharged from the discharging end of the hopper in a sand blasting mode through compressed air for surface treatment, and the snakegourd seeds subjected to surface treatment fall into the stir-frying machine to be stir-fried. According to the snakegourd seed stir-frying device and method, snakegourd seeds can be stir-fried at the temperature of 155 DEG C, and the stir-fried snakegourd seeds are crisp in taste, easy in shell opening, not prone to seed breaking, long in shelf life and high in quality.

Description

Technical Field

[0001] The present invention belongs to the technical field of stir-frying snakegourd seeds, and particularly relates to a stir-frying device and method for snakegourd seeds. Background Art

[0002] Snakegourd seeds are the seeds of Trichosanthes kirilowii Maxim., a perennial herbaceous vine of the Cucurbitaceae family. They are named "snakegourd" because their fruits resemble small watermelons and hang from the vines. Snakegourd seeds are rich in nutritional value and have various effects, including clearing the lungs, resolving phlegm, relieving cough, and promoting bowel movements. In addition, snakegourd seeds are rich in unsaturated fatty acids, proteins, amino acids, trace elements (such as calcium, iron, zinc, selenium), and vitamin E, which are beneficial to human health.

[0003] The processing process of snakegourd seeds includes steps such as cleaning, drying in the sun, and stir-frying. When stir-frying, the temperature and time need to be controlled to ensure their fragrance and taste. After stir-frying the snakegourd seeds into dry goods, they are generally called snakegourd seeds.

[0004] The stir-frying methods of snakegourd seeds are as follows:

[0005] Traditional stir-frying method:

[0006] When using an ordinary wok, the snakegourd seeds need to be stir-fried over medium to low heat for about 15 - 20 minutes until the outer shells of the seeds begin to crack and emit a fragrance, while paying attention to the heat to avoid overcooking on the outside and undercooking on the inside. The temperature for home stir-frying generally does not exceed 200°C.

[0007] Stir-frying with automated equipment (such as a stir-frying machine):

[0008] When using a direct-fired automatic stir-frying machine, the stir-frying time of snakegourd seeds is generally 30 - 40 minutes, and the stir-frying temperature is generally between 200°C and 220°C, which is used for drying and further enhancing the fragrance.

[0009] If it is necessary to enhance the flavor of the stir-fried snakegourd seeds, generally when the snakegourd seeds are almost cooked, a soup mixture containing edible essence, salt, sugar, oil essence, etc. is added. The soup mixture is sprayed in an atomized manner, and then stir-fried until dry or dried in an oven. The purpose is to let the snakegourd seeds absorb the taste of the seasonings and enhance the flavor.

[0010] The shelf life of stir-fried hanging melon seeds in ordinary packaging is generally 3 months at room temperature; when packaged with high-barrier materials and deoxidizers, the shelf life can even be extended to more than 8 months. This is because hanging melon seeds are rich in unsaturated fatty acids and are prone to oxidation and deterioration. Moreover, when using a stir-frying machine for stir-frying, the temperature can reach as high as 200°C; and as is well known, the stir-frying temperature has a significant impact on the shelf life of stir-fried goods. High-temperature and long-time roasting are likely to cause the oxidation and deterioration of hanging melon seeds, thus shortening the shelf life. And a too short shelf life greatly affects the shelf time of hanging melon seeds, thereby affecting their sales. In addition, due to the nature of the outer shell of hanging melon seeds itself, even after stir-frying, the outer shell is generally not very crispy. Some of the outer shells of hanging melon seeds are rather soft and cottony. When cracking them, it is impossible to crack the outer shell of the hanging melon seeds into complete petal shapes, but rather a mushy piece. Compared with watermelon seeds or sunflower seeds, their taste is average, so it will affect a certain group of consumers.

[0011] Therefore, how to extend the shelf life and the taste after stir-frying of hanging melon seeds is an urgent problem to be solved. Summary of the Invention

[0012] The purpose of the present invention is to provide a stir-frying device and method for hanging melon seeds to solve the above problems.

[0013] A stir-frying device and method for hanging melon seeds includes a stir-frying machine and a hopper for feeding the stir-frying machine. A dry ice sandblasting pipe is arranged between the discharge end of the hopper and the inlet of the stir-frying machine. The dry ice sandblasting pipe sprays dry ice particles in the form of sandblasting onto the surface of the hanging melon seeds discharged from the discharge end of the hopper through compressed air for surface treatment. After the surface treatment, the hanging melon seeds fall into the stir-frying machine for stir-frying.

[0014] A further improvement is that the dry ice sandblasting pipe is successively provided with a feed pipe, a spherical cavity, a first tapered pipe, a throat pipe, a second tapered pipe, and a discharge pipe in the direction of dry ice particle conveyance. The head end of the discharge pipe is aligned with the inlet of the stir-frying machine. The small end of the second tapered pipe and the small end of the first tapered pipe are both communicated with the throat pipe. The large end of the first tapered pipe and the tail end of the feed pipe are both communicated with the spherical cavity. The discharge end of the hopper is connected with a seed inlet pipe that is inclined and communicated with the spherical cavity.

[0015] A further improvement is that the first tapered pipe, the throat pipe, the second tapered pipe, and the discharge pipe are all coaxially arranged. The seed inlet pipe is located between the first tapered pipe and the feed pipe. The included angle between the axial direction of the seed inlet pipe and the axial direction of the first tapered pipe is an acute angle, and the included angle between the axial direction of the feed pipe and the axial direction of the first tapered pipe is an obtuse angle.

[0016] A further improvement is that several vibration plates are installed on the conical surface of the outer side wall of the hopper.

[0017] For further improvement, the included angle between the axial direction of the seed inlet pipe and the axial direction of the first tapered pipe is γ, where γ = 40°, and the included angle between the axial direction of the feed pipe and the axial direction of the seed inlet pipe is β, where β = 66°.

[0018] For further improvement, a lining pipe is arranged inside the feed pipe. The inner wall of the lining pipe is a tapered pipe cavity, and the small end of the tapered pipe cavity extends to the connection between the feed pipe and the spherical cavity.

[0019] For further improvement, the feed pipe is externally connected to a dry ice spraying machine. The air pressure of the compressed air output by the dry ice spraying machine is 0.21 - 0.22 MPa, the dry ice spraying amount is 0.8 - 1.2 kg / min, and the particle size of the dry ice particles is less than or equal to 3 mm.

[0020] For further improvement, the taper angle of the first tapered pipe is 27 ± 3°, and the taper angle of the second tapered pipe is 16 ± 3°.

[0021] For further improvement, the taper angle of the tapered pipe cavity is 33 ± 3°.

[0022] A method for stir-frying hanging melon seeds uses the above-mentioned hanging melon seed stir-frying device. The hanging melon seeds enter the dry ice sandblasting pipe through the hopper, and the dry ice sandblasting pipe sprays the dry ice particles in the form of sandblasting through compressed air to spray the hanging melon seeds in the dry ice sandblasting pipe into the internal part of the stir-fryer;

[0023] When the mass of the hanging melon seeds in the stir-fryer reaches the predetermined quality, the stir-frying temperature in the stir-fryer rises to 50 ± 2 °C and stir-fries for 1 - 2 min; then it rises to 70 ± 2 °C and stir-fries for 8 - 10 min;

[0024] Then, soup is sprayed into the stir-fryer, and the temperature is raised to 100 ± 2 °C for stir-frying for 8 - 10 min;

[0025] Finally, the temperature is raised to 155 ± 2 °C for stir-frying for 3 - 5 min to obtain the hanging melon seeds.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] By using the hanging melon seed stir-frying device and method of the present invention to stir-fry the hanging melon seeds, it can be stir-fried at a temperature of 155 °C, and the stir-frying temperature is lower than that of the prior art; before stir-frying, the dry ice sandblasting technology is used to pre-treat the hanging melon seeds, pre-stir-fry them at a low temperature of 70 ± 5 °C, and then spray the soup before stir-frying at a high temperature of 155 °C, so that the finally stir-fried hanging melon seeds have a crispy taste, the shell is easy to crack, there are few broken seeds, the shelf life is long, and the quality of the hanging melon seeds is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of the hanging melon seed stir-frying device of the present invention;

[0029] Figure 2 Schematic diagram of the connection between the hopper and the dry ice sandblasting pipe according to the present invention;

[0030] Figure 3 Schematic diagram of the structure of the dry ice sandblasting pipe according to Comparative Example 1;

[0031] Figure 4 is a curve graph of the change of β and the broken seed rate;

[0032] Figure 5 is a curve graph of the change of β and the cracking force. Detailed implementation manners

[0033] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0034] In the description of the present invention, it should be noted that unless otherwise specified, the meaning of "a plurality" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0036] Example 1

[0037] As Figure 1 shown, the hanging melon seed frying device includes a frying machine 10 and a hopper 20 for feeding the frying machine 10. A dry ice sandblasting pipe 30 is arranged between the discharge end of the hopper 20 and the inlet of the frying machine 10. The dry ice sandblasting pipe 30 sprays dry ice particles in the form of sandblasting on the surface of the hanging melon seeds discharged from the discharge end of the hopper 20 for surface treatment, and the hanging melon seeds after surface treatment fall into the frying machine 10 for frying.

[0038] In the present invention, the weighed snakegourd seeds are conveyed into the hopper 20. The dry ice sandblasting pipe 30 is externally connected to a dry ice spraying machine. The dry ice spraying machine outputs compressed air containing dry ice particles. The compressed air sprays the dry ice particles in the form of sandblasting, and performs surface treatment on the surface of the snakegourd seeds discharged from the discharge end of the hopper 20. The snakegourd seeds after surface treatment fall into the roasting machine 10 for roasting.

[0039] For the snakegourd seeds treated with the "dry ice sandblasting" technology, their surfaces will have microcracks, and the quick-freezing and vaporization effects of dry ice will affect the seeds inside the snakegourd seeds, such as the growth of ice crystals, dehydration effects, etc., which may lead to changes in the protein molecular structure, including aggregation, exposure of hydrophobic groups, and destruction of secondary and tertiary structures; when removing bound water, the hydrogen bond structure of the protein may be damaged, resulting in changes in the native structure, etc. All of these will cause more hydrophobic groups to be exposed on the surface of the protein in the seeds. Coupled with the subsequent roasting, a soup containing salt, acid or alkali is also sprayed, which will further promote protein denaturation; when roasting subsequently, first roast at a temperature of 70±5°C for 8-10 minutes, it will be very easy to roast fragrant and promote further changes in these denatured proteins; in addition, for these denatured proteins, after subsequent high-temperature roasting, the exuded oil will bind to the denatured protein on the surface, thus forming a hydrophobic film. The existence of this hydrophobic film will protect the roasted seeds inside the snakegourd seeds, thereby significantly improving the shelf life of snakegourd seeds.

[0040] Under the same packaging, the snakegourd seeds roasted by the present invention, using ordinary packaging, have a shelf life of 6 months at room temperature; using high-barrier materials and deoxidizers for packaging, the shelf life is 14 months.

[0041] For the snakegourd seeds roasted by the prior art, using ordinary packaging, the shelf life is 3 months at room temperature; using high-barrier materials and deoxidizers for packaging, the shelf life is 8 months.

[0042] Example 2

[0043] As Figure 1 、 2 shown, the dry ice sandblasting pipe 30 is successively provided with a feed pipe 36, a spherical cavity 35, a first tapered pipe 34, a throat pipe 33, a second tapered pipe 32, and a discharge pipe 31 in the direction of dry ice particle conveyance. The head end of the discharge pipe 31 is aligned with the inlet of the roasting machine 10. The small end of the second tapered pipe 32 and the small end of the first tapered pipe 34 are both communicated with the throat pipe 33. The large end of the first tapered pipe 34 and the tail end of the feed pipe 36 are both communicated with the spherical cavity 35. The discharge end of the hopper 20 is connected with an inclined seed inlet pipe 37 communicated with the spherical cavity 35.

[0044] The large end refers to the end with the largest diameter of structures such as tapered pipes and frustums, and the small end refers to the end with the smallest diameter of structures such as tapered pipes and frustums.

[0045] The first tapered tube 34, the throat tube 33, the second tapered tube 32 and the discharge pipe 31 are all coaxially arranged. The seed inlet pipe 37 is located between the first tapered tube 34 and the feed pipe 36. The included angle between the axial direction of the seed inlet pipe 37 and the axial direction of the first tapered tube 34 is an acute angle, and the included angle between the axial direction of the feed pipe 36 and the axial direction of the first tapered tube 34 is an obtuse angle.

[0046] The included angle between the axial direction of the seed inlet pipe 37 and the axial direction of the first tapered tube 34 is γ, γ = 40°, the included angle between the axial direction of the feed pipe 36 and the axial direction of the seed inlet pipe 37 is β, β = 66°. The included angle between the axial direction of the feed pipe 36 and the axial direction of the first tapered tube 34 is δ, δ = 106°.

[0047] For further pressure concentration, a lining tube 361 is arranged inside the feed pipe 36. The inner wall of the lining tube 361 is a tapered tube cavity 362, and the small end of the tapered tube cavity 362 extends to the connection between the feed pipe 36 and the spherical cavity 35.

[0048] If the air pressure of the compressed air is too high, or the dry ice particles are too large, too many, it will cause the seeds inside the hanging melon seeds to crack; but if the air pressure of the compressed air is too small, it cannot meet the use requirements. Therefore, pressure is concentrated through the tapered tube cavity 362, thereby improving the impact effect on the hanging melon seeds in the spherical cavity 35 and avoiding the hanging melon seeds from staying in the lower part of the spherical cavity 35.

[0049] The feed pipe is externally connected to a dry ice spraying machine. The air pressure of the compressed air output by the dry ice spraying machine is 0.21 - 0.22 MPa, the dry ice spraying amount is 0.8 - 1.2 kg / min, and the particle size of the dry ice particles is less than or equal to 3 mm.

[0050] The taper angle of the first tapered tube 34 is 27 ± 3°, and the taper angle of the second tapered tube 32 is 16 ± 3°. The taper angle of the tapered tube cavity 362 is 33 ± 3°.

[0051] Example 3

[0052] Hanging melon seed frying method:

[0053] Fry using the hanging melon seed frying device described in Example 2. The hanging melon seeds enter the dry ice sandblasting pipe through the hopper, and the dry ice sandblasting pipe sprays the dry ice particles in the form of sandblasting through compressed air to spray the hanging melon seeds in the dry ice sandblasting pipe into the frying machine.

[0054] When the hanging melon seeds in the frying machine reach a predetermined mass (such as 20 kg), the frying temperature in the frying machine is raised to 50 ± 2 °C and fried for 1 - 2 min; this step is mainly for preheating and accelerating the dissipation of the remaining dry ice particles.

[0055] Then, raise the temperature to 70 ± 5 °C and fry for 8 - 10 min until the fragrance is emitted.

[0056] Then, spray the soup stock into the frying machine, heat up to 100 ± 2 °C and fry for 8 - 10 min.

[0057] In the prior art, when stir-frying Trichosanthes kirilowii seeds, the soup stock is usually added when they are almost cooked; because only at that time do a large number of Trichosanthes kirilowii seeds crack and can absorb the flavor.

[0058] In the present invention, since the Trichosanthes kirilowii seeds have been surface-treated by the dry ice sandblasting technology and pre-fried at a low temperature of 70 ± 5 °C for a period of time, therefore, the way of adding the soup stock in advance can be adopted for frying; at this time, since the outer shell of the Trichosanthes kirilowii seeds has slight cracks, the soup stock can absorb the flavor; in addition, salts, acids or alkalis contained in the soup stock can further promote the denaturation of proteins and promote the formation of the subsequent hydrophobic film.

[0059] Finally, heat up to 155 ± 2 °C, conduct rapid frying for 3 - 5 min to obtain Trichosanthes kirilowii seeds.

[0060] In this embodiment, compared with the high-temperature frying above 200 °C, the final frying temperature of the present invention is only 155 ± 2 °C, which is also beneficial to reducing oxidation and deterioration, thereby promoting the extension of the shelf life.

[0061] In the present invention, the finally fried Trichosanthes kirilowii seeds have a taste similar to watermelon seeds, are relatively crispy and very easy to crack; the main reason is that the dry ice sandblasting pretreatment is adopted, so that the outer shell of the Trichosanthes kirilowii seeds is very crispy after frying and is very easy to crack.

[0062] 1. Water immersion test of Trichosanthes kirilowii seeds

[0063] Because in the present invention, for the fried Trichosanthes kirilowii seeds, there is a hydrophobic film on the seed surface (which can be inspected by the water immersion observation method), therefore, when immersed in water for a short time (60 s), it will not cause the seeds to be deeply wetted, and the change value Δζ of the seed moisture content ≤ 1%; while for the existing fried Trichosanthes kirilowii seeds, there is no hydrophobic film on the seed surface, so when immersed in water for a short time (60 s), it will cause the seeds to be deeply wetted, and the change value Δζ of the seed moisture content ≥ 3.6%; the change value of the seed moisture content = the seed moisture content after soaking - the seed moisture content before soaking; before measuring the moisture content of the seeds after soaking, first blot them dry with blotting paper, and then blow them with a hair dryer for 20 s to dry the water droplets on the surface of the soaked seeds, but it will not cause the water absorbed by the seed surface layer to decrease.

[0064] 2. Detection of broken seed rate

[0065] Due to the spherical design of the spherical cavity 35 and the inclined design of the seed inlet pipe 37, it is to ensure that the hanging melon seeds have sufficient contact time with the dry ice particles sprayed at high speed with water, thereby minimizing the usage amount of dry ice particles. At the same time, it avoids the hanging melon seeds being overly impacted by the dry ice particles. However, there is a drawback to the spherical shape of the spherical cavity 35, that is, it may cause some hanging melon seeds to stay in the lower part of the spherical cavity 35 for a long time or have an overly long residence time. If this situation exists in large quantities, it will cause the hanging melon seeds to be overly affected by the dry ice sandblasting effect. The most intuitive result is that for the hanging melon seeds falling into the frying machine 10, the seeds inside will be cracked. Therefore, by counting the broken seed rate of the hanging melon seeds output from the discharge pipe 31, it can be reflected whether there are hanging melon seeds staying in the lower part of the spherical cavity 35 for a long time or having an overly long residence time. In addition, an overly high broken seed rate of the hanging melon seeds will also affect the quality of the finished hanging melon seeds. Broken seed rate = total number of hanging melon seeds with broken seeds in the sample / total number of samples.

[0066] 3. Detection of cracking force

[0067] The test is carried out using a force measuring machine. An iron column with a diameter of 1 cm is installed on the downward pressure probe of the force measuring machine, and the minimum force (loaded along the length direction) required to crack the outer shell of the hanging melon seeds (the minimum number of cracked outer shells is 2 pieces) is measured, which is the cracking force; the average value is taken.

[0068] For some relatively soft hanging melon seeds in the prior art, their cracking force cannot be measured because during the test, even if the outer shell of the hanging melon seeds finally cracks, it will not completely separate, and finally the outer shell will be completely crushed.

[0069] In this example, the change value of seed moisture content Δζ = 0.72%; broken seed rate = 3.3%; cracking force = 1.97 N.

[0070] Example 4

[0071] To ensure that the hanging melon seeds in the hopper 20 are continuously conveyed into the dry ice sandblasting pipe 30, a number of vibrating plates 21 are installed on the conical surface of the outer side wall of the hopper 20.

[0072] Once some hanging melon seeds are temporarily blocked in the seed inlet pipe 37, the vibration applied by the vibrating plate 21 can effectively avoid the blockage.

[0073] Comparative Example 1

[0074] The difference between this example and Example 3 is that in this example, the spherical cavity 35 is only a mixing cavity and does not have to be limited to a spherical shape; the seed inlet 351 on the spherical cavity 35 is connected to the seed inlet pipe 37, and the seed inlet pipe 37 is not inclined but vertically arranged. In this example, γ = 90°, β = 90°, δ = 180°, as Figure 3 shown.

[0075] In this example, the broken seed rate = 61.5%. Since the broken seed rate is too high, it must be improved. Through experiments, it is found that by improving the orientations of the seed inlet pipe 37 and the feed pipe 36, this problem can be significantly solved.

[0076] Comparative Example 2

[0077] Change β, so that the angle corresponding to δ changes. The change curve of the broken seed rate is shown in Figure 4 , and the change curve of the cracking force is shown in Figure 5 , from Figure 4 and Figure 5 it can be seen that preferably, β = 106°.

[0078] Comparative Example 3

[0079] Use the hanging melon seed frying device described in Example 2 for frying. The hanging melon seeds enter the dry ice sandblasting pipe through the hopper. The dry ice sandblasting pipe sprays the dry ice particles in the form of sandblasting through compressed air, and sprays the hanging melon seeds in the dry ice sandblasting pipe into the frying machine.

[0080] When the hanging melon seeds in the frying machine reach the predetermined quality, the frying temperature in the frying machine is raised to 50 ± 2 °C and fried for 1 min. Then, soup ingredients are sprayed into the frying machine, and the temperature is raised to 100 ± 2 °C and fried for 20 min. Finally, the temperature is raised to 155 ± 2 °C for stir-frying for 5 min to obtain hanging melon seeds.

[0081] In this example, since pre-frying is not carried out at 70 °C for a period of time, it will affect the formation of the hydrophobic membrane and the membrane quality. Therefore, the change value of the seed moisture content in this example, Δζ = 2.75%.

[0082] As a reference, using the frying method of the prior art, the final change value of the seed moisture content, Δζ = 3.7%.

[0083] Comparative Example 4

[0084] Use the hanging melon seed frying device described in Example 2 for frying. The hanging melon seeds enter the dry ice sandblasting pipe through the hopper. The dry ice sandblasting pipe sprays the dry ice particles in the form of sandblasting through compressed air, and sprays the hanging melon seeds in the dry ice sandblasting pipe into the frying machine.

[0085] When the hanging melon seeds in the frying machine reach the predetermined quality, the frying temperature in the frying machine is raised to 50 ± 2 °C and fried for 1 min; then, the temperature is raised to 70 ± 5 °C and fried for 8 - 10 min until the fragrance is emitted. The temperature is raised to 100 ± 2 °C and fried for 8 - 10 min. The temperature is raised to 155 ± 2 °C for stir-frying for 3 min. Finally, soup ingredients are sprayed into the frying machine and fried for 2 min to obtain hanging melon seeds.

[0086] In this example, since the soup was added later, the protein denaturation was not thorough enough, and therefore the change in seed moisture content was Δζ=3.18%.

[0087] Comparative Example 5

[0088] Trichosanthes seeds were roasted according to the method of Example 3, with a final roasting temperature of 175±2°C for 5 minutes to obtain Trichosanthes seeds. In this example, the change in seed moisture content was Δζ = 10.16%. During the experiment in this example, it was found that even after roasting, the Trichosanthes seeds were relatively easy to crack, but the initial "dry ice sandblasting" treatment did not cause microcracks, which made it difficult to form a hydrophobic film in the later stage.

[0089] Similarly, if sunflower seeds are treated with "dry ice sandblasting" technology, their surface will crack over a large area, and the sunflower seeds will become bitter and gelatinized over a large area after being fried.

[0090] Comparative Example 6

[0091] The difference between this example and Example 3 is that only compressed air is used when feeding, and it does not contain dry ice particles. The final fried melon seeds are not flavorful because soup is added in advance, and the change value of seed moisture content Δζ=4.11%.

[0092] In addition, the experiment found that if the melon seeds were chilled, it was found that relying solely on freezing without particle impact would not produce the hydrophobic film described in the present invention. On the contrary, if the chilling time was too long, the seeds in the fried melon seeds would be soft and have a very poor taste.

[0093] From the above, it can be seen that in the present invention, if the melon seeds are not pretreated by dry ice sandblasting technology, if they are not pre-fried at a low temperature of 70±5°C for a period of time, and if the soup is not sprayed in advance, the formation of the hydrophobic film will be affected.

[0094] In the above embodiment, the melon seeds are cleaned and dried before frying, and the moisture content before frying is less than 27%.

[0095] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stir-frying device for hanging melon seeds, comprising a stir-frying machine (10) and a hopper (20) for feeding the stir-frying machine (10), characterized in that: A dry ice sandblasting pipe (30) is provided between the discharge end of the hopper (20) and the inlet of the frying machine (10). The dry ice sandblasting pipe (30) sprays dry ice particles in the form of sandblasting onto the surface of the hanging melon seeds discharged from the discharge end of the hopper (20) through compressed air for surface treatment. The hanging melon seeds after surface treatment fall into the frying machine (10) for frying.

2. The stir-frying device for snakegourd seeds according to claim 1, wherein: The dry ice sandblasting pipe (30) is successively provided with a feed pipe (36), a spherical cavity (35), a first tapered pipe (34), a throat pipe (33), a second tapered pipe (32), and a discharge pipe (31) in the direction of dry ice particle conveyance. The head end of the discharge pipe (31) is aligned with the inlet of the frying machine (10). The small end of the second tapered pipe (32) and the small end of the first tapered pipe (34) are both communicated with the throat pipe (33). The large end of the first tapered pipe (34) and the tail end of the feed pipe (36) are both communicated with the spherical cavity (35). The discharge end of the hopper (20) is connected with a seed inlet pipe (37) which is communicated with the spherical cavity (35) and is inclined.

3. The stir-frying device for hanging melon seeds according to claim 2, wherein: The first tapered pipe (34), the throat pipe (33), the second tapered pipe (32), and the discharge pipe (31) are all coaxially arranged. The seed inlet pipe (37) is located between the first tapered pipe (34) and the feed pipe (36). The included angle between the axial direction of the seed inlet pipe (37) and the axial direction of the first tapered pipe (34) is an acute angle. The included angle between the axial direction of the feed pipe (36) and the axial direction of the first tapered pipe (34) is an obtuse angle.

4. The stir-frying device for hanging melon seeds according to claim 1, wherein: A plurality of vibrating plates (21) are installed on the conical surface of the outer side wall of the hopper (20).

5. The stir-frying device for snakegourd seeds according to claim 3, wherein: The included angle between the axial direction of the seed inlet pipe (37) and the axial direction of the first tapered pipe (34) is γ, γ = 40°. The included angle between the axial direction of the feed pipe (36) and the axial direction of the seed inlet pipe (37) is β, β = 66°.

6. The stir-frying device for hanging melon seeds according to claim 2, wherein: The inner part of the feed pipe (36) is provided with a lining pipe (361). The inner wall of the lining pipe (361) is a tapered pipe cavity (362). The small end of the tapered pipe cavity (362) extends to the connection part of the feed pipe (36) and the spherical cavity (35).

7. The stir-frying device for hanging melon seeds according to claim 2, characterized in that: The feed pipe is externally connected to a dry ice spraying machine. The air pressure of the compressed air output by the dry ice spraying machine is 0.21 - 0.22 MPa, the dry ice spraying amount is 0.8 - 1.2 kg / min, and the particle size of the dry ice particles is less than or equal to 3 mm.

8. The stir-frying device for hanging melon seeds according to claim 2, characterized in that: The taper angle of the first tapered pipe (34) is 27 ± 3°, and the taper angle of the second tapered pipe (32) is 16 ± 3°.

9. The stir-frying device for snakegourd seeds according to claim 6, wherein: The taper angle of the tapered pipe cavity (362) is 33 ± 3°.

10. A method for stir-frying snakegourd seeds, characterized in that: Adopt a hanging melon seed frying device as described in any one of claims 1 - 9. The hanging melon seeds enter the dry ice sandblasting pipe through the hopper. The dry ice sandblasting pipe sprays the hanging melon seeds in the dry ice sandblasting pipe into the frying machine through compressed air in the form of sandblasting. When the hanging melon seeds in the frying machine reach the predetermined mass, the frying temperature in the frying machine rises to 50 ± 2 °C and fries for 1 - 2 min; then it rises to 70 ± 5 °C and fries for 8 - 10 min. Then, soup material is sprayed into the frying machine and the temperature is raised to 100 ± 2 °C for frying for 8 - 10 min. Finally, heat up to 155 ± 2 °C and stir-fry for 3 - 5 minutes to obtain snakegourd seeds.

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