Pine nut processing system and process for stir-frying pine nuts by using same

Abstract

The invention relates to the field of pine nut processing technologies, in particular to a pine nut processing system and a pine nut stir-frying technology using the same. The pine nut processing system comprises a pine nut type selection specific gravity machine, a pine nut particle size screening machine, a pine nut peel grinding machine, an oil pan, an oil separation device, a pine nut cooling device and a packaging machine. Pine nuts selected by the pine nut type selection specific gravity machine are fed into the pine nut particle size screening machine to be subjected to pine nut particle size grading screening. Feeding the pine nuts subjected to the pine nut particle size screening into a pine nut buffing machine for buffing treatment; the pine nuts subjected to peel grinding treatment are sent into a frying pan to be subjected to high-temperature frying treatment; the pine nuts subjected to high-temperature frying treatment are input into an oil separation device for oil separation; inputting the pine nuts subjected to oil separation into a pine nut cooling device for vacuum-pumping cooling treatment, and packaging the pine nuts subjected to vacuum-pumping cooling treatment by a packaging machine to obtain finished fried pine nuts. The pine nut processing system provided by the invention can efficiently produce fried pine nuts, and meanwhile, waste residues are developed and utilized.

Description

Technical Field

[0001] The present application relates to the field of pine nut processing technology, and in particular to a pine nut processing system and a roasted pine nut process produced by the system. Background Art

[0002] Pine nuts are rich in fat, protein, and carbohydrates, and have rich nutritional value. It is calculated that every 100 grams of pine nuts contain 15-17 grams of protein, 9.5-10.0 grams of carbohydrates, 60-65 grams of fat, and trace elements required by the human body, such as 78-80 mg of calcium, 23-240 mg of phosphorus, and 6.0-6.8 mg of iron. In addition, pine nuts have high dietary and medicinal value. Pine nuts are warm in nature and sweet in taste, and have dietary therapeutic effects such as nourishing yin, extinguishing wind, and moistening the lungs. The medicinal value is reflected in the fact that it can cure rheumatism, dizziness, dry cough, vomiting blood, constipation and other diseases. Therefore, with the development of the economy and the improvement of people's living standards, pine nut food has been favored by consumers.

[0003] From the pine cones picked from the pine trees to the fried pine nuts delivered to the consumers, multiple processing steps are required to obtain high-quality pine nut food. The pine nut processing technology in the prior art includes selecting pine nuts, pine nut grading, pine nut peeling, frying and opening, cooling, and packaging: the selection of pine nuts is specifically to manually select fresh pine nuts with bright color and large and uniform grains, and put them into a cleaning machine for cleaning. In view of the above-mentioned prior art, the inventor found that there are the following problems: the existing pine nut frying processing technology is time-consuming and labor-intensive, which affects the efficiency of the production of pine nut food. To this end, the inventor provides a pine nut processing system and a pine nut frying process produced using the system. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present application provides a pine nut processing system and a roasted pine nut process produced using the same, which can not only obtain high-quality roasted pine nuts, but also effectively improve the production efficiency of roasted pine nuts. In addition, the waste generated in the pine nut processing process is recycled and reused, which reduces the overall production cost, and also reduces industrial waste emissions, meeting the needs of green and environmental protection development.

[0005] The pine nut processing system provided in this application is realized by the following technical solutions: A pine nut processing system comprises a pine nut selection specific gravity machine, a pine nut particle size screening machine, a pine nut skinning machine, an oil pan, an oil separation device, a pine nut cooling device and a packaging machine. The pine nuts selected by the pine nut selection specific gravity machine are sent to the pine nut particle size screening machine for pine nut particle size classification and screening; the pine nuts screened by the pine nut particle size screening machine are sent to the pine nut skinning machine for skinning treatment; the pine nuts skinned by the pine nut skinning machine are sent to the oil pan for high-temperature frying; the pine nuts fried in the oil pan are input to the oil separation device for oil separation; the pine nuts separated by the oil separation device are input to the pine nut cooling device for vacuum cooling treatment; the pine nuts vacuum cooled by the pine nut cooling device are input to the packaging machine for packaging, so as to obtain high-quality fried pine nuts.

[0006] In the pine nut processing system provided by the present invention, a pine nut selection specific gravity machine is used to first select the pine nuts beaten out of the pine cones, and the pine nuts with full kernels are screened out, while the "bad nuts" and "empty nuts" are screened out. The particle sizes of the obtained pine nuts with full kernels are different, so the pine nuts with full kernels need to be input into a pine nut particle size screening machine for pine nut classification, and the A-grade large-particle-size pine nuts, B-grade medium-particle-size pine nuts, C-grade small-particle-size pine nuts, and D-grade micro-particle-size pine nuts are screened out. The D-grade micro-particle-size pine nuts are then input into a nut shell crusher to extract the kernels, and the kernels are further processed for use in making pine nut kernels or pine nut oil; the A-grade large-particle-size pine nuts, the B-grade medium-particle-size pine nuts, and the C-grade small-particle-size pine nuts are used as raw materials for roasting pine nuts and are respectively placed in a pine nut grinding machine for grinding treatment. The waste generated during the grinding process can be used as a raw material for cellulose ether production, and can also be used as a soil additive for potted plants, effectively improving resource utilization and reducing The invention can reduce the generation of industrial production waste, achieve the goal of energy conservation, emission reduction and green environmental protection production; the pine nuts that have been peeled are input into the oil pan for high-temperature frying and opening treatment, the pine nuts after warm frying and opening treatment are input into the oil separation device for oil separation, the pine nuts separated from the pine nuts are input into the pine nut cooling device for vacuum cooling treatment, and the separated oil can continue to be reused as food oil for the oil pan, the pine nuts that have been vacuum cooled are reduced from 75-90℃ at the time of input to 35-40℃ after 320-450s, and can be transported to the packaging machine for finished product packaging. The present invention can not only obtain high-quality fried pine nuts, but also effectively improve the production efficiency of fried pine nuts. In addition, the waste generated in the pine nut processing process is recycled and reused, which reduces the overall production cost, and also reduces industrial waste emissions, meets the needs of green environmental protection development, and enhances the competitiveness of enterprises.

[0007] Preferably, the pine nut selection gravity separator includes a coarse screening disk body and a fine screening disk body having the same structure as the coarse screening disk body. Ultrasonic vibrators are connected to both the coarse screening disk body and the fine screening disk body. The coarse screening disk body is connected to a raw pine nut conveying assembly. The four corners of the coarse screening disk body are marked as corner A, corner B, corner C, and corner D. Corner A is located at the upper left, corner B is located at the upper right, corner C is located at the lower left, and corner D is located at the lower right. The discharge port of the raw pine nut conveying assembly faces corner A of the coarse screening disk body. The height of corner A of the coarse screening disk body relative to the ground is D1. The height of corner B of the coarse screening disk body relative to the ground is D2, and D1 = D2. The height of corner C of the coarse screening disk body relative to the ground is D3, and D3 < D1. The height of corner D of the coarse screening disk body relative to the ground is D4, and D4 > D3. Two sorting bars A are welded to the lower bottom of the coarse screening disk body. The two sorting bars A divide the coarse screening disk body into three left waste outlets, a re-screening material outlet, and a coarse screening material outlet. A waste discharge pipe is fixedly connected to the coarse screening disk body. The waste pine nuts output from the left waste outlet are input into the waste discharge pipe and discharged from the coarse screening disk body. A re-screening material diversion pipe is fixedly connected to the coarse screening disk body. The re-screening pine nuts output from the re-screening material outlet are input into the re-screening material diversion pipe and flow to the feeding end of the raw pine nut conveying assembly. A coarse screening material diversion pipe is fixedly connected to the coarse screening disk body. The coarse screening material diversion pipe is communicated with a coarse screening pine nut conveying assembly. The coarse screening pine nuts output from the coarse screening material outlet are input into the coarse screening material diversion pipe and flow to the feeding end of the coarse screening pine nut conveying assembly. The discharge port of the coarse screening pine nut conveying assembly is located in the area between corner A and corner B of the fine screening disk body.

[0008] By adopting the above technical solution, under the vibration action of the ultrasonic vibrator and the gravity action, the raw pine nuts in the coarse screening disk body move towards corners C and D. The pine nuts flowing towards the coarse screening material outlet at corner D are the coarse screening pine nuts with plump kernels, while the pine nuts flowing towards the left waste outlet at corner C are the waste pine nuts, and the pine nuts flowing towards the re-screening material outlet between corners C and D are the re-screening pine nuts. The re-screening pine nuts are input into the coarse screening disk body for re-screening to select the coarse screening pine nuts. The pine nut selection gravity separator provided in the present invention can efficiently screen out the coarse screening pine nuts, effectively improve the utilization rate of pine nut resources, and reduce the production cost of fried pine nuts.

[0009] Preferably, two sorting strips B are welded to the lower bottom of the fine screening disc body, and the two sorting strips B divide the fine screening disc body into three left-side secondary material outlets, a circulating screening material outlet, and a finished product screening material outlet; the fine screening disc body is fixedly connected with a secondary material outlet pipe; the secondary material pine nuts output from the left secondary material outlet are input into the secondary material outlet pipe and output from the fine screening disc body; the fine screening disc body is fixedly connected with a circulating screening material conduit, and the circulating screening material pine nuts output from the circulating screening material outlet are input into the feed end of the circulating screening material conduit, and the discharge end of the circulating screening material conduit is connected with the feed end of the coarse screening pine nut transmission assembly; the fine screening disc body is fixedly connected with a finished product screening material outlet pipe; the finished product screening material outlet pipe is connected with the feed end of the pine nut particle size screening machine.

[0010] By adopting the above technical scheme, the coarse-screened pine nuts are input into the fine-screen disc, and the fine-screen disc moves toward the C angle and the D angle under the vibration of the ultrasonic vibrator and the action of gravity. The pine nuts flowing toward the finished product screening outlet in the direction of the D angle are fine-screened pine nut finished products with full kernels, while the pine nuts flowing toward the left side secondary material outlet in the direction of the C angle are secondary material pine nuts, and the pine nuts flowing toward the circulating screening outlet between the C angle and the D angle are re-screened pine nuts. The re-screened pine nuts are input into the fine-screen disc for screening again to select the fine-screened pine nut finished products. The pine nut selection specific gravity machine provided in the present invention can efficiently screen out the fine-screened pine nut finished products, effectively improve the utilization rate of pine nut resources, and reduce the production cost of roasted pine nuts.

[0011] Preferably, the pine nut particle size screening machine includes a finished product screening pine nut transmission component, a supporting body, a screening component, and a vibration component, the discharge end of the finished product screening material outlet pipe is connected to the feed end of the finished product screening material pine nut transmission component; the screening component includes three screening meshes that are detachably and fixedly connected to the supporting body and spaced from each other, the three screening meshes are marked as screening mesh A, screening mesh B, and screening mesh C, the aperture of the screening mesh A is larger than the aperture of the screening mesh B, which is larger than the aperture of the screening mesh C; the screening mesh is inclined at an angle of 5-10° to the horizontal plane; the discharge port of the finished product screening material pine nut transmission component is toward the end of the screening mesh plate that is higher relative to the ground, that is, the discharge port of the finished product screening material pine nut transmission component is toward the upper part of the screening mesh A; the bottom of the supporting body is detachably connected to a bottom collecting plate; the vibration component is fixedly connected to the bottom of the bottom collecting plate.

[0012] Preferably, the aperture of the screening mesh A is Amm, the aperture of the screening mesh B is Bmm, the aperture of the screening mesh C is Cmm, A>B>C; after the finished screening pine nuts input by the finished screening pine nut transmission assembly are vibrated and screened by the screening mesh A, the pine nuts with a particle size ≥Amm are retained on the upper surface of the screening mesh A, the pine nuts with a particle size less than Amm fall to the screening mesh B, the pine nuts with a particle size less than Amm but ≥Bmm are retained on the upper surface of the screening mesh B, the pine nuts with a particle size less than Bmm flow to the screening mesh C, the pine nuts with a particle size less than Bmm but ≥Cmm are retained on the upper surface of the screening mesh C, and the pine nuts with a particle size less than Cmm flow to the bottom collection plate.

[0013] The pine nut particle size screening machine provided in the present invention can sort out three finished pine nuts with different particle sizes and one inferior pine nut. The three finished pine nuts with different particle sizes are respectively marked as grade A large-particle pine nuts with a particle size greater than Amm, grade B medium-particle pine nuts with a particle size less than Amm and greater than Bmm, and grade C small-particle pine nuts with a particle size less than Bmm. The pine nuts are divided into three products with different prices according to their particle sizes, which can effectively improve the economic value of the pine nuts and is also convenient for the general public to choose. The inferior pine nuts are grade D flat-particle pine nuts with a particle size less than Cmm, which can be used to make pine nut kernels or pine nut oil, thereby improving the utilization rate of pine nut resources and reducing production costs.

[0014] Preferably, the raw pine nut transmission component, the coarse screening pine nut transmission component and the finished screening pine nut transmission component have the same structure. Taking the raw pine nut transmission component as an example, the raw pine nut transmission component includes a channel straight pipe, a bucket conveyor belt arranged in the channel straight pipe, a feed pipe A and a feed pipe B respectively fixedly connected to both sides of the lower part of the channel straight pipe, and a discharge pipe fixedly connected to the upper part of the channel straight pipe. The feed pipe A of the raw pine nut transmission component inputs raw pine nuts; the feed pipe B of the raw pine nut transmission component is connected to the re-screening pine nut transmission component. The discharge port of the material guide pipe is connected; the feed pipe A of the coarse screening pine nut transmission component is connected with the discharge port of the coarse screening material outlet; the feed pipe B of the coarse screening pine nut transmission component is connected with the discharge port of the circulating screening material outlet; the feed pipe A of the finished product screening pine nut transmission component is connected with the discharge port of the finished product screening material outlet pipe; the discharge port of the discharge pipe of the raw material pine nut transmission component faces the A corner of the coarse screening disc; the discharge port of the discharge pipe of the coarse screening pine nut transmission component faces the area between the A corner and the B corner of the fine screening disc.

[0015] Preferably, the discharge pipe of the finished screening pine nut transmission assembly is fixedly connected to a pine nut output pipe head; the upper surface of the pine nut output pipe head is integrally machined to form an input hole; the discharge end of the discharge pipe is fixedly connected to the pine nut output pipe head, so that the discharge pipe is connected to the input hole; the lower surface of the pine nut output pipe head is integrally machined to form a plurality of output holes; the output holes of the pine nut output pipe head are oriented toward an end of the screening net that is higher relative to the ground.

[0016] By adopting the above technical solution, coarse screening, fine screening and particle size screening processes can be completed efficiently, reducing the intensity of manual labor, improving the overall production efficiency of roasted pine nuts, and improving the company's production profits and market competitiveness.

[0017] Preferably, the oil separation device comprises a stainless steel cylinder, an oil separation cylinder that rotates and is fixedly connected to the stainless steel cylinder, a driving motor that is fixedly connected to the stainless steel cylinder and is used to drive the oil separation cylinder to rotate around its own axial direction, the stainless steel cylinder is formed with a jacket layer that plays a role in heat preservation; the stainless steel cylinder is integrally formed with an upper opening and a lower opening; the stainless steel cylinder is fixedly connected with a guide hopper that is connected to the upper opening; a fried pine nut feed port is formed on the upper surface of the oil separation cylinder; the fried pine nuts flow into the oil separation cylinder through the guide hopper, the upper opening and the fried pine nut feed port; a fried pine nut discharge port is provided at the center of the lower surface of the oil separation cylinder; an automatic discharge assembly is connected to the lower surface of the oil separation cylinder; when the oil separation cylinder rotates around its own axial direction driven by the driving motor to separate the oil, the automatic discharge assembly controls the fried pine nut discharge port of the oil separation cylinder to be in a closed state, and after the oil is separated, the automatic discharge assembly is opened, so that the fried pine nut discharge port is open for discharge.

[0018] The oil separation device provided by the present invention can quickly realize oil separation, improve the oil separation efficiency, and effectively remove the residual oil on the surface of pine nuts, improve the taste of pine nuts, and reduce the production cost of fried pine nuts.

[0019] Preferably, the pine nut cooling device includes a stainless steel kettle, a nitrogen gas input pipe, a condenser, a U-shaped tube, a buffer tank, a vacuum pump, and a condensed oil recovery tank. The bottom side wall of the stainless steel kettle is connected to the air inlet end of the nitrogen gas input pipe; the top of the stainless steel kettle is connected to the air inlet end with the condenser; the output end of the condenser is connected to the input end of the U-shaped tube; the output end of the U-shaped tube is connected to the buffer tank; the top of the buffer tank is connected to the exhaust end of the vacuum pump; and the bottom of the U-shaped tube is fixedly connected to the top feed pipe of the condensed oil recovery tank through a pipeline.

[0020] The pine nut cooling device of the present invention solves the oil fume pollution problem existing in the traditional cooling method, and can also recycle and reuse the oil fume, thereby reducing the overall production cost of frying pine nuts. The vacuum cooling has a better cooling effect on the pine nuts, shortens the post-cooling processing time, and improves the overall production efficiency.

[0021] A process for roasting pine nuts produced by a pine nut processing system comprises the following steps: Step 1: the raw pine nuts are input into a pine nut selection specific gravity machine, and the finished sieved pine nuts are obtained through coarse screening and fine screening; Step 2, the finished sieved pine nuts obtained in step 1 are input into a pine nut particle size screening machine to select A-grade large-size pine nuts, B-grade medium-size pine nuts, C-grade small-size pine nuts, and D-grade micro-size pine nuts; the particle size of A-grade large-size pine nuts is greater than Amm; the particle size of B-grade medium-size pine nuts is greater than Bmm and less than Amm; the particle size of C-grade small-size pine nuts is greater than Cmm and less than Bmm; the particle size of D-grade micro-size pine nuts is less than Cmm; Step 3, any one of the large-particle pine nuts of product A, medium-particle pine nuts of product B, and small-particle pine nuts of product C obtained in step 2 is input into a pine nut grinding machine for grinding, the pine nut grinding alkali solution is edible alkali with a concentration of 1.5±0.05wt%, and the pine nut grinding alkali solution is extracted from the pine nut grinding machine after soaking in the pine nut grinding alkali solution for 15-30min, and the pine nut grinding alkali solution is removed by rod grinding for 30-45min, and then filtered tap water is added to the pine nut grinding machine, and the water intake is sufficient to immerse the pine nut material, and after mixing evenly, citric acid is added to adjust the solution pH to 6.9-7.0, and the waste water is discharged, and the finished grinding pine nuts are obtained by rinsing once with filtered tap water; Step 4, the finished ground pine nuts in step 3 are only subjected to high-temperature frying in the oil pan, the frying temperature is 140-160° C., and the frying time is 280-360 seconds to obtain fried pine nuts; Step 5, the fried pine nuts obtained in step 4 are input into an oil separation device for oil separation treatment, the speed of the driving motor is 200-500rpm, and the duration is 5-10min; Step 6, the pine nuts separated from the oil obtained in step 5 are input into a pine nut cooling device for vacuum cooling treatment, the inner pressure of the stainless steel kettle is controlled to be 0.028-0.030MPa, the pulse air intake interval of the nitrogen gas input pipe is 1s, the pulse air intake duration is 0.5s, the pulse air intake of the nitrogen gas input pipe is 20°C nitrogen, the temperature of the fried pine nuts input into the stainless steel kettle is measured to be 80-90°C, and the temperature of the fried pine nuts is reduced to 30-40°C after vacuum treatment for 5-7min; Step seven, the fried pine nuts cooled to 30-40° C. after vacuum cooling in step six are input into a packaging machine for packaging to obtain bagged fried pine nuts or canned fried pine nuts.

[0022] The roasted pine nut processing technology provided by the present invention can industrially and efficiently produce high-quality roasted pine nuts, reduce the production cost of pine nuts, and improve corporate profits and market competitiveness. In addition, industrial production waste is recycled during the processing process, meeting green and environmentally friendly production requirements while improving overall resource utilization.

[0023] In summary, this application has the following advantages: 1. The present invention can efficiently and greenly produce high-quality fried pine nuts to meet consumers' healthy eating needs.

[0024] 2. The present invention recycles industrial waste during the processing process, meeting the requirements of green and environmentally friendly production while improving the overall resource utilization rate and the market competitiveness of the enterprise.

[0025] 3. The present invention solves the oil fume pollution problem existing in the traditional cooling method, and can also recycle and reuse the oil fume, thereby reducing the overall production cost of frying pine nuts. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the pine nut processing system in an embodiment of the present invention.

[0027] Figure 2 It is a structural schematic diagram of a specific gravity machine for pine nut selection in a pine nut processing system of the present invention.

[0028] Figure 3 It is a structural schematic diagram of a raw material pine nut transmission component in a pine nut processing system of the present invention.

[0029] Figure 4 The invention discloses a schematic structural diagram of a pine nut particle size screening machine in a pine nut processing system.

[0030] Figure 5 It is a structural schematic diagram of the oil separation device in the pine nut processing system of the present invention.

[0031] Figure 6 It is a top view of the oil separation cylinder in the pine nut processing system of the present invention.

[0032] Figure 7 It is a structural schematic diagram of the automatic discharging component in the pine nut processing system of the present invention.

[0033] Figure 8 It is a schematic diagram of the connection structure of a pine nut cooling device in the pine nut processing system of the present invention.

[0034] Fig. 9 It is a schematic diagram of the connection structure between the stainless steel kettle and the conveying screw in the pine nut processing system of the present invention.

[0035] In the figure, 1. Specific gravity machine for pine nut selection; 11. Coarse screen disc; 110. Sorting bar A; 111. Waste material outlet on the left; 112. Rescreening material outlet; 113. Coarse screen material outlet; 114. Waste material outlet pipe; 115. Rescreening material guide pipe; 116. Coarse screen material guide pipe; 12. Fine screen disc; 120. Sorting bar B; 121. Secondary material outlet on the left; 122. Circulating screen material outlet; 123. Finished product screen material outlet; 124. Secondary material outlet pipe; 125. Circulating screen material conduit; 126. Finished product screen material outlet pipe; 13. Raw material pine nut transmission component; 131. Channel straight pipe; 132. Bucket conveyor belt; 133. Feed pipe A; 13 4. Feed pipe B; 135. Discharge pipe; 14. Coarse pine nut transmission assembly; 2. Pine nut particle size screening machine; 21. Finished pine nut transmission assembly; 22. Support body; 23. Screening assembly; 230. Screening net; 24. Vibration assembly; 25. Bottom collecting plate; 26. Pine nut output pipe head; 261. Input hole; 262. Output hole; 3. Pine nut grinding machine; 4. Oil pan; 5. Oil separation device; 51. Stainless steel cylinder; 510. Support positioning ring; 5100. Ring groove; 511. Upper cylindrical cavity; 502. Lower cylindrical cavity; 503. Hopper inlet; 504. Hopper; 511. Upper opening; 512. Lower opening 52, oil separation cylinder; 520, fried pine nut feed port; 521, oil separation cylinder; 5211, oil penetration hole; 522, top connecting disc; 523, connecting rod; 524, reinforcing ring; 525, bottom ring; 5250, oil outflow; 5251, first slide; 5252, second slide; 526, limit large ring; 5260, limit small ring; 527, fried pine nut discharge port; 528, automatic discharge assembly; 5281, first electric push cylinder; 5282, first semicircular disc; 52821, first insert; 5283, second electric push cylinder; 5284, second semicircular disc; 52841, first Two embedded blocks; 53, driving motor; 54, guide hopper; 55, oil limit ring; 56, oil extraction pipe; 57, oil temporary storage area; 6, pine nut cooling device; 61, stainless steel kettle; 610, temperature detector; 611, motor; 612, conveying screw; 613, stainless steel casing; 6130, connecting steel bar; 6131, flow channel; 6132, pine nut outflow hole; 614, dispersion cap; 62, nitrogen gas input pipe; 621, pulse valve; 63, condenser; 64, U-tube; 65, buffer tank; 66, vacuum pump; 67, condensed oil recovery tank; 68, airflow dispersion plate; 681, airflow cavity; 682, airflow output hole. DETAILED DESCRIPTION

[0036] The present application is further described in detail below with reference to the accompanying drawings and embodiments. Example

[0037] Reference Figure 1, a pine nut processing system includes a specific gravity machine 1 for pine nut selection, a pine nut size screening machine 2, a pine nut skin grinding machine 3, an oil pan 4, an oil separation device 5, a pine nut cooling device 6 and a packaging machine.

[0038] Refer to Figure 1 , the frying operation of the pine nut processing system is introduced as follows: The specific gravity machine 1 for pine nut selection is used to select pine nuts with plump kernels. The selected pine nuts with plump kernels are input into the pine nut size screening machine 2 for pine nut size grading and screening, and the pine nuts with plump kernels are further divided into Grade A large-size pine nuts, Grade B medium-size pine nuts, Grade C small-size pine nuts, and Grade D micro-size pine nuts; Grade D micro-size pine nuts are used to make pine nut kernels or pine nut oil; The Grade A large-size pine nuts, Grade B medium-size pine nuts, and Grade C small-size pine nuts obtained after pine nut size screening in the pine nut size screening machine 2 are respectively input into the pine nut skin grinding machine 3 for skin grinding treatment; The pine nuts after skin grinding treatment by the pine nut skin grinding machine 3 are sent into the oil pan 4 for high-temperature frying treatment; The pine nuts after high-temperature frying treatment in the oil pan 4 are input into the oil separation device 5 for oil separation. The separated oil can be recycled, and the separated pine nuts are input into the pine nut cooling device 6 for vacuum cooling treatment; The pine nuts after vacuum cooling treatment by the pine nut cooling device 6 are input into the packaging machine for packaging to obtain the finished pine nut food.

[0039] Refer to Figure 1 , as the first step of production, the specific gravity machine 1 for pine nut selection is used to select pine nuts with plump kernels. The structure of the specific gravity machine 1 for pine nut selection is as follows. The specific gravity machine 1 for pine nut selection includes a coarse sieve disc body 11 and a fine sieve disc body 12 with the same structure as the coarse sieve disc body 11. Ultrasonic vibrators are connected to the bottom of the disc of both the coarse sieve disc body 11 and the fine sieve disc body 12. Under the vibration of the ultrasonic vibrators and the action of the self-gravity of the pine nuts, the raw pine nuts in the coarse sieve disc body are screened to separate waste materials, re-screened materials, and coarse-screened materials. The obtained coarse-screened pine nuts enter the fine sieve disc body 12 for fine screening, and then pine nuts with plump kernels can be obtained.

[0040] Refer to Figure 1 and Figure 2 , taking the coarse sieve disc body 11 as an example, the four corners of the coarse sieve disc body 11 are marked as Corner A, Corner B, Corner C, and Corner D. Corner A is located at the upper left, Corner B is located at the upper right, Corner C is located at the lower left, and Corner D is located at the lower right. The height of Corner A of the coarse sieve disc body 11 relative to the ground is D1, the height of Corner B of the coarse sieve disc body 11 relative to the ground is D2, D1 = D2, the height of Corner C of the coarse sieve disc body 11 relative to the ground is D3, D3 < D1, the height difference between D3 and D1 is 30 cm, and the length of the coarse sieve disc body 11 is 4 m. The height of Corner D of the coarse sieve disc body 11 relative to the ground is D4, D4 > D3, the height difference between D4 and D3 is 10 cm, and the width of the coarse sieve disc body 11 is 2 m.

[0041] Refer to Figure 1 and Figure 3The coarse screen disc 11 is connected to a raw material pine nut transmission assembly 13. The raw material pine nut transmission assembly 13 includes a channel straight pipe 131, a bucket conveyor belt 132, a feed pipe A133, a feed pipe B134, and a discharge pipe 135. The bottom of the channel straight pipe 131 is fixedly connected to the bottom surface, and the top of the channel straight pipe 131 is closed. The feed pipe A133 is fixedly connected to the lower peripheral side of the channel straight pipe 131, and the feed pipe B134 is fixedly connected to the other peripheral side of the lower part of the channel straight pipe 131. The discharge pipe 135 is fixedly connected to the upper peripheral side of the channel straight pipe 131. The bucket conveyor belt 132 is arranged inside the bucket conveyor belt 132, and the bucket conveyor belt 132 is composed of a conveyor belt and a hopper. The pine nuts inputted from the feed pipe B134 and the discharge pipe 135 fall into the hopper of the bucket conveyor 132, and are driven by the conveyor belt of the bucket conveyor 132 to move from bottom to top. After the hopper is flipped, the pine nuts fall into the discharge pipe 135, and the discharge port of the discharge pipe 135 in the raw material pine nut transmission assembly 13 faces the A corner of the coarse screen disc 11. The pine nuts outputted from the discharge pipe 135 fall into the coarse screen disc 11 for coarse screening.

[0042] Reference Figure 1 and Figure 2 Two sorting bars A110 are welded on the bottom of the coarse screen disc 11, and the two sorting bars A110 divide the coarse screen disc 11 into three left waste outlets 111, rescreen outlets 112, and coarse screen outlets 113. A waste outlet pipe 114 is fixedly connected to the lower periphery of the C corner of the coarse screen disc 11, and the waste pine nuts output from the left waste outlet 111 are input into the waste outlet pipe 114, and the waste pine nuts are output from the coarse screen disc 11 through the waste outlet pipe 114.

[0043] Reference Figure 1 and Figure 2 A re-screening guide pipe 115 is fixedly connected to the lower peripheral side of the coarse screen disc 11, and the feed pipe B134 of the raw pine nut transmission component 13 is connected to the discharge port of the re-screening guide pipe 115. The re-screening pine nuts output from the re-screening outlet 112 are input into the re-screening guide pipe 115 and flow to the feed end of the feed pipe B134 in the raw pine nut transmission component 13.

[0044] Reference Figure 1 and Figure 2 A coarse screen material flow guide pipe 116 is fixedly connected to the lower peripheral side of the D corner of the coarse screen disc body 11, and the coarse screen material flow guide pipe 116 is connected to the coarse screen pine nut transmission assembly 14. The structure of the coarse screen pine nut transmission assembly 14 is the same as that of the raw material pine nut transmission assembly 13, that is, the coarse screen pine nuts output by the coarse screen material outlet 113 are input into the coarse screen material flow guide pipe 116 and flow to the feed end of the feed pipe A133 in the coarse screen pine nut transmission assembly 14. The discharge port of the feed pipe A133 in the coarse screen pine nut transmission assembly 14 faces the area between the A corner and the B corner of the fine screen disc body 12.

[0045] Reference Figure 2 and Figure 3 The feed pipe A133 of the coarse screening pine nut transmission component 14 is connected with the discharge port of the coarse screening material outlet 113, and the coarse screening pine nuts output by the coarse screening disc 11 flow into the coarse screening material outlet 113 and enter the feed pipe A133 of the coarse screening pine nut transmission component 14, and flow to the bucket conveyor belt 132 of the coarse screening pine nut transmission component 14, and driven by the conveyor belt of the bucket conveyor belt 132, the pine nuts move from bottom to top, and after the hopper is flipped, the pine nuts fall into the discharge pipe 135 of the coarse screening pine nut transmission component 14, and the discharge port of the discharge pipe 135 in the coarse screening pine nut transmission component 14 faces the area between the A angle and the B angle of the fine screening disc 12, and the coarse screening pine nuts output by the discharge pipe 135 fall into the fine screening disc 12 for fine screening.

[0046] Reference Figure 2 and Figure 3 Two sorting strips B120 are welded on the bottom of the fine screening disc 12. The two sorting strips B120 divide the fine screening disc 12 into three left secondary material outlets 121, circulating screening outlets 122, and finished product screening outlets 123. A secondary material outlet pipe 124 is fixedly connected to the lower peripheral side of the fine screening disc 12. The secondary material pine nuts output from the left secondary material outlet 121 are input into the secondary material outlet pipe 124, and the secondary material pine nuts are led out of the fine screening disc 12. A circulating screening conduit 125 is fixedly connected to the lower peripheral side of the fine screening disc 12. The feed pipe B134 of the coarse screening pine nut transmission assembly 14 is connected to the discharge port of the circulating screening outlet 122 through the circulating screening conduit 125. The re-screened pine nuts flowing out of the circulating screening outlet 122 flow to the coarse screening pine nut transmission assembly 14 and the fine screening disc 12 in turn for multiple screening, and the pine nuts with full kernels are finely screened.

[0047] Reference Figure 2 and Figure 3 The lower circumference of the fine screening disc 12 is fixedly connected with a finished product screening material outlet pipe 126, which is connected to the finished product screening material outlet 123, and the finished product screening material outlet pipe 126 is connected to the pine nut particle size screening machine 2, and the fine screened pine nuts exported by the finished product screening material outlet pipe 126 are input into the pine nut particle size screening machine 2 for particle size classification and screening. The discharge pipe 135 of the finished product screening material pine nut transmission component 21 is fixedly connected with a pine nut output pipe head 26. The upper surface of the pine nut output pipe head 26 is integrally processed to form an input hole 261. The discharge end of the discharge pipe 135 is fixedly connected to the pine nut output pipe head 26, so that the discharge pipe 135 is connected to the input hole 261. The lower surface of the pine nut output pipe head 26 is integrally processed to form a plurality of output holes 262. The output hole 262 of the pine nut output pipe head 26 faces the end of the screening net 230 that is higher relative to the ground.

[0048] Reference Figure 1The pine nut particle size screening machine 2 includes a finished pine nut transmission component 21, a supporting body 22, a screening component 23, and a vibration component 24. The structure of the finished pine nut transmission component 21 is the same as that of the raw material pine nut transmission component 13. The discharge end of the finished pine nut outlet pipe 126 is connected to the feed end of the feed pipe B134 in the finished pine nut transmission component 21.

[0049] Reference Figure 1 and Figure 4 The screening assembly 23 includes three screening nets 230 that are detachably and fixedly connected to the supporting body 22 and spaced from each other. After the screening nets 230 are snapped into the slots on the supporting body 22, the slots on the supporting body 22 are sealed with U-shaped heads and bolts, so that the screening nets 230 are detachably and fixedly connected to the supporting body 22. The screening nets 230 are inclined at an angle of 5-10° to the horizontal plane, preferably at an angle of 8°.

[0050] Reference Figure 3 and Figure 4 The discharge end of the feed pipe B134 in the finished screened pine nut transmission component 21 faces the end of the screening net 230 that is higher than the ground, that is, the discharge end of the feed pipe B134 faces the upper part of the screening net A. The bottom of the support body 22 is detachably connected with a bottom collecting plate 25. After the bottom collecting plate 25 is clamped in the slot on the support body 22, the slot on the support body 22 is sealed with a U-shaped head and bolts, and then the bottom collecting plate 25 is detachably and fixedly connected to the support body 22. The vibration component 24 is an ultrasonic vibrator, which is fixedly connected to the bottom of the bottom collecting plate 25, and vibrates to select pine nuts of different particle sizes, that is, the finished screened pine nuts are input into the pine nut particle size screening machine 2 to select A-grade large-particle-size pine nuts, B-grade medium-particle-size pine nuts, C-grade small-particle-size pine nuts, and D-grade fine-particle-size pine nuts.

[0051] Reference Figure 4 , the three screening nets 230 are marked as screening net A, screening net B, and screening net C, and the aperture of screening net A> the aperture of screening net B> the aperture of screening net C. Specifically, the aperture of screening net A is Amm, the aperture of screening net B is Bmm, and the aperture of screening net C is Cmm, A>B>C. In the actual production line, the aperture of screening net A is 12mm, the aperture of screening net B is 8mm, and the aperture of screening net C is 4mm.

[0052] Reference Figure 4After the finished pine nuts input by the finished pine nut transmission component 21 are vibrated and screened by the screening net A, the pine nuts with a particle size ≥Amm are retained on the upper surface of the screening net A, the pine nuts with a particle size less than Amm fall to the screening net B, the pine nuts with a particle size less than Amm but ≥Bmm are retained on the upper surface of the screening net B, the pine nuts with a particle size less than Bmm flow to the screening net C, the pine nuts with a particle size less than Bmm but ≥Cmm are retained on the upper surface of the screening net C, and the pine nuts with a particle size less than Cmm flow to the bottom collection plate 25.

[0053] Reference Figure 1 The pine nut grinding machine 3 is a commercially available TX-pine nut grinding machine. The A-grade large-size pine nuts, B-grade medium-size pine nuts, and C-grade small-size pine nuts selected by the pine nut particle size screening machine 2 are respectively put into the TX-pine nut grinding machine for grinding treatment. The grinding waste residues generated during the grinding treatment are collected in a grinding waste collection tank, and 1.5-3wt% edible alkali lye is added for alkali reduction treatment for 2-4h. The waste residues are filtered and citric acid is used to neutralize the pH value. After filtering and drying, they can be used as raw materials for cellulose ether production, and can also be used as soil additives for potted plants, effectively improving resource utilization, reducing the generation of industrial production waste, and achieving the goals of energy conservation, emission reduction, and green environmental protection production.

[0054] Reference Figure 1 and Figure 5 The oil pan 4 is a conventional pine nut frying pan, and the pine nuts after the grinding process enter the oil pan 4 for high-temperature frying. The fried pine nuts are input into the oil separation device 5 for oil separation. The oil separation device 5 includes a stainless steel cylinder 51, an oil separation cylinder 52 that is rotatably and fixedly connected to the stainless steel cylinder 51, and a drive motor 53 that is fixedly connected to the top of the stainless steel cylinder 51 and is used to drive the oil separation cylinder 52 to rotate around its own axis. In order to perform heat preservation treatment on the separated oil, the stainless steel cylinder 51 is formed with a jacket layer 510 that plays a heat preservation role, and the jacket layer 510 can be filled with heat insulation cotton or can be vacuumized. The drive motor 53 is coaxially fixedly connected to a connecting shaft 530 through a coupling. One end of the connecting shaft 530 is coaxially fixedly connected to the output shaft of the drive motor 53 through a coupling, and the other end of the connecting shaft 530 is coaxially fixedly connected to the center of the upper surface of the oil separation cylinder 52, that is, the drive motor 53 can drive the oil separation cylinder 52 to rotate around its own axis to achieve centrifugal separation of oil.

[0055] Reference Figure 1 and Figure 5, the stainless steel cylinder 51 is integrally formed with an upper opening 511 and a lower opening 512. The upper opening 511 of the stainless steel cylinder 51 is 1.5-3 times the diameter of the lower opening 512. Preferably, the diameter of the upper opening 511 is 2.0 times the diameter of the lower opening 512. An upper cylindrical cavity 501 and a lower cylindrical cavity 502 are formed inside the stainless steel cylinder 51. The upper end opening of the upper cylindrical cavity 501 in the stainless steel cylinder 51 is the upper opening 511. The lower end opening of the upper cylindrical cavity 501 in the stainless steel cylinder 51 is the lower opening 512. The bottom side wall of the stainless steel cylinder 51 is provided with a hopper inlet 503 connected to the lower cylindrical cavity 502. The stainless steel cylinder 51 is embedded with a hopper 504, which is assembled in the stainless steel cylinder 51 from the hopper inlet 503. The pine nuts separated from the oil are input into the hopper 504, and the pine nuts loaded in the hopper 504 are sent to the pine nut cooling device 6 for cooling and post-processing.

[0056] Reference Figure 5 and Figure 6 The stainless steel cylinder 51 is fixedly connected with a guide hopper 54 connected with the upper opening 511. A fried pine nut feed port 520 is formed on the upper surface of the oil separation cylinder 52. The fried pine nuts flow into the fried pine nut feed port 520 of the oil separation cylinder 52 through the guide hopper 54, the upper opening 511, and the fried pine nut feed port 521.

[0057] Reference Figure 5 and Figure 6 The oil separation cylinder 52 includes an oil separation cylinder 521, a top connecting disc 522, a connecting rod 523, a reinforcing ring sheet 524, a bottom ring sheet 525, and a large limiting ring 526. The oil separation cylinder 521 is integrally formed with a plurality of oil penetration holes 5211, and the diameter of the oil penetration holes 5211 is 1.0-5.0 mm. The top connecting disc 522 is fixedly connected with a plurality of connecting rods 523. Preferably, the top connecting disc 522 is fixedly connected with four connecting rods 523, and adjacent connecting rods 523 form an angle of 90°. One end of a single connecting rod 523 is fixedly connected to the peripheral side of the top connecting disc 522, and the other end of the connecting rod 523 is fixedly connected to the top inner wall of the oil separation cylinder 521. The feed inlet of the oil separation cylinder 52 formed between adjacent connecting rods 523 guides the pine nuts to be separated from the oil in the stainless steel cylinder 51 through the guide hopper 54 and inputs them into the oil separation cylinder 52 through the feed inlet of the oil separation cylinder 52 .

[0058] Reference Figure 5 and Figure 6In order to improve the impact resistance of the connecting rod 523, a reinforcing ring sheet 524 is fixedly connected between adjacent connecting rods 523. The large limiting ring 526 is fixedly connected to the upper peripheral side of the oil separation cylinder 521, and the lower surface of the large limiting ring 526 is integrally formed with a small limiting ring 5260. The outer diameter of the large limiting ring 526 is 0.5-2mm smaller than the inner diameter of the stainless steel cylinder 51, and a gap is reserved between the outer wall of the large limiting ring 526 and the inner wall of the stainless steel cylinder 51 to avoid the friction between the two affecting the overall centrifugal separation efficiency. The inner wall of the stainless steel cylinder 51 is fixedly connected with a supporting positioning ring 510 that abuts against the lower surface of the large limiting ring 526. The inner diameter of the supporting positioning ring 510 is 0.5-2mm larger than the outer diameter of the oil separation cylinder 521, and a gap is reserved between the two to avoid the friction between the two affecting the overall centrifugal separation efficiency. The upper surface of the support and positioning ring 510 is machined to form an annular groove 5100, and the limiting small ring 5260 is embedded in the annular groove 5100 of the support and positioning ring 510. The limiting small ring 5260 is rotatably connected to the support and positioning ring 510, which can improve the stability of oil separation. The discharge port is integrally formed at the center of the bottom ring piece 525. The relative ground height of the discharge port of the bottom ring piece 525 is higher than the relative ground height of the connection between the bottom ring piece 525 and the oil separation cylinder 521. The lower surface of the bottom ring piece 525 is provided with a plurality of oil flow outlets 5250 near the connection with the oil separation cylinder 521, which can avoid the accumulation of oil in the oil separation cylinder 521 and improve the efficiency of oil recovery.

[0059] Reference Figure 5 and Figure 7 A fried pine nut discharge port 527 is provided at the center of the lower surface of the oil separation cylinder 52, and an automatic discharge assembly 528 is connected to the lower surface of the oil separation cylinder 52. When the oil separation cylinder 52 rotates around its own axis under the drive of the driving motor 53 to separate the oil, the automatic discharge assembly 528 controls the fried pine nut discharge port 527 of the oil separation cylinder 52 to be closed. After the oil is separated, the automatic discharge assembly 528 is opened, so that the fried pine nut discharge port 527 is open, and the pine nuts after the oil separation are discharged from the fried pine nut discharge port 527.

[0060] Reference Figure 5 and Figure 7 In order to reduce the collection loss of separated oil, a limiting oil ring 55 is fixedly connected to the bottom of the stainless steel cylinder 51, and the central axis of the oil limiting ring 55 coincides with the central axis of the lower opening 512 of the stainless steel cylinder 51. The inner diameter of the oil limiting ring 55 is equal to the diameter of the lower opening 512 of the stainless steel cylinder 51. The diameter of the lower opening 512 of the stainless steel cylinder 51 is equal to 0.2-0.4 times the inner diameter of the stainless steel cylinder 51, and the outer diameter of the oil limiting ring 55 is equal to 0.5-0.8 times the inner diameter of the stainless steel cylinder 51. Preferably, the diameter of the lower opening 512 of the stainless steel cylinder 51 is equal to 1 / 3 times the inner diameter of the stainless steel cylinder 51, and the outer diameter of the oil limiting ring 55 is equal to 0.60 times the inner diameter of the stainless steel cylinder 51.

[0061] Reference Figure 5 and Figure 6 The oil limiting ring 55 and the inner bottom surface and inner side wall of the stainless steel cylinder 51 form an oil temporary storage area 57. The bottom of the stainless steel cylinder 51 is fixedly connected with an oil extraction pipe 56. The oil extraction pipe opening of the oil extraction pipe 56 is located on the inner bottom surface of the stainless steel cylinder 51 and the vertical projection of the oil extraction pipe opening of the oil extraction pipe 56 is located in the oil temporary storage area 57. The oil extraction pipe 56 can be connected to a centrifugal pump, and the separated oil is input into a storage tank through the centrifugal pump, and the oil in the storage tank can be directly reused. The oil extraction pipe 56 can also be connected to a vacuum pump group (buffer tank + vacuum pump). Specifically, the oil extraction pipe 56 is connected to the buffer tank, and the buffer tank is connected to the vacuum pump. Through the vacuum pumping effect of the vacuum pump, the separated oil at the bottom of the stainless steel cylinder 51 is sucked into the buffer tank under the vacuum effect, and the oil in the buffer tank is extracted, which can be directly reused. The extraction efficiency is better than that of the centrifugal pump, and the engine oil of the centrifugal pump will not be introduced.

[0062] Reference Figure 5 and Figure 7 , the automatic discharging assembly 528 is fixedly connected to the lower surface of the bottom ring piece 525. The automatic discharging assembly 528 includes a first electric push cylinder 5281, a first semicircular disc 5282, a second electric push cylinder 5283, and a second semicircular disc 5284. The power sources of the first electric push cylinder 5281 and the second electric push cylinder 5283 are. The push rod of the first electric push cylinder 5281 is fixedly connected to the first semicircular disc 5282. The push rod of the second electric push cylinder 5283 is fixedly connected to the second semicircular disc 5284. The central axes of the push rod of the first electric push cylinder 5281 and the push rod of the second electric push cylinder 5283 coincide. Before the fried pine nuts to be separated from the oil are input, the first semicircular disc 5282 and the second semicircular disc 5284 form a disc under the counter-movement of the first electric push cylinder 5281 and the second electric push cylinder 5283, and the disc closes the discharge port of the oil separation cylinder 52. After the oil separation is completed, under the drive of the first electric push cylinder 5281 and the second electric push cylinder 5283, the disc that closes the discharge port of the oil separation cylinder 52 is separated into a first semi-circular disc 5282 and a second semi-circular disc 5284, and the discharge port is open. The fried pine nuts that have completed oil separation in the oil separation cylinder 52 fall into the hopper in the lower cylindrical cavity 502 of the stainless steel cylinder 51 through the discharge port. The pine nuts that have completed oil separation can be output from the stainless steel cylinder 51 by taking out the hopper.

[0063] Reference Figure 5 and Figure 7In order to improve the running stability of the automatic discharging assembly 528, the first semicircular disc 5282 and the second semicircular disc 5284 have the same structure, and the diameter of the first semicircular disc 5282 is 1.05-1.20 times the diameter of the discharge port of the oil separation cylinder 52, that is, the diameter of the second semicircular disc 5284 is 1.05-1.20 times the diameter of the discharge port of the oil separation cylinder. Preferably, the diameter of the first semicircular disc 5282 and the diameter of the second semicircular disc 5284 are both 1.1 times the diameter of the discharge port of the oil separation cylinder 52. The lower surface of the bottom ring plate 525 is provided with a first slide groove 5251 and a second slide groove 5252 with a T-shaped cross section. The length direction of the first slide groove 5251 and the second slide groove 5252 is consistent with the direction of the central axis of the push rod of the first electric push cylinder 5281. A first insert block 52821 with a T-shaped cross section is integrally formed on the upper surface of the first semicircular disc 5282. The first insert block 52821 is engaged in the first slide groove 5251 of the bottom ring piece 525, and the first insert block 52821 slides in the first slide groove 5251. A second insert block 52841 with a T-shaped cross section is integrally formed on the upper surface of the second semicircular disc 5284. The second insert block 52841 is engaged in the second slide groove 5252 of the bottom ring piece 525, and the second insert block 52841 slides in the second slide groove 5252.

[0064] Reference Figure 8 , the pine nuts after oil separation are input into the pine nut cooling device 6 for vacuum cooling treatment. The pine nut cooling device 6 includes a stainless steel kettle 61, a nitrogen gas input pipe 62, a condenser 63, a U-shaped tube 64, a buffer tank 65, a vacuum pump 66, and a condensed oil recovery tank 67. The bottom side wall of the stainless steel kettle 61 is sealed and hinged with a sealed hatch for discharging pine nuts after the cooling post-treatment is completed. The top of the stainless steel kettle 61 is sealed and hinged with a feed hatch. Among them, the bottom side wall of the stainless steel kettle 61 is connected to the air inlet end of the nitrogen gas input pipe 62, and a pulse valve 621 is fixedly connected to the nitrogen gas input pipe 62. The top of the stainless steel kettle 61 is connected to the air inlet end of the condenser 63 through a pipeline, and the output end of the condenser 63 is connected to the input end of the U-shaped tube 64 through a pipeline. The output end of the U-shaped tube 64 is connected to the buffer tank 65 through a pipeline. The top of the buffer tank 65 is connected to the exhaust end of the vacuum pump 66 through a pipeline. The bottom of the U-shaped tube 64 is fixedly connected to the top feed pipe of the condensed oil recovery tank 67 through a pipeline.

[0065] Reference Figure 8 and Fig. 9, the bottom of the stainless steel kettle 61 is fixedly connected with an airflow dispersion plate 68 connected to the gas input pipe 62, and the diameter of the airflow dispersion plate 68 is equal to the inner diameter of the stainless steel kettle 61. The airflow dispersion plate 68 is integrally processed to form an airflow cavity 681 connected to the gas input pipe 62. The upper surface of the airflow dispersion plate 68 is vertically provided with a plurality of airflow output holes 682 connected to the airflow cavity 81, and the central axis of the airflow output hole 682 is parallel to the central axis of the stainless steel kettle 61. The aperture requirement of the airflow output hole 682 in the airflow dispersion plate 68 must be smaller than the diameter of the pine nuts. The actual particle size of the A-grade pine nuts after screening is ≥10mm, and the particle size of the C-grade pine nuts is 4-6mm, so the aperture of the airflow output hole 682 is preferably controlled to be 1-3mm. The aperture of the airflow output hole 682 in the prototype is 2mm, and the processing and punching are relatively convenient, which can reduce the production cost of the post-processing system for roasting pine nuts. The sum of the aperture areas of all airflow output holes 682 is equal to 20-35% of the upper surface area of ​​the flow dispersion disk 68, that is, the opening rate of the upper surface of the flow dispersion disk 68 is 20-35%. The opening rate of the upper surface of the flow dispersion disk 68 in the prototype is 25%.

[0066] Reference Figure 8 and Fig. 9 The gas input into the stainless steel kettle 61 through the gas input pipe 62 is low-temperature 4N nitrogen. Using low-temperature 4N nitrogen as supplementary gas can ensure the quality of condensed and recovered oil. When the stainless steel kettle 61 is vacuuming and cooling the pine nuts, the pressure inside the kettle is preferably controlled at 0.02-0.04MPa. In the actual operation process, the pressure inside the kettle is controlled at 0.028-0.030MPa, which ensures good cooling post-processing efficiency and the taste of the fried pine nuts.

[0067] Reference Figure 8 and Fig. 9 , a motor 611 is fixedly connected to the top of the stainless steel kettle 61. The output shaft of the motor 611 is coaxially fixedly connected to a conveying screw 612 through a coupling, and the central axis of the conveying screw 612 coincides with the central axis of the stainless steel kettle 61. One end of the conveying screw 612 is coaxially fixedly connected to the output shaft of the motor 611, and the other end of the conveying screw 612 is sealed and penetrated through the top of the stainless steel kettle 61, extending to the bottom of the stainless steel kettle 61. A gap of 20-50mm is reserved between the bottom end face of the conveying screw 612 and the upper surface of the airflow dispersion disk 68 placed on the bottom surface of the stainless steel kettle 61, and the gap distance in the prototype is 40mm.

[0068] Reference Figure 8 and Fig. 9, a stainless steel sleeve 613 is fixedly connected inside the stainless steel kettle 61. The fixed connection method of the stainless steel sleeve 613 and the stainless steel kettle 61 is as follows: three connecting steel bars 6130 are fixedly connected to the top of the stainless steel sleeve 613, one end of the connecting steel bar 6130 is fixedly connected to the top of the stainless steel sleeve 613, and the other end is fixedly connected to the top surface of the stainless steel kettle 61, so that the stainless steel sleeve 613 is sleeved on the outside of the conveying screw 612. A flow channel 6131 for the pine nuts to flow is formed between the conveying screw 612 and the inside of the stainless steel sleeve 613. The gap of the flow channel 6131 is 20-35mm, and the gap distance in the prototype is 30mm. A 20-50mm gap is reserved on the upper surface of the airflow dispersion plate 68 placed between the bottom of the stainless steel sleeve 613 and the bottom surface of the stainless steel kettle 61, and the gap distance in the prototype is 45mm. The upper side wall of the stainless steel sleeve 613 is provided with a plurality of pine nut outflow holes 6132 with a diameter of 25-35 mm, and the diameter of the prototype is 30 mm.

[0069] Reference Figure 8 and Fig. 9 The middle outer wall of the stainless steel sleeve 613 is fixedly connected with a dispersion cap 614 having an inverted U-shaped cross section. The diameter of the dispersion cap 614 is equal to 0.8-0.95 times the inner diameter of the stainless steel kettle 61, and the gap between the side wall of the dispersion cap 614 and the inner wall of the stainless steel kettle 61 is larger than the pine nut particle size. The gap between the side wall of the dispersion cap 614 and the inner wall of the stainless steel kettle 61 is preferably controlled to be 30-50 mm, and the gap distance in the prototype is 40 mm.

[0070] Reference Figure 8 and Fig. 9 In order to facilitate real-time monitoring of the temperature of the pine nuts in the stainless steel kettle 61 , the stainless steel kettle 61 is fixedly connected with a temperature detector 610 . The sensing probe of the temperature detector 610 extends to the inner bottom of the stainless steel kettle 61 , and the display panel of the temperature detector 610 is fixedly connected to the outer wall of the stainless steel kettle 61 .

[0071] A process for roasting pine nuts produced by a pine nut processing system comprises the following steps: Step 1: the raw pine nuts are first input into the coarse screen disc 11 of the pine nut selection specific gravity machine 1 for coarse screening, and the coarse screened pine nuts are input into the fine screen disc 12 of the pine nut selection specific gravity machine 1 for fine screening, and the pine nuts flowing out of the finished screened material outlet 123 are the finished screened pine nuts; Step 2, the finished sieved pine nuts obtained in step 1 are input into the sieve assembly 23 of the pine nut particle size screening machine 2 through the finished sieved pine nut transmission assembly 21, and are selected into A-grade large-size pine nuts, B-grade medium-size pine nuts, C-grade small-size pine nuts, and D-grade fine-size pine nuts; the particle size of A-grade large-size pine nuts is greater than Amm; the particle size of B-grade medium-size pine nuts is greater than Bmm and less than Amm; the particle size of C-grade small-size pine nuts is greater than Cmm and less than Bmm; the particle size of D-grade fine-size pine nuts is less than Cmm; Step three, any one of the large-particle pine nuts of grade A, medium-particle pine nuts of grade B, and small-particle pine nuts of grade C obtained in step two is input into a pine nut skin grinding machine 3 for skin grinding treatment, the pine nuts are first input into the pine nut skin grinding machine 3 and soaked in an alkali solution for skin grinding (edible alkali with a concentration of 1.5±0.05wt%) for 15-30min, preferably, the soaking time is 30min, then the alkali solution for skin grinding of the pine nuts in the pine nut skin grinding machine 3 is extracted, the electrodes are turned on for rod grinding and peeling for 30-45min, preferably, the rod grinding and peeling time is 45min, and then filtered tap water is added into the pine nut skin grinding machine 3, the water intake is sufficient to immerse the pine nut material, citric acid is added after mixing evenly to adjust the pH value of the solution to 6.9-7.0, the waste water is discharged, and the filtered tap water is flushed into the pine nut skin grinding machine 3 to rinse the pine nuts that have completed the skin grinding treatment once, so as to obtain finished skin grinding pine nuts; Step 4, the finished ground pine nuts in step 3 are only subjected to high-temperature frying in the oil pan 4, the frying temperature is 140-160° C., the frying time is 280-360 seconds, preferably, the frying temperature is 150° C., the frying time is 300 seconds, and fried pine nuts can be obtained; Step five, the fried pine nuts obtained in step four are input into the oil separation device 5, specifically, the fried pine nuts flow to the fried pine nut feed port 520 of the oil separation cylinder 52 through the guide hopper 54, the upper opening 511, and the fried pine nut feed port 521, the fried pine nuts are loaded into the oil separation cylinder 52, the driving motor 53 is turned on, the driving motor 53 has a speed of 200-500rpm, and the rotation duration is 5-10min, preferably, the driving motor 53 has a speed of 360rpm, and the rotation duration is 8min, the pine nuts obtained by the oil separation of the oil separation device 5 will be input into the pine nut cooling device 6 in step six for vacuum cooling treatment, and the separated oil can be used as hot oil circulation; Step 6: The pine nuts separated from the oil obtained in step 5 are input into the pine nut cooling device 6 for vacuum cooling treatment. Specifically, the pulse valve 621 of the nitrogen gas input pipe 62 is first opened to introduce nitrogen into the stainless steel kettle 61. After exhausting the air in the stainless steel kettle 61, the feed hatch of the stainless steel kettle 61 is opened, and the pine nuts separated from the oil obtained in step 5 are input into the stainless steel kettle 61. The feed hatch of the stainless steel kettle 61 is closed, and then the pulse valve 621 is closed, and the vacuum pump 66 is turned on. The pressure in the stainless steel kettle 61 is evacuated to 0.0 28-0.030MPa, then open the pulse valve 621, the pulse intake interval of the nitrogen gas input pipe 62 is 1s, the pulse intake duration is 0.5s, the pulse intake of the nitrogen gas input pipe 62 is 20℃ nitrogen, the nitrogen input amount of the gas input pipe 62 is controlled to be equal to the vacuum pump 66 exhaust amount, the pressure in the kettle is maintained at 0.028-0.030MPa, the temperature of the fried pine nuts input into the stainless steel kettle 61 is measured to be 80-90℃, and the temperature of the fried pine nuts drops to 30-40℃ after 5-7min of vacuum treatment; In the actual production case, the temperature of the fried pine nuts input into the stainless steel kettle 61 is measured to be 86.7℃, and the temperature of the fried pine nuts inside the stainless steel kettle 61 can be grasped in real time through the display screen of the temperature detector 610. After 300s of vacuum treatment, the temperature of the fried pine nuts drops to 38.2℃, and the pine nuts after oil separation can be efficiently cooled; Step seven, the fried pine nuts cooled to 30-40° C. after vacuum cooling in step six are input into a packaging machine for packaging to obtain bagged fried pine nuts or canned fried pine nuts.

[0072] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pine nut processing system, characterized in that: It includes a specific gravity machine (1) for pine nut selection, a pine nut sizing and screening machine (2), a pine nut skin grinding machine (3), an oil pan (4), an oil and material separation device (5), a pine nut cooling device (6) and a packaging machine. The pine nuts selected by the specific gravity machine (1) for pine nut selection are sent into the pine nut sizing and screening machine (2) for pine nut sizing and grading screening; the pine nuts for pine nut sizing and screening in the pine nut sizing and screening machine (2) are sent into the pine nut skin grinding machine (3) for skin grinding treatment; the pine nuts after skin grinding treatment by the pine nut skin grinding machine (3) are sent into the oil pan (4) for high-temperature frying treatment; the pine nuts after high-temperature frying treatment in the oil pan (4) are input into the oil and material separation device (5) for oil and material separation; the pine nuts after oil and material separation by the oil and material separation device (5) are input into the pine nut cooling device (6) for vacuum cooling treatment; the pine nuts after vacuum cooling treatment by the pine nut cooling device (6) are input into the packaging machine for packaging.

2. A pine nut processing system according to claim 1, characterized in that: The specific gravity machine (1) for pine nut selection includes a coarse screening disc body (11) and a fine screening disc body (12) with the same structure as the coarse screening disc body (11). Ultrasonic vibrators are connected to both the coarse screening disc body (11) and the fine screening disc body (12). The coarse screening disc body (11) is connected with a raw pine nut transmission component (13); the four corners of the coarse screening disc body (11) are marked as corner A, corner B, corner C, and corner D. Corner A is located at the upper left, corner B is located at the upper right, corner C is located at the lower left, and corner D is located at the lower right; the discharge port of the raw pine nut transmission component (13) faces the corner A of the coarse screening disc body (11); the height of corner A of the coarse screening disc body (11) relative to the ground is D1; the height of corner B of the coarse screening disc body (11) relative to the ground is D2, and D1 = D2; the height of corner C of the coarse screening disc body (11) relative to the ground is D3, and D3 < D1; the height of corner D of the coarse screening disc body (11) relative to the ground is D4, and D4 > D3; two sorting bars A (110) are welded to the lower bottom of the coarse screening disc body (11), and the two sorting bars A (110) divide the coarse screening disc body (11) into three left waste material outlets (111), a re-screening material outlet (112), and a coarse screening material outlet (113); a waste material discharge pipe (114) is fixedly connected to the coarse screening disc body (11), and the waste pine nuts output from the left waste material outlet (111) are input into the waste material discharge pipe (114) to be discharged from the coarse screening disc body (11); a re-screening material diversion pipe (115) is fixedly connected to the coarse screening disc body (11); the re-screening pine nuts output from the re-screening material outlet (112) are input into the re-screening material diversion pipe (115) and flow to the feeding end of the raw pine nut transmission component (13); a coarse screening material diversion pipe (116) is fixedly connected to the coarse screening disc body (11); the coarse screening material diversion pipe (116) is communicated with a coarse screening pine nut transmission component (14); the coarse screening pine nuts output from the coarse screening material outlet (113) are input into the coarse screening material diversion pipe (116) and flow to the feeding end of the coarse screening pine nut transmission component (14); the discharge port of the coarse screening pine nut transmission component (14) is located in the area between corner A and corner B of the fine screening disc body (12).

3. A pine nut processing system according to claim 2, characterized in that: The lower bottom of the fine screening disc (12) is welded with two sorting bars B (120), and the two sorting bars B (120) divide the fine screening disc (12) into three left-side secondary material outlets (121), a circulating screening material outlet (122), and a finished product screening material outlet (123); the fine screening disc (12) is fixedly connected with a secondary material outlet pipe (124); the secondary pine nuts output from the left-side secondary material outlet (121) are input into the secondary material outlet pipe (124) and output from the fine screening disc (12); The fine screening disc (12) is fixedly connected to a circulating screening material conduit (125); the circulating screening material pine nuts outputted from the circulating screening material outlet (122) are inputted into the feed end of the circulating screening material conduit (125); the discharge end of the circulating screening material conduit (125) is communicated with the feed end of the coarse screening pine nut transmission assembly (14); the fine screening disc (12) is fixedly connected to a finished screening material outlet pipe (126); the finished screening material outlet pipe (126) is communicated with the feed end of the pine nut particle size screening machine (2).

4. A pine nut processing system according to claim 3, characterized in that: The pine nut particle size screening machine (2) comprises a finished pine nut transmission component (21), a support body (22), a screening component (23), and a vibration component (24); the discharge end of the finished pine nut outlet pipe (126) is connected to the feed end of the finished pine nut transmission component (21); the screening component (23) comprises three screening nets (230) which are detachably and fixedly connected to the support body (22) and spaced apart from each other; the three screening nets (230) are marked as screening net A, screening net B, and screening net C; the holes of the screening net A are The diameter of the pores of the sieve mesh (230) is larger than that of the sieve mesh B and larger than that of the sieve mesh C; the sieve mesh (230) is inclined at an angle of 5-10° to the horizontal plane; the discharge port of the finished sieve material pine nut transmission component (21) faces the end of the sieve mesh (230) that is higher than the ground, that is, the discharge port of the finished sieve material pine nut transmission component (21) faces the upper part of the sieve mesh A; the bottom of the support body (22) is detachably connected to a bottom collecting plate (25); and the vibration component (24) is fixedly connected to the bottom of the bottom collecting plate (25).

5. A pine nut processing system according to claim 4, characterized in that: The aperture of the screening mesh A is Amm, the aperture of the screening mesh B is Bmm, and the aperture of the screening mesh C is Cmm, A>B>C; after the finished screening pine nuts input by the finished screening pine nut transmission component (21) are vibrated and screened by the screening mesh A, pine nuts with a particle size ≥Amm are retained on the upper surface of the screening mesh A, pine nuts with a particle size less than Amm fall to the screening mesh B, pine nuts with a particle size less than Amm but ≥Bmm are retained on the upper surface of the screening mesh B, pine nuts with a particle size less than Bmm flow to the screening mesh C, pine nuts with a particle size less than Bmm but ≥Cmm are retained on the upper surface of the screening mesh C, and pine nuts with a particle size less than Cmm flow to the bottom collection plate (25).

6. A pine nut processing system according to claim 5, characterized in that: The raw material pine nut transmission component (13), the coarse screening pine nut transmission component (14) and the finished product screening pine nut transmission component (21) all have the same structure. Taking the raw material pine nut transmission component (13) as an example, the raw material pine nut transmission component (13) comprises a channel straight pipe (131), a bucket conveyor belt (132) arranged in the channel straight pipe (131), a feed pipe A (133) and a feed pipe B (134) respectively fixedly connected to both sides of the lower part of the channel straight pipe (131), and a discharge pipe (135) fixedly connected to the upper part of the channel straight pipe (131). The feed pipe A (133) of the raw material pine nut transmission component (13) inputs raw pine nuts; the feed pipe B (134) of the raw material pine nut transmission component (13) and the re-screening pine nut transmission component (21) are connected to the raw material pine nut transmission component (13) and the finished product screening pine nut transmission component (21) are connected to the raw material pine nut transmission component (13). The material guide pipe (115) is connected to the material outlet; the feed pipe A (133) of the coarse screening pine nut transmission component (14) is connected to the material outlet of the coarse screening material outlet (113); the feed pipe B (134) of the coarse screening pine nut transmission component (14) is connected to the material outlet of the circulating screening material outlet (122); the feed pipe A (133) of the finished product screening material pine nut transmission component (21) is connected to the material outlet of the finished product screening material outlet pipe (126); the material outlet of the discharge pipe (135) of the raw material pine nut transmission component (13) faces the corner A of the coarse screening disc (11); and the material outlet of the discharge pipe (135) of the coarse screening pine nut transmission component (14) faces the area between the corners A and B of the fine screening disc (12).

7. A pine nut processing system according to claim 6, characterized in that: The discharge pipe (135) of the finished screening material pine nut transmission component (21) is fixedly connected to a pine nut output pipe head (26); the upper surface of the pine nut output pipe head (26) is integrally machined to form an input hole (261); the discharge end of the discharge pipe (135) is fixedly connected to the pine nut output pipe head (26), so that the discharge pipe (135) and the input hole (261) are connected; the lower surface of the pine nut output pipe head (26) is integrally machined to form a plurality of output holes (262); the output holes (262) of the pine nut output pipe head (26) face the end of the screening net (230) that is higher than the ground.

8. The pine nut processing system according to claim 1, characterized in that: The oil separation device (5) comprises a stainless steel cylinder (51), an oil separation cylinder (52) rotatably and fixedly connected to the stainless steel cylinder (51), and a driving motor (53) fixedly connected to the stainless steel cylinder (51) and used for driving the oil separation cylinder (52) to rotate around its own axis; the stainless steel cylinder (51) is formed with a jacket layer (510) having a heat-insulating effect; the stainless steel cylinder (51) is integrally formed with an upper opening (511) and a lower opening (512); the stainless steel cylinder (51) is fixedly connected with a guide hopper (54) in communication with the upper opening (511); a fried pine nut feed port (520) is formed on the upper surface of the oil separation cylinder (52); The pine nuts flow into the oil separation cylinder (52) through the guide hopper (54), the upper opening (511), and the fried pine nut feed port (521); a fried pine nut discharge port (527) is provided at the center of the lower surface of the oil separation cylinder (52); an automatic discharge component (528) is connected to the lower surface of the oil separation cylinder (52); when the oil separation cylinder (52) is driven by the drive motor (53) to rotate around its own axis to separate oil, the automatic discharge component (528) controls the fried pine nut discharge port (527) of the oil separation cylinder (52) to be in a closed state; after the oil is separated, the automatic discharge component (528) is opened, so that the fried pine nut discharge port (527) is opened and the oil is discharged.

9. A pine nut processing system according to claim 1, characterized in that: The pine nut cooling device (6) comprises a stainless steel kettle (61), a nitrogen gas input pipe (62), a condenser (63), a U-shaped tube (64), a buffer tank (65), a vacuum pump (66), and a condensed oil recovery tank (67). The bottom side wall of the stainless steel kettle (1) is connected to the air inlet end of the nitrogen gas input pipe (62); the top of the stainless steel kettle (61) is connected to the air inlet end of the condenser (63); the output end of the condenser (63) is connected to the input end of the U-shaped tube (64); the output end of the U-shaped tube (64) is connected to the buffer tank (65); the top of the buffer tank (65) is connected to the air extraction end of the vacuum pump (66); and the bottom of the U-shaped tube (64) is fixedly connected to the top feed pipe of the condensed oil recovery tank (67) through a pipeline.

10. A process for roasting pine nuts produced by using the pine nut processing system according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1, the raw pine nuts are input into a pine nut selection specific gravity machine (1) and are subjected to coarse screening and fine screening to obtain finished sieved pine nuts; Step 2, the finished sieved pine nuts obtained in step 1 are input into a pine nut particle size screening machine (2) to select A-grade large-size pine nuts, B-grade medium-size pine nuts, C-grade small-size pine nuts, and D-grade fine-size pine nuts; the particle size of A-grade large-size pine nuts is greater than Amm; the particle size of B-grade medium-size pine nuts is greater than Bmm and less than Amm; the particle size of C-grade small-size pine nuts is greater than Cmm and less than Bmm; the particle size of D-grade fine-size pine nuts is less than Cmm; Step 3, any one of the large-particle pine nuts of grade A, medium-particle pine nuts of grade B, and small-particle pine nuts of grade C obtained in step 2 is input into a pine nut grinding machine (3) for grinding. The pine nuts are soaked in the alkali solution for grinding for 15-30 minutes, then the pine nuts are removed from the alkali solution for grinding in the pine nut grinding machine (3), and the pine nuts are peeled by grinding for 30-45 minutes. Then, filtered tap water is added to the pine nut grinding machine (3) so that the pine nuts are immersed in the water. After mixing evenly, citric acid is added to adjust the pH value of the solution to 6.9-7.0, the waste water is discharged, and the pine nuts are rinsed once with filtered tap water to obtain finished ground pine nuts; Step 4, the finished ground pine nuts in step 3 are only subjected to high temperature frying in the oil pan (4), the frying temperature is 140-160° C., and the frying time is 280-360 seconds to obtain fried pine nuts; Step 5, the fried pine nuts obtained in step 4 are input into an oil separation device (5) for oil separation treatment, the rotation speed of the driving motor (53) is 200-500 rpm, and the duration of the rotation is 5-10 minutes; Step 6, the pine nuts obtained after the oil separation in step 5 are input into the pine nut cooling device (6) for vacuum cooling treatment, the inner pressure of the stainless steel kettle (61) is controlled to be 0.028-0.030MPa, the pulse air intake interval of the nitrogen gas input pipe (62) is 1s, the pulse air intake duration is 0.5s, the pulse air intake of the nitrogen gas input pipe (62) is 20°C nitrogen, the temperature of the roasted pine nuts input into the stainless steel kettle (61) is measured to be 80-90°C, and after the vacuum treatment for 5-7min, the temperature of the roasted pine nuts is reduced to 30-40°C; Step seven, the fried pine nuts cooled to 30-40° C. after vacuum cooling in step six are input into a packaging machine for packaging to obtain bagged fried pine nuts or canned fried pine nuts.

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