Automatic low-temperature vacuum frying system

Abstract

The invention belongs to the technical field of food processing machinery, and particularly relates to an automatic low-temperature vacuum frying system which is characterized by comprising a frying bin assembly, a vacuum frying bin assembly, a vacuum frying bin assembly, a vacuum frying bin assembly, a vacuum frying bin assembly, a vacuum frying bin assembly, a vacuum frying bin assembly and a vacuum frying bin assembly, the feeding shield is fixedly connected to the side wall of the feeding shield, the lower end of the first feeding hopper and the lower end of the second feeding hopper are correspondingly connected with the first vacuum feeding bin and the second vacuum feeding bin, and the lower end of the first vacuum feeding bin and the lower end of the second vacuum feeding bin are jointly connected to the frying bin. A conveying part of the spiral conveying assembly extends into the frying bin; the deoiling bin assembly comprises a deoiling bin, and the deoiling bin is connected with the frying bin through a frying bin end plate. The whole process of oil body heating, constant temperature, raw material feeding, conveying, deep-frying, deoiling and discharging can be automatically operated, the product yield is greatly improved, and meanwhile labor force is greatly saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of food processing machinery, and particularly relates to an automated low-temperature vacuum frying system. Background Art

[0002] Vacuum frying technology is a food processing method that combines a vacuum environment and low-temperature frying, mainly used for producing products such as fruit and vegetable chips, meat snacks, etc. Compared with traditional frying, its core feature is to significantly reduce the oil temperature by reducing the ambient air pressure, thereby reducing the damage of high temperature to the nutritional components of food, and at the same time improving the taste and color of the product.

[0003] In a traditional vacuum frying system, it is impossible to achieve full-automatic operation from the processes of oil heating, constant temperature, raw material feeding, transmission, frying, oil removal, and discharging. This greatly limits the output of fried products, the stability of product frying cannot be maintained, and the frying cost is relatively high, making it unsuitable for large-scale industrial production. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art, and a kind of automated low-temperature vacuum frying system is proposed.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: An automated low-temperature vacuum frying system, characterized in that it includes: A frying chamber assembly, including a feeding shield, the lower side of the feeding shield is connected to a first feeding hopper and a second feeding hopper, the feeding shield is fixedly connected to the side wall of the feeding shield, the lower ends of the first feeding hopper and the second feeding hopper are correspondingly connected to a first vacuum feeding chamber and a second vacuum feeding chamber, and the lower ends of the first vacuum feeding chamber and the second vacuum feeding chamber are jointly connected to the frying chamber; A spiral transmission assembly, the conveying part of which extends into the frying chamber; An oil removal chamber assembly, including an oil removal chamber, the oil removal chamber is connected to the frying chamber through a frying chamber end plate, one end of the oil removal chamber is installed with an oil removal motor through a mounting flange, the oil removal motor is coaxially connected to a rotating shaft, the rotating shaft extends into the oil removal chamber and is installed with an oil removal basket, one side of the oil removal basket is connected with a receiving hopper, an unloading flap is arranged on the upper side of the receiving hopper, the unloading flap is movably connected with a turning cylinder, the receiving hopper is connected to a vacuum plate valve on the upper part of the discharging chamber, the vacuum plate valve on the upper part of the discharging chamber is connected to the discharging chamber below, the discharging chamber is connected to a vacuum plate valve below the discharging chamber, and the lower side of the oil removal chamber is connected to an oil return chamber.

[0006] An oil circuit assembly, including a loop A, a loop B, and a loop C.

[0007] Further, the A circuit is composed of a first main oil return pipe, a third centrifugal pump, a first double filter, a first secondary filter, a first main oil inlet pipe, a first heat exchanger, a first slag flushing pipe, and a first main spray pipe connected in sequence. The first main spray pipe is installed inside the frying bin.

[0008] Further, the B circuit includes a second main oil return pipe, a second centrifugal pump, a second double filter, a second secondary filter, a second heat exchanger, a second main oil inlet pipe, a second slag flushing pipe, a second main spray pipe, a fourth centrifugal pump, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, and an oil storage tank connected in sequence.

[0009] Further, the C circuit is composed of an oil return bin, a first centrifugal pump, and an oil return pipe.

[0010] Further, a filter screen and a material receiving hopper are also installed inside the frying bin, and the filter screen and the material receiving hopper are fixedly installed on the end plate of the frying bin.

[0011] Further, the screw conveyor assembly is composed of a screw conveyor motor, a gear, a toothed belt, a transmission shaft, and screw conveyor blades. The gear, the toothed belt, and the transmission shaft are connected to the frying bin and the end plate of the frying bin by bearings and oil seals.

[0012] Further, the deoiling basket is installed on the rotating shaft through a deoiling basket fixing member. The rotating shaft is connected to the rotating shaft support frame through a bearing. A scraping plate is fixed inside the deoiling basket.

[0013] Further, an outlet bin vacuum solenoid valve, an outlet bin vacuum gauge, and an outlet bin vacuum relief solenoid valve are installed on the outlet bin.

[0014] Further, an inlet steam pipe and an outlet steam pipe are connected to both the first heat exchanger and the second heat exchanger.

[0015] Further, a first oil return bin liquid level sensor is fixed on the top of the oil return bin, and a second oil return bin liquid level sensor is fixed on the bottom of the oil return bin.

[0016] The rotary slip assembly includes a slip body, a slip tooth plate, a slip tongue body, a slip side door, a slip oil cylinder, a slip piston rod, and a slip oil cylinder cover. The lower end of the slip body is fixedly connected to an upper connecting flange. The slip tooth plate, the slip tongue body, the slip side door, the slip oil cylinder, the slip piston rod, and the slip oil cylinder cover are all installed inside or on the surface of the slip body.

[0017] Compared with the existing technology, the advantages of this automated low-temperature vacuum frying system are as follows: In a vacuum environment, the entire process from the heating, constant temperature, raw material feeding, transmission, frying, defatting to discharging of the oil body can operate automatically, greatly improving the product output and significantly saving labor. Conducting the entire frying process in a vacuum environment greatly reduces the frying temperature, decreases the oil content of the product, and makes the product more environmentally friendly. The automatic temperature control of the system ensures the optimal frying temperature of the product. A frying filter basket is set in the frying chamber to timely filter and isolate fine product particles, ensuring the stability of the frying quality of the product. Set the transmission speed of the screw conveyor according to the frying and puffing time of different products, and set the alternating feeding frequency of the double-group feeding bin, as well as the defatting frequency and discharging frequency of the defatting bin according to the transmission speed of the screw conveyor, which can well adapt to industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the front view structural schematic diagram of an automated low-temperature vacuum frying system provided by the present invention; Figure 2 is the rear view structural schematic diagram of an automated low-temperature vacuum frying system provided by the present invention; Figure 3 is the top view structural schematic diagram of an automated low-temperature vacuum frying system provided by the present invention; Figure 4 is the longitudinal sectional schematic diagram of an automated low-temperature vacuum frying system provided by the present invention; Figure 5 is the internal structural schematic diagram of the defatting bin in an automated low-temperature vacuum frying system provided by the present invention; Figure 6 is Figure 5 the right view schematic diagram of; Figure 7 is the structural schematic diagram of the frying chamber in an automated low-temperature vacuum frying system provided by the present invention; Figure 8 is Figure 7 the bottom-up view in the direction of B-B of; Figure 9 is Figure 7 the bottom-up view in the direction of C-C of; Figure 10 is the oil circuit connection schematic diagram among the frying chamber assembly, defatting bin assembly and oil circuit assembly in an automated low-temperature vacuum frying system provided by the present invention.

[0019] In the figure, 1 is a feeding elevator; 2-1 is the first lower feeding vacuum plate valve; 2-2 is the second lower feeding vacuum plate valve; 3-1 is the first upper feeding vacuum plate valve; 3-2 is the second upper feeding vacuum plate valve; 4-1 is the vacuum gauge of the first feeding bin; 4-2 is the vacuum gauge of the second feeding bin; 5 is a feeding shield; 6-1 is the first vacuum feeding bin; 6-2 is the second vacuum feeding bin; 7-1 is the first feeding vacuum solenoid valve; 7-2 is the second feeding vacuum solenoid valve;; 8 is the vacuum gauge of the frying bin; 9-1 is the first liquid level sensor; 9-2 is the second liquid level sensor; 10 is the frying bin; 11 is a spiral conveying blade; 12 is a filter screen; 13 is an oil spraying pipe; 14 is an oil spraying nozzle; 15 is an electric contact vacuum gauge; 16 is the vacuum relief valve of the frying bin; 17 is a deoiling basket; 18 is a discharging flap; 19 is a deoiling bin; 20 is the discharging vacuum solenoid valve; 21 is the discharging vacuum solenoid valve; 22 is an oil return pipe; 23 is the first centrifugal pump; 24-1 is the first main oil return pipe; 24-2 is the second main oil return pipe; 25 is the second centrifugal pump; 26 is the slag discharging hopper observation window; 27 is the slag discharging hopper; 28 is the main oil inlet pipe; 29 is the third centrifugal pump; 30 is a slag flushing pipe; 31 is a temperature sensor; 32 is the fourth centrifugal pump; 33 is a spiral conveying motor; 34 is the total oil inlet and outlet solenoid valve; 35 is a transmission shaft; 36 is the total oil inlet and outlet pipe; 37 is a central control cabinet; 38 is a deoiling motor; 39 is a lighting lamp; 40 is an observation window; 41 is the main spray pipe; 42 is an external vacuum pipe; 43 is a spray pressure gauge; 44-1 is the vacuum relief valve of the first feeding bin; 44-2 is the vacuum relief valve of the second feeding bin; 45 is a material distributing cylinder; 46 is a material distributing cylinder; 47 is a steam pressure gauge; 48-1 is the first heat exchanger; 48-2 is the second heat exchanger; 49 is a secondary filter; 50 is a duplex filter; 51 is an oil return bin; 52 is the lower vacuum plate valve of the discharging bin; 53 is the discharging bin; 54 is the discharging vacuum relief valve; 55 is the upper vacuum valve of the discharging bin; 56 is a turning material cylinder; 57 is the end plate of the frying bin; 58 is a material distributing hopper; 59-1 is the first feeding hopper; 59-2 is the second feeding hopper; 60 is a receiving hopper; 61 is a liquid level observation window; 62 is an air valve; 63 is a liquid level sensor; 64 is the flange of the frying bin; 65 is a steam inlet pipe; 66 is a steam outlet pipe; 67 is the first solenoid valve; 68 is the second solenoid valve; 69 is the third solenoid valve; 70 is the deoiling basket sealing plate; 71 is a discharging detector; 72 is an aggregate hopper; 73 is the flange of the deoiling bin; 74 is the discharging bin vacuum relief solenoid valve; 75 is a rotating shaft support frame; 76-1 is the first hinge shaft; 76-2 is the second hinge shaft; 77 is a deoiling basket support frame; 78 is a hanging material plate; 79 is a rotating shaft; 80 is a deoiling basket fixing part; 81 is a motor mounting seat; 82 is a mounting flange; 83 is a liquid level sensor; 84 is a liquid level sensor; 85 is a frying bin support frame; 86 is the fourth solenoid valve. Detailed implementation manners

[0020] The following embodiments are only for illustrative purposes and are not intended to limit the scope of the present invention.

[0021] As Figures 1 - 10 shown, an automated low-temperature vacuum frying system includes a frying bin assembly, a spiral conveying assembly, a deoiling bin assembly, and an oil circuit assembly.

[0022] The frying bin assembly includes a feeding shield 5, a first feeding hopper 59-1, a second feeding hopper 59-2, a first vacuum feeding bin 6-1, a second vacuum feeding bin 6-2, a frying bin 10, a frying bin support frame 85, a first upper feeding vacuum plate valve 3-1, a second upper feeding vacuum plate valve 3-2, a first feeding bin vacuum solenoid valve 7-1, a first feeding bin vacuum gauge 4-1, a second feeding bin vacuum gauge 4-2, a first feeding bin vacuum solenoid valve 7-1, a second feeding bin vacuum solenoid valve 7-2, a first lower feeding vacuum plate valve 2-1, a second lower feeding vacuum plate valve 2-2, a distributing hopper 58, a distributing cylinder 45, an external vacuum tube 42, a frying bin vacuum gauge 8, an electric contact vacuum gauge 15, an oil temperature sensor 31, an oil level sensor 9, an observation window 40, a frying bin vacuum relief valve 16, a frying bin end plate 57, a receiving hopper 60, and a first hinge shaft 76-1. It internally houses a spiral conveying assembly, a filter screen 12, an oil inlet assembly, and a spraying assembly. All the components cooperate to complete the frying function of the product.

[0023] The first vacuum feeding bin 6-1 and the second vacuum feeding bin 6-2 are connected to the frying bin 10 by welding. Intermediate section welding flanges are used, which are connected to the first upper feeding vacuum plate valve 3-1 and the second upper feeding vacuum plate valve 3-2 above, and to the first lower feeding vacuum plate valve 2-1 and the second lower feeding vacuum plate valve 2-2 below. The first feeding hopper 59-1 and the second feeding hopper 59-2 are respectively connected to the first upper feeding vacuum plate valve 3-1 and the second upper feeding vacuum plate valve 3-2 through flanges. The feeding shield 5 is connected to the first feeding hopper 59-1 and the second feeding hopper 59-2. The distributing hopper 58 and the distributing cylinder 45 are connected to the feeding shield 5 by screws. The filter screen 12 is connected to the frying bin end plate 57 by screws. The receiving hopper 60 is connected to the frying bin end plate 57 by screws, and a sealing ring is provided between the frying bin end plate 57 and the frying bin 10 and they are connected by screws.

[0024] The spiral conveying assembly consists of a spiral conveying motor 33, gears, a toothed belt, a transmission shaft 35, and spiral conveying blades 11. The gears, the toothed belt, and the transmission shaft 35 are connected to the frying bin 10 and the frying bin end plate 57 using bearings, oil seals.

[0025] The oil separation bin assembly consists of an oil separation bin 19, an oil separation bin flange 73, a return oil bin 51, a first return oil bin liquid level sensor 83, a second return oil bin liquid level sensor 84, an oil separation basket 17, an oil separation basket fixing part 80, a mounting flange 82, a motor mounting seat 81, an oil separation motor 38, a rotating shaft support frame 75, an oil separation basket sealing plate 70, a lighting lamp 39, a second hinge shaft 76-2, an oil separation basket support frame 77, a scraping plate 78, a discharging flap 18, a turning cylinder 56, a receiving hopper 72, a rotating shaft 79, a discharging bin vacuum solenoid valve 20, an upper vacuum plate valve 55 of the discharging bin, a lower vacuum plate valve 52 of the discharging bin, a discharging bin 53, a discharging bin vacuum gauge 21, a discharging bin vacuum solenoid valve 20, a discharging bin vacuum relief solenoid valve 74, and a discharging detector 71.

[0026] In the oil separation bin assembly, the components welded to the oil separation bin 19 are: an oil separation bin flange 73, a lighting lamp 39, a mounting flange 82, a receiving hopper 72, a return oil bin 51, and a second hinge shaft 76-2. The first return oil bin liquid level sensor 83 is fixed at the top position of the return oil bin 51, and the second return oil bin liquid level sensor 84 is fixed at the bottom position of the return oil bin 51. A sealing ring is arranged between the oil separation bin flange 73 and the frying bin end plate 57, and they are connected by screws. The oil separation basket sealing plate 70 is fixed on the rotating shaft support frame 75. The oil separation basket 17 is installed on the rotating shaft 79 through the oil separation basket fixing part 80. The rotating shaft 79 is connected to the rotating shaft support frame 75 through bearings. The scraping plate 78 is fixed inside the oil separation basket 17. The discharging flap 18 is connected to the collecting hopper 72 through a hinge. The support rod of the turning cylinder 56 is movably connected to the discharging flap 18. The motor mounting seat 81 is connected to the mounting flange 82 by screws, and the oil separation motor 38 is connected to the motor mounting seat 81 by screws. The upper vacuum plate valve 55 of the discharging bin is connected to the receiving hopper 72 by screws. The discharging bin 53 is connected to the upper vacuum plate valve 55 of the discharging bin by screws. The lower vacuum plate valve 52 of the discharging bin is connected to the discharging bin 53 by screws. The discharging detector 71 is fixed on the lower vacuum plate valve 52 of the discharging bin. The discharging bin vacuum solenoid valve 20, the discharging bin vacuum gauge 21, and the discharging bin vacuum relief solenoid valve 74 are all fixedly installed on the discharging bin 53.

[0027] The oil circuit assembly consists of an A circuit, a B circuit, and a C circuit. The A circuit consists of a first main return oil pipe 24-1, a third centrifugal pump 29, a first double filter 50-1, a first secondary filter 49-1, a first main inlet oil pipe 28-1, a first heat exchanger 48-1, a first slag flushing pipe 30-1, and a first main spray pipe 41-1. The layout diagram of the first main inlet oil pipe 28-1 in the frying bin can be seen in Figure Seven Section C-C, and the layout diagram of the first main spray pipe 41-1 in the frying bin can be seen in Figure Seven Section B-B. The B oil circuit consists of a second main oil return pipe 24-2, a second centrifugal pump 25, a second double filter 50-2, a second secondary filter 49-2, a second heat exchanger 48-2, a second main oil inlet pipe 28-2, a second slag flushing pipe 30-2, a second main spray pipe 41-2, a fourth centrifugal pump 32, a first solenoid valve 67, a second solenoid valve 68, a third solenoid valve 69, a fourth solenoid valve 86, and an oil storage tank 46. The layout diagram of the second main oil inlet pipe 28-2 in the frying bin can be seen in Figure Seven section C-C, and the layout diagram of the spray pipe 13 in the frying bin can be seen in Figure Seven section B-B. The C oil circuit consists of an oil return bin 51, a first centrifugal pump 23, and an oil return pipe 22; Before the system starts production operations, the oil needs to be pumped from the oil storage tank 46 into the frying bin 10, and the oil circuit direction is: oil storage tank 46 → third solenoid valve 69 → fourth centrifugal pump 32 → second solenoid valve 68 → second main oil inlet pipe 28-2, second slag flushing pipe 30-2, second main spray pipe 41-2 → frying bin 10; After the system stops production operations, the oil needs to be pumped from the frying bin 10 into the oil storage tank 46, and the oil circuit direction is: second main oil return pipe 24-2, second centrifugal pump 25, second double filter 50-2, second secondary filter 49-2, second heat exchanger 48-2, second main oil inlet pipe 28-2, second slag flushing pipe 30-2 → fourth solenoid valve 86 → fourth centrifugal pump 32 → first solenoid valve 67 → oil storage tank 46.

[0028] The usage method and functions of the present invention are as follows: 1. Oil injection principle First, open the third solenoid valve 69 and the second solenoid valve 68, and start the fourth centrifugal pump. The oil enters the frying bin 10 through the second main oil inlet pipe 28-2, the second slag flushing pipe 30-2, and the second main spray pipe 41-2. When the oil level rises to the second liquid level sensor 9-2, the second centrifugal pump 25 and the third centrifugal pump 29 are started, so that the oil circuits B and A are filled with oil. At the same time, the oil is heated through the first heat exchanger 48-1 and the second heat exchanger 48-2. The first heat exchanger 48-1 and the second heat exchanger 48-2 are both connected with a steam inlet pipe 65 and a steam outlet pipe 66. When the oil level rises to the first liquid level sensor 9-1, the fourth centrifugal pump stops, and at the same time, the third solenoid valve 69 and the second solenoid valve 68 are closed.

[0029] 2. Transmission and feeding principle Start the operation. When the oil temperature reaches the set temperature, close the first feeding vacuum bottom plate valve 2-1, the second feeding vacuum bottom plate valve 2-2, and the discharging vacuum bottom plate valve 52, and start the distributing cylinder 45 to place the discharging port of the distributing hopper 58 at the first feeding hopper 59-1. At the beginning, the first feeding vacuum top plate valve 3-1 and the second feeding vacuum top plate valve 3-2 are in the open state. The raw materials are delivered to the first feeding hopper 59-1 through the feeding elevator 1 and enter the first vacuum feeding bin 6-1. When the amount of raw materials entering reaches the set amount (such as 3 Kg), start the distributing cylinder 45 to place the discharging port of the distributing hopper 58 at the second feeding hopper 59-2, and the raw materials enter the second vacuum feeding bin 6-2. When the amount of raw materials entering reaches the set amount (such as 3 Kg), close the first feeding vacuum top plate valve 3-1 and the second feeding vacuum top plate valve 3-2, start the distributing cylinder 45 to place the discharging port of the distributing hopper 58 at the first feeding hopper 59-1, and store the raw materials for the next batch entering the first vacuum feeding bin 6-1 in the first feeding hopper 59-1. When the amount of raw materials entering the first feeding hopper 59-1 reaches the set amount (such as 3 Kg), start the distributing cylinder 45 to place the discharging port of the distributing hopper 58 at the second feeding hopper 59-2, and store the raw materials for the next batch entering the second vacuum feeding bin 6-2 in the second feeding hopper 59-2. When the amount of raw materials stored in the second feeding hopper 59-2 reaches the set amount (such as 3 Kg), start the distributing cylinder 45 to place the discharging port of the distributing hopper 58 at the first feeding hopper 59-1 again, and store the raw materials for the next batch entering the first vacuum feeding bin 6-1 in the first feeding hopper 59-1. The distributing cylinder 45 operates alternately in this way, so that the raw materials enter the first feeding hopper 59-1 and the second feeding hopper 59-2 alternately according to the set amount (such as 3 Kg), thereby achieving the purpose of alternating and continuous feeding.

[0030] After the first feeding vacuum top plate valve 3-1 and the second feeding vacuum top plate valve 3-2 are closed, start the external vacuum system, the first feeding bin vacuum solenoid valve 7-1, and the second feeding bin vacuum solenoid valve 7-2 to make the inside of the first vacuum feeding bin 6-1, the second vacuum feeding bin 6-2, and the frying bin 10 in a vacuum state. Start the screw conveyor motor 33, open the first feeding vacuum bottom plate valve 2-1, and the raw materials in the first vacuum feeding bin 6-1 enter the frying bin 10, and then close the first feeding vacuum bottom plate valve 2-1. Start the first feeding bin vacuum relief valve 44-1, and after the inside of the first vacuum feeding bin 6-1 is at normal pressure, open the first feeding vacuum top plate valve 3-1, and the raw materials previously stored in the first feeding hopper 59-1 enter the first vacuum feeding bin 6-1. Subsequently, close the first feeding vacuum top plate valve 3-1 and wait for the next batch of feeding. While the raw materials entering the frying bin 10 start frying, they are pushed backward along with the screw conveyor blade 11. According to the frying and puffing time of different fruit and vegetable raw materials, set the rotation speed of the screw conveyor motor 33 and set the feeding amount for a single batch. After the feeding amount for a single batch is determined, it is achieved through the running time of the elevator 1.

[0031] When the raw materials of the first batch enter the frying chamber 10 through the first vacuum feeding bin 6-1, while being fried and puffed, they are conveyed to the end plate 57 of the bottom frying chamber, and then continue to be conveyed to the deoiling chamber 19 through the receiving hopper 60 (this time interval will vary depending on the types of fruits and vegetables and the puffing time, and needs to be verified through actual operation, such as 150 seconds). Open the second feeding vacuum bottom plate valve 2-2, and the raw materials in the second vacuum feeding bin 6-2 enter the frying chamber 10. Then close the second feeding vacuum bottom plate valve 2-2, start the second feeding bin vacuum relief valve 44-2 to make the feeding bin 6-2 in an atmospheric pressure state. Open the second feeding vacuum top plate valve 3-2, and the raw materials previously stored in the second feeding hopper 59-2 enter the second vacuum feeding bin 6-2. Subsequently, close the second feeding vacuum top plate valve 3-2. At this time, the discharge port of the distribution hopper 58 is placed at the second feeding hopper 59-2, and start the elevator 1 to store the raw materials of the next batch entering the second vacuum feeding bin 6-2 in the second feeding hopper 59-2. When the amount of raw materials stored in the second feeding hopper 59-2 reaches the set amount (such as 3 Kg), the elevator 1 stops running, and start the distribution cylinder 45 to make the discharge port of the distribution hopper 58 be placed at the first feeding hopper 59-1 again.

[0032] When the raw materials of the second batch enter the frying chamber 10 through the second vacuum feeding bin 6-2, while being fried and puffed, they are conveyed to the end plate 57 of the bottom frying chamber, and then continue to be conveyed to the deoiling chamber 19 through the receiving hopper 60 (this time interval will vary depending on the types of fruits and vegetables and the puffing time, and needs to be verified through actual operation, such as 150 seconds). Open the first feeding vacuum bottom plate valve 2-1, and the raw materials in the first vacuum feeding bin 6-1 enter the frying chamber 10. Then close the first feeding vacuum bottom plate valve 2-1, start the first feeding bin vacuum relief valve 44-1 to make the feeding bin 6-1 in an atmospheric pressure state. Open the first feeding vacuum top plate valve 3-1, and the raw materials previously stored in the first feeding hopper 59-1 enter the first vacuum feeding bin 6-1. Subsequently, close the first feeding vacuum top plate valve 3-1. At this time, the discharge port of the distribution hopper 58 is placed at the first feeding hopper 59-1, and start the elevator 1 to store the raw materials of the next batch entering the first vacuum feeding bin 6-1 in the first feeding hopper 59-1. When the amount of raw materials stored in the first feeding hopper 59-1 reaches the set amount (such as 3 Kg), the elevator 1 stops running, and start the distribution cylinder 45 to make the discharge port of the distribution hopper 58 be placed at the second feeding hopper 59-2 again. Run alternately in this way (the elevator 1 and the distribution hopper 58) 3. Principle of deoiling and discharging When the fried and puffed product reaches the oil removal bin 51 via the material receiving hopper 60, the oil removal motor 38 starts to run for centrifugal oil removal. Due to the spiral transmission, there will be a period of time (the data for this period needs to be obtained through actual operation, such as 120 seconds) from the feeding of each batch into the frying bin 10 to reaching the end plate 57 of the frying bin and then until all the products of this batch pass through the material receiving hopper 60. After this period of time, the products of this batch reach the oil removal basket 17. At this time, the oil removal motor 38 starts, and the turning cylinder 56 starts, causing the discharge flap 18 to open. During this process, the products are scraped and turned by the scraping plate 78, and under the blocking effect of the discharge flap 18, the products start to enter the collecting hopper 72. Then the turning cylinder 56 is started again to close the discharge flap 18, then open it, then close it... Such cyclic actions enable all the products to smoothly enter the collecting hopper 72, pass through the vacuum plate valve 55 on the discharge bin, and enter the discharge bin 53 (during the previous operation process, the vacuum plate valve 55 on the discharge bin has been in the open state, and the discharge bin 53 is in a vacuum state). After the products enter the discharge bin 53, the vacuum plate valve 55 on the discharge bin is closed, and the vacuum relief valve 54 of the discharge bin is started to make the discharge bin 53 at normal pressure, and the vacuum plate valve 52 under the discharge bin is opened for discharging. When the discharge detector detects that the discharging is completed, the vacuum plate valve 52 under the discharge bin is closed, and the vacuum solenoid valve 20 of the discharge bin is started to make the discharge bin 53 in a vacuum state, and then the vacuum plate valve 55 on the discharge bin is opened to restore the vacuum plate valve 55 on the discharge bin to its previous state.

[0033] During the oil removal process of the products, the oil brought by the products through the material receiving hopper 60 and the oil centrifugally removed accumulate in the oil return bin 51. The oil return bin 51 is connected to the first centrifugal pump 23. When the oil in the oil return bin 51 accumulates and the oil level reaches the first oil return bin liquid level sensor 83, the first centrifugal pump 23 starts to pump the oil back to the frying bin 10 via the oil return pipe 22; when the oil level drops to the second oil return bin liquid level sensor 84, the first centrifugal pump 23 stops.

[0034] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automated low-temperature vacuum frying system, characterized in that, Comprising: A frying bin assembly, including a feeding shield, the lower side of the feeding shield is connected to a first feeding hopper and a second feeding hopper, the feeding shield is fixedly connected to the side wall of the feeding shield, the lower ends of the first feeding hopper and the second feeding hopper are correspondingly connected to a first vacuum feeding bin and a second vacuum feeding bin, and the lower ends of the first vacuum feeding bin and the second vacuum feeding bin are jointly connected to the frying bin; A spiral conveying assembly, and the conveying part thereof extends into the frying bin; An oil-removing bin assembly, including an oil-removing bin, the oil-removing bin is connected to the frying bin through a frying bin end plate, an oil-removing motor is installed at one end of the oil-removing bin through a mounting flange, the oil-removing motor is coaxially connected to a rotating shaft, the rotating shaft extends into the oil-removing bin and is installed with an oil-removing basket, one side of the oil-removing basket is connected with a material receiving hopper, a discharge flap is arranged on the upper side of the material receiving hopper, the material flap is movably connected with a turning cylinder, the material receiving hopper is connected with a vacuum plate valve on the upper part of the discharge bin, the lower part of the vacuum plate valve on the upper part of the discharge bin is connected to the discharge bin, the lower part of the discharge bin is connected to a vacuum plate valve under the discharge bin, and the lower side of the oil-removing bin is connected to an oil return bin; An oil circuit assembly, including a circuit A, a circuit B and a circuit C.

2. The automated low-temperature vacuum frying system according to claim 1, wherein The circuit A is composed of a first main return oil pipe, a third centrifugal pump, a first double filter, a first secondary filter, a first main inlet oil pipe, a first heat exchanger, a first slag flushing pipe and a first main spray pipe connected in sequence, and the first main spray pipe is installed in the frying bin.

3. The automated low-temperature vacuum frying system according to claim 1, wherein, The circuit B includes a second main return oil pipe, a second centrifugal pump, a second double filter, a second secondary filter, a second heat exchanger, a second main inlet oil pipe, a second slag flushing pipe, a second main spray pipe, a fourth centrifugal pump, a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve and an oil storage tank connected in sequence.

4. The automated low-temperature vacuum frying system according to claim 1, wherein, The circuit C is composed of an oil return bin, a first centrifugal pump and a return oil pipe.

5. The automated low-temperature vacuum frying system according to claim 1, characterized in that A filter screen and a material receiving hopper are also installed in the frying bin, and the filter screen and the material receiving hopper are fixedly installed on the frying bin end plate.

6. The automated low-temperature vacuum frying system according to claim 1, wherein, The spiral conveying assembly is composed of a spiral conveying motor, a gear, a toothed belt, a transmission shaft and spiral conveying blades, and the gear, the toothed belt and the transmission shaft are connected to the frying bin and the frying bin end plate by bearings and oil seals.

7. The automated low-temperature vacuum frying system according to claim 1, wherein, The oil-removing basket is installed on the rotating shaft through an oil-removing basket fixing piece, the rotating shaft is connected to a rotating shaft support frame through a bearing, and a scraping plate is fixed in the oil-removing basket.

8. The automated low-temperature vacuum frying system according to claim 1, characterized in that A discharge bin vacuum solenoid valve, a discharge bin vacuum gauge and a discharge bin vacuum relief solenoid valve are installed on the discharge bin.

9. The automated low-temperature vacuum frying system according to claim 1, characterized in that, Steam inlet pipes and steam outlet pipes are connected to both the first heat exchanger and the second heat exchanger.

10. The automated low-temperature vacuum frying system according to claim 1, characterized in that, A first oil return bin liquid level sensor is fixed on the top of the oil return bin, and a second oil return bin liquid level sensor is fixed on the bottom of the oil return bin.

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