CN104489819B - Potato frozen juice squeezing system and squeezing process thereof - Google Patents

Abstract

The invention relates to a squeezing system and a squeezing process of potato frozen juice. The process comprises squeezing frozen and thawed whole potato with squeezer, subjecting squeezed juice to multistage solid-liquid separation, filtering macromolecular proteins and starches, obtaining purified liquid rich in amino acids, proteins and active enzymes with molecular weight less than 5W Da, and preparing into 10mL or 30mL oral liquid with sterile bottle filling device. The system integrally executes pharmaceutical standard and GMP purification standard, does not need enzymolysis and color protection treatment in the production process, has few process steps, and the prepared oral liquid is clear and transparent, can not produce precipitation and color change phenomenon after being placed for a long time, and has long shelf life.

Description

Potato frozen juice squeezing system and squeezing process thereof

Technical Field

The invention belongs to the field of food processing, relates to a potato juice production system and a preparation method, and in particular relates to a potato frozen juice squeezing system and a squeezing process thereof.

Background

The potato juice is obtained by squeezing fresh potato. Contains vitamin A, vitamin C, minerals, starch, lignin, etc. Has prophylactic and therapeutic effects on various diseases, such as weakness of spleen and stomach, dyspepsia, incoordination between intestines and stomach, constipation, etc., and can relieve mental stress. In addition, potatoes have good skin care effect, especially on fragile periocular skin. The method has been adopted by De nationality since ancient times to treat stomach illness and constipation. Japanese Buddhist Gao Sengfu, who advocates fresh juice therapy of potato, has remarkable therapeutic effects.

The freshly squeezed potato juice not only changes color after being put for a period of time, but also has sediment to affect sales. In order to solve the problems of precipitation and discoloration, amylase is usually required to be added in the preparation process to carry out enzymolysis on starch, and color fixatives such as VC and the like are added to prevent raw juice from browning.

By searching, the following two published patent documents were found:

1. a process for the preparation of potato concentrate (CN 102835705 a), characterized by comprising the steps of: (1) pretreatment: removing mud, peeling and crushing the potatoes to prepare potato pulp; (2) amylase liquefaction: adding amylase into potato slurry for liquefying; (3) squeezing: squeezing the potato pulp by using a belt squeezer; (4) enzymolysis: adjusting the pH of the pressed juice of the potato to 3.5-4.5, adding pectase for decomposing for 1-3 hours, and adding saccharifying enzyme for decomposing for 1-3 hours; (5) ultrafiltration: adding activated carbon into the juice obtained by the enzymolysis to decolorize, and filtering by ultrafiltration equipment to obtain potato clear juice; (6) concentrating: vacuum concentrating the potato clear juice to 40-70 Brix of soluble solids to obtain potato concentrated juice; and (7) filling.

2. A method for preparing color potato pulp juice (CN 103431464 a), which is characterized by comprising the following steps: 1) Cleaning: removing mud, peel and bud eyes of the colored potatoes, ensuring that the potato blocks are clean, and obtaining clean potato blocks; wherein, the peeling mode is that sodium hydroxide solution with the mass concentration of 1% is adopted for soaking for 10min, the temperature of the sodium hydroxide solution is 90 ℃, and then citric acid with the mass concentration of 0.5% is used for neutralization; 2) Homogenate preparation: crushing the cleaned potato blocks obtained in the step 1), and preparing homogenate to obtain potato pulp; wherein hot water with the temperature of 100 ℃ is added during crushing, and the volume of the hot water is 1.5 times of that of the potato pulp; the crushing is carried out while color protection is carried out, the color protection agent adopts VC, sodium iso-VC and citric acid, and the addition amounts of the VC, the sodium iso-VC and the citric acid are respectively 0.05 percent, 0.15 percent and 0.1 percent of the weight of the potato tuber by weight; 3) Amylase liquefaction: adding amylase into the potato pulp obtained in the step 2) for liquefying to obtain potato pulp liquefied by the amylase; wherein the addition amount of amylase is 0.15% of the weight of potato tuber, the enzymolysis temperature is 85 ℃, and the enzymolysis time is 2.5 hours; 4) And (3) squeezing: squeezing the potato pulp liquefied by the amylase obtained in the step 3) by using a belt squeezer to obtain potato squeezed juice; the squeezing time is 20min; 5) Enzymolysis: adjusting the pH of the potato squeezed juice obtained in the step 4) to 4 by using a citric acid aqueous solution or a citric acid monohydrate aqueous solution, adding pectase for decomposing for 2 hours, and adding saccharifying enzyme for decomposing for 2 hours to obtain the potato squeezed juice after enzymolysis; wherein, the adding proportion of pectase is 0.1% of the weight of the potato juice by weight, and the adding proportion of saccharifying enzyme is 0.3% of the weight of the potato juice by weight; 6) Ultrafiltration: filtering the potato squeezed juice obtained in the step 5) through ultrafiltration equipment to remove impurities, thereby obtaining potato nutrition filtrate; 7) Concentrating: concentrating the potato nutrition filtrate obtained in the step 6) to 45Brix as a soluble solid in vacuum to obtain potato concentrated juice; 8) And (3) filling: and (3) filling the potato concentrated juice obtained in the step 7) into a container with the specification, and sealing.

Both of the above patent documents solve the problem of precipitation of potato juice by enzymolysis, and solve the problem of discoloration of potato juice by adding a color fixative. The process is complicated and the production cost is high.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a potato frozen juice squeezing system and a squeezing process thereof, wherein the prepared juice is transparent, clear and long in storage time without enzymolysis and without adding color fixative.

The technical scheme adopted for solving the technical problems is as follows:

a squeezing system for potato frozen juice comprises a conveying device, a squeezer and a filtering system, potato materials enter the squeezer through the conveying device, and the squeezed potato juice enters the filtering system for storage after being filtered.

The conveying device comprises a feeding conveyor, a rotary distribution plate, a bucket elevator and a separating funnel, wherein the rotary distribution plate is arranged below the output end of the feeding conveyor, a discharge valve is arranged below the rotary distribution plate, the lower end of the bucket elevator is arranged below the discharge valve, and the separating funnel is arranged below the high end of the bucket elevator.

And the rotary distribution plate comprises a rotary disk, a coaming, distribution channels and a stripper plate, the rotary distribution plate is driven to rotate by a rotary motor arranged below the rotary disk, the coaming is arranged at the outer edge of the rotary disk, a discharge hole is formed in one side of the coaming in the radial direction, the discharge hole is divided into a plurality of distribution channels by a partition plate, the stripper plate is hinged on a bottom plate at the outer end of the discharge hole, two ends of the stripper plate are respectively connected with two sides of the discharge hole by a hydraulic rod, the coaming is of a double-layer hollow structure, a gap is reserved between the outer edge of the rotary disk and the outer layer of the coaming, and melted potato juice enters the chute of the coaming from the gap.

The discharging valve comprises a shell, a valve core, a pushing cylinder, a unidirectional flywheel and an electromagnetic brake, wherein the shell is cylindrical, an inlet and an outlet are respectively formed in the upper end and the lower end of the wall of the shell, the valve core is coaxially sleeved in the shell, a plurality of discharging grooves are uniformly distributed in the radial direction of the valve core, each discharging groove is divided into two parts by a partition plate, the two ends of a core shaft of the valve core penetrate out of the shell, a shaft seat is sleeved at one end of the discharging groove, the bearing seat sleeved at the other end is coaxially sleeved with the unidirectional flywheel, a connecting rod is fixedly arranged at the outer end face of the unidirectional flywheel, a connecting sleeve is fixedly arranged at the outer end face of the flywheel in a surrounding manner, the electromagnetic brake and a supporting plate are sequentially sleeved at the end part of the core shaft sleeved with the flywheel from outside to inside, the pushing cylinder is vertically fixedly arranged at the inner end face of the supporting plate through a supporting frame, and a pushing rod of the pushing cylinder applies force on the upper end face of the connecting sleeve.

The squeezer comprises a frame, a die bottom plate, a die coaming, coaming lifting devices and punches, wherein the die bottom plate is fixedly arranged on the top surface of the frame, guide posts are fixedly arranged at four corners of the top surface of the frame, a top frame is fixedly arranged on the tops of the guide posts, a middle frame is slidably arranged on the guide posts between the top frame and the frame, a cylinder is fixedly arranged on the top surface of the top frame, a piston rod of the cylinder acts on the top of the middle frame, two punches are symmetrically and fixedly arranged on the bottom surface of the middle frame, the die coaming is arranged between the two punches and the die bottom plate, two coaming lifting devices are symmetrically and fixedly arranged on two sides between the die coaming and the die bottom plate, sliding posts are fixedly arranged at four corners between the die coaming and the die bottom plate, two through holes are symmetrically formed in the die coaming correspondingly, two circular juice squeezing grooves are symmetrically formed in the die bottom plate correspondingly and coaxially arranged in each juice squeezing groove, a plurality of circles of juice squeezing channels are formed in the die bottom plate in the radial direction, juice squeezing channels are formed in the connecting juice squeezing channels, juice squeezing converging channels are formed in the side walls, and juice converging channels are connected.

Moreover, filtration system include coarse filtration storage tank, coarse filtration unit, fine filtration unit and ultrafiltration unit, the inlet pipe of coarse filtration storage tank is connected with the discharging pipe of juice extractor, the discharging pipe of coarse filtration storage tank is connected with coarse filtration unit, fine filtration unit and ultrafiltration unit in proper order, the output of ultrafiltration unit is connected to the finished product jar.

The coarse filter component is separated by 4 stages, and finally the frozen potato juice is filtered to be less than 1 mu m; the fine filter component is subjected to 2-stage separation, and finally the frozen potato juice is filtered to be less than 0.05 mu m.

Moreover, the ultrafilter component is 2-stage separation, and finally the frozen potato juice is filtered to below 5 ten thousand Da.

And the filtering system is connected with an acid-base cleaning system, and the acid-base cleaning system performs high-temperature steam sterilization and acid-base cleaning on each stage of filtering equipment of the filtering system.

A squeezing process of potato frozen juice comprises the following steps:

freezing: cleaning potato, peeling, directly freezing in freezer at-18deg.C to-50deg.C for more than 24 hr until it is frozen thoroughly;

melting of the following materials: taking out frozen potato, and thawing at room temperature;

and (3) squeezing: squeezing the completely melted whole potatoes by a squeezer;

coarse filtration: separating by 4 stages, and filtering the potato frozen juice to below 1 μm;

fine filtration: separating by 2 stages, and filtering the potato frozen juice to below 0.05 μm;

performing ultrafiltration: separating by 2 stages, and filtering the potato frozen juice to below 5 ten thousand Da;

sterile filling and sealing.

The invention has the advantages and positive effects that:

1. the invention presses frozen and melted whole potato by a squeezer, separates the pressed juice by multistage solid-liquid separation, filters macromolecular proteins and starch, finally obtains purified liquid which is rich in amino acid, protein and active enzyme and has molecular weight less than 5 ten thousand Da, and prepares 10mL or 30mL oral liquid by a sterile bottle filling device. The system integrally executes pharmaceutical standard and GMP purification standard, does not need enzymolysis and color protection treatment in the production process, has few process steps, and the prepared oral liquid is clear and transparent, can not produce precipitation and color change phenomenon after being placed for a long time, and has long shelf life.

2. The potato material does not need peeling or mincing, only needs thawing treatment after freezing, and is directly conveyed to a squeezer for squeezing, so that the potato material is obviously different from the existing squeezing mode. The volume expansion of the frozen water is generated, so that the potato skin is pierced by the ice crystal when the ice crystal is generated, the water and the soluble matters contained in the potato are exuded when the ice crystal is melted, and the water connected with the dietary fiber is removed, so that the effect of a filter skeleton is achieved.

3. The control system of the invention adopts the Siemens S7 system, which is stable, can meet the continuous upgrading requirement, simultaneously coexist with a manual system and an automatic system, and meets the control requirements of automatic control, back-front cleaning, high-temperature steam sterilization (including periodical chemical automatic sterilization) and control of air isolation of the system in the whole processes of feeding, filling, squeezing, deslagging, rough filtering, fine filtering, ultrafiltration and bottling systems, and the production process completely realizes automatic control and reaches unattended operation.

4. The invention uses the squeezer to squeeze juice, is different from the traditional juicer in structure, is more suitable for squeezing whole potatoes, and has high juice yield and easy discharge of potato residues.

5. The filtering system of the invention is divided into multiple stages, and only the purifying liquid which has the molecular weight of less than 5 ten thousand Da and is rich in amino acid, protein and active enzyme is left after coarse filtration, fine filtration and ultrafiltration, thus being more beneficial to intestinal absorption.

Drawings

FIG. 1 is a front view of the present system;

FIG. 2 is a schematic perspective view of the system;

FIG. 3 is a perspective view of a loading conveyor;

FIG. 4 is a front view of the structure of a rotating distribution plate;

FIG. 5 is a top view of FIG. 4;

FIG. 6 is a cross-sectional view taken along line A-A of FIG. 4;

FIG. 7 is a perspective view of a rotating distribution plate;

FIG. 8 is a front elevational view of the discharge valve;

FIG. 9 is a top view of FIG. 8;

FIG. 10 is a cross-sectional view taken along line B-B of FIG. 8;

FIG. 11 is a schematic perspective view of a discharge valve;

FIG. 12 is an enlarged schematic view of the structure of portion C of FIG. 11;

FIG. 13 is a perspective view of a bucket elevator;

FIG. 14 is a front view of the separating funnel;

FIG. 15 is a top view of FIG. 14;

fig. 16 is a front view of the press;

FIG. 17 is a right side view of FIG. 16;

fig. 18 is a perspective view of a press;

fig. 19 is a perspective view of the mold base plate.

Detailed Description

The invention will now be described in further detail by way of specific examples, which are given by way of illustration only and not by way of limitation, with reference to the accompanying drawings.

A squeezing system for potato frozen juice comprises a conveying device, a squeezer 6, a filtering system and an acid-base cleaning body system 1, potato materials enter the squeezer through the conveying device, and the squeezed potato juice enters the filtering system for filtration and then is stored.

The conveying device comprises a feeding conveyor 3, a rotary distribution plate 2, a bucket elevator 4 and a separating funnel 5, wherein the rotary distribution plate is arranged below the output end of the feeding conveyor, a discharge valve 15 is arranged below the rotary distribution plate, the lower end of the bucket elevator is arranged below the discharge valve, and the separating funnel is arranged below the high end of the bucket elevator.

The feeding conveyor comprises a chain conveyor 17, a feeding tray 16 and a liquid receiving hopper 18, wherein a plurality of feeding trays are fixedly arranged between two chains of the chain conveyor at intervals around the chain, and in order not to leak the melted juice of the potatoes, the feeding trays and the potatoes are poured into the rotary distribution tray together, and the liquid receiving hopper is fixedly arranged below the chain conveyor.

The rotary distribution plate comprises a rotary plate 24, a coaming 19, a distributing channel 25 and a stripper plate 22, wherein the rotary distribution plate is driven to rotate by a rotary motor 20 arranged below the rotary plate, the coaming is arranged at the outer edge of the rotary plate, a discharging hole 21 is formed by extending one side of the coaming in the radial direction, the discharging hole is divided into a plurality of distributing channels by a partition plate, the stripper plate is hinged on a bottom plate at the outer end of the discharging hole, and two ends of the stripper plate are respectively connected with two sides of the discharging hole by a hydraulic rod 23. The coaming is of a double-layer hollow structure, the outer edge of the rotary disk is inserted into the coaming, a gap is reserved between the outer edge of the rotary disk and the outer layer of the coaming, and melted potato juice enters the chute 26 of the coaming from the gap.

The discharge valve comprises a shell 27, a valve core 38, a pushing cylinder 28, a unidirectional flywheel 36 and an electromagnetic brake 32, wherein the shell is cylindrical, an inlet and an outlet are respectively formed in the upper end and the lower end of the wall of the shell, a valve core is coaxially sleeved in the shell, a plurality of discharge grooves 37 are uniformly distributed in the radial direction of the valve core, each discharge groove is divided into two parts by a partition plate, two ends of a core shaft 33 of the valve core penetrate out of the shell, a shaft seat is sleeved at one end of the discharge groove, a unidirectional flywheel is coaxially sleeved outside a bearing seat sleeved at the other end of the discharge groove, a connecting rod 34 is fixedly installed at the outer end face of the unidirectional flywheel, and a connecting sleeve 35 is fixedly installed around the outer end face of the flywheel. The end part of the mandrel for sleeving the flywheel is sequentially sleeved with an electromagnetic brake and a supporting plate 31 from outside to inside, the inner end surface of the supporting plate is vertically fixedly provided with a pushing cylinder through a supporting frame 30, and a push rod 29 of the pushing cylinder applies force on the upper end surface of the connecting sleeve. The push rod pushes the connecting sleeve to enable the flywheel to drive the mandrel to rotate, so that potato materials falling into the discharge chute from the inlet are released into a bucket elevator hopper below the receiving valve from the outlet.

The bucket elevator comprises a chain conveying elevator 39, hoppers 41 and liquid receiving tanks 40, wherein the hoppers are uniformly distributed and arranged between chains at two sides of the chain conveying elevator at intervals around the chains, each hopper is divided into two parts by a partition plate, and the liquid receiving tanks are fixedly arranged below the chain conveying elevator for receiving molten soup of potatoes.

The distributing hopper consists of a distributing disc 42, a chute 43 and a partition plate 44, wherein the distributing disc is fixedly arranged below the high end of the bucket elevator, the distributing disc and the hopper of the bucket elevator are correspondingly divided into two sections by the partition plate, the bottom plate of each section is communicated with the chute, and the two chutes respectively extend to two juice squeezing grooves of the bottom plate of the squeezer die.

The squeezer comprises a frame 54, a die bottom plate 53, a die coaming 52, coaming lifting devices 51 and punches 50, wherein the die bottom plate is fixedly arranged on the top surface of the frame, guide posts 48 are fixedly arranged at four corners of the top surface of the frame, a top frame 46 is fixedly arranged on the tops of the guide posts, a middle frame 49 is slidably arranged on the guide posts between the top frame and the frame, a cylinder 45 is fixedly arranged on the top surface of the top frame, piston rods 47 of the cylinder act on the top of the middle frame, two punches are symmetrically and fixedly arranged on the bottom surface of the middle frame, the die coaming is arranged between the two punches and the die bottom plate, two coaming lifting devices are symmetrically and fixedly arranged on two sides of the die coaming and the die bottom plate, and sliding posts 55 are fixedly arranged at four corners of the die coaming and the die bottom plate. Two through holes are symmetrically formed on the die coaming corresponding to the two punches, two circular juice extracting grooves 57 are symmetrically formed on the die bottom plate corresponding to the two punches, a plurality of circles of juice extracting flow passages 56 are uniformly and coaxially formed in each juice extracting groove in a radial direction, juice extracting converging passages 58 are connected with the juice extracting flow passages, and juice extracting flow openings 59 are formed on the side wall of the die bottom plate and connected with the juice extracting converging passages.

The working principle of the pressure juicer is as follows: the potato material is poured into two juice grooves of mould bottom plate respectively from two elephants of feed hopper, and the potato material is enclosed by the mould bounding wall, and the drift pushes down to flatten the potato of whole grain, extrudes the potato juice, and the potato juice flows out from juice flow mouth along the passageway that gathers of squeezing juice in the juice groove through squeezing juice, and in the rethread pipeline got into juice collector 14, then rises drift and mould bounding wall, pushes away the sediment of potato on the sediment conveyer belt 13 that is located pressure juicer opposite side through the ejector pin 7 of installing in pressure juicer one side, accomplishes a juice cycle.

The juice collector not only collect the potato juice that the pressure juice extractor pressed, but also collect the potato that flows out in the conveying process through the pipeline respectively and melt the juice, specifically: infusion tubes are respectively connected between the liquid receiving hopper of the feeding conveyor and the juice collecting device, between the chute of the rotary distribution disc and the juice collecting device, and between the liquid receiving tank of the bucket elevator and the juice collecting device.

The potato juice that juice collector collected needs to get into filtration system and further filters, filtration system include coarse filtration storage tank 8, coarse filtration unit 9, fine filtration unit 10 and ultrafiltration unit 11, the inlet pipe of coarse filtration storage tank is connected with the discharging pipe of juice collector, the discharging pipe of coarse filtration storage tank is connected with coarse filtration unit, fine filtration unit and ultrafiltration unit in proper order, the output of ultrafiltration unit is connected finished product jar 12.

The coarse filter component is divided into four stages, which are respectively: 200 mesh (74 μm), 23 μm, 10 μm and 1 μm. Wherein, the liquid crystal display device comprises a liquid crystal display device,

the method comprises the steps that a 74 mu m-level filter tank is adopted, backwash frequency is controlled through pressure difference, and stainless steel is adopted as a material.

Stainless steel sintering nets are adopted for filtration of the 23 mu m level, the 10 mu m level and the 1 mu m level, the reflux quantity is determined through experiments, the backwash frequency is automatically controlled through pressure difference, and the equipment is sterilized by steam at 121 ℃ when the equipment is stopped, and chemical sterilization is performed periodically.

The fine filter component is separated into 2 stages, namely 0.1 mu m stage and 0.05 mu m stage, and the process adopts a titanium net.

The ultrafilter comprises 2-level separation, namely 10-ten thousand Da molecular weight (Dalton) and 5-ten thousand Da molecular weight, and is completed by a high-temperature-resistant ceramic ultrafilter unit.

The filtering system is basically completely closed, the intermediate storage tank is completely provided with an ultrafiltration membrane breathing system, and under the aseptic purification environment, the production line completely meets the requirements of pharmacopoeia production technology and stops bacteria from entering. Meanwhile, each stage of filtration of the filtration system adopts a pharmaceutical grade pump, each equipment and liquid contact part adopts stainless steel 316L, welding adopts single-sided welding and double-sided molding, and GMP standard is strictly implemented; when the production workshop realizes GMP standardized production, the filter system can completely meet the requirements, and the filter system can meet the requirements of steam sterilization at a high temperature of more than 121 ℃.

In addition, the filtering system is also connected with an acid-base cleaning system, the acid-base cleaning system can realize high-temperature steam sterilization and chemical acid-base sterilization of the production line, the online steam sterilization and the sterilization of the filtering system are required to be carried out for 50min after the production is finished every day, the steam sterilization and the sterilization temperature is more than or equal to 121 ℃, and the chemical acid-base sterilization and the sterilization are carried out for 1 time in a cycle about 10 days.

The control system of the invention adopts the Siemens S7 system, which is stable, can meet the continuous upgrading requirement, simultaneously coexist with a manual and automatic system, and meets the control requirements of automatic control, positive and negative cleaning, high-temperature steam sterilization (including periodic chemical automatic sterilization) and control requirement of air isolation of the system in the whole processes of feeding, filling, squeezing, deslagging, rough filtering, fine filtering and ultra filtering and bottling systems, and the production process completely realizes automatic control and reaches unattended operation.

A squeezing process of potato frozen juice comprises the following steps:

freezing: cleaning potato, directly freezing in freezer at-18 deg.C to-50 deg.C for more than 24 hr until it is frozen thoroughly, preferably 24-48 hr;

melting of the following materials: taking out frozen potato, and thawing at room temperature;

and (3) squeezing: squeezing the completely melted whole potatoes by a squeezer;

coarse filtration: divided into four steps, 200 mesh (74 μm), 23 μm, 10 μm and 1 μm in this order.

(1) 74 μm separation system: mainly adopts a folding type filtering system, and controls the backwashing frequency through pressure difference;

(2) the 23 mu m, the 10 mu m and the 1 mu m are mainly 316L stainless steel sintering nets, and the backwashing frequency is automatically controlled by pressure difference;

fine filtration: the filtered liquid after coarse filtration is sent into a 0.1 mu m titanium mesh precise filter unit, and the filtered liquid is filtered by the 0.05 mu m titanium mesh precise filter unit through reasonable circulation;

performing ultrafiltration: sequentially filtering the filtrate after precise filtration by an ultrafiltration unit with molecular weight of 10 ten thousand Da (daltons) and molecular weight of 5 ten thousand Da;

sterile filling and sealing.

The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that variations and modifications can be made without departing from the scope of the invention.

Claims (1)

1. A potato frozen juice squeezing system, characterized by: the potato juice squeezing machine comprises a conveying device, a squeezing machine and a filtering system, wherein potato materials enter the squeezing machine through the conveying device, and squeezed potato juice enters the filtering system for filtering and then is stored;

the conveying device comprises a feeding conveyor, a rotary distribution plate, a bucket elevator and a separating funnel, wherein the rotary distribution plate is arranged below the output end of the feeding conveyor, a discharge valve is arranged below the rotary distribution plate, the lower end of the bucket elevator is arranged below the discharge valve, and the separating funnel is arranged below the high end of the bucket elevator;

the rotary distribution plate comprises a rotary plate, a coaming, distribution channels and a stripper plate, wherein the rotary plate is driven to rotate by a rotary motor arranged below the rotary plate, the coaming is arranged at the outer edge of the rotary plate, a discharge hole is formed in one radial side of the coaming in an extending mode, the discharge hole is divided into a plurality of distribution channels through a partition plate, the stripper plate is arranged on a bottom plate at the outer end of the discharge hole in a hairpin mode, two ends of the stripper plate are respectively connected with two sides of the discharge hole through hydraulic rods, the coaming is of a double-layer hollow structure, the outer edge of the rotary plate is inserted into the coaming, a gap is reserved between the outer edge of the rotary plate and the outer layer of the coaming, and melted potato juice enters the chute of the coaming from the gap;

the discharging valve comprises a shell, a valve core, a pushing cylinder, a unidirectional flywheel and an electromagnetic brake, wherein the shell is cylindrical, an inlet and an outlet are respectively formed in the upper end and the lower end of the wall of the shell, the valve core is coaxially sleeved in the shell, a plurality of discharging grooves are uniformly distributed in the radial direction of the valve core, each discharging groove is divided into two parts by a partition plate, the two ends of a core shaft of the valve core penetrate out of the shell, a shaft seat is sleeved at one end of the discharging groove, the bearing seat sleeved at the other end is coaxially sleeved with the unidirectional flywheel, a connecting rod is fixedly arranged at the outer end face of the unidirectional flywheel, a connecting sleeve is fixedly arranged at the outer end face of the flywheel in a surrounding manner, the electromagnetic brake and a supporting plate are sequentially sleeved at the end part of the core shaft sleeved with the flywheel from outside to inside, the pushing cylinder is vertically fixedly arranged at the inner end face of the supporting plate through a supporting frame, and a pushing rod of the pushing cylinder applies force on the upper end face of the connecting sleeve;

the squeezer comprises a frame, a die bottom plate, a die coaming, coaming lifting devices and punches, wherein the die bottom plate is fixedly arranged on the top surface of the frame, guide posts are fixedly arranged at four corners of the top surface of the frame, a top frame is fixedly arranged on the top of the guide posts, a middle frame is slidably arranged on the guide posts between the top frame and the frame, a cylinder is fixedly arranged on the top surface of the top frame, a piston rod of the cylinder acts on the top of the middle frame, two punches are symmetrically and fixedly arranged on the bottom surface of the middle frame, the die coaming lifting devices are symmetrically and fixedly arranged between the two punches and the die bottom plate, sliding posts are fixedly arranged at four corners between the die coaming and the die bottom plate, two through holes are symmetrically formed on the die coaming corresponding to the two punches, two circular juice squeezing grooves are symmetrically formed on the die bottom plate corresponding to the two punches, a plurality of circles of juice squeezing channels are radially and uniformly distributed in each juice squeezing groove, a juice squeezing converging channel is formed in a connecting way, and a juice converging channel is connected on the side wall of the die bottom plate;

the filtering system comprises a coarse filtering storage tank, a coarse filtering unit, a fine filtering unit and an ultrafiltration unit, wherein a feed pipe of the coarse filtering storage tank is connected with a discharge pipe of the juicer, the discharge pipe of the coarse filtering storage tank is sequentially connected with the coarse filtering unit, the fine filtering unit and the ultrafiltration unit, and the output end of the ultrafiltration unit is connected with a finished product tank;

the coarse filter component is subjected to 4-level separation, and finally the frozen potato juice is filtered to be less than 1 mu m; the fine filter component is subjected to 2-stage separation, and finally potato frozen juice is filtered to be less than 0.05 mu m;

the ultrafilter component is 2-level separation, and finally the frozen juice of the potatoes is filtered to below 5 ten thousand Da;

the filtering system is connected with an acid-base cleaning system, and the acid-base cleaning system performs high-temperature steam sterilization and acid-base cleaning on each level of filtering equipment of the filtering system;

the squeezing process comprises the following steps:

freezing: cleaning potato, peeling, directly freezing in freezer at-18deg.C to-50deg.C for more than 24 hr until it is frozen thoroughly;

melting of the following materials: taking out frozen potato, and thawing at room temperature;

and (3) squeezing: squeezing the completely melted whole potatoes by a squeezer;

coarse filtration: separating by 4 stages, and filtering the potato frozen juice to below 1 um;

fine filtration: separating by 2 stages, and filtering the potato frozen juice to below 0.05 um;

performing ultrafiltration: separating by 2 stages, and filtering the potato frozen juice to below 5 ten thousand Da;

sterile filling and sealing.

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