CN220734378U

CN220734378U - Pea deep processing pretreatment system

Info

Publication number: CN220734378U
Application number: CN202322473028.4U
Authority: CN
Inventors: 鲍大权; 胡明辉; 余新成; 王志琦
Original assignee: Myande Group Co Ltd
Current assignee: Myande Group Co Ltd
Priority date: 2023-09-12
Filing date: 2023-09-12
Publication date: 2024-04-09
Anticipated expiration: 2033-09-12

Abstract

The utility model discloses a pea deep processing pretreatment system, which comprises: pea cleaning unit: the device is provided with two stages of cylindrical cleaning sieves connected in series, and a discharge hole of each cylindrical cleaning sieve is connected with a roller magnetic separator; pea storage unit: the steel plate bin is connected with the scraper conveyor through a lifter; pea metering stone removal unit: the scraper conveyor and the elevator are connected with an inlet of the flow scale, and an outlet of the flow scale is connected with the specific gravity stone removing machine; pea impurity removal grading unit: the pea outlet of the impurity bean removing machine is connected with the inlet of the classifier, and the pea outlet of the classifier is connected with the soybean bin through the lifter respectively; pea soaking unit: the outlet of the big pea bin and the outlet of the small pea bin are connected with a stone removing groove, and the discharge port of the stone removing groove is connected with the feed inlets of the soaking tanks through a bean water conveying pump; the immersion liquid return pipe of each tank is connected with the water inlet of the stone removing tank through a return pump. The system can thoroughly remove impurities and miscellaneous beans, and can carry out graded soaking on peas.

Description

Pea deep processing pretreatment system

Technical Field

The utility model relates to a pea deep processing pretreatment system, and belongs to the technical field of pea deep processing systems.

Background

The pea starch has better physical and chemical indexes such as whiteness, transparency, low protein, good flexibility, film forming property and the like than other starches. The pea protein contains all amino acids necessary for human body, belongs to complete protein, has good water solubility and other characteristics, and can be added into various foods to improve the nutrition structure and quality.

The peas contain impurities such as side stones and the like, and are difficult to screen. During the production and transportation of peas, beans such as soybeans and the like are mixed, and pea proteins are not allergic, so that the soybean proteins are easy to cause allergy of certain people.

Some traditional processes adopt pure water for soaking, the production cost is higher, some peas are soaked after being crushed, the power consumption is high, and the dry matter loss is high. Some of the pea fibers are soaked by sodium hydroxide, chemicals are used, the product quality is affected, and the pea fibers cannot be used as dietary fibers.

The peas with different particle sizes need different soaking time, and the same soaking time is adopted, so that the soaking time is too long, the quality of products is affected, and excessive dry flow loss is caused.

The Chinese patent application with publication number of CN115304682A discloses a pea starch extraction method, which comprises the following operation steps: peeling and grinding: peeling pea seeds, and grinding to obtain pea powder; preparing powder slurry: adding water into the prepared pea powder, and uniformly stirring to obtain powder slurry; soaking and leaching: placing the prepared slurry into a stirrer, stirring once at intervals, repeating for multiple times, and standing for precipitation; primary screening: removing the supernatant in the product obtained in the last step, adding water, uniformly stirring, and sieving to obtain slurry; secondary screening: standing the slurry for precipitation, removing part of supernatant, uniformly stirring, and sieving again; cyclone separation: centrifuging the product obtained in the last step and removing supernatant to obtain precipitate; and (3) drying: the precipitate was dried. The method simplifies the pea starch extraction process, reduces the water consumption during extraction, saves the preparation time, reduces the extraction cost, greatly improves the extraction efficiency, and is more energy-saving and environment-friendly. "

The drawbacks of this application are: 1. the peeling, grinding and soaking processes are adopted, the grinding process needs to grind peas finely, and the dry grinding power consumption is high;

2. the peas are not cleaned, impurities and miscellaneous beans are not removed, and the product quality is affected;

3. the beans are soaked after being crushed, so that the soaked water is high in impurity content, cannot be used, and takes away a large amount of dry matters, so that the dry matters are lost.

The Chinese patent application with publication No. CN110432375A discloses a process method for extracting pea protein isolate, which comprises the steps of selecting raw materials, soaking peas, cleaning and peeling, grinding, collecting supernatant, precipitating and drying, selecting pea varieties for preparing pea protein, screening peas to remove particle impurities and smaller pea grains in the peas, soaking the screened peas in purified water, ensuring that the water surface is soaked in upper peas, removing the skin of the peas after the peas are soaked, washing the peas after peeling, airing, grinding the peas after airing, ensuring that the peas are uniformly ground, adding the supernatant into a prepared acidic solution, mixing, centrifuging again, collecting the precipitate, and drying to finish the pea protein isolate. The process method for extracting pea protein isolate controls the separation procedure of pea grains and the pH value when the pea protein isolate, and has good protein isolation effect on the pea grains "

The defects of the utility model application are that: 1. the selecting, soaking, cleaning and peeling process is adopted, so that no clear removal of particle impurities is realized;

2. the process treats smaller peas as waste materials, so that the economy of the process is affected;

3. pure water is adopted for soaking, so that the cost is high.

Disclosure of Invention

The utility model aims to overcome the problems in the prior art, and provides a pea deep processing pretreatment system which can reliably remove impurities such as shoulder stones and the like and beans such as soybeans and the like, and realize graded soaking of peas according to particle sizes so as to improve the product quality.

In order to solve the technical problems, the pea deep processing pretreatment system of the utility model comprises:

pea cleaning unit: the upper end outlet of the first bucket elevator is connected with the inlet of the primary cylinder cleaning sieve, the discharge port of the primary cylinder cleaning sieve is connected with the inlet of the secondary cylinder cleaning sieve, and the discharge port of the secondary cylinder cleaning sieve is connected with the inlet of the roller magnetic separator;

pea storage unit: the inlet at the lower end of the second bucket elevator is connected with the outlet of the roller magnetic separator, the outlet at the upper end of the second bucket elevator is connected with the inlet of the second scraper conveyor, the outlet of the second scraper conveyor is connected with the inlet at the upper end of the steel plate bin, and the outlet at the lower end of the steel plate bin is connected with the inlet of the third scraper conveyor;

pea metering stone removal unit: the inlet at the lower end of the third bucket elevator is connected with the outlet of the third scraper conveyor, the outlet at the upper end of the third bucket elevator is connected with the inlet of a flow scale, and the outlet of the flow scale is connected with the inlet of the specific gravity stone remover;

pea impurity removal grading unit: the lower end inlet of the fourth bucket elevator is connected with the discharge port of the specific gravity stoning machine, the upper end outlet of the fourth bucket elevator is connected with the inlet of the impurity bean removing machine, the pea outlet of the impurity bean removing machine is connected with the inlet of the classifier, the large pea outlet of the classifier is connected with the lower end inlet of the large pea elevator, and the upper end outlet of the large pea elevator is connected with the inlet of the large pea bin; the small pea outlet of the classifier is connected with the inlet of the lower end of the small pea lifting machine, and the outlet of the upper end of the small pea lifting machine is connected with the inlet of the small pea bin;

pea soaking unit: the bottom outlets of the big pea bin and the small pea bin are respectively connected with the inlet of the stone removing groove through the electric gate, the discharge outlet of the stone removing groove is connected with the inlet of the bean water conveying pump, the outlet pipeline of the bean water conveying pump is connected with the feed inlet of each soaking tank, the upper end of each soaking tank is also connected with a lactic acid injection pipe, the bottom outlet of each soaking tank is connected with the inlet of the soaking liquid circulating pump and the soaking liquid return pipe, the outlet of the soaking liquid return pipe is connected with the inlet of the soaking liquid return pump, and the outlet pipeline of the soaking liquid return pump is connected with the water inlet of the stone removing groove.

The pea receiving unit comprises a discharging hopper, wherein the upper port of the discharging hopper is covered with a discharging grid, the bottom outlet of the discharging hopper is connected with the inlet of a first scraper conveyor, and the outlet of the first scraper conveyor is connected with the inlet of the lower end of the first bucket elevator.

As a further improvement of the utility model, the outlet of each soaking liquid circulating pump is respectively connected with the tube side inlet of each soaking liquid heater, and the tube side outlet of each soaking liquid heater is respectively connected with the soaking liquid inlets of the same-stage soaking tank and the next-stage soaking tank.

As a further improvement of the utility model, the tube side outlets of the soaking liquid heaters are respectively connected with a soaking liquid discharge tube.

As a further improvement of the utility model, the bottom outlet of each soaking tank is respectively connected with the inlet of the soaking discharging buffer tank, and the outlet of the soaking discharging buffer tank is conveyed to the subsequent unit through the soaking discharging pump.

As a further development of the utility model, the bottom outlet of each of the soaking tanks is also connected to a process water pipe from the subsequent unit, respectively.

As a further improvement of the utility model, the pea cleaning unit, the pea storage unit, the pea metering and stoning unit and the pea impurity removing and grading unit are respectively matched with a dust removing device.

Compared with the prior art, the utility model has the following beneficial effects: 1. the side-by-side stones, light impurities and the like mixed in peas are difficult to remove through screening, and the system adopts a two-stage cylinder cleaning screen, a specific gravity stone removing machine, a stone removing groove and the like to reliably extract the side-by-side stones, the light impurities and the like from the peas, so that the peas entering a processing system are ensured to be cleaner.

2. If the beans with different colors such as soybeans exist in raw material beans and the like enter a subsequent processing flow, the quality of a pea protein finished product can be affected, and the soybeans and the like in peas are screened out by adding a color selection procedure of a mixed bean removing machine, so that the mixing of protein allergens is avoided.

3. The pea granules have different requirements on soaking time, and the mixed soaking not only affects the quality of the product, but also causes partial dry matter loss. The system reasonably distinguishes the actual soaking time of the pea grains, and different pea grains are separated into soybeans and beans through a grader and then soaked respectively.

4. The soaking tank adopts lactic acid for natural fermentation, does not adopt an alkali dissolution method, does not use a large amount of sodium hydroxide, and has better starch quality.

5. The soaking liquid discharged from the soaking unit is used as the process water of the stone removing tank; and after the soaking tanks are discharged, the tanks are washed by adopting the subsequent process water, so that the water consumption of the system is reduced, and the pollution discharge is reduced.

6. In the production process of the system, dust is collected and treated through the brake and pulse dust collector and the like, so that the system is environment-friendly.

7. The countercurrent soaking process is adopted, so that the water consumption is lower; and the whole grain soaking process is adopted, so that the loss of dry matters is less, the crushed pea fiber has large particles, the dehydration is easy, the steam consumption is low, and the pea fiber can be used as dietary fiber.

Drawings

The utility model will now be described in further detail with reference to the drawings and the detailed description, which are provided for reference and illustration only and are not intended to limit the utility model.

FIG. 1 is a flow chart of a pea receiving, cleaning, storing, metering and stoning and impurity removing grading unit in the utility model;

FIG. 2 is a flow chart of the pea infusion unit of the utility model;

in the figure: pea receiving unit: 101. a hydraulic flap; 102. a discharge grid; 103. a discharge hopper; 104. a first scraper conveyor; 105. a discharging dust-removing wind net; 106. a discharge pulse dust collector; 107. a discharging dust removing fan;

pea cleaning unit: 201. a first bucket elevator; 202. a primary cylinder cleaning screen; 203. a secondary cylinder cleaning screen; 204. a roller magnetic separator; 205, a material-turning dust-removing wind net; 206. turning material to brake the dragon; 207. a material transferring pulse dust collector; 208. a material-transferring dust-removing fan;

pea storage unit: 301. a second bucket elevator; 302. a second scraper conveyor; 303. a steel plate bin; 304. a third scraper conveyor;

pea metering stone removal unit: 401. a third bucket elevator; 402. a flow balance; 403. a specific gravity stone remover; 404. a stone-removing grading dust-removing wind net; 405. stone-removing grading brake dragon; 406. a stone removing grading pulse dust collector; 407. a stone-removing grading dust-removing fan;

pea impurity removal grading unit: 501. a fourth bucket elevator; 502. a bean impurity removing machine; 503. a classifier; 504. a large pea elevator; 505. a small pea elevator; 506. a large pea bin; 507. a small pea bin;

pea soaking unit: 601. a stone removing groove; 602. a bean water delivery pump; 603. a soaking tank; 604. a soak solution circulating pump; 605. a soak solution heater; 606. a soaking liquid reflux pump; 607. soaking a discharging buffer tank; 608. soaking a discharging pump.

Description of the embodiments

In the following description of the present utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present utility model and simplifying the description, and do not mean that the device must have a specific orientation.

The utility model is further described with reference to the following detailed drawings in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the implementation of the utility model easy to understand.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

As shown in fig. 1 and 2, the pea deep-processing pretreatment system of the utility model comprises a pea receiving unit, a pea cleaning unit, a pea storage unit, a pea metering and stoning unit, a pea impurity removal and classification unit and a pea soaking unit.

In the pea receiving unit: the upper port of the discharge hopper 103 is covered with a discharge grid 102, the bottom outlet of the discharge hopper 103 is connected with the inlet of the first scraper conveyor 104, and the outlet of the first scraper conveyor 104 is connected with the inlet of the lower end of the first bucket elevator 201. Peas are transported to a factory through a bulk truck, are unloaded through a hydraulic turning plate 101, fall into a unloading hopper 103 through an unloading grid 102, and dust generated by unloading is conveyed to an unloading pulse dust collector 106 through negative pressure by an unloading dust removing air net 105 above the unloading grid 102 under the suction effect of an unloading dust removing fan 107. Peas are fed from the discharge hopper 103 and then sent by the first scraper conveyor 104 to the inlet of the first bucket elevator 201 to raise the peas to a suitable height.

In the pea cleaning unit: the upper end outlet of the first bucket elevator 201 is connected with the inlet of the primary cylindrical cleaning sieve 202, the discharge port of the primary cylindrical cleaning sieve 202 is connected with the inlet of the secondary cylindrical cleaning sieve 203, and the discharge port of the secondary cylindrical cleaning sieve 203 is connected with the inlet of the roller magnetic separator 204.

Peas lifted to a high position by the first bucket elevator 201 enter the first-stage cylindrical cleaning sieve 202 through a chute, peas screened out by the first stage enter the second-stage cylindrical cleaning sieve 203 through the chute, and the peas screened out by the second stage remove iron impurities through the roller magnetic separator 204. The impurities screened by the primary cylinder cleaning sieve 202 and the secondary cylinder cleaning sieve 203 are collected and intensively treated at the impurity outlet of the cylinder cleaning sieve by a screw conveyor.

Pea storage unit: the lower end inlet of the second bucket elevator 301 is connected with the outlet of the roller magnetic separator 204, the upper end outlet of the second bucket elevator 301 is connected with the inlet of the second scraper conveyor 302, the outlet of the second scraper conveyor 302 is connected with the upper end inlet of the steel plate bin 303, and the lower end outlet of the steel plate bin 303 is connected with the inlet of the third scraper conveyor 304.

After the peas are cleaned, the peas are ready to enter the bin, are lifted to the top position of the steel plate bin 303 by the second bucket elevator 301, are conveyed to the inlets of the steel plate bins 303 by the second scraper conveyor 302, and enter the bin under the middle discharge port of the second scraper conveyor 302. The steel plate bin 303 is matched with a corresponding ventilation system, and is monitored by a sensor to perform corresponding temperature adjustment during storage.

The discharge port of each steel plate bin 303 is connected with the inlet of the third scraper conveyor 304 through a discharge electric gate, and the discharge is controlled by the discharge electric gate.

The first scraper conveyor 104, the first bucket elevator 201, the first-stage cylinder cleaning sieve 202, the second-stage cylinder cleaning sieve 203, the second bucket elevator 301 and the dust overflow part of the second scraper conveyor 302 are respectively provided with dust covers, each dust cover is respectively connected with an inlet of a rotary material brake dragon 206 through a rotary material dust removal wind net 205, a top outlet of the rotary material brake dragon 206 is connected with an inlet of a rotary material pulse dust remover 207, an outlet of the rotary material pulse dust remover 207 is connected with an inlet of a rotary material dust removal fan 208, and an outlet of the rotary material dust removal fan 208 is communicated with the atmosphere.

Dust and impurities in the conveying and cleaning process are collected by a material-rotating dust-removing air net 205, heavier impurities are removed through a material-rotating brake dragon 206, discharged impurities are discharged from a wind seal device, and subsequent dust enters a material-rotating pulse dust remover 207 through a material-rotating dust-removing fan 208 to be sucked into the material-rotating pulse dust remover, and then are collected and treated uniformly.

Pea metering and stoning unit: the lower inlet of the third bucket elevator 401 is connected to the outlet of the third scraper conveyor 304, the upper outlet of the third bucket elevator 401 is connected to the inlet of the flow scale 402, and the outlet of the flow scale 402 is connected to the inlet of the gravity stoner 403. The peas discharged from the steel plate bin 303 are firstly conveyed to the lower end of the third bucket elevator 401 through the third scraper conveyor 304, then lifted to the position above the flow scale 402, and enter the flow scale 402 through a chute for metering.

Pea impurity removal and classification unit: the lower end inlet of the fourth bucket elevator 501 is connected with the discharge port of the specific gravity stoner 403, the upper end outlet of the fourth bucket elevator 501 is connected with the inlet of the impurity bean removing machine 502, the pea outlet of the impurity bean removing machine 502 is connected with the inlet of the classifier 503, the large pea outlet of the classifier 503 is connected with the lower end inlet of the large pea elevator 504, and the upper end outlet of the large pea elevator 504 is connected with the inlet of the large pea bin 506; the small pea outlet of the grader 503 is connected with the lower inlet of the small pea lifter 505, and the upper outlet of the small pea lifter 505 is connected with the inlet of the small pea bin 507.

The metered peas enter the specific gravity stoner 403, and are stoned by positive pressure specific gravity, so that a better stoning effect is obtained. The peas coming out of the specific gravity stoner 403 enter the fourth bucket elevator 501 again, are lifted to the upper part of the mixed bean removing machine 502, are subjected to color separation, and are separated out by the mixed bean removing machine 502, so that the mixed beans such as soybeans and the like are prevented from causing allergy of partial people due to soybean proteins.

The peas after impurity removal enter a grader 503 immediately, the grader 503 divides the peas into two grades according to the particle size of the peas, and the graded big peas are sent into a big pea bin 506 through a big pea lifter 504; the small peas after classification are sent to the small pea bins 507 by the small pea lifts 505.

The third bucket elevator 401, the specific gravity stoner 403, the fourth bucket elevator 501, the big pea elevator 504 and the small pea elevator 505 are respectively provided with dust covers at dust overflow positions, each dust cover is respectively connected with an inlet of the stoning classification brake dragon 405 through the stoning classification dust removal wind net 404, a top outlet of the stoning classification brake dragon 405 is connected with an inlet of the stoning classification dust removal fan 407, an outlet of the stoning classification dust removal fan 407 is connected with an inlet of the stoning classification dust removal fan 407, and an outlet of the stoning classification dust removal fan 407 is communicated with the atmosphere.

Under the suction effect of the stone-removing classifying dust-removing fan 407, dust and impurities in the pea lifting and stone-removing process are collected by the stone-removing classifying dust-removing air net 404, heavier impurities are removed through the stone-removing classifying brake dragon 405, discharged impurities are discharged from the air-stop device at the bottom, and subsequent dust enters and is sucked into the stone-removing classifying pulse dust remover 406 through the stone-removing classifying dust-removing fan 407, and then are collected and treated uniformly.

In the pea soaking unit: the bottom outlets of the big pea bin 506 and the small pea bin 507 are respectively connected with the inlet of the stoning groove 601 through an electric gate, the discharge port of the stoning groove 601 is connected with the inlet of the bean water conveying pump 602, and the outlet pipeline of the bean water conveying pump 602 is connected with the feed inlet of each soaking tank 603.

The big pea bin 506 and the small pea bin 507 are respectively discharged, and are controlled by an electric gate, the peas after being discharged firstly enter a stoning groove 601, side-by-side stones and partial light impurities in the peas are removed, and the stoning groove 601 is provided with a small bucket elevator for treating and conveying the light impurities therein. The circulating soak solution in the soak tank 603 is fed into the stoning tank 601 by the soak solution return pump 606, and then 1 is fed by the bean water feed pump 602: 4 are conveyed into the soaking tanks 603, two groups of six soaking tanks 603 are adopted, the soybeans are soaked separately, the soaking time of the soaking tanks 603 with different sizes is different, the material soaking time difference of each tank is less, and the product quality is more stable.

The bottom outlet of each soaking tank 603 is connected with the inlet of a soaking liquid circulating pump 604, the outlet of each soaking liquid circulating pump 604 is respectively connected with the tube side inlet of a soaking liquid heater 605, and the tube side outlet of each soaking liquid heater 605 is respectively connected with the soaking liquid inlets of the same-stage soaking tank and the next-stage soaking tank 603.

Both groups of soaking tanks 603 adopt a countercurrent soaking process, the soaking time is about 20 hours, and the soaking temperature is 30 ℃. The soaking liquid is returned to the tank for circulation through the soaking liquid circulating pump 604 or is conveyed to the next soaking tank 603, and the soaking temperature is ensured to be stable by heating through the soaking liquid heater 605 in the circulation process so as to achieve the best soaking effect. The whole peas in the soaking unit are soaked, and the lactic acid is naturally fermented in each soaking tank 603, so that chemicals such as sodium hydroxide and the like do not need to be added. The bottom outlets of the soaking tanks 603 are respectively connected with the inlets of the soaking discharging buffer tanks 607, and the outlets of the soaking discharging buffer tanks 607 are conveyed to the subsequent units through the soaking discharging pumps 608. The soaked peas enter a soaking discharging buffer tank 607 for temporary storage and are sent out by a soaking discharging pump 608.

The bottom outlet of each soaking tank 603 is connected with a soaking liquid reflux pipe, the outlet of the soaking liquid reflux pipe is connected with the inlet of a soaking liquid reflux pump 606, and the outlet pipeline of the soaking liquid reflux pump 606 is connected with the water inlet of the stone removing tank 601.

The tube side outlets of the soaking solution heaters 605 are also respectively connected with a soaking solution discharge tube for discharging the soaking solution, and the soaking solution can be added into feed.

The bottom outlets of the soaking tanks 603 are also connected with process water pipes from the subsequent units, and after peas in a certain soaking tank are discharged, the soaking tanks 603 can be flushed with subsequent process water, etc.

The foregoing description of the preferred embodiments of the present utility model illustrates and describes the basic principles, main features and advantages of the present utility model, and is not intended to limit the scope of the present utility model, as it should be understood by those skilled in the art that the present utility model is not limited to the above-described embodiments. In addition to the embodiments described above, other embodiments of the utility model are possible without departing from the spirit and scope of the utility model. The utility model also has various changes and improvements, and all technical schemes formed by adopting equivalent substitution or equivalent transformation fall within the protection scope of the utility model. The scope of the utility model is defined by the appended claims and equivalents thereof. The technical features of the present utility model that are not described may be implemented by or using the prior art, and are not described herein.

Claims

1. A pea further processing pretreatment system, comprising:

2. The pea deep-processing pretreatment system of claim 1, further comprising a pea receiving unit comprising a discharge hopper, an upper port of the discharge hopper covered with a discharge grid, a bottom outlet of the discharge hopper connected to an inlet of a first scraper conveyor, an outlet of the first scraper conveyor connected to a lower inlet of the first bucket elevator.

3. The pea deep-processing pretreatment system of claim 1, wherein an outlet of each of the soak solution circulation pumps is connected to a tube side inlet of a soak solution heater, and a tube side outlet of each of the soak solution heaters is connected to a soak solution inlet of a same stage soak tank and a next stage soak tank, respectively.

4. A pea further processing pre-treatment system according to claim 3, wherein the tube side outlet of each of said soak solution heaters is further connected to a soak solution drain tube, respectively.

5. The pea further processing pretreatment system of claim 1, wherein a bottom outlet of each of the soaking tanks is connected to an inlet of a soaking discharge buffer tank, respectively, the outlet of the soaking discharge buffer tank being transported to a subsequent unit by a soaking discharge pump.

6. The pea further processing pretreatment system according to claim 5, wherein the bottom outlet of each of said soaking tanks is further connected to a process water pipe from a subsequent unit, respectively.

7. Pea deep-processing pretreatment system according to any of the claims 2 to 6, wherein the pea cleaning unit, the pea storage unit, the pea metering and stoning unit and the pea impurity removal and classification unit are respectively provided with a dust removal device.