CN101824659B - Method and equipment for automatically cooking silkworm cocoons - Google Patents

Method and equipment for automatically cooking silkworm cocoons Download PDF

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Publication number
CN101824659B
CN101824659B CN2010101584492A CN201010158449A CN101824659B CN 101824659 B CN101824659 B CN 101824659B CN 2010101584492 A CN2010101584492 A CN 2010101584492A CN 201010158449 A CN201010158449 A CN 201010158449A CN 101824659 B CN101824659 B CN 101824659B
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cocoon
cooking
tank
silk
process tank
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CN2010101584492A
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CN101824659A (en
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潘大东
周文祥
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GUANGXI LI SHENG COCOON SILK CO Ltd
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GUANGXI LI SHENG COCOON SILK CO Ltd
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Abstract

The invention relates to an intelligent method and equipment for automatically cooking silkworm cocoons, which can effectively improve the cooking uniformity of silkworm cocoons. The equipment used for realizing the method of the invention for automatically cooking silkworm cocoons comprises a silkworm cocoon treatment tank, a top cover of the treatment tank and a silkworm cocoon storage tank and is characterized in that a water replenishing tank is also arranged between the silkworm cocoon treatment tank and the silkworm cocoon storage tank. By variably setting different technological parameters, operating man-machine conversation by a touch screen and automatically controlling the time, the water level and the temperature for soaking, steaming and cooking cocoons by a computer and an actuating mechanism, the invention completes the whole processes of feeding, permeating, cocoon steaming, cocoon cooking, cooling protection and cocoon forming in the same barrel, changes the traditional mode of constant action of each section in the traditional circulating cocoon cooking machine, and overcomes the defects of high operation requirements on workers, untimely manual operation and unstable cocoon cooking quality.

Description

The automatically cooking silkworm cocoons method and apparatus
Technical field
The present invention relates to the Textile Engineering technical field, particularly relate to a kind of silkworm cocoons-boiling method and equipment.
Background technology
The cocoon cooking operation is a very important operation of throwing factory.Normally utilize circulating cocoon cooking equipment to finish, it comprises the cocoon portion that adds, dipping portion, preheating section, the seeping at high temperature section, the infiltration low-temp. portion, boiling portion, adjustment part and outlet low-temp. portion etc., silk cocoon is through infiltration, after the The pre-heat treatment, portion boils in boiling, in cocoon cooking process, how to improve silkworm cocoon reelability, make that silk dissociates in proper order when continuing silk, therefore, cocoon cooking suitably whether, to separating easypro quality in the filature process, the height of cleanliness factor has direct influence, cocoon cooking is irregular can boil (giving birth in cocoon layer is ripe) outward by the generation table, sheet boils (boiling variant between cocoon and the cocoon), spot boils disadvantages such as (cocoon grain different parts boil irregular), if cocoon boils not yet done or spot boils, can obviously increase the lopps of raw silk, even silk is split in generation; And cocoon boils overdonely, will increase new continuous bar class, influences inherent qualities such as raw silk cleaning, cleanliness.So when cocoon boils suitably, can make the swelling of cocoon layer silk gum appropriateness, the silk cocoon suction is suitable, thereby keeps certain filature winding speed and reeling tension, silk stretches during filature, and each root silk can be deadlocked mutually preferably, and obvolvent is good, and the class joint is few, and the raw silk cleanliness factor is just high.The boiling part device of prior art adopts is that the multichannel bend pipe directly sprays the high-temperature steam requirement that reaches a high temperature, and steam all to be baffle reflections by boiling portion bottom spray to the cocoon cage, but because the temperature around in the cure bag is inconsistent, steam can't form a circulation, cause the silk cocoon boiling degree inequality in the cocoon cage, and the steam that reflection comes up has steam droplets water, making the silk cocoon of cocoon cage bottom be dripped by steam adheres to, and cause this part silk cocoon surface local overdone, then the deadlocked point of fibre is impaired, occur being on the point of in the continuous wire process in road after this just makes and hang, the thread that falls increases and raw material rope folding increases, thus the production efficiency and the raw silk quality of the continuous silk of influence.Therefore, people have designed the technology and the device thereof of this new cocoon cooking again, the boiling part device of attempting to change the cocoon cooking machine of prior art exists the silk cocoon in cure bag non-uniform temperature and the cocoon cage easily to be dripped by steam and adheres to and the overdone problem that is unfavorable for continuous silk in surface, for example:
1. Chinese patent: a kind of digesting technoloy of cocoon cooking and device thereof, application number: 200910034855, the applying date: 2009.09.10, publication number: CN101638809, open day: 2010.02.03, applicant: University Of Suzhou, address: No. 199, Renai Road, Suzhou Industrial Park District, Suzhou City, Jiangsu Province, inventor: Chen Qingguan; Ding Zhongjian, the summary: this disclosure of the Invention a kind of cocoon cooking process and device thereof, the particularly a kind of method for regulating temperature and device thereof that can improve the cocoon cooking machine boiling portion of boiling the uniformity of silk cocoon effectively.The boiling portion of the cocoon cooking machine that this invention provides, length is 15.5 cages, is divided into 2~5 sections heater and supercharging device are set respectively; Bottom at each section of boiling portion has water discharge outlet, connects drainpipe 12; Supercharging device is connected with drainpipe by an end of U-shaped pipe 13, and the straight tube 14 that another termination height is 250mm~1000mm constitutes.By supercharging device, can effectively improve the pressure of boiling portion, make boiling portion maximum temperature improve more than 0.5 ℃.This invention can make the thread rate that falls of internal layer in the silk cocoon after the boiling significantly reduce, and helps boiling evenly of silk cocoon, improves the reelability percentage of raw material cocoon.
2. Chinese patent: the boiling part device of cocoon cooking machine, application number: 200910101962, the applying date: 2009.08.27, publication number: CN101629321, open day: 2010.01.20, applicant: virgin Hua Bo, address: Yinzhou District Tang Xi Zhen Tong village, Ningbo City, Zhejiang Province bridge Ningbo development mechanical ﹠ electronic equipment corporation, Ltd, inventor: virgin Hua Bo, summary: a kind of boiling part device of cocoon cooking machine, be provided with the hook 16 of some symmetries on 10 liang of straight walls of cure bag along its length, every pair of hook 16 lays respectively on the two straight walls, and all is mounted with swash plate 3 on every pair of hook 16, and all swash plates are equipped with the equidirectional flanging of twice in two ends about in the of 3, all swash plate 3 incline direction unanimities, and all swash plate 3 bottoms all are against the upper surface of reflecting plate 6.This invention is owing to be provided with the guiding swash plate above steam bend pipe, when being mingled with steam that steam drips and moving to the swash plate position, because of the effect of swash plate makes steam continue up to move along swash plate, and steam drips along swash plate and walks downward, and can reach that steam separates with steam droplets water and steam drips is difficult for adhering to the silk cocoon purpose; Simultaneously swash plate and horizontal plane have angle, and steam is formed in cure bag circulate, so the boiling indoor temperature is more even, make that silk cocoon boils in the cocoon cage evenly to be beneficial to filature.
Yet, find in the technology of the inventor more than realizing, the one, the temperature of cocoon cooking is to lean on operator's experience to realize, like this, when running into not too skilled direct labor, just can not hold the temperature of water and steam well, have a strong impact on the quality of product, the 2nd, in above digesting apparatus, the workshop section head of boiling, generally need a plurality of chambers could finally finish whole process flow, so floor space is bigger, both wasted the work-yard, increased operating personnel's quantity again, had a strong impact on production efficiency, so, how to improve the cooked cocoon quality, reduce cost, raise labour efficiency, be the problem that throwing industry and researcher are concerned about always.
Summary of the invention
The purpose of this invention is to provide automatically cooking silkworm cocoons method and apparatus a kind of intelligence, that floor space is little, efficient is high, simple in structure.
The present invention realizes in following mode:
The method of automatically cooking silkworm cocoons comprises charging, infiltration, steaming cocoon, cocoon cooking, sub-cooled and goes out cocoon, it is characterized in that: concrete processing step is as follows:
1. charging: the top cover with autocontrol valve switching process tank, adopt the hand feed mode;
2. infiltration: with the infiltration of cryogenic vacuum dipping, the water level of silk cocoon process tank is 1/2~2/3 of a tank body volume, and the vacuum infiltration temperature is 15~25 ℃, and the time is 4~5min (contain and vacuumize and the water at low temperature recovery time);
3. steam cocoon: steaming the cocoon temperature with automatic control is 80~92 ℃, and the time is 3~4min;
4. cocoon cooking: the water level of silk cocoon process tank is 1/2~2/3 of a tank body volume, and the temperature of cocoon cooking is at 45~55 ℃ of scopes (than low 10 ℃ of common process), and the time is 3~4min;
5. cooling: the water level of silk cocoon process tank is 1/2~2/3 of a tank body volume, and the cooling protection temperature is a normal temperature, and the time is 2~3min;
6. go out cocoon: silk cocoon enters holding vessel, handles after the holding vessel outlet transports the filature operation to.
The method of above-described automatically cooking silkworm cocoons, realization immersion, steaming cocoon and cocoon cooking operation are all finished in same silk cocoon process tank, must not pass through circulating cocoon cooking equipment, and the overall time is 12~20min.
The method of above-described automatically cooking silkworm cocoons can adopt computer control to soak, steam time, water level and the temperature of cocoon and cocoon cooking, and by the human-computer dialogue touch screen operation.
The equipment that above-described automatically cooking silkworm cocoons method is adopted, comprise silk cocoon process tank, process tank top cover and silk cocoon holding vessel, described equipment also is provided with replenisher tank between silk cocoon process tank and silk cocoon holding vessel, be connected with hydraulic system on silk cocoon process tank and the top cover, the switching of silk cocoon process tank realizes with the solenoid control hydraulic jack.
Above-described silk cocoon process tank and replenisher tank are equipped with several level sensors and/or plurality of temperature sensor.
In the above-described replenisher tank steam-heating pipe being installed, mainly is in order to improve silk cocoon process tank temperature to boil water, particularly winter rapidly, can to shorten the time of steaming cocoon and cocoon cooking.
Above-described replenisher tank is one or several.
The invention has the beneficial effects as follows:
1. control time, water level and the temperature of immersion, steaming cocoon and cocoon cooking automatically by different technical parameters conversion setting, human-computer dialogue touch screen operation, computer and executing agency, in same cylindrical shell (silk cocoon process tank), finish charging, soaked infiltration, steamed cocoon, cocoon cooking, cooled off, gone out the overall process of cocoon, changed the changeless traditional mode of each section effect of circulating in the past cocoon cooking machine, solved and require operating worker level height, manually-operated untimely, the unsettled drawback of cocoon cooking quality.
2. can cooperate connection with automatic silk reeling machine, directly supply filature with suitable cooked cocoon, established sturdy technology basis, first road for production high-grade WHITE STEAM FILATURE YARNS, played revolutionary effect for the scientific management of whole filature industry and the further raising of filature production automation degree.
3. adopted automatically cooking silkworm cocoons Apparatus for () and method therefor of the present invention, the quality index and the level of ripe cocoon are greatly improved:
1. reelability percentage has improved 5% on year-on-year basis;
2. the reel silk from cocoons folding is little 8.3kg, has reduced by 2.8% on year-on-year basis;
3. separate the per unit area yield that relaxes and improved 4 grams (the unit unit-hour output improves 20 grams) for hundred meters;
4. cleanliness factor has improved 2.0 fens;
5. the raw silk grade is stabilized between the 4A-5A level.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the schematic diagram of present device structure.
Description of reference numerals:
Top cover 1, sensor 2, steam jacket 3, silk cocoon process tank 4, silk cocoon holding vessel 5, replenisher tank 6, steam-heating pipe 7, steam pipeline 8.
The specific embodiment
Shown in attached, automatically cooking silkworm cocoons equipment of the present invention comprises top cover 1, sensor 2, steam jacket 3, silk cocoon process tank 4, silk cocoon holding vessel 5, replenisher tank 6, steam-heating pipe 7 and steam pipeline 8, between silk cocoon process tank 4 and silk cocoon holding vessel 5, also be provided with replenisher tank 6, be connected with hydraulic system on the top cover 1 on the silk cocoon process tank 4, silk cocoon process tank 4 is equipped with several water levels and temperature sensor 2, steam-heating pipe 7 is fastened in the silk cocoon holding vessel 5 by steam jacket 3, and steam pipeline 8 leads to silk cocoon process tank 4 and replenisher tank 6 respectively.
Below in conjunction with embodiment the course of work of the present invention is described:
Embodiment 1
Adopt the mulberry cocoon digesting technoloy of present device (XJ-08 type intelligence automatically cooking silkworm cocoons machine): the first step, connect power supply, the whole processes of input cocoon cooking, press touch-screen, control hydraulic system is opened the top cover 1 of silk cocoon process tank 4, and the operator pours an amount of mulberry cocoon raw material into, close top cover 1, replenisher tank 6 water inlets, it is 70% of tank body height that level sensor 2 is regulated water level, steam enters silk cocoon process tank 4 by steam pipeline 8, regulate the vacuum infiltration temperature and reach 25 ℃, soak operation; Second step was carried out cocoon cooking, and under the induction of temperature sensor 2, the temperature of cocoon cooking is at 45-55 ℃ of scope (than low 10 ℃ of common process); In the 3rd step, steam cocoon.Steam enters silk cocoon process tank 4 by steam pipeline 8, and Electronic Control is steamed the cocoon temperature in 90 ℃ (than low 10 ℃ of common process); The 4th step, cooling.Opening replenisher tank 6, is 35 ℃ by sensor 2 control chilling temperatures; In the 5th step, go out cocoon.The mulberry cocoon falls into the bottom by silk cocoon holding vessel 5, and after the abundant drop of mulberry cocoon removed unnecessary moisture content, the operator was carried to the filature workshop with the mulberry cocoon, carried out next process.Continue to press touch-screen, control hydraulic system is opened the top cover 1 of silk cocoon process tank 4 ..., so circulation is carried out the digesting technoloy of another batch mulberry cocoon raw material repeatedly.
Embodiment 2
Adopt the mulberry cocoon digesting technoloy of present device (XJ-08B type intelligence automatically cooking silkworm cocoons machine): the first step, connect power supply, the whole processes of input cocoon cooking, press touch-screen, control hydraulic system is opened the top cover 1 of silk cocoon process tank 4, and the operator pours an amount of mulberry cocoon raw material into, close top cover 1, replenisher tank 6 water inlets, it is 60% of tank body height that level sensor 2 is regulated water level, steam enters silk cocoon process tank 4 by steam pipeline 8, regulate the vacuum infiltration temperature and reach 20 ℃, soak operation; Second step was carried out cocoon cooking, and under the induction of temperature sensor 2, the temperature of cocoon cooking is at 45-55 ℃ of scope (than low 10 ℃ of common process); In the 3rd step, steam cocoon.Steam enters silk cocoon process tank 4 by steam pipeline 8, and Electronic Control is steamed the cocoon temperature in 88 ℃ (than low 12 ℃ of common process); The 4th step, cooling.Opening replenisher tank 6, is 30 ℃ by sensor 2 control chilling temperatures; In the 5th step, go out cocoon.The mulberry cocoon falls into the bottom by silk cocoon holding vessel 5, and after the abundant drop of mulberry cocoon removed unnecessary moisture content, the operator was carried to the filature workshop with the mulberry cocoon, carried out next process.Continue to press touch-screen, control hydraulic system is opened the top cover 1 of silk cocoon process tank 4 ..., so circulation is carried out the digesting technoloy of another batch mulberry cocoon raw material repeatedly.

Claims (4)

1. the method for automatically cooking silkworm cocoons, comprise charging, infiltration, steaming cocoon, cocoon cooking, sub-cooled and go out cocoon, it is characterized in that: realize that immersion, steaming cocoon and cocoon cooking operation all are to finish in same silk cocoon process tank (4), the overall time is 12~20min, and concrete processing step is as follows:
1. charging: the top cover with autocontrol valve switching process tank, adopt the hand feed mode;
2. infiltration: with the infiltration of cryogenic vacuum dipping, the water level of silk cocoon process tank (4) is 1/2~2/3 of a tank body volume, and the vacuum infiltration temperature is 15~25 ℃, and total time is 4~5min;
3. steam cocoon: steaming the cocoon temperature is 80~92 ℃, and the time is 3~4min;
4. cocoon cooking: the water level of silk cocoon process tank (4) is 1/2~2/3 of a tank body volume, and the temperature of cocoon cooking is at 45~55 ℃, and the time is 3~4min;
5. cooling: the water level of silk cocoon process tank (4) is 1/2~2/3 of a tank body volume, and the cooling protection temperature is a normal temperature, and the time is 2~3min;
6. go out cocoon: silk cocoon enters holding vessel (5), handles after the holding vessel outlet transports the filature operation to.
2. the method for automatically cooking silkworm cocoons according to claim 1 is characterized in that: adopt computer control to soak, steam time, water level and the temperature of cocoon and cocoon cooking, and by the human-computer dialogue touch screen operation.
3. the equipment that automatically cooking silkworm cocoons method according to claim 1 is adopted, comprise silk cocoon process tank (4), top cover (1) and silk cocoon holding vessel (5), it is characterized in that: between silk cocoon process tank (4) and silk cocoon holding vessel (5), be provided with the replenisher tank (6) that silk cocoon process tank (4) is carried out moisturizing, steam-heating pipe (7) is installed in the replenisher tank (6);
Be connected with hydraulic system on silk cocoon process tank (4) and the top cover (1), the switching of silk cocoon process tank (4) realizes with the solenoid control hydraulic jack;
Silk cocoon process tank (4) and replenisher tank (6) are equipped with several level sensors and/or plurality of temperature sensor.
4. the equipment that automatically cooking silkworm cocoons method according to claim 3 is adopted is characterized in that: described replenisher tank (6) is one or several.
CN2010101584492A 2010-04-28 2010-04-28 Method and equipment for automatically cooking silkworm cocoons Expired - Fee Related CN101824659B (en)

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CN102677181A (en) * 2012-05-17 2012-09-19 江苏丝乡智能设备有限公司 Automatic vacuum scouring device
CN102851749B (en) * 2012-09-11 2015-09-16 安岳县振兴实业有限公司 A kind of silk cocoon vacuum infiltration treating apparatus and method
CN103205817B (en) * 2013-02-28 2015-12-02 杭州金利丝业有限公司 A kind of silk preparation method
CN103993362A (en) * 2014-04-22 2014-08-20 安徽天锦丝业有限公司 Waste silkworm silk reel-off process
CN104451897A (en) * 2014-11-14 2015-03-25 安徽省广德新丰丝绸有限公司 White steam filature yarn pre-treatment technology before production
CN104947354A (en) * 2015-06-16 2015-09-30 苏州维度丝绸有限公司 Real silk soaking pond
CN104894746B (en) * 2015-06-30 2017-08-01 广西立盛茧丝绸有限公司 A kind of manufacture method of the continuous piece of silkworm
CN105483836B (en) * 2016-01-27 2018-05-29 惠安县马巢生态农业有限公司 A kind of Full-automatic sterilizing silk cocoon spinning machine
CN110644060A (en) * 2019-09-27 2020-01-03 广西柳城县鸿艺丝绸有限公司 Automatic vacuum infiltration device
CN112359428B (en) * 2020-11-19 2022-09-13 广西桂华丝绸有限公司 Vacuum humidifying device for filament sheets
CN114921856B (en) * 2022-06-09 2023-06-23 四川省丝绸科学研究院有限公司 Cocoon cavity water-jetting and cocoon layer water-content control method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6059109A (en) * 1983-09-08 1985-04-05 Nissan Motor Co Ltd Method of boiling cocoons
CN201406484Y (en) * 2009-05-18 2010-02-17 沈冠东 Decompression and compression automatic cocoon cooking machine

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Denomination of invention: Method and equipment for automatically cooking silkworm cocoons

Effective date of registration: 20160927

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Pledgee: China Co. truction Bank Corp Nanning hi tech sub branch

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