LU500089B1 - Extrusion gelatinization device and system - Google Patents
Extrusion gelatinization device and system Download PDFInfo
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- LU500089B1 LU500089B1 LU500089A LU500089A LU500089B1 LU 500089 B1 LU500089 B1 LU 500089B1 LU 500089 A LU500089 A LU 500089A LU 500089 A LU500089 A LU 500089A LU 500089 B1 LU500089 B1 LU 500089B1
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- extrusion
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- steam
- spiral blade
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- 238000001125 extrusion Methods 0.000 title claims abstract description 112
- 239000000463 material Substances 0.000 claims abstract description 100
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- 230000007246 mechanism Effects 0.000 claims abstract description 22
- 238000007599 discharging Methods 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims description 14
- 238000010008 shearing Methods 0.000 claims description 12
- 230000003247 decreasing effect Effects 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 229920002472 Starch Polymers 0.000 description 13
- 235000019698 starch Nutrition 0.000 description 13
- 239000008107 starch Substances 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 9
- 241000209094 Oryza Species 0.000 description 4
- 235000007164 Oryza sativa Nutrition 0.000 description 4
- 235000013312 flour Nutrition 0.000 description 4
- 235000009566 rice Nutrition 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920002261 Corn starch Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 239000008120 corn starch Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 235000012438 extruded product Nutrition 0.000 description 1
- 239000007863 gel particle Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
- A23L29/00—Foods or foodstuffs containing additives; Preparation or treatment thereof
- A23L29/30—Foods or foodstuffs containing additives; Preparation or treatment thereof containing carbohydrate syrups; containing sugars; containing sugar alcohols, e.g. xylitol; containing starch hydrolysates, e.g. dextrin
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
- A23L5/00—Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
- A23L5/10—General methods of cooking foods, e.g. by roasting or frying
- A23L5/13—General methods of cooking foods, e.g. by roasting or frying using water or steam
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
- A23L7/00—Cereal-derived products; Malt products; Preparation or treatment thereof
- A23L7/10—Cereal-derived products
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23P—SHAPING OR WORKING OF FOODSTUFFS, NOT FULLY COVERED BY A SINGLE OTHER SUBCLASS
- A23P30/00—Shaping or working of foodstuffs characterised by the process or apparatus
- A23P30/20—Extruding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/51—Screws with internal flow passages, e.g. for molten material
- B29C48/515—Screws with internal flow passages, e.g. for molten material for auxiliary fluids, e.g. foaming agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/53—Screws having a varying channel depth, e.g. varying the diameter of the longitudinal screw trunk
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/535—Screws with thread pitch varying along the longitudinal axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/83—Heating or cooling the cylinders
- B29C48/832—Heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/84—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders by heating or cooling the feeding screws
- B29C48/845—Heating
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Nutrition Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Grain Derivatives (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides an extrusion gelatinization device and system, which includes a heating cavity, an extrusion cavity and a screw. The heating cavity has a steam inlet and a steam outlet. The extrusion cavity is located in the heating cavity, and has a feeding opening and a discharging opening. The screw has a hollow structure and can rotate in a circumferential direction, and includes a driving segment and an operating segment, the operating segment is located in the extrusion cavity, used for matching with the cavity wall of the extrusion cavity when the screw rotates, so as to extrude and gelatinize material while conveying the material from the feeding opening to the discharging opening, the driving segment extends out of the extrusion cavity and has an opening on its end for leading to an external steam source and connecting with an external rotation driving mechanism, the operating segment is provided with a through hole for steam to escape into the heating cavity. Therefore, the material in the extrusion cavity can be greatly uniformly heated at a very high heating rate under function of the above-mentioned double-layered steam, ensuring the material?s gelatinization under large capacity.
Description
BL-5232
TECHNICAL FIELD OF THE INVENTION The invention relates to food processing, in particular to an extrusion gelatinization device and system.
DESCRIPTION OF THE PRIOR ART Extrusion technology is a technology that integrates multiple independent operations such as mixing, conveying, heating, cooking and pressurizing, and widely applied to food processing. For example, in some starch-based foods, the starch-based material is first concocted with water to obtain a wet material containing a certain amount of moisture, and then enters the screw extruder for convergent extrusion and gelatinization, or is steamed and gelatinized in advance before entering the extruder and then enters the extruder to be gelatinized and formed .
The existing extrusion gelatinization device mostly uses single-screw or twin-screw, with its process that can generally be divided into three stages. The first stage is the material conveying stage, where after entering the extrusion gelatinization device, the material is conveyed forward under the friction force caused by continuously rotating screw. The second stage is the gelatinization stage, where with temperature and pressure rising and under such function as material being extruded and sheared by a screw and a gelatinization cavity, the material is gradually gelatinized. The third stage is the discharging stage, where with temperature further rising and starch, fat, protein and the like changing and reacting, and the materials are uniformly discharged through the mould channel. Based on the above three stages, in order to achieve a better gelatinization, the current extrusion gelatinization device generally adopts such method as increase the length of the extrusion spiral or the diameter of the extrusion gelatinization cavity, but this mothed requires higher energy consumption, as well as such extrusion gelatinization device’s heat is mainly derived from shearing friction and external function gelatinization, so heating is too single. For some starch-based extruded products, when the output increases, the product gelatinization will be insufficient, ultimately affecting 1
BL-5232 product quality. For example, in the processing of extruding rice flour, the current production capacity is only 200kg/h. If increasing the production capacity, the product’s gelatinization will be drastically reduced, resulting in a sharp drop in product quality.
SUMMARY OF THE INVENTION In order to solve such technical problem that above-mentioned shortcomings exist in the prior art, the invention provides an extrusion gelatinization device, which can greatly increase the production capacity while ensuring the material’s gelatinization, correspondingly, further provides a system having the device.
The technical solutions adopted to solve the technical problems of the invention are as follows: An extrusion gelatinization device according to the invention which includes a heating cavity, an extrusion cavity and a screw.
The heating cavity has a steam inlet and a steam outlet.
The extrusion cavity is located in the heating cavity, and has a feeding opening and a discharging opening, both of which extend out of the heating cavity.
The screw has a hollow structure and can rotate in a circumferential direction, and includes a driving segment and an operating segment, the operating segment is located in the extrusion cavity, used for matching with the cavity wall of the extrusion cavity when the screw rotates, so as to extrude and gelatinize material while conveying the material from the feeding opening to the discharging opening, the driving segment extends out of the extrusion cavity and has an opening on its end for leading to an external steam source and connecting with an external rotation driving mechanism, the operating segment is provided with a through hole for steam to escape.
Preferably, the operating segment of the screw includes a rod body and a spiral blade. The spiral blade is provided on the outer wall of the rod body and includes a first spiral blade and a second spiral blade.
The first spiral blade has an extrusion spiral structure, which is used for conveying materials while the screw rotates and extruding the materials to help to gelatinize the materials. The first spiral blade includes a plurality of first spiral blade segments distributed on the rod 2
BL-5232 body.
The second spiral blade has a blade spiral structure, which is used for conveying materials while the screw rotates and shearing the materials to help to gelatinize the materials. The second spiral blade includes a plurality of second spiral blade segments distributed on the rod body.
A plurality of first spiral blade segments and a plurality of second spiral blade segments are alternately arranged on the rod along the conveying direction of the material.
Preferably, the outer diameter of the rod body of screw increases along the conveying direction of the material, and the distance between the crest of the spiral blade and the inner wall of the extrusion cavity is consistent along the conveying direction of the material.
Preferably, the pitch of screw and profile height of the first spiral blade are sequentially decreased along the conveying direction of the material.
Preferably, the pitch of screw and profile height of the second spiral blade are sequentially decreased along the conveying direction of the material.
Preferably, the head of the first spiral blade segment is provided on the most front segment of the rod body along the conveying direction of the material, and the corresponding rod body length is 1/5 - 1/4 of the entire operating segment.
Preferably, the through hole is provided with multiple through holes which are arranged in an array on the front segment of the rod body along the conveying direction of the material. The length of the rod body with through holes is 1/3-1/2 of the entire operating segment.
Preferably, the discharging opening is an inverted U-shaped tube, and the length of the inverted U-shaped tube in the heating cavity is 1/3-1/2 of the inverted U-shaped tube.
An extrusion gelatinization system according to the invention which includes a rotation driving mechanism, a steam source and an above-mentioned extrusion gelatinization device.
The rotation driving mechanism is in transmission connection with the driving segment, and is used to drive the screw to rotate.
The steam source is in dynamic sealing communication with the driving segment, and is used to deliver steam to the inner cavity of the screw.
The steam source is further connected to the steam inlet of the heating cavity, and is used to deliver high-pressure steam into the heating cavity.
3
BL-5232 Preferably, the steam pressure delivered from the steam source is 0.4-0.7Mpa.
In the invention, the material in the extrusion cavity with inner and outer double-layered steam and under function of mechanical energy of screw extrusion can be heated at greatly high rate and in greatly high uniformity by installing the extrusion cavity in the heating cavity and setting the extrusion gelatinization screw as a hollow structure connected with the steam source, thereby greatly increasing the material’s gelatinization in the unit flow, therefore, the invention can ensure the material’s gelatinization without increasing the length of screw and the volume of extrusion barrel while greatly increasing the production capacity.
The beneficial effects are as follows:
1. As there is a hollow structure in the screw, the front segment of which is provided with small holes that communicate with inside and outside in the invention, after injecting high pressure steam into the screw, the high pressure steam is sprayed from the small holes, so that the starch-based materials in the extrusion cavity are treated under function of steam gelatinization, shearing gelatinization and rotating friction gelatinization, and high-temperature steam is allowed to quickly combine with rice flour by rapidly shearing in organic combination with steam. Moreover, the high-speed switching realizes extremely high energy transfer, which improves the material’s gelatinization in the unit flow, and can greatly increase the production capacity while ensuring the material’s gelatinization.
2. As extrusion spiral and shearing spiral are alternately combined with the screw, the diameter of which gradually increases and the pitch and groove depth of which gradually decrease in the invention, the front segment of screw functions as a role of mixing and conveying materials, and the shearing blade spiral in the screw will cut the material in conveying into small particles, which quickly contact with the sprayed high-pressure steam to help to gelatinize the material in the conveying stage. As the diameter of the screw increases, the pitch of screw and the depth of the screw groove decrease, and the material conveyed to the rear end of the screw enters a small spiral flow channel with sufficient friction, so as to be thoroughly matured and gelatinized, ensuring the material’s gelatinization under large capacity.
3. The invention has characteristics such as reasonable structure, stable performance, high extrusion strength, and long service life. Without increasing the length of screw and the volume of extrusion barrel, the invention can effectively improve the rapid extrusion gelatinization of 4
BL-5232
BRIEF DESCRIPTION OF THE DRAWINGS FIG.1 is a schematic diagram of the extrusion gelatinization device provided by Embodiment 1 of the invention.
FIG.2 is a cross-segmental schematic diagram of the extrusion cavity and the screw segment therein provided by Embodiment 1 of the invention.
Wherein, 1-heating cavity; 2-extrusion cavity; 21- feeding opening; 22-discharging opening; 3-screw rod; 31-first spiral blade segment; 32-second spiral blade segment; 33-through hole; 4-base; 5- rotation driving mechanism; 6-steam pressure gauge.
DETAILED DESCRIPTION OF THE INVENTION The technical solutions according to the invention will be described clearly and completely below in combination with the drawings in the invention.
An extrusion gelatinization device according to the invention which includes a heating cavity, an extrusion cavity and a screw, wherein the heating cavity has a steam inlet and a steam outlet.
The extrusion cavity is located in the heating cavity, and has a feeding opening and a discharging opening, both of which extend out of the heating cavity, The screw has a hollow structure and can rotate in a circumferential direction, and includes a driving segment and an operating segment, the operating segment is located in the extrusion cavity, used for matching with the cavity wall of the extrusion cavity when the screw rotates, so as to extrude and gelatinize material while conveying the material from the feeding opening to the discharging opening, the driving segment extends out of the extrusion cavity and has an opening on its end for leading to an external steam source and connecting with an external rotation driving mechanism, the operating segment is provided with a through hole for steam to escape.
An extrusion gelatinization system according to the invention which includes a rotation driving mechanism, a steam source and an above-mentioned extrusion gelatinization device.
The rotation driving mechanism is in transmission connection with the driving segment, and is used to drive the screw to rotate,
BL-5232 “The steam source is in dynamic sealing communication with the driving segment, and is used to deliver steam to the inner cavity of the screw, The steam source is further connected to the steam inlet of the heating cavity, and is used to deliver high-pressure steam into the heating cavity.
Embodiment 1: As shown in FIG. 1 and FIG.2, this embodiment provides an extrusion gelatinization device, which is mainly used for the extruding and gelatinizing starch-based materials. It includes: a base 4, a heating cavity 1, an extrusion cavity 2 and a screw 3.
The heating cavity 1 fixed on the base 1 is a hollow sandwiching heating cavity and has a steam inlet and a steam outlet. The steam enters the heating cavity 1 from the steam inlet to indirectly heat the materials in the extrusion cavity 2, then flows back to the source of steam to save energy via the pipe connected to the steam outlet.
The extrusion cavity 2 is the inner cavity of the heating cavity 1, which is formed by the inner wall of the heating cavity 1. The extrusion cavity 2 has a feeding opening 21 and a discharging opening 22 which are separately arranged on both ends of the extrusion cavity 2 along the axial direction of the screw 3 and extend out of the heating cavity 1.
The screw 3 has a hollow structure and can rotate in a circumferential direction, and includes a driving segment and an operating segment, the operating segment is located in the extrusion cavity 2, used for matching with the cavity wall of the extrusion cavity 2 when the screw 3 rotates, so as to extrude and gelatinize material while conveying the material from the feeding opening 21 to the discharging opening 22, the driving segment extends out of the extrusion cavity 2 and has an opening on its end for leading to an external steam source and connecting with an external rotation driving mechanism, the operating segment is provided with a through hole 33 for steam to escape into the extrusion cavity 2.
Thus, the extrusion gelatinization screw 3 is set as a hollow structure connected to the steam source by forming the extrusion cavity 2 in the heating cavity 1,after high pressure steam is injected into the heating cavity 1 and the hollow screw, the high-pressure steam in the heating cavity 1 indirectly heats the material in the extrusion cavity 2. The steam entering the screw is sprayed from the through the hole 33 on the screw and enters the extrusion cavity 2 to directly heat the material. The material in the extrusion cavity 2 can be greatly uniformly heated at a 6
BL-5232 very high heating rate under function of the above-mentioned double-layered steam. Therefore, under multiple function of steam gelatinization, shearing gelatinization and rotating friction gelatinization, the material's gelatinization per unit flow is greatly increased, so this device can increase the production capacity without increasing the length of the screw and the volume of the extrusion barrel, while ensuring the material’s gelatinization.
Specifically, the external rotation driving mechanism may include a motor and a gear deceleration transmission mechanism. The motor is put in the transmission connection with the input gear of the gear deceleration transmission mechanism, and then the driving segment is put in transmission connection with the output gear of the gear deceleration transmission mechanism, therefore, the screw can be driven to rotate when the motor is started.
Then, the end of the driving segment of the screw 3 is connected to an external steam source through a pipe, and the driving segment is in dynamic sealing connection with the pipe, so that the screw can rotate relative to the steam connection pipe and ensure the steam not to leak.
A steam pressure control valve is provided in the front segment of the steam inlet, which can adjust the pressure of the steam passing through the heating cavity 1.
In this embodiment, the operating segment includes a rod body and a spiral blade. The spiral blade is provided on the outer wall of the rod body and includes a first spiral blade and a second spiral blade.
The first spiral blade has an extrusion spiral structure, which is used for conveying materials while the screw 3 rotates and extruding the materials to help to gelatinize the materials. The first spiral blade includes a plurality of first spiral blade segments 31 distributed on the rod body.
The second spiral blade has a blade spiral structure, which is used for conveying materials while the screw 3 rotates and shearing the materials to help to gelatinize the materials. The second spiral blade includes a plurality of second spiral blade segments 32 distributed on the rod body.
A plurality of first spiral blade segments 31 and a plurality of second spiral blade segments 32 are alternately arranged on the rod along the conveying direction of the material.
Thus, the starch-based materials in the extrusion cavity are processed under multiple 7
BL-5232 function of steam gelatinization, shearing gelatinization and rotating friction gelatinization, especially high-temperature steam is allowed to quickly combine with rice flour by rapidly shearing in organic combination with steam. Moreover, high-speed switching realizes extremely high energy transfer, thereby further increasing the material’s gelatinization per unit flow.
An extrusion spiral blade commonly used in the art may be adopted for the first spiral blade segment 31. The second spiral blade segment 32 may adopt a structure in which a cutting blade is fixed on the spiral blade body, so as to realize cutting the material in conveying into small particles while conveying material.
In this embodiment, the outer diameter of the rod body increases along the conveying direction of the material, preferably increases at length-diameter ratio of 20:1, and the distance between the crest of the spiral blade and the inner wall of the extrusion cavity 2 is consistent along the conveying direction of the material.
In this embodiment, the pitch of screw and profile height of the first spiral blade are sequentially decreased along the conveying direction of the material.
In this embodiment, the pitch of screw and profile height of the second spiral blade are sequentially decreased along the conveying direction of the material.
That is, in the case that the distance between the crest of the spiral blade and the inner wall of the extrusion cavity 2 is ensured to be consistent along the conveying direction of the material, making sure that the materials can be transferred smoothly without jamming and the like, the screw operating segment is set as a special-shaped screw segment with gradually increasing diameter and gradually decreasing pitch of screw and profile height of crest, so as to make the front operating segment function as a role of mixing and conveying materials, so the second spiral blade with shearing blades in the screw cut the material in conveying into small particles, which quickly contact with the sprayed high-pressure steam to help to gelatinize the material in the conveying stage. As the diameter of the screw increases, the pitch of screw and the profile height of crest decrease, and the material conveyed to the rear end of the screw enters a small spiral flow channel with sufficient friction, so as to be thoroughly matured and gelatinized, ensuring the material’s gelatinization under large capacity.
In this embodiment, the head of the first spiral blade segment 31 is provided on the most front segment of the rod body along the conveying direction of the material, and the 8
BL-5232 corresponding rod body length is 1/5 - 1/4 of the entire operating segment. After the material enters, it is initially gelatinized at this stage and gradually pushed back into the subsequent extrusion stage.
Preferably, the segment sum of the first spiral blade segment 31 and the second spiral blade segment 32 is 5-7. The first spiral blade 31 extrudes and pushes the material, so that the material is gradually gelatinized under function of the extrusion force and friction force. The second spiral blade 32 rapidly shears the material to cut the material into fine gel particles, which are heated by the steam sprayed from the screw hole, and are quickly gelatinized under function of the screw's extrusion and friction. The given gelatinization can be reached under the condition of high capacity at 5-7 segments.
In this embodiment, the through hole 33 is provided with multiple through holes which are arranged in an array on the front segment of the rod body along the conveying direction of the material. The length of the rod body with through holes is 1/3-1/2 of the entire operating segment. The high-pressure steam flowing into the hollow structure of the screw is sprayed out from the through hole at high speed during the screw-operating periods to quickly and efficiently gelatinize starch-based materials in combination with the forces at front segment such as extrusion and friction.
In this embodiment, the discharging opening 22 is an inverted U-shaped tube, and the length of the inverted U-shaped tube in the heating cavity is 1/3-1/2 of the inverted U-shaped tube, so as to further gelatinize and preserve heat. The remaining inverted U-shaped outlet is exposed to the air to quickly cool down and help to increase the viscosity of starch-based gel, which is conducive to subsequent extrusion moulding.
In the embodiment, the steam pressure delivered from the steam source is 0.4-0.7Mpa. The temperature of the heating cavity 1 is controlled at 135-160°C by controlling the high-pressure steam pressure, and every doubling the production capacity from 60-960kg/h increases the steam pressure by 0.1Mpa, which improves the gelatinization efficiency by 10-20 times compared with the same extrusion device.
The practice has shown that the extrusion gelatinization device of this embodiment has the advantages such as reasonable structure, high extrusion strength, long service life, stable performance, uniform gelatinization and high productivity.
9
BL-5232 : Embodiment2: 3858 An extrusion gelatinization system provided by this embodiment includes a rotation driving mechanism 5, a steam source and an extrusion gelatinization device according to the Embodiment 1.
The rotation driving mechanism is in transmission connection with the driving segment of the screw 3, and is used to drive the screw to rotate. In the embodiment, the rotation driving mechanism may include a motor and a gear deceleration transmission mechanism. The motor is put in the transmission connection with the input gear of the gear deceleration transmission mechanism, and then the driving segment is put in transmission connection with the output gear of the gear deceleration transmission mechanism, therefore, the screw 3 can be driven to rotate when the motor is started.
The steam source is in dynamic sealing communication with the driving segment, and is used to deliver steam to the inner cavity of the screw 3. Specially, the driving segment is connected to an external steam source through a pipe, and the driving segment is in dynamic sealing connection with the pipe, so that the screw can rotate relative to the steam connection pipe and ensure the steam not to leak.
The steam source is further connected to the steam inlet of the heating cavity 1, and is used to deliver high-pressure steam into the heating cavity 1. A steam pressure gauge 6 is installed on the pipe connecting the steam source and the heating cavity 1.
Comparative Example: The commonly used single-screw extrusion gelatinization device (Device A) and the extrusion gelatinization device (Device B) of Embodiment 1 are used to extrude and gelatinize starch-based material to achieve gelatinization under the same capacity with the same size of both extrusion cavity for comparison. The comparison experiment process is as follows: A) The main motor of extrusion gelatinization device in the prior art is SOKW, the diameter of screw is 100mm, and the length diameter ratio of screw is 13:1.
The material formula is: rice flour (75%), corn starch (5%), acetic acid esterified starch (10%), after passing through an 80-mesh sieve, the materials are first mixed, and added with water to concoct them to 46%. The material enters the extrusion gelatinization device to gelatinize. The gelatinization capacity is set to 60kg/h, 120kg/h, 240kg/h, 480kg/h and 960kg/h,
BL-5232 and the gelatinization is measured after extrusion gelatinization 222 B) The main motor of the extrusion gelatinization device in the Example 1 is S0kW, the average diameter of screw is 100 mm, and the length of the screw is consistent with the Experiment A. The material is fed from the feeding opening, and the high-pressure steam pressure in the steam interlayer of the heating cavity 1 outside the extrusion cavity is 0.5Mpa, and other conditions are consistent with the Experiment A. The experimental results are shown in Table 1: Table 1 Comparison of gelatinization between Device A and Device B under the same capacity
ET EE sample [+191 # [wo [wo It can be seen from the results that the device according to the invention for rapidly extruding and gelatinizing starch-based material can gelatinize starch-based samples more effectively than the traditional extrusion gelatinization device. Under the condition of lower production capacity, both extrusion gelatinization devices can completely gelatinize the raw materials. When the production capacity increases, the gelatinization of the samples produced by the traditional extrusion gelatinization device is drastically reduced, while the extrusion gelatinization device according to the invention still has very high gelatinization when the capacity reaches 960kg/h.
It can be understood that the above embodiments are merely exemplary embodiments used to illustrate the principle of the invention, but the invention is not limited thereto. For a skilled person in the art, various modifications and improvements can be made without departing from the principle and essence of the invention, and these modifications and improvements are also deemed to be within the protection scope of the invention.
11
Claims (10)
1. An extrusion gelatinization device comprising: a heating cavity (1), an extrusion cavity (2) and a screw (3), wherein said heating cavity (1) has a steam inlet and a steam outlet, said extrusion cavity (2) is located in said heating cavity (1), and has a feeding opening (21) and a discharging opening (22), both of which extend out of said heating cavity (1), said screw (3) has a hollow structure and can rotate in a circumferential direction, and includes a driving segment and an operating segment, said operating segment is located in said extrusion cavity (2), used for matching with the cavity wall of said extrusion cavity (2) when said screw (3) rotates, so as to extrude and gelatinize material while conveying the material from the feeding opening (21) to the discharging opening (22), said driving segment extends out of said extrusion cavity (2) and has an opening on its end for leading to an external steam source and connecting with an external rotation driving mechanism, said operating segment is provided with a through hole (33) for steam to escape into said extrusion cavity (2).
2. The extrusion gelatinization device according to claim 1, wherein the operating segment of said screw (3) includes a rod body and a spiral blade, said spiral blade is provided on the outer wall of the rod body and includes a first spiral blade and a second spiral blade, the first spiral blade has an extrusion spiral structure, which is used for conveying materials while said screw (3) rotates and extruding the materials to help to gelatinize the materials, the first spiral blade includes a plurality of first spiral blade segments (31) distributed on the rod body, the second spiral blade has a blade spiral structure, which is used for conveying materials while said screw (3) rotates and shearing the materials to help to gelatinize the materials, the second spiral blade includes a plurality of second spiral blade segments (32) distributed on the rod body, a plurality of first spiral blade segments (31) and a plurality of second spiral blade segments (32) are alternately arranged on the rod body along the conveying direction of the material.
3. The extrusion gelatinization device according to claim 2, wherein the outer diameter of the rod body of said screw (3) increases along the conveying direction of the material, and the distance between the crest of the spiral blade and the inner wall of the extrusion cavity (2) is consistent along the conveying direction of the material.
12
BL-5232
4. The extrusion gelatinization device according to claim 3, wherein the pitch of screw and profile height of said first spiral blade are sequentially decreased along the conveying direction of the material.
5. The extrusion gelatinization device according to claim 3, wherein the pitch of screw and profile height of said second spiral blade are sequentially decreased along the conveying direction of the material.
6. The extrusion gelatinization device according to any one of claims 2-5,wherein the head of the first spiral blade segment (31) is provided on the most front segment of the rod body along the conveying direction of the material, and the corresponding rod body length is 1/5 - 1/4 of the entire operating segment.
7. The extrusion gelatinization device according to any one of claims 2-5,wherein said through hole (33) is provided with multiple through holes (33) which are arranged in an array on the front segment of the rod body along the conveying direction of the material, the length of the rod body with through holes (33) is 1/3-1/2 of the entire operating segment.
8. The extrusion gelatinization device according to any one of claims 1-5,wherein said discharging opening (22) is an inverted U-shaped tube, and the length of said inverted U-shaped tube in the heating cavity (1) is 1/3-1/2 of the inverted U-shaped tube.
9. An extrusion gelatinization system comprising: a rotation driving mechanism, a steam source and said extrusion gelatinization device according to any one of claims1-8, wherein said rotation driving mechanism is in transmission connection with said driving segment, and is used to drive said screw (3) to rotate, said steam source is in dynamic sealing communication with said driving segment, and is used to deliver steam to the inner cavity of said screw (3), said steam source is further connected to the steam inlet of said heating cavity (1), and is used to deliver high-pressure steam into said heating cavity (1).
10. The extrusion gelatinization system according to claim 9, wherein said steam pressure delivered from the steam source is 0.4-0.7Mpa.
13
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| CN115153075B (en) * | 2022-07-12 | 2023-02-28 | 欧麦香（福建）食品有限公司 | Energy rod forming equipment capable of adding lactic acid bacteria |
| CN118020972B (en) * | 2024-03-15 | 2024-09-10 | 广西壮族自治区产品质量检验研究院(广西壮族自治区纤维检验所、广西质量技术评价认证中心) | Dry rice flour production device and method |
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| CN201426360Y (en) * | 2009-06-30 | 2010-03-24 | 江苏牧羊集团有限公司 | Extrusion processing device for bypass ripening |
| CN103238912B (en) * | 2013-05-20 | 2015-06-24 | 牧羊有限公司 | Conditioner |
| CN107581931B (en) * | 2016-07-06 | 2020-11-27 | 广东美的生活电器制造有限公司 | Extrusion screw, extrusion subassembly and food processor |
| CN206182324U (en) * | 2016-08-30 | 2017-05-24 | 北京慧农生物科技有限公司 | Extrusion device |
| CN208247241U (en) * | 2018-04-24 | 2018-12-18 | 南京昊翔机械制造有限公司 | The extrusion equipment of high-crosslinking-degree PE waste material |
| CN212545492U (en) * | 2020-05-11 | 2021-02-19 | 扬州科晟机械有限公司 | 360-degree steam inlet conditioner |
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