CN109838998B - Medium-low wind temperature three-layer roller progressive drying device - Google Patents
Medium-low wind temperature three-layer roller progressive drying device Download PDFInfo
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- CN109838998B CN109838998B CN201910149947.1A CN201910149947A CN109838998B CN 109838998 B CN109838998 B CN 109838998B CN 201910149947 A CN201910149947 A CN 201910149947A CN 109838998 B CN109838998 B CN 109838998B
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- 238000001035 drying Methods 0.000 title claims abstract description 58
- 230000000750 progressive effect Effects 0.000 title claims description 12
- 239000000463 material Substances 0.000 claims abstract description 138
- 238000009423 ventilation Methods 0.000 claims abstract description 41
- 230000000903 blocking effect Effects 0.000 claims abstract description 35
- 239000002912 waste gas Substances 0.000 abstract 1
- 239000010902 straw Substances 0.000 description 12
- 125000004122 cyclic group Chemical group 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002028 Biomass Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 229940088594 vitamin Drugs 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
- 235000013343 vitamin Nutrition 0.000 description 1
- 239000011782 vitamin Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a step-by-step drying device with a three-layer roller at medium and low air temperature, which consists of two parts, namely a drying roller and a material channel, wherein the drying roller is respectively provided with an outer-layer roller, a middle-layer roller and an inner-layer roller from outside to inside, and the left side and the right side of the drying roller are respectively provided with a first material channel and a second material channel. A first annular material baffle, a second annular ventilation baffle net and a third annular material baffle are arranged in the first material channel; and a first annular ventilation blocking net, a second annular material baffle and a third annular ventilation blocking net are arranged in the second material channel. The invention is characterized in that: the drying device is suitable for the medium-low temperature drying process, small in occupied space area and long in contact time, can fully utilize the heat of a drying medium to improve the drying efficiency, avoids potential safety hazards caused by high-temperature drying, and reduces the pollution of drying waste gas to the environment.
Description
Technical Field
The invention relates to the technical field of crop and straw drying machinery, in particular to a step-by-step drying device with a three-layer roller at medium and low wind temperature.
Background
The method has the advantages that a large amount of plant straws and other attachments can be generated after crops are harvested, a large land area can be occupied, the traditional treatment mode is that straws are directly burnt, along with vigorous support of governments and continuous development of biomass fuel utilization technologies, the straws are stored and become the most effective method for treating the straw and other attachments, and the current situation of national energy shortage can be improved. The main problem in biomass straw energy regeneration is to control the water content of the straw so as to facilitate straw granulation and prevent the environment pollution caused by too high water content of flue gas. Therefore, the straw needs to be dried before being pelletized.
The traditional drying roller mostly adopts a high-temperature drying form, materials are not dried fully due to short retention time, and are dried excessively due to too long retention time, so that the problems of high energy consumption, large energy loss and the like occur, the original characteristics of color, fragrance, taste, vitamins and the like of some agricultural products are difficult to ensure in the drying process of the agricultural products, and the quality of the agricultural products is seriously influenced. In the straw drying process, the present stoving straw adopts the cylinder drying-machine more, when the material volume of drying is very much, needs bulky equipment to operate, therefore area is big, still there is the difference in temperature of material in the equipment, the wet poor distributes unreasonablely, can not make full use of heat and dry, and simultaneously, the straw is not only drying efficiency low under too high drying temperature, takes place the pyrolysis moreover easily, gasify even burning, has great potential safety hazard to the life of producing.
Disclosure of Invention
The invention aims to provide a step-by-step drying device with a medium-low air temperature three-layer roller, which is used for solving the problems in the prior art, ensures that the temperature difference and the humidity difference between materials and a drying medium are reasonably distributed, is suitable for medium-low temperature drying, can improve the drying efficiency, saves energy and protects the environment.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a medium-low wind temperature three-layer roller step-by-step drying device which comprises a first material channel and a second material channel, wherein an outer layer roller is connected between the first material channel and the second material channel, a first annular material baffle connected with the outer layer roller is installed in the first material channel, a first star-shaped rotor impeller is installed at the bottom of the first material channel, the first star-shaped rotor impeller is positioned on the first annular material baffle, and a material outlet is communicated with the first material channel positioned below the first star-shaped rotor impeller; an air inlet is formed below the second material channel; the outer layer roller is sequentially sleeved with a middle layer roller and an inner layer roller; a second annular material baffle connected with the middle layer roller is installed in the second material channel, a second star-shaped rotor impeller is installed at the bottom of the second annular material baffle, a third annular material baffle connected with the inner layer roller is installed in the first material channel, and a third star-shaped rotor impeller is installed at the bottom of the third annular material baffle; a main driving shaft is arranged in the inner layer roller and is respectively connected with the first star-shaped rotor impeller, the second star-shaped rotor impeller and the third star-shaped rotor impeller through rotating rods; an air outlet channel connected with the inner layer roller is arranged on the outer side of the first material channel, the air outlet channel is connected with an air outlet, a material inlet channel connected with the inner layer roller is arranged on the outer side of the second material channel, and a material inlet is arranged above the material inlet channel; the outer layer roller is externally connected with a driving gear ring, and the driving gear ring is connected with a variable frequency motor; one end of the driving main shaft is connected with a driving motor.
Optionally, an annular air inlet buffer cavity is arranged on the outer side of the second material channel, and the air inlet is formed in the annular air inlet buffer cavity.
Optionally, a first annular ventilation retainer ring corresponding to the outer layer roller is arranged on the outer side of the second annular material baffle; a second annular ventilation check ring corresponding to the middle layer roller is arranged on the outer side of the third annular material baffle; and a third annular ventilation check ring is arranged between the feed inlet channel and the inner layer roller.
Optionally, a first exhaust vent blocking net is arranged between the exhaust vent channel and the inner layer roller.
Optionally, the inner diameter of the air outlet is smaller than the inner diameter of the air outlet channel; a reducing air outlet blocking net is arranged between the air outlet and the air outlet channel.
Optionally, a fourth star-shaped rotor impeller is arranged between the feed inlet and the feed inlet channel, and the fourth star-shaped rotor impeller is connected with the main driving shaft through a rotating rod.
Optionally, one end of the middle layer roller, which is close to the second material channel, is lower than one end of the middle layer roller, which is close to the first material channel; one end of the inner layer roller close to the first material channel is lower than one end of the inner layer roller close to the second material channel.
Optionally, a plurality of vent holes are uniformly formed in the annular surface of the first annular ventilation blocking net; the second annular ventilation blocking net and the third annular ventilation blocking net are the same as the first annular ventilation blocking net in structure.
Compared with the prior art, the invention has the following technical effects:
an annular air inlet buffer cavity is arranged between an air inlet and a first annular ventilation blocking net so as to balance air pressure at the inlet; the material and the air move in the same direction in each layer of the roller, and move in the opposite direction in the approximate reverse flow among the rollers, and finally the material is dried. The drying device is suitable for medium-low air temperature drying, makes full use of the heat of a drying medium, improves the energy utilization rate, ensures the quality of the dried materials, and reduces the environmental pollution.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural view of a low-air-temperature three-layer roller progressive drying device according to the present invention;
FIG. 2 is a sectional view of a low air temperature three-layer drum stepwise drying apparatus A-A according to the present invention;
FIG. 3 is a sectional view of a B-B low-air-temperature three-layer drum progressive drying device in the invention;
FIG. 4 is a schematic view of an annular ventilation screen of the low-wind-temperature three-layer roller progressive drying device of the present invention;
FIG. 5 is a schematic view of the material direction of the low air temperature three-layer roller progressive drying device in the invention;
FIG. 6 is a schematic view of the air flow direction of the low air temperature three-layer roller progressive drying device in the present invention;
description of reference numerals: 1-a first material channel; 2-a second material channel; 3-outer layer roller; 4-middle layer roller; 5-inner layer roller; 6-material outlet; 7-a first annular material baffle; 8-a first star-shaped rotor impeller; 9-a first annular ventilation screen; 10-annular air inlet buffer cavity; 11-an air inlet; 12-a second annular ventilation screen; 13-a second annular material baffle; 14-a second star-shaped rotor impeller; 15-a third annular material baffle; 16-a third star rotor impeller; 17-a first exhaust port blocking net; 18-air outlet channel; 19-an air outlet; 20-reducing air outlet blocking net; 21-a third annular ventilation screen; 22-a feedwell channel; 23-a feed inlet; 24-a fourth star rotor impeller; 25-a main drive shaft; 26-a drive motor; 27-a drive ring gear; 28-variable frequency motor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a step-by-step drying device with a medium-low air temperature three-layer roller, which is used for solving the problems in the prior art, ensures that the temperature difference and the humidity difference between materials and a drying medium are reasonably distributed, is suitable for medium-low temperature drying, can improve the drying efficiency, saves energy and protects the environment.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a medium-low wind temperature three-layer roller step-by-step drying device, which comprises a first material channel 1, a second material channel 2, an outer roller 3, a middle roller 4, an inner roller 5, a material outlet 6, a first annular material baffle 7, a first star-shaped rotor impeller 8, a first annular ventilation baffle net 9, an annular air inlet buffer cavity 10, an air inlet 11, a second annular ventilation baffle net 12, a second annular material baffle 13, a second star-shaped rotor impeller 14, a third annular material baffle 15, a third star-shaped rotor impeller 16, a first air outlet baffle net 17, an air outlet channel 18, an air outlet 19, a reducing air outlet baffle net 20, a third annular ventilation baffle net 21, a feed inlet channel 22, a feed inlet 23, a fourth star-shaped rotor impeller 24, a main driving shaft 25, a driving motor 26, a driving gear ring 27, a driving gear ring, A variable frequency motor 28.
Specifically, the upper left end of the outer layer roller 3 is connected with a point a of the first material channel 1, and the upper right end of the outer layer roller is connected with a point b of the second material channel 2; the left lower end is connected with a point k of the first material channel 1, and the right lower end is connected with a point m of the second material channel 2; a first annular material baffle 7 is arranged in the first material channel 1 and is connected with the left end of the outer layer roller 3, a material outlet 6 is arranged at the lower end of the first annular material baffle, and a first star-shaped rotor impeller 8 is arranged above the material outlet 6 and is connected with the outer layer roller 3 at a point k; a first annular ventilation blocking net 9 is arranged in the second material channel 2 and connected with the right end of the outer layer roller 3; an annular air inlet buffer cavity 10 is arranged outside the first annular ventilation blocking net 9; the lower end of the annular air inlet buffer cavity 10 is provided with an air inlet 11; the upper left end of the middle layer roller 4 is connected with a point c of the first material channel 1, and the upper right end of the middle layer roller is connected with a point d of the second material channel 2; the left lower end is connected with the point i of the first material channel 1, and the right lower end is connected with the point j of the second material channel 2; the left end of the middle layer roller 4 is provided with a second annular ventilation blocking net 12 inside the first material channel 1, and the left end of the second annular ventilation blocking net 12 and the inner wall of the first material channel 1 are fixed at n points; a second annular material baffle 13 is arranged at the right end of the middle layer roller 4, and a second star-shaped rotor impeller 14 is arranged at the lower end of the second annular material baffle 13 and connected with the j point of the middle layer roller 4; the upper left end of the inner layer roller 5 is connected with a point e of the first material channel 1, and the upper right end of the inner layer roller is connected with a point f of the second material channel 2; the left lower end is connected with the point g of the first material channel 1, and the right lower end is connected with the point h of the second material channel 2; a third annular material baffle 15 is arranged at the left end of the inner-layer roller 5 and is arranged inside the first material channel 1, and a third star-shaped rotor impeller 16 is arranged at the lower end of the third annular material baffle 15 and is connected with the inner-layer roller 5 at a point g; a first exhaust port blocking net 17 is arranged at the left end of the third annular material baffle 15, and the left side of the first exhaust port blocking net 17 is connected with an exhaust port channel 18 and fixed with the outer side of the first material channel 1; an air outlet 19 is arranged on the left side of the air outlet channel 18, and a reducing air outlet blocking net 20 is arranged between the air outlet channel 18 and the air outlet 19; a third annular ventilation blocking net 21 is arranged in the second material channel 2, the left end of the third annular ventilation blocking net is connected with the right end of the inner layer roller 5, and the right end of the third annular ventilation blocking net and the second material channel 2 are fixed at a point p; a feed inlet channel 22 is arranged at the right end of the third annular ventilation baffle net 21 and is fixed with the outer side of the second material channel 2; a feed inlet 23 is arranged at the right end of the feed inlet channel 22, a fourth star-shaped rotor impeller 24 is arranged at the lower part of the feed inlet 23 and is connected with a main driving shaft 25, and the main driving shaft 25 is connected with a driving motor 26; the outer side of the outer drum 3 is provided with a driving gear ring 27 which is connected with a variable frequency motor 28.
Further preferably, a first annular material baffle 7 with a first star-shaped rotor impeller 8 connected with the outer layer roller 3, a second annular ventilation baffle net 12 connected with the middle layer roller 4 and a third annular material baffle 15 with a third star-shaped rotor impeller 16 connected with the inner layer roller 5 are arranged in the first material channel 1 in a layered mode.
The second material channel 2 is provided with a first annular ventilation baffle net 9 connected with the outer layer roller 3, a second annular material baffle plate 13 connected with the middle layer roller 4 and provided with a second star-shaped rotor impeller 14, and a third annular ventilation baffle net 21 connected with the inner layer roller 5 in a layered manner.
The right end of the outer layer roller 3 is provided with a first annular ventilation blocking net 9, the outside of the outer layer roller is provided with an annular air inlet buffer cavity 10, and the lower end of the annular air inlet buffer cavity 10 is provided with an air inlet 11. The left end of the third annular material baffle 15 is provided with a first exhaust port blocking net 17, the left side of the third annular material baffle is connected with an exhaust port channel 18, the left side of the exhaust port channel 18 is provided with an exhaust port 19, and a reducing exhaust port blocking net 20 is arranged between the exhaust port channel 18 and the exhaust port 19.
The working principle of the invention is as follows: the driving motor 26 is connected with the main driving shaft 25 and drives the first star-shaped rotor impeller 8, the second star-shaped rotor impeller 14, the third star-shaped rotor impeller 16 and the fourth star-shaped rotor impeller 24 to rotate through chains; the inverter motor 28 rotates the drum by driving the ring gear 27.
The material drying process when the invention is used is as follows: the material firstly enters the inner layer roller 5 from the feed inlet 23 under the rotation of the fourth star-shaped rotor impeller 24, and moves to the left end of the roller along with the rotation of the inner layer roller 5 through the feed inlet channel to finish the first-stage drying; the material falls into the middle layer roller 4 from the inner layer roller 5 under the rotation action of the third star-shaped rotor impeller 16 to be dried at the second stage. Similarly, the material falls into the outer layer roller 3 from the middle layer roller 4 under the rotation action of the second star-shaped rotor impeller 14 at the right end of the roller, and along with the rotation of the outer layer roller 3, the material starts to move leftwards so as to finish the third stage drying. Finally, the material rotated by the first star-shaped rotor impeller 8 leaves the drying drum along the material outlet 6.
The flow direction of the drying medium in the use process of the invention is as follows: low temperature air enters into cyclic annular air inlet buffer chamber 10 by air intake 11, keep off net 9 through first cyclic annular ventilation and get into outer cylinder 3 and the first contact drying of material, the air current keeps off net 12 through the cyclic annular ventilation of second and gets into middle level cylinder 4 and the contact drying that the material carried out the second stage by outer cylinder 3, and then keeps off net 21 through the cyclic annular ventilation of third and gets into inner cylinder 5 and carry out the contact drying of final stage with the material, keep off net 17 and reducing air exit through first exhaust outlet along 5 dry media of layer cylinder and keep off net 20 and discharge by air exit 19.
The invention arranges an annular air inlet buffer cavity 10 between an air inlet 11 and a first annular ventilation baffle net 9 so as to balance the air pressure at the inlet. The invention realizes the forward flow and the same direction movement of the materials and the air in each layer of the roller, and the reverse direction movement of approximate reverse flow between the rollers, and finally realizes the drying of the materials. The drying device is suitable for medium-low air temperature drying, makes full use of the heat of a drying medium, improves the energy utilization rate, ensures the quality of the dried materials, and reduces the environmental pollution.
The principle and the implementation of the present invention are explained by applying specific examples in the present invention, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention, wherein the above-mentioned terms "upper, lower, left and right" are only described for convenience of description in the view of the drawings of the specification, and are not intended to limit the technical solution of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. The utility model provides a well low wind temperature three-layer cylinder is drying device step by step which characterized in that: the material conveying device comprises a first material channel and a second material channel, wherein an outer layer roller is connected between the first material channel and the second material channel, a first annular material baffle plate connected with the outer layer roller is installed in the first material channel, a first star-shaped rotor impeller is installed at the bottom of the first material channel, the first star-shaped rotor impeller is positioned on the first annular material baffle plate, and a material outlet is communicated with the first material channel below the first star-shaped rotor impeller; an air inlet is formed below the second material channel; the outer layer roller is sequentially sleeved with a middle layer roller and an inner layer roller; a second annular material baffle connected with the middle layer roller is installed in the second material channel, a second star-shaped rotor impeller is installed at the bottom of the second annular material baffle, a third annular material baffle connected with the inner layer roller is installed in the first material channel, and a third star-shaped rotor impeller is installed at the bottom of the third annular material baffle; a main driving shaft is arranged in the inner layer roller and is respectively connected with the first star-shaped rotor impeller, the second star-shaped rotor impeller and the third star-shaped rotor impeller through rotating rods; an air outlet channel connected with the inner layer roller is arranged on the outer side of the first material channel, the air outlet channel is connected with an air outlet, a material inlet channel connected with the inner layer roller is arranged on the outer side of the second material channel, and a material inlet is arranged above the material inlet channel; the outer layer roller is externally connected with a driving gear ring, and the driving gear ring is connected with a variable frequency motor; one end of the main driving shaft is connected with a driving motor; an annular air inlet buffer cavity is arranged at the outer side of the second material channel, and the air inlet is arranged on the annular air inlet buffer cavity; a first annular ventilation blocking net corresponding to the outer layer roller is arranged on the outer side of the second annular material blocking plate; a second annular ventilation blocking net corresponding to the middle layer roller is arranged on the outer side of the third annular material blocking plate; and a third annular ventilation blocking net is arranged between the feed inlet channel and the inner layer roller.
2. The progressive drying device of the medium and low air temperature three-layer roller as claimed in claim 1, wherein: and a first exhaust port blocking net is arranged between the exhaust port channel and the inner layer roller.
3. The progressive drying device of the medium and low air temperature three-layer roller as claimed in claim 1, wherein: the inner diameter of the air outlet is smaller than that of the air outlet channel; a reducing air outlet blocking net is arranged between the air outlet and the air outlet channel.
4. The progressive drying device of the medium and low air temperature three-layer roller as claimed in claim 1, wherein: the feed inlet with be provided with fourth star rotor impeller between the feed inlet passageway, fourth star rotor impeller pass through the dwang with the main drive axle is connected.
5. The progressive drying device of the medium and low air temperature three-layer roller as claimed in claim 1, wherein: one end of the middle layer roller, which is close to the second material channel, is lower than one end of the middle layer roller, which is close to the first material channel; one end of the inner layer roller close to the first material channel is lower than one end of the inner layer roller close to the second material channel.
6. The progressive drying device of the medium and low air temperature three-layer roller as claimed in claim 1, wherein: a plurality of vent holes are uniformly formed in the annular surface of the first annular ventilation blocking net; the second annular ventilation blocking net and the third annular ventilation blocking net are the same as the first annular ventilation blocking net in structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910149947.1A CN109838998B (en) | 2019-02-28 | 2019-02-28 | Medium-low wind temperature three-layer roller progressive drying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910149947.1A CN109838998B (en) | 2019-02-28 | 2019-02-28 | Medium-low wind temperature three-layer roller progressive drying device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109838998A CN109838998A (en) | 2019-06-04 |
| CN109838998B true CN109838998B (en) | 2021-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910149947.1A Active CN109838998B (en) | 2019-02-28 | 2019-02-28 | Medium-low wind temperature three-layer roller progressive drying device |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110108105B (en) * | 2019-06-19 | 2023-12-12 | 烟台富慧农业科技有限公司 | Cylinder dryer and manufacturing method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201392079Y (en) * | 2009-04-22 | 2010-01-27 | 郑州市鼎力干燥设备有限公司 | Three-layer rotary drum drier |
| CN201697434U (en) * | 2009-12-08 | 2011-01-05 | 常州科迪干燥设备有限公司 | Multiloop rotary drum dryer |
| CN202532833U (en) * | 2012-01-13 | 2012-11-14 | 鹿泉市诚达机械有限公司 | Three-tube dryer |
| CN105058766B (en) * | 2015-07-28 | 2017-04-19 | 武汉新中德塑机股份有限公司 | Combined three-layer co-extrusion inner cold mold head |
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